Merge branch 'main' into nes

fix

.gitignore

@@ -1,6 +1,6 @@
 /target
 *.uf2
-abi_sys.h
+userlib_sys.h
 assets/gif/bad_apple.gif
 picolibc
 user-apps/gboy/Peanut-GB

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "picolibc"]
 	path = picolibc
 	url = https://github.com/picolibc/picolibc
-[submodule "user-apps/gboy/Peanut-GB"]
+[submodule "user_apps/gboy/Peanut-GB"]
-	path = user-apps/gboy/Peanut-GB
+	path = user_apps/gboy/Peanut-GB
 	url = https://github.com/deltabeard/Peanut-GB

Cargo.lock

@@ -12,27 +12,6 @@ dependencies = [
  "regex",
 ]
 
-[[package]]
-name = "abi"
-version = "0.1.0"
-dependencies = [
- "abi_sys",
- "embedded-graphics",
- "once_cell",
- "rand_core 0.9.3",
-]
-
-[[package]]
-name = "abi_sys"
-version = "0.1.0"
-dependencies = [
- "bitflags 2.10.0",
- "cbindgen",
- "defmt 0.3.100",
- "embedded-graphics",
- "strum",
-]
-
 [[package]]
 name = "ahash"
 version = "0.8.12"
@@ -131,6 +110,26 @@ version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
+[[package]]
+name = "bindgen"
+version = "0.71.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f58bf3d7db68cfbac37cfc485a8d711e87e064c3d0fe0435b92f7a407f9d6b3"
+dependencies = [
+ "bitflags 2.10.0",
+ "cexpr",
+ "clang-sys",
+ "itertools 0.10.5",
+ "log",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+ "syn 2.0.110",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.5.3"
@@ -243,9 +242,9 @@ checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 name = "calculator"
 version = "0.1.0"
 dependencies = [
- "abi",
  "embedded-graphics",
  "embedded-layout",
+ "userlib",
 ]
 
 [[package]]
@@ -267,12 +266,42 @@ dependencies = [
  "toml",
 ]
 
+[[package]]
+name = "cc"
+version = "1.2.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37521ac7aabe3d13122dc382493e20c9416f299d2ccd5b3a5340a2570cdeb0f3"
+dependencies = [
+ "find-msvc-tools",
+ "shlex",
+]
+
+[[package]]
+name = "cexpr"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "clang-sys"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b023947811758c97c59bf9d1c188fd619ad4718dcaa767947df1cadb14f39f4"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
 [[package]]
 name = "clap"
 version = "3.2.25"
@@ -377,9 +406,9 @@ checksum = "460fbee9c2c2f33933d720630a6a0bac33ba7053db5344fac858d4b8952d77d5"
 
 [[package]]
 name = "crypto-common"
-version = "0.1.6"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+checksum = "78c8292055d1c1df0cce5d180393dc8cce0abec0a7102adb6c7b1eef6016d60a"
 dependencies = [
  "generic-array",
  "typenum",
@@ -1098,6 +1127,12 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
 
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
+
 [[package]]
 name = "fixed"
 version = "1.29.0"
@@ -1230,16 +1265,27 @@ dependencies = [
 name = "gallery"
 version = "0.1.0"
 dependencies = [
- "abi",
  "embedded-graphics",
  "tinybmp",
+ "userlib",
+]
+
+[[package]]
+name = "gboy"
+version = "0.1.0"
+dependencies = [
+ "bindgen",
+ "cc",
+ "embedded-graphics",
+ "selection_ui",
+ "userlib",
 ]
 
 [[package]]
 name = "generic-array"
-version = "0.14.9"
+version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bb6743198531e02858aeaea5398fcc883e71851fcbcb5a2f773e2fb6cb1edf2"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
@@ -1272,12 +1318,18 @@ dependencies = [
 name = "gif"
 version = "0.1.0"
 dependencies = [
- "abi",
  "embedded-graphics",
  "selection_ui",
  "tinygif",
+ "userlib",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
+
 [[package]]
 name = "goblin"
 version = "0.10.3"
@@ -1450,7 +1502,6 @@ dependencies = [
 name = "kernel"
 version = "0.0.1"
 dependencies = [
- "abi_sys",
  "assign-resources",
  "bitflags 2.10.0",
  "bt-hci",
@@ -1493,6 +1544,7 @@ dependencies = [
  "strum",
  "talc",
  "trouble-host",
+ "userlib_sys",
 ]
 
 [[package]]
@@ -1570,6 +1622,16 @@ version = "0.2.177"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2874a2af47a2325c2001a6e6fad9b16a53b802102b528163885171cf92b15976"
 
+[[package]]
+name = "libloading"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7c4b02199fee7c5d21a5ae7d8cfa79a6ef5bb2fc834d6e9058e89c825efdc55"
+dependencies = [
+ "cfg-if",
+ "windows-link",
+]
+
 [[package]]
 name = "libredox"
 version = "0.1.10"
@@ -1625,6 +1687,12 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3c8dda44ff03a2f238717214da50f65d5a53b45cd213a7370424ffdb6fae815"
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "nb"
 version = "0.1.3"
@@ -1646,6 +1714,16 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "650eef8c711430f1a879fdd01d4745a7deea475becfb90269c06775983bbf086"
 
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1909,6 +1987,16 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
+[[package]]
+name = "prettyplease"
+version = "0.2.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff24dfcda44452b9816fff4cd4227e1bb73ff5a2f1bc1105aa92fb8565ce44d2"
+dependencies = [
+ "proc-macro2",
+ "syn 2.0.110",
+]
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -2098,6 +2186,12 @@ dependencies = [
  "crc-any",
 ]
 
+[[package]]
+name = "rustc-hash"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
+
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -2157,10 +2251,10 @@ checksum = "c1257cd4248b4132760d6524d6dda4e053bc648c9070b960929bf50cfb1e7add"
 name = "selection_ui"
 version = "0.1.0"
 dependencies = [
- "abi",
  "embedded-graphics",
  "embedded-layout",
  "embedded-text",
+ "userlib",
 ]
 
 [[package]]
@@ -2237,6 +2331,12 @@ dependencies = [
  "keccak",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "siphasher"
 version = "1.0.1"
@@ -2271,10 +2371,10 @@ dependencies = [
 name = "snake"
 version = "0.1.0"
 dependencies = [
- "abi",
  "embedded-graphics",
  "embedded-snake",
  "rand",
+ "userlib",
 ]
 
 [[package]]
@@ -2647,6 +2747,27 @@ dependencies = [
  "usbd-hid-descriptors",
 ]
 
+[[package]]
+name = "userlib"
+version = "0.1.0"
+dependencies = [
+ "embedded-graphics",
+ "once_cell",
+ "rand_core 0.9.3",
+ "userlib_sys",
+]
+
+[[package]]
+name = "userlib_sys"
+version = "0.1.0"
+dependencies = [
+ "bitflags 2.10.0",
+ "cbindgen",
+ "defmt 0.3.100",
+ "embedded-graphics",
+ "strum",
+]
+
 [[package]]
 name = "uuid"
 version = "1.18.1"
@@ -2758,11 +2879,11 @@ dependencies = [
 name = "wav_player"
 version = "0.1.0"
 dependencies = [
- "abi",
  "embedded-audio",
  "embedded-graphics",
  "rand",
  "selection_ui",
+ "userlib",
 ]
 
 [[package]]

Cargo.toml

@@ -2,14 +2,15 @@
 resolver = "3"
 members = [
   "kernel",
-  "abi_sys",
+  "userlib_sys",
-  "abi",
+  "userlib",
   "selection_ui",
-  "user-apps/calculator",
+  "user_apps/calculator",
-  "user-apps/snake",
+  "user_apps/snake",
-  "user-apps/gallery",
+  "user_apps/gallery",
-  "user-apps/gif",
+  "user_apps/gif",
-  "user-apps/wav_player",
+  "user_apps/wav_player",
+  "user_apps/gboy",
 ]
 
 [profile.release]

README.md

@@ -1,26 +1,27 @@
 # PicoCalc OS (Rust)
 
-A simple operating system for the **Clockwork PicoCalc**, written in Rust.  
+A simple kernel and applications for the **Clockwork PicoCalc**, written in Rust.  
-This project provides a minimal kernel, ABI, and user-space applications to experiment with OS development on constrained hardware.
+This project provides a minimal kernel, syscall table, and user-space applications to experiment with kernel development on constrained hardware.
 
 ## Status
 
 Basic synchronous applications are working great.  
-Current focus is on **expanding the ABI syscalls** and **fixing the MSC/USB-SCSI driver** to make application development easier and smoother.
+Current focus is on exanding applications and porting software, finding bugs in ffi, and making sure the kernel is as stable as possible.
 
 ## Project Structure
 
-- **`kernel/`** – The core OS kernel (task scheduling, drivers, memory, etc.)
+- **`kernel/`** – The core OS kernel
-- **`abi_sys/`** – Shared application binary interface definitions for kernel ↔ userspace (Repr "C")
+- **`userlib_sys/`** – C FFI bindings for kernel syscall
-- **`abi/`** – Rust focused ABI helpers and abstractions for easier development
+- **`userlib/`** – Rust wrapper on top of `userlib_sys` 
-- **`user-apps/`** – Collection of userspace programs (calculator, snake, etc.)
+- **`picolib/`** – Built with ```just newlib```, and provides libc symbols when linking with C libraries 
+- **`user-apps/`** – Collection of userspace programs (gif player, wav player, calculator, snake, etc.)
 
 ## Features
 
 - Minimal Rust-based kernel targeting the PicoCalc
-- Custom ABI for safe communication between kernel and applications
+- Custom ABI for *Mostly* safe communication between kernel and applications
 - Support for multiple user-space applications
-- Hardware drivers tailored for the PicoCalc
+- Hardware drivers tailored for the PicoCalc( Audio, Display, Keyboard, ans Storage )
 
 ## Getting Started
 

justfile

@@ -1,15 +1,17 @@
+target := "thumbv8m.main-none-eabihf"
+
 kernel-dev board:
-    cargo run --bin kernel --features {{board}}  --features fps
+    cargo run --bin kernel --features {{board}}  --features fps --features defmt
 kernel-release-probe board:
     cargo run --bin kernel --profile release --features {{board}} --features fps
 kernel-release board:
     cargo build --bin kernel --release --no-default-features --features {{board}}
-    elf2uf2-rs -d target/thumbv8m.main-none-eabihf/release/kernel
+    elf2uf2-rs -d target/{{target}}/release/kernel
 
 binary-args := "RUSTFLAGS=\"-C link-arg=-pie -C relocation-model=pic\""
 
 cbindgen:
-    cbindgen abi_sys --output abi_sys.h -q
+    cbindgen userlib_sys --output userlib_sys.h -q
 
 newlib:
     #!/bin/bash
@@ -40,9 +42,10 @@ userapps: cbindgen
     just userapp gallery
     just userapp gif
     just userapp wav_player
+    just userapp gboy
 
 copy-userapp app:
-    cp ./target/thumbv8m.main-none-eabihf/release-binary/{{app}} /run/media/$(whoami)/PICOCALC/{{app}}.bin
+    cp ./target/{{target}}/release-binary/{{app}} /run/media/$(whoami)/PICOCALC/{{app}}.bin
 
 copy-userapps:
     #!/bin/bash
@@ -52,6 +55,7 @@ copy-userapps:
     just copy-userapp gallery
     just copy-userapp gif
     just copy-userapp wav_player
+    just copy-userapp gboy
 
     DEV=$(lsblk -o LABEL,NAME -nr | awk -v L="PICOCALC" '$1==L {print "/dev/" $2}')
     udisksctl unmount -b "$DEV"

kernel/Cargo.toml

@@ -11,7 +11,7 @@ doctest = false
 bench = false
 
 [features]
-default = ["rp235x", "defmt"]
+default = ["rp235x"]
 pimoroni2w = ["rp235x", "psram"]
 # rp2040 = ["embassy-rp/rp2040"] # unsupported, ram too small for fb
 rp235x = ["embassy-rp/rp235xb"]
@@ -99,4 +99,4 @@ embedded-alloc = { version = "0.6.0", features = [
 ], optional = true }
 bumpalo = "3.19.0"
 
-abi_sys = { path = "../abi_sys" }
+userlib_sys = { path = "../userlib_sys" }

kernel/build.rs

@@ -14,7 +14,7 @@ use std::io::Write;
 use std::path::PathBuf;
 
 #[cfg(all(feature = "rp235x", not(feature = "pimoroni2w")))]
-const MEMORY: &'static [u8] = include_bytes!("rp2350.x");
+const MEMORY: &[u8] = include_bytes!("rp2350.x");
 #[cfg(feature = "pimoroni2w")]
 const MEMORY: &'static [u8] = include_bytes!("rp2350.x");
 

kernel/src/audio.rs

@@ -1,6 +1,6 @@
 use crate::Audio;
-use core::sync::atomic::{AtomicBool, Ordering};
+use core::sync::atomic::{AtomicBool, AtomicU32, Ordering};
-use embassy_futures::join::join;
+use embassy_futures::{join::join, yield_now};
 use embassy_rp::{
     Peri,
     clocks::clk_sys_freq,
@@ -15,33 +15,67 @@ use fixed::traits::ToFixed;
 
 pub const SAMPLE_RATE_HZ: u32 = 22_050;
 const AUDIO_BUFFER_SAMPLES: usize = 1024;
-const _: () = assert!(AUDIO_BUFFER_SAMPLES == abi_sys::AUDIO_BUFFER_SAMPLES);
+const _: () = assert!(AUDIO_BUFFER_SAMPLES == userlib_sys::AUDIO_BUFFER_SAMPLES);
+
+const SILENCE: u8 = u8::MAX / 2;
 
 // 8bit stereo interleaved PCM audio buffers
-pub static mut AUDIO_BUFFER: [u8; AUDIO_BUFFER_SAMPLES * 2] = [0; AUDIO_BUFFER_SAMPLES * 2];
+pub static mut AUDIO_BUFFER: [u8; AUDIO_BUFFER_SAMPLES * 2] = [SILENCE; AUDIO_BUFFER_SAMPLES * 2];
-static mut AUDIO_BUFFER_1: [u8; AUDIO_BUFFER_SAMPLES * 2] = [0; AUDIO_BUFFER_SAMPLES * 2];
+static mut AUDIO_BUFFER_1: [u8; AUDIO_BUFFER_SAMPLES * 2] = [SILENCE; AUDIO_BUFFER_SAMPLES * 2];
 
+// atomics for user applications to signal changes to audio buffers
 pub static AUDIO_BUFFER_READY: AtomicBool = AtomicBool::new(true);
+pub static AUDIO_BUFFER_WRITTEN: AtomicBool = AtomicBool::new(false);
+pub static AUDIO_BUFFER_SAMPLE_RATE: AtomicU32 = AtomicU32::new(SAMPLE_RATE_HZ);
+
+/// resets audio buffers after user applications are unloaded
+pub fn clear_audio_buffers() {
+    unsafe {
+        AUDIO_BUFFER.fill(SILENCE);
+        AUDIO_BUFFER_1.fill(SILENCE);
+    }
+}
 
 #[embassy_executor::task]
 pub async fn audio_handler(mut audio: Audio) {
-    const SILENCE_VALUE: u8 = u8::MAX / 2;
-
     let prg = PioPwmAudioProgram8Bit::new(&mut audio.pio);
     let mut pwm_pio_left =
         PioPwmAudio::new(audio.dma0, &mut audio.pio, audio.sm0, audio.left, &prg);
     let mut pwm_pio_right =
         PioPwmAudio::new(audio.dma1, &mut audio.pio, audio.sm1, audio.right, &prg);
 
-    loop {
+    // enable sms at the same time to ensure they are synced
-        write_samples(&mut pwm_pio_left, &mut pwm_pio_right, unsafe {
+    audio.pio.apply_sm_batch(|pio| {
-            &AUDIO_BUFFER_1
+        pio.set_enable(&mut pwm_pio_right.sm, true);
-        })
+        pio.set_enable(&mut pwm_pio_left.sm, true);
-        .await;
+    });
-        unsafe { &mut AUDIO_BUFFER_1 }.fill(SILENCE_VALUE);
 
-        unsafe { core::mem::swap(&mut AUDIO_BUFFER, &mut AUDIO_BUFFER_1) };
+    let mut sample_rate = SAMPLE_RATE_HZ;
+
+    loop {
+        unsafe {
+            let new_sample_rate = AUDIO_BUFFER_SAMPLE_RATE.load(Ordering::Acquire);
+            if new_sample_rate != sample_rate {
+                sample_rate = new_sample_rate;
+                pwm_pio_left.reconfigure(sample_rate);
+                pwm_pio_right.reconfigure(sample_rate);
+
+                // restart sms at the same time to ensure they are synced
+                audio.pio.apply_sm_batch(|pio| {
+                    pio.restart(&mut pwm_pio_right.sm);
+                    pio.restart(&mut pwm_pio_left.sm);
+                });
+            }
+
+            if AUDIO_BUFFER_WRITTEN.load(Ordering::Acquire) {
+                write_samples(&mut pwm_pio_left, &mut pwm_pio_right, &AUDIO_BUFFER_1).await;
+                AUDIO_BUFFER_1.fill(SILENCE);
+                core::mem::swap(&mut AUDIO_BUFFER, &mut AUDIO_BUFFER_1);
                 AUDIO_BUFFER_READY.store(true, Ordering::Release)
+            } else {
+                yield_now().await;
+            }
+        }
     }
 }
 
@@ -51,12 +85,13 @@ async fn write_samples<PIO: Instance>(
     buf: &[u8],
 ) {
     // pack two samples per word
-    let mut packed_buf_left: [u32; AUDIO_BUFFER_SAMPLES / 2] = [0; AUDIO_BUFFER_SAMPLES / 2];
+    static mut PACKED_BUF_L: [u32; AUDIO_BUFFER_SAMPLES / 2] = [0; AUDIO_BUFFER_SAMPLES / 2];
-    let mut packed_buf_right: [u32; AUDIO_BUFFER_SAMPLES / 2] = [0; AUDIO_BUFFER_SAMPLES / 2];
+    static mut PACKED_BUF_R: [u32; AUDIO_BUFFER_SAMPLES / 2] = [0; AUDIO_BUFFER_SAMPLES / 2];
 
-    for ((pl, pr), sample) in packed_buf_left
+    unsafe {
+        for ((pl, pr), sample) in PACKED_BUF_L
             .iter_mut()
-        .zip(packed_buf_right.iter_mut())
+            .zip(PACKED_BUF_R.iter_mut())
             .zip(buf.chunks(4))
         {
             *pl = pack_u8_samples(sample[0], sample[2]);
@@ -66,14 +101,15 @@ async fn write_samples<PIO: Instance>(
         let left_fut = left
             .sm
             .tx()
-        .dma_push(left.dma.reborrow(), &packed_buf_left, false);
+            .dma_push(left.dma.reborrow(), &PACKED_BUF_L, false);
 
         let right_fut = right
             .sm
             .tx()
-        .dma_push(right.dma.reborrow(), &packed_buf_right, false);
+            .dma_push(right.dma.reborrow(), &PACKED_BUF_R, false);
 
         join(left_fut, right_fut).await;
+    }
 }
 
 struct PioPwmAudioProgram8Bit<'d, PIO: Instance>(LoadedProgram<'d, PIO>);
@@ -81,17 +117,29 @@ struct PioPwmAudioProgram8Bit<'d, PIO: Instance>(LoadedProgram<'d, PIO>);
 /// Writes one sample to pwm as high and low time
 impl<'d, PIO: Instance> PioPwmAudioProgram8Bit<'d, PIO> {
     fn new(common: &mut Common<'d, PIO>) -> Self {
-        // only uses 16 bits top for high, bottom for low
+        // only uses 16 bits top for pwm high, bottom for pwm low
-        // allows two samples per word
+        // allows storing two samples per word
         let prg = pio_asm!(
-            "out x, 8", // pwm high time
+            ".side_set 1",
-            "out y, 8", // pwm low time
+
+            "set x, 0 side 1",
+            "set y, 0 side 0",
+            ".wrap_target",
+
+            "check:",
+            "pull ifempty noblock side 1", // gets new osr or loads 0 into x, gets second sample if osr not empty
+            "out x, 8 side 0", // pwm high time
+            "out y, 8 side 1", // pwm low time
+            "jmp x!=y play_sample side 0", // x & y are never equal unless osr was empty
+            "set x, 1 side 1",
+            "set y, 1 side 0",
+
+            "play_sample:"
             "loop_high:",
-            "set pins, 1",       // keep pin high
+            "jmp x-- loop_high side 1", // keep pwm high, decrement X until 0
-            "jmp x-- loop_high", // decrement X until 0
             "loop_low:",
-            "set pins, 0",      // keep pin low
+            "jmp y-- loop_low side 0", // keep pwm low, decrement Y until 0
-            "jmp y-- loop_low", // decrement Y until 0
+            ".wrap"
         );
 
         let prg = common.load_program(&prg.program);
@@ -106,6 +154,11 @@ struct PioPwmAudio<'d, PIO: Instance, const SM: usize> {
 }
 
 impl<'d, PIO: Instance, const SM: usize> PioPwmAudio<'d, PIO, SM> {
+    fn get_sm_divider(sample_rate: u32) -> u32 {
+        let target_clock = (u8::MAX as u32 + 1) * sample_rate;
+        clk_sys_freq() / target_clock
+    }
+
     fn new(
         dma: Peri<'d, impl Channel>,
         pio: &mut Common<'d, PIO>,
@@ -118,25 +171,27 @@ impl<'d, PIO: Instance, const SM: usize> PioPwmAudio<'d, PIO, SM> {
         sm.set_pin_dirs(Direction::Out, &[&pin]);
 
         let mut cfg = Config::default();
-        cfg.set_set_pins(&[&pin]);
         cfg.fifo_join = FifoJoin::TxOnly;
-        let mut shift_cfg = ShiftConfig::default();
+        let shift_cfg = ShiftConfig {
-        shift_cfg.auto_fill = true;
+            auto_fill: false,
+            ..Default::default()
+        };
         cfg.shift_out = shift_cfg;
-        cfg.use_program(&prg.0, &[]);
+        cfg.use_program(&prg.0, &[&pin]);
         sm.set_config(&cfg);
 
-        let target_clock = (u8::MAX as u32 + 1) * SAMPLE_RATE_HZ;
+        sm.set_clock_divider(Self::get_sm_divider(SAMPLE_RATE_HZ).to_fixed());
-        let divider = (clk_sys_freq() / (target_clock * 2)).to_fixed();
-        sm.set_clock_divider(divider);
-
-        sm.set_enable(true);
 
         Self {
             dma: dma.into(),
             sm,
         }
     }
+
+    fn reconfigure(&mut self, sample_rate: u32) {
+        self.sm
+            .set_clock_divider(Self::get_sm_divider(sample_rate).to_fixed());
+    }
 }
 
 /// packs two u8 samples into 32bit word

kernel/src/display.rs

@@ -1,5 +1,4 @@
 use crate::framebuffer::{self, AtomicFrameBuffer, FB_PAUSED};
-use core::alloc::{GlobalAlloc, Layout};
 use core::sync::atomic::Ordering;
 use embassy_futures::yield_now;
 use embassy_rp::{
@@ -9,17 +8,20 @@ use embassy_rp::{
     spi::{Async, Spi},
 };
 use embassy_time::Delay;
-use embedded_graphics::{draw_target::DrawTarget, pixelcolor::Rgb565, prelude::RgbColor};
 use embedded_hal_bus::spi::ExclusiveDevice;
 use st7365p_lcd::ST7365P;
 
 #[cfg(feature = "psram")]
 use crate::heap::HEAP;
+#[cfg(feature = "psram")]
+use core::alloc::{GlobalAlloc, Layout};
+#[cfg(feature = "psram")]
+use embedded_graphics::{draw_target::DrawTarget, pixelcolor::Rgb565, prelude::RgbColor};
 
 #[cfg(feature = "fps")]
 pub use framebuffer::fps::{FPS_CANVAS, FPS_COUNTER};
 
-type DISPLAY = ST7365P<
+type Display = ST7365P<
     ExclusiveDevice<Spi<'static, SPI1, Async>, Output<'static>, Delay>,
     Output<'static>,
     Output<'static>,
@@ -56,7 +58,7 @@ pub async fn init_display(
     cs: Peri<'static, PIN_13>,
     data: Peri<'static, PIN_14>,
     reset: Peri<'static, PIN_15>,
-) -> DISPLAY {
+) -> Display {
     init_fb();
 
     let spi_device = ExclusiveDevice::new(spi, Output::new(cs, Level::Low), Delay).unwrap();
@@ -84,7 +86,7 @@ pub async fn init_display(
 }
 
 #[embassy_executor::task]
-pub async fn display_handler(mut display: DISPLAY) {
+pub async fn display_handler(mut display: Display) {
     use embassy_time::{Instant, Timer};
 
     // Target ~60 Hz refresh (≈16.67 ms per frame)
@@ -111,7 +113,7 @@ pub async fn display_handler(mut display: DISPLAY) {
             }
         }
 
-        let elapsed = start.elapsed().as_millis() as u64;
+        let elapsed = start.elapsed().as_millis();
         if elapsed < FRAME_TIME_MS {
             Timer::after_millis(FRAME_TIME_MS - elapsed).await;
         } else {

kernel/src/elf.rs

@@ -1,8 +1,7 @@
 use crate::{
-    abi,
     storage::{File, SDCARD},
+    syscalls,
 };
-use abi_sys::{CallTable, EntryFn};
 use alloc::{vec, vec::Vec};
 use bumpalo::Bump;
 use core::ptr;
@@ -17,6 +16,7 @@ use goblin::{
     elf32::{header, reloc::Rel, section_header::SectionHeader, sym::Sym},
 };
 use strum::IntoEnumIterator;
+use userlib_sys::{EntryFn, SyscallTable};
 
 const ELF32_HDR_SIZE: usize = 52;
 
@@ -39,7 +39,7 @@ pub async unsafe fn load_binary(name: &ShortFileName) -> Option<(EntryFn, Bump)>
             let mut ph_buf = vec![0_u8; elf_header.e_phentsize as usize];
 
             let (total_size, min_vaddr, _max_vaddr) =
-                total_loadable_size(&mut file, &elf_header, &mut ph_buf);
+                total_loadable_size(&mut file, elf_header, &mut ph_buf);
 
             let bump = Bump::with_capacity(total_size);
             let base = bump.alloc_slice_fill_default::<u8>(total_size);
@@ -52,25 +52,22 @@ pub async unsafe fn load_binary(name: &ShortFileName) -> Option<(EntryFn, Bump)>
                 let ph = cast_phdr(&ph_buf);
 
                 let seg_offset = (ph.p_vaddr - min_vaddr) as usize;
-                let mut segment = &mut base[seg_offset..seg_offset + ph.p_memsz as usize];
+                let segment = &mut base[seg_offset..seg_offset + ph.p_memsz as usize];
 
                 if ph.p_type == PT_LOAD {
-                    load_segment(&mut file, &ph, &mut segment).unwrap();
+                    load_segment(&mut file, &ph, segment).unwrap();
                 }
             }
 
             for i in 0..elf_header.e_shnum {
                 let sh = read_section(&mut file, elf_header, i.into());
 
-                match sh.sh_type {
+                if sh.sh_type == SHT_REL {
-                    SHT_REL => {
                     apply_relocations(&sh, min_vaddr, base.as_mut_ptr(), &mut file).unwrap();
                 }
-                    _ => {}
-                }
             }
 
-            patch_abi(&elf_header, base.as_mut_ptr(), min_vaddr, &mut file).unwrap();
+            patch_syscalls(elf_header, base.as_mut_ptr(), min_vaddr, &mut file).unwrap();
 
             // entry pointer is base_ptr + (entry - min_vaddr)
             let entry_ptr: EntryFn = unsafe {
@@ -150,14 +147,14 @@ fn apply_relocations(
     Ok(())
 }
 
-fn patch_abi(
+fn patch_syscalls(
     elf_header: &Header,
     base: *mut u8,
     min_vaddr: u32,
     file: &mut File,
 ) -> Result<(), ()> {
     for i in 1..=elf_header.e_shnum {
-        let sh = read_section(file, &elf_header, i.into());
+        let sh = read_section(file, elf_header, i.into());
 
         // find the symbol table
         if sh.sh_type == SHT_SYMTAB {
@@ -172,7 +169,7 @@ fn patch_abi(
                     &symtab_buf[i * sh.sh_entsize as usize..(i + 1) * sh.sh_entsize as usize];
                 let sym = cast_sym(sym_bytes);
 
-                let str_sh = read_section(file, &elf_header, sh.sh_link);
+                let str_sh = read_section(file, elf_header, sh.sh_link);
 
                 let mut name = Vec::new();
                 file.seek_from_start(str_sh.sh_offset + sym.st_name)
@@ -188,30 +185,33 @@ fn patch_abi(
                 }
 
                 let symbol_name = core::str::from_utf8(&name).unwrap();
-                if symbol_name == "CALL_ABI_TABLE" {
+                if symbol_name == stringify!(SYS_CALL_TABLE) {
                     let table_base =
                         unsafe { base.add((sym.st_value as usize) - min_vaddr as usize) }
                             as *mut usize;
 
-                    for (idx, call) in CallTable::iter().enumerate() {
+                    for (idx, call) in SyscallTable::iter().enumerate() {
                         let ptr = match call {
-                            CallTable::Alloc => abi::alloc as usize,
+                            SyscallTable::Alloc => syscalls::alloc as usize,
-                            CallTable::Dealloc => abi::dealloc as usize,
+                            SyscallTable::Dealloc => syscalls::dealloc as usize,
-                            CallTable::PrintString => abi::print as usize,
+                            SyscallTable::PrintString => syscalls::print as usize,
-                            CallTable::SleepMs => abi::sleep as usize,
+                            SyscallTable::SleepMs => syscalls::sleep as usize,
-                            CallTable::GetMs => abi::get_ms as usize,
+                            SyscallTable::GetMs => syscalls::get_ms as usize,
-                            CallTable::DrawIter => abi::draw_iter as usize,
+                            SyscallTable::DrawIter => syscalls::draw_iter as usize,
-                            CallTable::GetKey => abi::get_key as usize,
+                            SyscallTable::GetKey => syscalls::get_key as usize,
-                            CallTable::GenRand => abi::gen_rand as usize,
+                            SyscallTable::GenRand => syscalls::gen_rand as usize,
-                            CallTable::ListDir => abi::list_dir as usize,
+                            SyscallTable::ListDir => syscalls::list_dir as usize,
-                            CallTable::ReadFile => abi::read_file as usize,
+                            SyscallTable::ReadFile => syscalls::read_file as usize,
-                            CallTable::WriteFile => abi::write_file as usize,
+                            SyscallTable::WriteFile => syscalls::write_file as usize,
-                            CallTable::FileLen => abi::file_len as usize,
+                            SyscallTable::FileLen => syscalls::file_len as usize,
-                            CallTable::AudioBufferReady => abi::audio_buffer_ready as usize,
+                            SyscallTable::ReconfigureAudioSampleRate => {
-                            CallTable::SendAudioBuffer => abi::send_audio_buffer as usize,
+                                syscalls::reconfigure_audio_sample_rate as usize
+                            }
+                            SyscallTable::AudioBufferReady => syscalls::audio_buffer_ready as usize,
+                            SyscallTable::SendAudioBuffer => syscalls::send_audio_buffer as usize,
                         };
                         unsafe {
-                            table_base.add(idx as usize).write(ptr);
+                            table_base.add(idx).write(ptr);
                         }
                     }
                     return Ok(());
@@ -233,7 +233,7 @@ fn total_loadable_size(
         file.seek_from_start(elf_header.e_phoff + (elf_header.e_phentsize * i) as u32)
             .unwrap();
         file.read(ph_buf).unwrap();
-        let ph = cast_phdr(&ph_buf);
+        let ph = cast_phdr(ph_buf);
 
         if ph.p_type == PT_LOAD {
             if ph.p_vaddr < min_vaddr {

kernel/src/framebuffer.rs

@@ -46,7 +46,7 @@ impl<'a> AtomicFrameBuffer<'a> {
     }
 
     fn mark_tiles_dirty(&mut self, rect: Rectangle) {
-        let tiles_x = (SCREEN_WIDTH + TILE_SIZE - 1) / TILE_SIZE;
+        let tiles_x = SCREEN_WIDTH.div_ceil(TILE_SIZE);
         let start_tx = (rect.top_left.x as usize) / TILE_SIZE;
         let end_tx = ((rect.top_left.x + rect.size.width as i32 - 1) as usize) / TILE_SIZE;
         let start_ty = (rect.top_left.y as usize) / TILE_SIZE;
@@ -261,14 +261,15 @@ impl<'a> AtomicFrameBuffer<'a> {
                 // Check for dirty tile
                 if self.dirty_tiles[row_start_idx + col].swap(false, Ordering::Acquire) {
                     let run_start = col;
+                    let mut scan_col = col;
                     let mut run_len = 1;
 
                     // Extend run while contiguous dirty tiles and within MAX_BATCH_TILES
-                    while col + 1 < NUM_TILE_COLS
+                    while scan_col + 1 < NUM_TILE_COLS
                         && self.dirty_tiles[row_start_idx + col + 1].load(Ordering::Acquire)
                         && run_len < MAX_BATCH_TILES
                     {
-                        col += 1;
+                        scan_col += 1;
                         run_len += 1;
                     }
 
@@ -293,6 +294,8 @@ impl<'a> AtomicFrameBuffer<'a> {
                             &self.batch_tile_buf[..run_len * TILE_SIZE * TILE_SIZE],
                         )
                         .await?;
+
+                    col = scan_col;
                 }
 
                 col += 1;
@@ -346,11 +349,9 @@ impl<'a> DrawTarget for AtomicFrameBuffer<'a> {
             }
         }
 
-        if changed {
+        if changed && let Some(rect) = dirty_rect {
-            if let Some(rect) = dirty_rect {
             self.mark_tiles_dirty(rect);
         }
-        }
 
         Ok(())
     }
@@ -402,7 +403,7 @@ impl<'a> DrawTarget for AtomicFrameBuffer<'a> {
     fn fill_solid(&mut self, area: &Rectangle, color: Self::Color) -> Result<(), Self::Error> {
         self.fill_contiguous(
             area,
-            core::iter::repeat(color).take((self.size().width * self.size().height) as usize),
+            core::iter::repeat_n(color, (self.size().width * self.size().height) as usize),
         )
     }
 
@@ -412,8 +413,10 @@ impl<'a> DrawTarget for AtomicFrameBuffer<'a> {
             0,
             self.size().width as u16 - 1,
             self.size().height as u16 - 1,
-            core::iter::repeat(RawU16::from(color).into_inner())
+            core::iter::repeat_n(
-                .take((self.size().width * self.size().height) as usize),
+                RawU16::from(color).into_inner(),
+                (self.size().width * self.size().height) as usize,
+            ),
         )?;
 
         for tile in self.dirty_tiles.iter() {

kernel/src/heap.rs

@@ -22,8 +22,8 @@ impl Region {
 
     fn contains(&self, address: usize) -> bool {
         let start = self.start.load(Ordering::Relaxed);
-        let end = self.start.load(Ordering::Relaxed);
+        let end = start + self.size.load(Ordering::Relaxed);
-        (start..start + end).contains(&address)
+        (start..end).contains(&address)
     }
 
     fn new(start: usize, size: usize) -> Self {

kernel/src/main.rs

@@ -8,15 +8,19 @@
 
 extern crate alloc;
 
-mod abi;
 mod audio;
 mod display;
 mod elf;
 mod framebuffer;
+// TODO: NEED TO UPDATE MCU TO TEST BATTERY READS
+#[allow(unused)]
 mod peripherals;
+#[allow(unused)]
 mod scsi;
 mod storage;
+mod syscalls;
 mod ui;
+#[allow(unused)]
 mod usb;
 mod utils;
 
@@ -28,21 +32,17 @@ mod heap;
 mod psram;
 
 #[cfg(feature = "psram")]
-use crate::{heap::HEAP, heap::init_qmi_psram_heap, psram::init_psram, psram::init_psram_qmi};
+use crate::{heap::init_qmi_psram_heap, psram::init_psram_qmi};
 
 use crate::{
-    abi::{KEY_CACHE, MS_SINCE_LAUNCH},
+    audio::{AUDIO_BUFFER_WRITTEN, audio_handler, clear_audio_buffers},
-    audio::audio_handler,
     display::{FRAMEBUFFER, display_handler, init_display},
-    peripherals::{
+    peripherals::{conf_peripherals, keyboard::read_keyboard_fifo},
-        conf_peripherals,
-        keyboard::{KeyState, read_keyboard_fifo},
-    },
     scsi::MSC_SHUTDOWN,
     storage::{SDCARD, SdCard},
+    syscalls::{KEY_CACHE, MS_SINCE_LAUNCH},
     ui::{SELECTIONS, clear_selection, ui_handler},
 };
-use abi_sys::EntryFn;
 use bumpalo::Bump;
 use core::sync::atomic::{AtomicBool, Ordering};
 use embassy_executor::{Executor, Spawner};
@@ -76,6 +76,7 @@ use embedded_hal_bus::spi::ExclusiveDevice;
 use embedded_sdmmc::SdCard as SdmmcSdCard;
 use static_cell::StaticCell;
 use talc::*;
+use userlib_sys::EntryFn;
 use {defmt_rtt as _, panic_probe as _};
 
 embassy_rp::bind_interrupts!(struct Irqs {
@@ -105,7 +106,7 @@ async fn watchdog_task(mut watchdog: Watchdog) {
             ResetReason::Forced => "forced",
             ResetReason::TimedOut => "timed out",
         };
-        #[cfg(feature = "debug")]
+        #[cfg(feature = "defmt")]
         defmt::error!("Watchdog reset reason: {}", _reason);
     }
 
@@ -225,6 +226,9 @@ async fn userland_task() {
 
         // enable kernel ui
         {
+            AUDIO_BUFFER_WRITTEN.store(false, Ordering::Release);
+            clear_audio_buffers();
+
             ENABLE_UI.store(true, Ordering::Release);
             UI_CHANGE.signal(());
             unsafe { FRAMEBUFFER.as_mut().unwrap().clear(Rgb565::BLACK).unwrap() };
@@ -324,7 +328,7 @@ async fn setup_display(display: Display, spawner: Spawner) {
 async fn setup_qmi_psram() {
     Timer::after_millis(250).await;
     let psram_qmi_size = init_psram_qmi(&embassy_rp::pac::QMI, &embassy_rp::pac::XIP_CTRL);
-    #[cfg(feature = "debug")]
+    #[cfg(feature = "defmt")]
     defmt::info!("size:  {}", psram_qmi_size);
     Timer::after_millis(100).await;
 
@@ -366,7 +370,7 @@ async fn kernel_task(
         .spawn(watchdog_task(Watchdog::new(watchdog)))
         .unwrap();
 
-    #[cfg(feature = "debug")]
+    #[cfg(feature = "defmt")]
     defmt::info!("Clock: {}", embassy_rp::clocks::clk_sys_freq());
 
     setup_mcu(mcu).await;

kernel/src/peripherals/keyboard.rs

@@ -1,5 +1,5 @@
 use crate::peripherals::PERIPHERAL_BUS;
-pub use abi_sys::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
+pub use userlib_sys::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
 
 const REG_ID_KEY: u8 = 0x04;
 const REG_ID_FIF: u8 = 0x09;

kernel/src/psram.rs

@@ -526,7 +526,7 @@ pub fn init_psram_qmi(
     let psram_size = detect_psram_qmi(qmi);
 
     if psram_size == 0 {
-        #[cfg(feature = "debug")]
+        #[cfg(feature = "defmt")]
         defmt::error!("qmi psram size 0");
         return 0;
     }

kernel/src/scsi/mod.rs

@@ -30,7 +30,7 @@ pub struct MassStorageClass<'d, D: Driver<'d>> {
     bulk_in: D::EndpointIn,
 }
 
-impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
+impl<'d, D: Driver<'d>> MassStorageClass<'d, D> {
     pub fn new(builder: &mut Builder<'d, D>, temp_sd: Option<SdCard>) -> Self {
         let mut function = builder.function(0x08, SUBCLASS_SCSI, 0x50); // Mass Storage class
         let mut interface = function.interface();
@@ -72,9 +72,10 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
 
     async fn handle_cbw(&mut self) {
         let mut cbw_buf = [0u8; 31];
-        if let Ok(n) = self.bulk_out.read(&mut cbw_buf).await {
+        if let Ok(n) = self.bulk_out.read(&mut cbw_buf).await
-            if n == 31 {
+            && n == 31
-                if let Some(cbw) = CommandBlockWrapper::parse(&cbw_buf[..n]) {
+            && let Some(cbw) = CommandBlockWrapper::parse(&cbw_buf[..n])
+        {
             // Take sdcard to increase speed
             if self.temp_sd.is_none() {
                 let mut guard = SDCARD.get().lock().await;
@@ -94,15 +95,13 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                 self.send_csw_fail(cbw.dCBWTag).await
             }
 
-                    if self.pending_eject {
+            if self.pending_eject
-                        if let ScsiCommand::Write { lba: _, len: _ } = command {
+                && let ScsiCommand::Write { lba: _, len: _ } = command
+            {
                 MSC_SHUTDOWN.signal(());
             }
         }
     }
-            }
-        }
-    }
 
     async fn handle_command(&mut self, command: ScsiCommand) -> Result<(), ()> {
         let mut response: Vec<u8, BULK_ENDPOINT_PACKET_SIZE> = Vec::new();
@@ -238,7 +237,7 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                 let block_size = SdCard::BLOCK_SIZE as u64;
                 let total_blocks = self.temp_sd.as_ref().unwrap().size() / block_size;
 
-                let last_lba = total_blocks.checked_sub(1).unwrap_or(0);
+                let last_lba = total_blocks.saturating_sub(1);
 
                 response.extend_from_slice(&(last_lba as u32).to_be_bytes())?;
                 response.extend_from_slice(&(block_size as u32).to_be_bytes())?;
@@ -249,7 +248,7 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                 let block_size = SdCard::BLOCK_SIZE as u64;
                 let total_blocks = self.temp_sd.as_ref().unwrap().size() / block_size;
 
-                let last_lba = total_blocks.checked_sub(1).unwrap_or(0);
+                let last_lba = total_blocks.saturating_sub(1);
 
                 response.extend_from_slice(&last_lba.to_be_bytes())?; // 8 bytes last LBA
                 response.extend_from_slice(&(block_size as u32).to_be_bytes())?; // 4 bytes block length
@@ -269,7 +268,7 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                         sdcard.read_blocks(block_buf, BlockIdx(idx as u32))?;
 
                         for block in &mut *block_buf {
-                            for chunk in block.contents.chunks(BULK_ENDPOINT_PACKET_SIZE.into()) {
+                            for chunk in block.contents.chunks(BULK_ENDPOINT_PACKET_SIZE) {
                                 self.bulk_in.write(chunk).await.map_err(|_| ())?;
                             }
                         }
@@ -281,7 +280,7 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                             .read_blocks(&mut block_buf[..blocks as usize], BlockIdx(idx as u32))?;
 
                         for block in &block_buf[..blocks as usize] {
-                            for chunk in block.contents.chunks(BULK_ENDPOINT_PACKET_SIZE.into()) {
+                            for chunk in block.contents.chunks(BULK_ENDPOINT_PACKET_SIZE) {
                                 self.bulk_in.write(chunk).await.map_err(|_| ())?;
                             }
                         }
@@ -301,8 +300,7 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                 while blocks > 0 {
                     if blocks >= block_buf.len() as u64 {
                         for block in block_buf.as_mut() {
-                            for chunk in block.contents.chunks_mut(BULK_ENDPOINT_PACKET_SIZE.into())
+                            for chunk in block.contents.chunks_mut(BULK_ENDPOINT_PACKET_SIZE) {
-                            {
                                 self.bulk_out.read(chunk).await.map_err(|_| ())?;
                             }
                         }
@@ -313,8 +311,7 @@ impl<'d, 's, D: Driver<'d>> MassStorageClass<'d, D> {
                         idx += block_buf.len() as u64;
                     } else {
                         for block in block_buf[..blocks as usize].as_mut() {
-                            for chunk in block.contents.chunks_mut(BULK_ENDPOINT_PACKET_SIZE.into())
+                            for chunk in block.contents.chunks_mut(BULK_ENDPOINT_PACKET_SIZE) {
-                            {
                                 self.bulk_out.read(chunk).await.map_err(|_| ())?;
                             }
                         }

kernel/src/scsi/scsi_types.rs

@@ -1,7 +1,7 @@
 use num_enum::TryFromPrimitive;
 
 /// THE CODE BELOW ORIGINATES FROM: https://github.com/apohrebniak/usbd-storage/blob/master/usbd-storage/src/subclass/scsi.rs
-
+///
 /// SCSI device subclass code
 pub const SUBCLASS_SCSI: u8 = 0x06; // SCSI Transparent command set
 
@@ -91,6 +91,7 @@ pub enum ScsiCommand {
     },
 }
 
+#[allow(clippy::enum_variant_names)]
 #[repr(u8)]
 #[derive(Copy, Clone, Debug, TryFromPrimitive)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]

kernel/src/storage.rs

@@ -9,8 +9,8 @@ use embassy_sync::mutex::Mutex;
 use embassy_time::Delay;
 use embedded_hal_bus::spi::ExclusiveDevice;
 use embedded_sdmmc::{
-    Block, BlockCount, BlockDevice, BlockIdx, Directory, SdCard as SdmmcSdCard, TimeSource,
+    Block, BlockDevice, BlockIdx, Directory, SdCard as SdmmcSdCard, TimeSource, Timestamp,
-    Timestamp, Volume, VolumeIdx, VolumeManager, sdcard::Error,
+    VolumeIdx, VolumeManager, sdcard::Error,
 };
 use embedded_sdmmc::{File as SdFile, LfnBuffer, Mode, ShortFileName};
 
@@ -21,7 +21,6 @@ pub const MAX_VOLUMES: usize = 1;
 type Device = ExclusiveDevice<Spi<'static, SPI0, Blocking>, Output<'static>, embassy_time::Delay>;
 type SD = SdmmcSdCard<Device, Delay>;
 type VolMgr = VolumeManager<SD, DummyTimeSource, MAX_DIRS, MAX_FILES, MAX_VOLUMES>;
-type Vol<'a> = Volume<'a, SD, DummyTimeSource, MAX_DIRS, MAX_FILES, MAX_VOLUMES>;
 pub type Dir<'a> = Directory<'a, SD, DummyTimeSource, MAX_DIRS, MAX_FILES, MAX_VOLUMES>;
 pub type File<'a> = SdFile<'a, SD, DummyTimeSource, MAX_DIRS, MAX_FILES, MAX_VOLUMES>;
 
@@ -43,7 +42,7 @@ pub struct FileName {
 
 impl PartialOrd for FileName {
     fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
-        Some(self.long_name.cmp(&other.long_name))
+        Some(self.cmp(other))
     }
 }
 
@@ -67,10 +66,7 @@ impl SdCard {
             DummyTimeSource {},
             5000,
         );
-        Self {
+        Self { det, volume_mgr }
-            det: det,
-            volume_mgr,
-        }
     }
 
     /// Returns true if an SD card is inserted.
@@ -90,17 +86,6 @@ impl SdCard {
         result
     }
 
-    pub fn num_blocks(&self) -> u32 {
-        let mut result = 0;
-
-        self.volume_mgr.device(|sd| {
-            result = sd.num_blocks().unwrap_or(BlockCount(0)).0;
-            DummyTimeSource {}
-        });
-
-        result
-    }
-
     pub fn read_blocks(&self, blocks: &mut [Block], start_block_idx: BlockIdx) -> Result<(), ()> {
         let mut res: Result<(), Error> = Ok(());
         self.volume_mgr.device(|sd| {

kernel/src/syscalls.rs

@@ -1,8 +1,3 @@
-use abi_sys::{
-    AUDIO_BUFFER_SAMPLES, AllocAbi, AudioBufferReady, CLayout, CPixel, DeallocAbi, DrawIterAbi,
-    FileLen, GenRand, GetMsAbi, ListDir, PrintAbi, ReadFile, RngRequest, SendAudioBuffer,
-    SleepMsAbi, WriteFile, keyboard::*,
-};
 use alloc::{string::ToString, vec::Vec};
 use core::{ffi::c_char, ptr, sync::atomic::Ordering};
 use embassy_rp::clocks::{RoscRng, clk_sys_freq};
@@ -10,6 +5,11 @@ use embassy_time::Instant;
 use embedded_graphics::draw_target::DrawTarget;
 use embedded_sdmmc::LfnBuffer;
 use heapless::spsc::Queue;
+use userlib_sys::{
+    AUDIO_BUFFER_SAMPLES, Alloc, AudioBufferReady, CLayout, CPixel, Dealloc, DrawIter, FileLen,
+    GenRand, GetMs, ListDir, Print, ReadFile, ReconfigureAudioSampleRate, RngRequest,
+    SendAudioBuffer, SleepMs, WriteFile, keyboard::*,
+};
 
 #[cfg(feature = "psram")]
 use crate::heap::HEAP;
@@ -18,13 +18,13 @@ use crate::heap::HEAP;
 use core::alloc::GlobalAlloc;
 
 use crate::{
-    audio::{AUDIO_BUFFER, AUDIO_BUFFER_READY},
+    audio::{AUDIO_BUFFER, AUDIO_BUFFER_READY, AUDIO_BUFFER_SAMPLE_RATE, AUDIO_BUFFER_WRITTEN},
     display::FRAMEBUFFER,
     framebuffer::FB_PAUSED,
     storage::{Dir, File, SDCARD},
 };
 
-const _: AllocAbi = alloc;
+const _: Alloc = alloc;
 pub extern "C" fn alloc(layout: CLayout) -> *mut u8 {
     // SAFETY: caller guarantees layout is valid
     unsafe {
@@ -35,12 +35,12 @@ pub extern "C" fn alloc(layout: CLayout) -> *mut u8 {
 
         #[cfg(not(feature = "psram"))]
         {
-            return alloc::alloc::alloc(layout.into());
+            alloc::alloc::alloc(layout.into())
         }
     }
 }
 
-const _: DeallocAbi = dealloc;
+const _: Dealloc = dealloc;
 pub extern "C" fn dealloc(ptr: *mut u8, layout: CLayout) {
     // SAFETY: caller guarantees ptr and layout are valid
     #[cfg(feature = "psram")]
@@ -54,7 +54,7 @@ pub extern "C" fn dealloc(ptr: *mut u8, layout: CLayout) {
     }
 }
 
-const _: PrintAbi = print;
+const _: Print = print;
 pub extern "C" fn print(ptr: *const u8, len: usize) {
     // SAFETY: caller guarantees `ptr` is valid for `len` bytes
     let slice = unsafe { core::slice::from_raw_parts(ptr, len) };
@@ -68,7 +68,7 @@ pub extern "C" fn print(ptr: *const u8, len: usize) {
     }
 }
 
-const _: SleepMsAbi = sleep;
+const _: SleepMs = sleep;
 pub extern "C" fn sleep(ms: u64) {
     let cycles_per_ms = clk_sys_freq() / 1000;
     let total_cycles = ms * cycles_per_ms as u64;
@@ -80,14 +80,14 @@ pub extern "C" fn sleep(ms: u64) {
 
 pub static mut MS_SINCE_LAUNCH: Option<Instant> = None;
 
-const _: GetMsAbi = get_ms;
+const _: GetMs = get_ms;
 pub extern "C" fn get_ms() -> u64 {
     Instant::now()
         .duration_since(unsafe { MS_SINCE_LAUNCH.unwrap() })
         .as_millis()
 }
 
-const _: DrawIterAbi = draw_iter;
+const _: DrawIter = draw_iter;
 pub extern "C" fn draw_iter(cpixels: *const CPixel, len: usize) {
     // SAFETY: caller guarantees `ptr` is valid for `len` bytes
     let cpixels = unsafe { core::slice::from_raw_parts(cpixels, len) };
@@ -101,7 +101,7 @@ pub extern "C" fn draw_iter(cpixels: *const CPixel, len: usize) {
 
 pub static mut KEY_CACHE: Queue<KeyEvent, 32> = Queue::new();
 
-const _: GetKeyAbi = get_key;
+const _: GetKey = get_key;
 pub extern "C" fn get_key() -> KeyEventC {
     if let Some(event) = unsafe { KEY_CACHE.dequeue() } {
         event.into()
@@ -134,7 +134,7 @@ unsafe fn copy_entry_to_user_buf(name: &[u8], dest: *mut c_char, max_str_len: us
     if !dest.is_null() {
         let len = name.len().min(max_str_len - 1);
         unsafe {
-            ptr::copy_nonoverlapping(name.as_ptr(), dest as *mut u8, len);
+            ptr::copy_nonoverlapping(name.as_ptr(), dest, len);
             *dest.add(len) = 0; // nul terminator
         }
     }
@@ -191,7 +191,7 @@ pub extern "C" fn list_dir(
 
     let mut wrote = 0;
     sd.access_root_dir(|root| {
-        if dirs[0] == "" && dirs.len() >= 2 {
+        if dirs[0].is_empty() && dirs.len() >= 2 {
             unsafe {
                 if dir == "/" {
                     wrote = get_dir_entries(&root, files, max_entry_str_len);
@@ -214,11 +214,11 @@ fn recurse_file<T>(
         let mut buf = LfnBuffer::new(&mut b);
         let mut short_name = None;
         dir.iterate_dir_lfn(&mut buf, |entry, name| {
-            if let Some(name) = name {
+            if let Some(name) = name
-                if name == dirs[0] || entry.name.to_string().as_str() == dirs[0] {
+                && (name == dirs[0] || entry.name.to_string().as_str() == dirs[0])
+            {
                 short_name = Some(entry.name.clone());
             }
-            }
         })
         .expect("Failed to iterate dir");
 
@@ -257,7 +257,7 @@ pub extern "C" fn read_file(
     }
 
     // SAFETY: caller guarantees `ptr` is valid for `len` bytes
-    let mut buf = unsafe { core::slice::from_raw_parts_mut(buf, buf_len) };
+    let buf = unsafe { core::slice::from_raw_parts_mut(buf, buf_len) };
 
     let mut read = 0;
 
@@ -267,7 +267,7 @@ pub extern "C" fn read_file(
         sd.access_root_dir(|root| {
             if let Ok(result) = recurse_file(&root, &components[1..count], |file| {
                 file.seek_from_start(start_from as u32).unwrap_or(());
-                file.read(&mut buf).unwrap()
+                file.read(buf).unwrap()
             }) {
                 read = result
             };
@@ -306,7 +306,7 @@ pub extern "C" fn write_file(
         sd.access_root_dir(|root| {
             recurse_file(&root, &components[1..count], |file| {
                 file.seek_from_start(start_from as u32).unwrap();
-                file.write(&buf).unwrap()
+                file.write(buf).unwrap()
             })
             .unwrap_or(())
         });
@@ -333,6 +333,11 @@ pub extern "C" fn file_len(str: *const u8, len: usize) -> usize {
     len as usize
 }
 
+const _: ReconfigureAudioSampleRate = reconfigure_audio_sample_rate;
+pub extern "C" fn reconfigure_audio_sample_rate(sample_rate: u32) {
+    AUDIO_BUFFER_SAMPLE_RATE.store(sample_rate, Ordering::Release);
+}
+
 const _: AudioBufferReady = audio_buffer_ready;
 pub extern "C" fn audio_buffer_ready() -> bool {
     AUDIO_BUFFER_READY.load(Ordering::Acquire)
@@ -343,11 +348,14 @@ pub extern "C" fn send_audio_buffer(ptr: *const u8, len: usize) {
     // SAFETY: caller guarantees `ptr` is valid for `len` bytes
     let buf = unsafe { core::slice::from_raw_parts(ptr, len) };
 
-    while !AUDIO_BUFFER_READY.load(Ordering::Acquire) {}
+    while !AUDIO_BUFFER_READY.load(Ordering::Acquire) {
+        core::hint::spin_loop();
+    }
 
     if buf.len() == AUDIO_BUFFER_SAMPLES * 2 {
         AUDIO_BUFFER_READY.store(false, Ordering::Release);
         unsafe { AUDIO_BUFFER.copy_from_slice(buf) };
+        AUDIO_BUFFER_WRITTEN.store(true, Ordering::Release);
     } else {
         #[cfg(feature = "defmt")]
         defmt::warn!(

kernel/src/ui.rs

@@ -2,7 +2,6 @@ use crate::{
     BINARY_CH, display::FRAMEBUFFER, elf::load_binary, framebuffer::FB_PAUSED,
     peripherals::keyboard, storage::FileName,
 };
-use abi_sys::keyboard::{KeyCode, KeyState};
 use alloc::{str::FromStr, string::String, vec::Vec};
 use core::sync::atomic::Ordering;
 use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, mutex::Mutex};
@@ -20,14 +19,16 @@ use embedded_layout::{
     prelude::*,
 };
 use embedded_text::TextBox;
+use userlib_sys::keyboard::{KeyCode, KeyState};
 
 pub static SELECTIONS: Mutex<CriticalSectionRawMutex, SelectionList> =
     Mutex::new(SelectionList::new());
 
 pub async fn ui_handler() {
     loop {
-        if let Some(event) = keyboard::read_keyboard_fifo().await {
+        if let Some(event) = keyboard::read_keyboard_fifo().await
-            if let KeyState::Pressed = event.state {
+            && let KeyState::Pressed = event.state
+        {
             match event.key {
                 KeyCode::Up => {
                     let mut selections = SELECTIONS.lock().await;
@@ -52,7 +53,6 @@ pub async fn ui_handler() {
                 _ => (),
             }
         }
-        }
 
         let changed = SELECTIONS.lock().await.changed;
         if changed {

selection_ui/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path = "../abi" }
+userlib = { path = "../userlib" }
 embedded-graphics = "0.8.1"
 embedded-layout = "0.4.2"
 embedded-text = "0.7.3"

selection_ui/src/lib.rs

@@ -2,25 +2,25 @@
 
 extern crate alloc;
 
-use abi::{
-    display::Display,
-    get_key,
-    keyboard::{KeyCode, KeyState},
-};
 use alloc::vec::Vec;
 use embedded_graphics::{
-    Drawable,
+    mono_font::{ascii::FONT_10X20, MonoTextStyle},
-    mono_font::{MonoTextStyle, ascii::FONT_10X20},
     pixelcolor::Rgb565,
     prelude::{Dimensions, DrawTarget, Point, Primitive, RgbColor},
     primitives::{PrimitiveStyle, Rectangle},
-    text::{Alignment, Text, renderer::TextRenderer},
+    text::{renderer::TextRenderer, Alignment, Text},
+    Drawable,
 };
 use embedded_layout::{
     align::{horizontal, vertical},
     layout::linear::{FixedMargin, LinearLayout},
     prelude::*,
 };
+use userlib::{
+    display::Display,
+    get_key,
+    keyboard::{KeyCode, KeyState},
+};
 
 #[derive(Debug)]
 pub enum SelectionUiError<DisplayError> {
@@ -51,16 +51,15 @@ impl<'a> SelectionUi<'a> {
         let selection;
         loop {
             let key = get_key();
-            if key.state == KeyState::Pressed {
+            if key.state == KeyState::Pressed
-                if let Some(s) = self.update(display, key.key)? {
+                && let Some(s) = self.update(display, key.key)? {
                     selection = Some(s);
                     display
                         .clear(Rgb565::BLACK)
-                        .map_err(|e| SelectionUiError::DisplayError(e))?;
+                        .map_err(SelectionUiError::DisplayError)?;
                     break;
                 }
         }
-        }
         Ok(selection)
     }
 
@@ -100,7 +99,7 @@ impl<'a> SelectionUi<'a> {
             Rectangle::new(bounds.top_left, bounds.size)
                 .into_styled(PrimitiveStyle::with_fill(Rgb565::BLACK))
                 .draw(display)
-                .map_err(|e| SelectionUiError::DisplayError(e))?;
+                .map_err(SelectionUiError::DisplayError)?;
         }
 
         let mut views: Vec<Text<MonoTextStyle<Rgb565>>> = Vec::new();
@@ -119,7 +118,7 @@ impl<'a> SelectionUi<'a> {
 
         layout
             .draw(display)
-            .map_err(|e| SelectionUiError::DisplayError(e))?;
+            .map_err(SelectionUiError::DisplayError)?;
 
         // draw selected box
         if let Some(selected_bounds) = layout.inner().get(self.selection) {
@@ -127,7 +126,7 @@ impl<'a> SelectionUi<'a> {
             Rectangle::new(selected_bounds.top_left, selected_bounds.size)
                 .into_styled(PrimitiveStyle::with_stroke(Rgb565::WHITE, 1))
                 .draw(display)
-                .map_err(|e| SelectionUiError::DisplayError(e))?;
+                .map_err(SelectionUiError::DisplayError)?;
 
             self.last_bounds = Some(selected_bounds);
         }
@@ -136,13 +135,19 @@ impl<'a> SelectionUi<'a> {
     }
 }
 
-pub fn draw_text_center<'a, S>(
+pub fn draw_text_center<S>(
     display: &mut Display,
-    text: &'a str,
+    text: &str,
     style: S,
 ) -> Result<Point, <Display as DrawTarget>::Error>
 where
     S: TextRenderer<Color = <Display as DrawTarget>::Color>,
 {
-    Text::with_alignment(text, Point::zero(), style, Alignment::Center).draw(display)
+    Text::with_alignment(
+        text,
+        display.bounding_box().center(),
+        style,
+        Alignment::Center,
+    )
+    .draw(display)
 }

user_apps/calculator/Cargo.toml

@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path = "../../abi" }
+userlib = { path = "../../userlib" }
 embedded-graphics = "0.8.1"
 embedded-layout = "0.4.2"

user_apps/calculator/src/main.rs

@@ -2,12 +2,6 @@
 #![no_main]
 
 extern crate alloc;
-use abi::{
-    display::Display,
-    get_key,
-    keyboard::{KeyCode, KeyState},
-    println,
-};
 use alloc::{format, string::String, vec, vec::Vec};
 use core::panic::PanicInfo;
 use embedded_graphics::{
@@ -25,6 +19,12 @@ use embedded_layout::{
     layout::linear::LinearLayout,
     prelude::Chain,
 };
+use userlib::{
+    display::Display,
+    get_key,
+    keyboard::{KeyCode, KeyState},
+    println,
+};
 
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
@@ -83,7 +83,7 @@ pub fn main() {
             .align_to(&display.bounding_box(), horizontal::Left, vertical::Center);
 
             let result = if let Ok(result) = evaluate(&input[input_min..]) {
-                &format!(" = {}", result)
+                &format!(" = {result}")
             } else {
                 " = Error"
             };

user_apps/gallery/Cargo.toml

@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path = "../../abi" }
+userlib = { path = "../../userlib" }
 embedded-graphics = "0.8.1"
 tinybmp = "0.6.0"

user_apps/gallery/src/main.rs

@@ -3,13 +3,6 @@
 #![allow(static_mut_refs)]
 
 extern crate alloc;
-use abi::{
-    display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
-    fs::{Entries, list_dir, read_file},
-    get_key,
-    keyboard::{KeyCode, KeyState},
-    println,
-};
 use alloc::{format, vec};
 use core::panic::PanicInfo;
 use embedded_graphics::{
@@ -17,6 +10,13 @@ use embedded_graphics::{
     pixelcolor::Rgb565, prelude::*, text::Text,
 };
 use tinybmp::Bmp;
+use userlib::{
+    display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
+    fs::{Entries, list_dir, read_file},
+    get_key,
+    keyboard::{KeyCode, KeyState},
+    println,
+};
 
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
@@ -51,9 +51,9 @@ pub fn main() {
 
         println!("file: {}", file);
         if file.extension().unwrap_or("") == "bmp" || file.extension().unwrap_or("") == "BMP" {
-            let file_path = format!("/images/{}", file);
+            let file_path = format!("/images/{file}");
 
-            let read = read_file(&file_path, 0, &mut &mut bmp_buf[..]);
+            let read = read_file(&file_path, 0, &mut bmp_buf[..]);
             if read > 0 {
                 let bmp = Bmp::from_slice(&bmp_buf).expect("failed to parse bmp");
 
@@ -74,7 +74,7 @@ pub fn main() {
 
                 let text_style = MonoTextStyle::new(&FONT_6X10, Rgb565::WHITE);
                 let text_y = y + bmp_h + 2; // 2px gap under image
-                Text::new(&file.base(), Point::new(cell_x + 2, text_y), text_style)
+                Text::new(file.base(), Point::new(cell_x + 2, text_y), text_style)
                     .draw(&mut display)
                     .unwrap();
 
@@ -85,11 +85,8 @@ pub fn main() {
 
     loop {
         let event = get_key();
-        if event.state != KeyState::Idle {
+        if event.state != KeyState::Idle && event.key == KeyCode::Esc {
-            match event.key {
+            return;
-                KeyCode::Esc => return,
-                _ => (),
         }
-        };
     }
 }

user_apps/gboy/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "gboy"
+version = "0.1.0"
+edition = "2024"
+
+[build-dependencies]
+bindgen = "0.71.0"
+cc = "1.2.44"
+
+[dependencies]
+userlib = { path = "../../userlib" }
+selection_ui = { path = "../../selection_ui" }
+embedded-graphics = "0.8.1"

user_apps/gboy/build.rs

@@ -0,0 +1,64 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    bindgen();
+
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("../memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rustc-link-arg-bins=-Tmemory.x");
+}
+
+fn bindgen() {
+    let bindings = bindgen::Builder::default()
+        .header("Peanut-GB/peanut_gb.h")
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+        .disable_nested_struct_naming()
+        .clang_arg("-I../../picolibc/newlib/libc/include/")
+        .clang_arg("-I../../picolibc/build/")
+        .use_core()
+        .generate()
+        .expect("Unable to generate bindings");
+
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+
+    cc::Build::new()
+        .define("PEANUT_GB_IS_LITTLE_ENDIAN", None)
+        .define("ENABLE_LCD", None)
+        .file("peanut_gb_stub.c")
+        .include("Peanut-GB")
+        // optimization flags
+        .flag("-Ofast")
+        .flag("-fdata-sections")
+        .flag("-ffunction-sections")
+        .flag("-mcpu=cortex-m33")
+        .flag("-mthumb")
+        .flag("-g0")
+        .compile("peanut_gb");
+
+    println!("cargo:rustc-link-search=Peanut-GB");
+    println!("cargo:rustc-link-lib=peanut_gb");
+}

user_apps/gboy/peanut_gb_stub.c

@@ -0,0 +1 @@
+#include <peanut_gb.h>

user_apps/gboy/src/main.rs

@@ -0,0 +1,206 @@
+#![no_std]
+#![no_main]
+#![allow(static_mut_refs)]
+
+extern crate alloc;
+use alloc::{vec, vec::Vec};
+use core::{cell::LazyCell, mem::MaybeUninit, panic::PanicInfo};
+use embedded_graphics::{
+    mono_font::{MonoTextStyle, ascii::FONT_6X10},
+    pixelcolor::Rgb565,
+    prelude::RgbColor,
+};
+use selection_ui::{SelectionUi, SelectionUiError, draw_text_center};
+use userlib::{
+    display::Display,
+    format,
+    fs::{Entries, file_len, list_dir, read_file, write_file},
+    get_key,
+    keyboard::{KeyCode, KeyState},
+    println,
+};
+
+mod peanut;
+use peanut::gb_run_frame;
+
+use crate::peanut::{
+    JOYPAD_A, JOYPAD_B, JOYPAD_DOWN, JOYPAD_LEFT, JOYPAD_RIGHT, JOYPAD_SELECT, JOYPAD_START,
+    JOYPAD_UP, gb_cart_ram_read, gb_cart_ram_write, gb_error, gb_get_rom_name, gb_get_save_size,
+    gb_init, gb_init_lcd, gb_reset, gb_rom_read, gb_s, lcd_draw_line,
+};
+
+static mut DISPLAY: LazyCell<Display> = LazyCell::new(|| Display::take().unwrap());
+
+const RAM_SIZE: usize = 32 * 1024; // largest ram size is 32k
+static mut RAM: [u8; RAM_SIZE] = [0; RAM_SIZE];
+
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    println!("user panic: {} @ {:?}", info.message(), info.location(),);
+    loop {}
+}
+
+#[unsafe(no_mangle)]
+pub extern "Rust" fn _start() {
+    main()
+}
+
+const GAME_PATH: &'static str = "/games/gameboy";
+
+static mut GAME_ROM: Option<Vec<u8>> = None;
+
+pub fn main() {
+    println!("Starting Gameboy app");
+
+    let mut entries = Entries::new();
+    list_dir(GAME_PATH, &mut entries);
+
+    let mut files = entries.entries();
+    files.retain(|e| {
+        let ext = e.extension().unwrap_or("");
+        ext == "gb" || ext == "GB"
+    });
+    let mut roms = files.iter().map(|e| e.full_name()).collect::<Vec<&str>>();
+    roms.sort();
+
+    let selection = {
+        let display = unsafe { &mut *DISPLAY };
+        let mut selection_ui = SelectionUi::new(&roms);
+        match selection_ui.run_selection_ui(display) {
+            Ok(maybe_sel) => maybe_sel,
+            Err(e) => match e {
+                SelectionUiError::SelectionListEmpty => {
+                    draw_text_center(
+                        display,
+                        &format!("No Roms were found in {}", GAME_PATH),
+                        MonoTextStyle::new(&FONT_6X10, Rgb565::RED),
+                    )
+                    .expect("Display Error");
+                    None
+                }
+                SelectionUiError::DisplayError(_) => panic!("Display Error"),
+            },
+        }
+    };
+
+    assert!(selection.is_some());
+
+    let file_name = format!("{}/{}", GAME_PATH, roms[selection.unwrap()]);
+    let size = file_len(&file_name);
+    unsafe { GAME_ROM = Some(vec![0_u8; size]) };
+    let read = read_file(&file_name, 0, unsafe { GAME_ROM.as_mut().unwrap() });
+    assert!(size == read);
+    println!("Rom size: {}", read);
+
+    let mut gb = MaybeUninit::<gb_s>::uninit();
+
+    let init_status = unsafe {
+        gb_init(
+            gb.as_mut_ptr(),
+            Some(gb_rom_read),
+            Some(gb_cart_ram_read),
+            Some(gb_cart_ram_write),
+            Some(gb_error),
+            core::ptr::null_mut(),
+        )
+    };
+    println!("gb init status: {}", init_status);
+
+    unsafe {
+        load_save(&mut gb.assume_init());
+    }
+
+    unsafe {
+        gb_init_lcd(gb.as_mut_ptr(), Some(lcd_draw_line));
+
+        // enable frame skip
+        // gb.assume_init().direct.set_frame_skip(!true); // active low
+    };
+
+    loop {
+        let event = get_key();
+        let button = match event.key {
+            KeyCode::Esc => {
+                unsafe { write_save(&mut gb.assume_init()) };
+                break;
+            }
+            KeyCode::Char('r') => {
+                unsafe { gb_reset(gb.as_mut_ptr()) };
+                continue;
+            }
+            KeyCode::Tab => JOYPAD_START as u8,
+            KeyCode::Del => JOYPAD_SELECT as u8,
+            KeyCode::Enter => JOYPAD_A as u8,
+            KeyCode::Backspace => JOYPAD_B as u8,
+            KeyCode::Up => JOYPAD_UP as u8,
+            KeyCode::Down => JOYPAD_DOWN as u8,
+            KeyCode::Left => JOYPAD_LEFT as u8,
+            KeyCode::Right => JOYPAD_RIGHT as u8,
+            _ => 0,
+        };
+
+        if button != 0 {
+            unsafe {
+                // bindgen incorrectly generates direct so manual manipulation is required :(
+                let direct_ptr = &mut gb.assume_init().direct as *mut _ as *mut u8;
+                let joypad_ptr = direct_ptr.add(2); // this is the joypad bitfield byte
+
+                if let KeyState::Pressed = event.state {
+                    *joypad_ptr &= !button;
+                } else if let KeyState::Released = event.state {
+                    *joypad_ptr |= button;
+                }
+
+                println!("joypad: {:b}", *joypad_ptr);
+            }
+        }
+
+        unsafe {
+            gb_run_frame(gb.as_mut_ptr());
+        }
+    }
+}
+
+unsafe fn load_save(gb: &mut gb_s) {
+    let mut buf = [0; 16];
+
+    unsafe {
+        gb_get_rom_name(gb, buf.as_mut_ptr());
+
+        let save_size = gb_get_save_size(gb);
+
+        if save_size > 0 {
+            read_file(
+                &format!(
+                    "{}/saves/{}.sav",
+                    GAME_PATH,
+                    str::from_utf8(&buf).expect("bad rom name")
+                ),
+                0,
+                &mut RAM,
+            );
+        }
+    }
+}
+
+unsafe fn write_save(gb: &mut gb_s) {
+    let mut buf = [0; 16];
+
+    unsafe {
+        gb_get_rom_name(gb, buf.as_mut_ptr());
+
+        let save_size = gb_get_save_size(gb);
+
+        if save_size > 0 {
+            write_file(
+                &format!(
+                    "{}/saves/{}.sav",
+                    GAME_PATH,
+                    str::from_utf8(&buf).expect("bad rom name")
+                ),
+                0,
+                &mut RAM,
+            );
+        }
+    }
+}

user_apps/gboy/src/peanut.rs

@@ -0,0 +1,102 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use crate::{DISPLAY, GAME_ROM, RAM};
+
+#[allow(unused)]
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+use embedded_graphics::{pixelcolor::Rgb565, prelude::Point, Drawable};
+use userlib::{display::Pixel565, println};
+
+pub const GBOY_WIDTH: usize = 160;
+pub const GBOY_HEIGHT: usize = 144;
+
+pub unsafe extern "C" fn gb_rom_read(_gb: *mut gb_s, addr: u32) -> u8 {
+    unsafe { GAME_ROM.as_ref().unwrap()[addr as usize] }
+}
+
+pub unsafe extern "C" fn gb_cart_ram_read(_gb: *mut gb_s, addr: u32) -> u8 {
+    unsafe { RAM[addr as usize] }
+}
+
+pub unsafe extern "C" fn gb_cart_ram_write(_gb: *mut gb_s, addr: u32, val: u8) {
+    unsafe { RAM[addr as usize] = val }
+}
+
+pub unsafe extern "C" fn gb_error(_gb: *mut gb_s, err: gb_error_e, addr: u16) {
+    let e = match err {
+        0 => "UNKNOWN ERROR",
+        1 => "INVALID OPCODE",
+        2 => "INVALID READ",
+        3 => "INVALID WRITE",
+        4 => "HALT FOREVER",
+        5 => "INVALID MAX",
+        _ => unreachable!(),
+    };
+
+    println!("PeanutGB error: {}, addr: {}", e, addr);
+}
+
+const NUM_PALETTES: usize = 3;
+const SHADES_PER_PALETTE: usize = 4;
+
+const PALETTES: [[Rgb565; SHADES_PER_PALETTE]; NUM_PALETTES] = [
+    [
+        Rgb565::new(8, 24, 32),
+        Rgb565::new(52, 104, 86),
+        Rgb565::new(136, 192, 112),
+        Rgb565::new(224, 248, 208),
+    ], // BG
+    [
+        Rgb565::new(8, 24, 32),
+        Rgb565::new(52, 104, 86),
+        Rgb565::new(136, 192, 112),
+        Rgb565::new(224, 248, 208),
+    ], // OBJ0
+    [
+        Rgb565::new(8, 24, 32),
+        Rgb565::new(52, 104, 86),
+        Rgb565::new(136, 192, 112),
+        Rgb565::new(224, 248, 208),
+    ], // OBJ1
+];
+
+pub unsafe extern "C" fn lcd_draw_line(_gb: *mut gb_s, pixels: *const u8, line: u8) {
+    if line < GBOY_HEIGHT as u8 {
+        let pixels = unsafe { core::slice::from_raw_parts(pixels, GBOY_WIDTH) };
+        let y = line as u16;
+
+        for (x, &p) in pixels.iter().enumerate() {
+            let palette_idx = ((p & 0xF0) >> 4) as usize;
+            let shade_idx = (p & 0x03) as usize;
+
+            let color = PALETTES
+                .get(palette_idx)
+                .and_then(|pal| pal.get(shade_idx))
+                .copied()
+                .unwrap_or(Rgb565::new(0, 0, 0));
+
+            // let sx = (x as u16) * 2;
+            // let sy = y * 2;
+
+            // draw_color(color, sx, sy);
+            // draw_color(color, sx + 1, sy);
+            // draw_color(color, sx, sy + 1);
+            // draw_color(color, sx + 1, sy + 1);
+            //
+            draw_color(color, x as u16, y as u16);
+        }
+    }
+}
+
+fn draw_color(color: Rgb565, x: u16, y: u16) {
+    let mut pixel = Pixel565::default();
+    pixel.0 = Point::new(x.into(), y.into());
+    pixel.1 = color;
+
+    unsafe {
+        pixel.draw(&mut *DISPLAY).unwrap();
+    }
+}

user_apps/gif/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path = "../../abi" }
+userlib = { path = "../../userlib" }
 selection_ui = { path = "../../selection_ui" }
 embedded-graphics = "0.8.1"
 tinygif = { git = "https://github.com/LegitCamper/tinygif" }

user_apps/gif/src/main.rs

@@ -2,13 +2,6 @@
 #![no_main]
 
 extern crate alloc;
-use abi::{
-    display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
-    fs::{Entries, file_len, list_dir, read_file},
-    get_key, get_ms,
-    keyboard::{KeyCode, KeyState},
-    println, sleep,
-};
 use alloc::{format, vec, vec::Vec};
 use core::panic::PanicInfo;
 use embedded_graphics::{
@@ -20,6 +13,13 @@ use embedded_graphics::{
 };
 use selection_ui::{SelectionUi, SelectionUiError, draw_text_center};
 use tinygif::Gif;
+use userlib::{
+    display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
+    fs::{Entries, file_len, list_dir, read_file},
+    get_key, get_ms,
+    keyboard::{KeyCode, KeyState},
+    println, sleep,
+};
 
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
@@ -44,7 +44,7 @@ pub fn main() {
     let mut gifs = files.iter().map(|e| e.full_name()).collect::<Vec<&str>>();
     gifs.sort();
 
-    let mut selection_ui = SelectionUi::new(&mut gifs);
+    let mut selection_ui = SelectionUi::new(&gifs);
     let selection = match selection_ui.run_selection_ui(&mut display) {
         Ok(maybe_sel) => maybe_sel,
         Err(e) => match e {
@@ -87,14 +87,9 @@ pub fn main() {
 
             if frame_num % 5 == 0 {
                 let event = get_key();
-                if event.state != KeyState::Idle {
+                if event.state != KeyState::Idle && event.key == KeyCode::Esc {
-                    match event.key {
-                        KeyCode::Esc => {
                     drop(buf);
                     return;
-                        }
-                        _ => (),
-                    };
                 };
             }
             sleep(((frame.delay_centis as u64) * 10).saturating_sub(start));

user_apps/snake/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path = "../../abi" }
+userlib = { path = "../../userlib" }
 embedded-graphics = "0.8.1"
 embedded-snake = { git = "https://github.com/LegitCamper/embedded-snake-rs" }
 rand = { version = "0.9.0", default-features = false }

user_apps/snake/src/main.rs

@@ -2,16 +2,16 @@
 #![no_main]
 
 extern crate alloc;
-use abi::{
+use core::panic::PanicInfo;
+use embedded_graphics::{pixelcolor::Rgb565, prelude::RgbColor};
+use embedded_snake::{Direction, SnakeGame};
+use userlib::{
     Rng,
     display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
     get_key,
     keyboard::{KeyCode, KeyState},
     println, sleep,
 };
-use core::panic::PanicInfo;
-use embedded_graphics::{pixelcolor::Rgb565, prelude::RgbColor};
-use embedded_snake::{Direction, SnakeGame};
 
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {

user_apps/wav_player/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path = "../../abi" }
+userlib = { path = "../../userlib" }
 selection_ui = { path = "../../selection_ui" }
 embedded-graphics = "0.8.1"
 rand = { version = "0.9.0", default-features = false }

user_apps/wav_player/src/main.rs

@@ -2,15 +2,6 @@
 #![no_main]
 
 extern crate alloc;
-use abi::{
-    audio::{AUDIO_BUFFER_LEN, audio_buffer_ready, send_audio_buffer},
-    display::Display,
-    format,
-    fs::{Entries, file_len, list_dir, read_file},
-    get_key,
-    keyboard::{KeyCode, KeyState},
-    println,
-};
 use alloc::{string::String, vec::Vec};
 use core::panic::PanicInfo;
 use embedded_audio::{AudioFile, PlatformFile, PlatformFileError, wav::Wav};
@@ -20,6 +11,15 @@ use embedded_graphics::{
     prelude::RgbColor,
 };
 use selection_ui::{SelectionUi, SelectionUiError, draw_text_center};
+use userlib::{
+    audio::{AUDIO_BUFFER_LEN, audio_buffer_ready, send_audio_buffer},
+    display::Display,
+    format,
+    fs::{Entries, file_len, list_dir, read_file},
+    get_key,
+    keyboard::{KeyCode, KeyState},
+    println,
+};
 
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
@@ -45,14 +45,14 @@ pub fn main() {
         let mut wavs = files.iter().map(|e| e.full_name()).collect::<Vec<&str>>();
         wavs.sort();
 
-        let mut selection_ui = SelectionUi::new(&mut wavs);
+        let mut selection_ui = SelectionUi::new(&wavs);
         let selection = match selection_ui.run_selection_ui(&mut display) {
             Ok(maybe_sel) => maybe_sel,
             Err(e) => match e {
                 SelectionUiError::SelectionListEmpty => {
                     draw_text_center(
                         &mut display,
-                        "No Wavs were found in /gifs",
+                        "No Wavs were found in /music",
                         MonoTextStyle::new(&FONT_6X10, Rgb565::RED),
                     )
                     .expect("Display Error");
@@ -64,8 +64,15 @@ pub fn main() {
 
         assert!(selection.is_some());
 
+        draw_text_center(
+            &mut display,
+            &format!("Now playing {}", wavs[selection.unwrap()]),
+            MonoTextStyle::new(&FONT_6X10, Rgb565::WHITE),
+        )
+        .expect("Display Error");
+
         let file_name = format!("/music/{}", wavs[selection.unwrap()]);
-        let file = File::new(String::from(file_name));
+        let file = File::new(file_name);
         let mut wav = Wav::new(file).unwrap();
         println!("sample rate: {}", wav.sample_rate());
         println!("channels: {:?}", wav.channels() as u8);
@@ -83,11 +90,8 @@ pub fn main() {
             }
 
             let event = get_key();
-            if event.state == KeyState::Released {
+            if event.state == KeyState::Released && event.key == KeyCode::Esc {
-                match event.key {
+                return;
-                    KeyCode::Esc => return,
-                    _ => (),
-                }
             }
         }
     }

userlib/Cargo.toml

@@ -1,10 +1,10 @@
 [package]
-name = "abi"
+name = "userlib"
 version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi_sys = { path = "../abi_sys" }
+userlib_sys = { path = "../userlib_sys" }
 embedded-graphics = "0.8.1"
 once_cell = { version = "1", default-features = false }
 rand_core = "0.9.3"

userlib/src/lib.rs

@@ -3,11 +3,11 @@
 
 extern crate alloc;
 
-use abi_sys::{RngRequest, keyboard::KeyEvent};
-pub use abi_sys::{keyboard, print};
 pub use alloc::format;
 use core::alloc::{GlobalAlloc, Layout};
 use rand_core::RngCore;
+use userlib_sys::{RngRequest, keyboard::KeyEvent};
+pub use userlib_sys::{keyboard, print};
 
 #[global_allocator]
 static ALLOC: Alloc = Alloc;
@@ -16,11 +16,11 @@ struct Alloc;
 
 unsafe impl GlobalAlloc for Alloc {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        abi_sys::alloc(layout.into())
+        userlib_sys::alloc(layout.into())
     }
 
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
-        abi_sys::dealloc(ptr, layout.into());
+        userlib_sys::dealloc(ptr, layout.into());
     }
 }
 
@@ -33,21 +33,20 @@ macro_rules! println {
 }
 
 pub fn sleep(ms: u64) {
-    abi_sys::sleep(ms);
+    userlib_sys::sleep(ms);
 }
 
 pub fn get_ms() -> u64 {
-    abi_sys::get_ms()
+    userlib_sys::get_ms()
 }
 
 pub fn get_key() -> KeyEvent {
-    abi_sys::keyboard::get_key().into()
+    userlib_sys::keyboard::get_key().into()
 }
 
 pub mod display {
     use core::sync::atomic::{AtomicBool, Ordering};
 
-    use abi_sys::CPixel;
     use embedded_graphics::{
         Pixel,
         geometry::{Dimensions, Point},
@@ -55,6 +54,7 @@ pub mod display {
         prelude::{DrawTarget, Size},
         primitives::Rectangle,
     };
+    use userlib_sys::CPixel;
 
     pub const SCREEN_WIDTH: usize = 320;
     pub const SCREEN_HEIGHT: usize = 320;
@@ -110,13 +110,13 @@ pub mod display {
                 count += 1;
 
                 if count == BUF_SIZE - 1 {
-                    abi_sys::draw_iter(unsafe { BUF.as_ptr() }, count);
+                    userlib_sys::draw_iter(unsafe { BUF.as_ptr() }, count);
                     count = 0;
                 }
             }
 
             if count > 0 {
-                abi_sys::draw_iter(unsafe { BUF.as_ptr() }, count);
+                userlib_sys::draw_iter(unsafe { BUF.as_ptr() }, count);
             }
 
             Ok(())
@@ -125,7 +125,7 @@ pub mod display {
 }
 
 fn gen_rand(req: &mut RngRequest) {
-    abi_sys::gen_rand(req);
+    userlib_sys::gen_rand(req);
 }
 
 pub struct Rng;
@@ -162,7 +162,7 @@ pub mod fs {
     use core::fmt::Display;
 
     pub fn read_file(file: &str, start_from: usize, buf: &mut [u8]) -> usize {
-        abi_sys::read_file(
+        userlib_sys::read_file(
             file.as_ptr(),
             file.len(),
             start_from,
@@ -172,7 +172,7 @@ pub mod fs {
     }
 
     pub fn write_file(file: &str, start_from: usize, buf: &[u8]) {
-        abi_sys::write_file(
+        userlib_sys::write_file(
             file.as_ptr(),
             file.len(),
             start_from,
@@ -228,6 +228,12 @@ pub mod fs {
     #[derive(Clone, Copy, Debug)]
     pub struct Entries([[u8; MAX_ENTRY_NAME_LEN]; MAX_ENTRIES]);
 
+    impl Default for Entries {
+        fn default() -> Self {
+            Self::new()
+        }
+    }
+
     impl Entries {
         pub fn new() -> Self {
             Self([[0; MAX_ENTRY_NAME_LEN]; MAX_ENTRIES])
@@ -254,7 +260,7 @@ pub mod fs {
     }
 
     pub fn list_dir(path: &str, entries: &mut Entries) -> usize {
-        abi_sys::list_dir(
+        userlib_sys::list_dir(
             path.as_ptr(),
             path.len(),
             entries.as_ptrs().as_mut_ptr(),
@@ -264,14 +270,14 @@ pub mod fs {
     }
 
     pub fn file_len(str: &str) -> usize {
-        abi_sys::file_len(str.as_ptr(), str.len())
+        userlib_sys::file_len(str.as_ptr(), str.len())
     }
 }
 
 pub mod audio {
-    pub use abi_sys::{AUDIO_BUFFER_LEN, AUDIO_BUFFER_SAMPLES, audio_buffer_ready};
+    pub use userlib_sys::{AUDIO_BUFFER_LEN, AUDIO_BUFFER_SAMPLES, audio_buffer_ready};
 
     pub fn send_audio_buffer(buf: &[u8]) {
-        abi_sys::send_audio_buffer(buf.as_ptr(), buf.len())
+        userlib_sys::send_audio_buffer(buf.as_ptr(), buf.len())
     }
 }

userlib_sys/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "abi_sys"
+name = "userlib_sys"
 version = "0.1.0"
 edition = "2024"
 

userlib_sys/src/lib.rs

@@ -12,12 +12,12 @@ use strum::{EnumCount, EnumIter};
 
 pub type EntryFn = fn();
 
-pub const ABI_CALL_TABLE_COUNT: usize = 14;
+pub const SYS_CALL_TABLE_COUNT: usize = 15;
-const _: () = assert!(ABI_CALL_TABLE_COUNT == CallTable::COUNT);
+const _: () = assert!(SYS_CALL_TABLE_COUNT == SyscallTable::COUNT);
 
 #[derive(Clone, Copy, EnumIter, EnumCount)]
 #[repr(u8)]
-pub enum CallTable {
+pub enum SyscallTable {
     Alloc = 0,
     Dealloc = 1,
     PrintString = 2,
@@ -30,13 +30,14 @@ pub enum CallTable {
     ReadFile = 9,
     WriteFile = 10,
     FileLen = 11,
-    AudioBufferReady = 12,
+    ReconfigureAudioSampleRate = 12,
-    SendAudioBuffer = 13,
+    AudioBufferReady = 13,
+    SendAudioBuffer = 14,
 }
 
 #[unsafe(no_mangle)]
 #[unsafe(link_section = ".syscall_table")]
-pub static mut CALL_ABI_TABLE: [usize; ABI_CALL_TABLE_COUNT] = [0; ABI_CALL_TABLE_COUNT];
+pub static mut SYS_CALL_TABLE: [usize; SYS_CALL_TABLE_COUNT] = [0; SYS_CALL_TABLE_COUNT];
 
 #[cfg(feature = "alloc")]
 #[repr(C)]
@@ -46,9 +47,9 @@ pub struct CLayout {
 }
 
 #[cfg(feature = "alloc")]
-impl Into<Layout> for CLayout {
+impl From<CLayout> for Layout {
-    fn into(self) -> Layout {
+    fn from(val: CLayout) -> Self {
-        unsafe { Layout::from_size_align_unchecked(self.size, self.alignment) }
+        unsafe { Layout::from_size_align_unchecked(val.size, val.alignment) }
     }
 }
 
@@ -62,51 +63,51 @@ impl From<Layout> for CLayout {
     }
 }
 
-pub type AllocAbi = extern "C" fn(layout: CLayout) -> *mut u8;
+pub type Alloc = extern "C" fn(layout: CLayout) -> *mut u8;
 
 #[unsafe(no_mangle)]
 pub extern "C" fn alloc(layout: CLayout) -> *mut u8 {
-    let f: AllocAbi = unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::Alloc as usize]) };
+    let f: Alloc = unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::Alloc as usize]) };
     f(layout)
 }
 
-pub type DeallocAbi = extern "C" fn(ptr: *mut u8, layout: CLayout);
+pub type Dealloc = extern "C" fn(ptr: *mut u8, layout: CLayout);
 
 #[unsafe(no_mangle)]
 pub extern "C" fn dealloc(ptr: *mut u8, layout: CLayout) {
-    let f: DeallocAbi =
+    let f: Dealloc =
-        unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::Dealloc as usize]) };
+        unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::Dealloc as usize]) };
     f(ptr, layout)
 }
 
-pub type PrintAbi = extern "C" fn(ptr: *const u8, len: usize);
+pub type Print = extern "C" fn(ptr: *const u8, len: usize);
 
 #[unsafe(no_mangle)]
 pub extern "C" fn print(ptr: *const u8, len: usize) {
-    let f: PrintAbi =
+    let f: Print =
-        unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::PrintString as usize]) };
+        unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::PrintString as usize]) };
     f(ptr, len);
 }
 
-pub type SleepMsAbi = extern "C" fn(ms: u64);
+pub type SleepMs = extern "C" fn(ms: u64);
 
 #[unsafe(no_mangle)]
 pub extern "C" fn sleep(ms: u64) {
-    let f: SleepMsAbi =
+    let f: SleepMs =
-        unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::SleepMs as usize]) };
+        unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::SleepMs as usize]) };
     f(ms);
 }
 
-pub type GetMsAbi = extern "C" fn() -> u64;
+pub type GetMs = extern "C" fn() -> u64;
 
 #[unsafe(no_mangle)]
 pub extern "C" fn get_ms() -> u64 {
-    let f: GetMsAbi = unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::GetMs as usize]) };
+    let f: GetMs = unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::GetMs as usize]) };
     f()
 }
 
 #[repr(C)]
-#[derive(Copy, Clone)]
+#[derive(Default, Copy, Clone)]
 pub struct CPixel {
     pub x: i32,
     pub y: i32,
@@ -123,33 +124,36 @@ impl CPixel {
     }
 }
 
-impl Into<CPixel> for Pixel<Rgb565> {
+impl From<CPixel> for Pixel<Rgb565> {
-    fn into(self) -> CPixel {
+    fn from(value: CPixel) -> Self {
+        Pixel(
+            Point::new(value.x, value.y),
+            RawU16::new(value.color).into(),
+        )
+    }
+}
+
+impl From<Pixel<Rgb565>> for CPixel {
+    fn from(value: Pixel<Rgb565>) -> Self {
         CPixel {
-            x: self.0.x,
+            x: value.0.x,
-            y: self.0.y,
+            y: value.0.y,
-            color: self.1.into_storage(),
+            color: value.1.into_storage(),
         }
     }
 }
 
-impl Into<Pixel<Rgb565>> for CPixel {
+pub type DrawIter = extern "C" fn(ptr: *const CPixel, len: usize);
-    fn into(self) -> Pixel<Rgb565> {
-        Pixel(Point::new(self.x, self.y), RawU16::new(self.color).into())
-    }
-}
-
-pub type DrawIterAbi = extern "C" fn(ptr: *const CPixel, len: usize);
 
 #[unsafe(no_mangle)]
 pub extern "C" fn draw_iter(ptr: *const CPixel, len: usize) {
-    let f: DrawIterAbi =
+    let f: DrawIter =
-        unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::DrawIter as usize]) };
+        unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::DrawIter as usize]) };
     f(ptr, len);
 }
 
 pub mod keyboard {
-    use crate::{CALL_ABI_TABLE, CallTable};
+    use crate::{SYS_CALL_TABLE, SyscallTable};
 
     bitflags::bitflags! {
         #[derive(Default, Debug, PartialEq, Eq, Clone, Copy)]
@@ -171,12 +175,12 @@ pub mod keyboard {
         pub mods: Modifiers,
     }
 
-    impl Into<KeyEvent> for KeyEventC {
+    impl From<KeyEventC> for KeyEvent {
-        fn into(self) -> KeyEvent {
+        fn from(val: KeyEventC) -> Self {
             KeyEvent {
-                key: self.key.into(),
+                key: val.key.into(),
-                state: self.state,
+                state: val.state,
-                mods: self.mods,
+                mods: val.mods,
             }
         }
     }
@@ -188,12 +192,12 @@ pub mod keyboard {
         pub mods: Modifiers,
     }
 
-    impl Into<KeyEventC> for KeyEvent {
+    impl From<KeyEvent> for KeyEventC {
-        fn into(self) -> KeyEventC {
+        fn from(val: KeyEvent) -> Self {
             KeyEventC {
-                key: self.key.into(),
+                key: val.key.into(),
-                state: self.state,
+                state: val.state,
-                mods: self.mods,
+                mods: val.mods,
             }
         }
     }
@@ -214,7 +218,7 @@ pub mod keyboard {
                 1 => KeyState::Pressed,
                 2 => KeyState::Hold,
                 3 => KeyState::Released,
-                0 | _ => KeyState::Idle,
+                _ => KeyState::Idle,
             }
         }
     }
@@ -267,9 +271,9 @@ pub mod keyboard {
         Unknown(u8),
     }
 
-    impl Into<u8> for KeyCode {
+    impl From<KeyCode> for u8 {
-        fn into(self) -> u8 {
+        fn from(val: KeyCode) -> Self {
-            match self {
+            match val {
                 KeyCode::JoyUp => 0x01,
                 KeyCode::JoyDown => 0x02,
                 KeyCode::JoyLeft => 0x03,
@@ -367,12 +371,12 @@ pub mod keyboard {
         }
     }
 
-    pub type GetKeyAbi = extern "C" fn() -> KeyEventC;
+    pub type GetKey = extern "C" fn() -> KeyEventC;
 
     #[unsafe(no_mangle)]
     pub extern "C" fn get_key() -> KeyEventC {
-        let f: GetKeyAbi =
+        let f: GetKey =
-            unsafe { core::mem::transmute(CALL_ABI_TABLE[CallTable::GetKey as usize]) };
+            unsafe { core::mem::transmute(SYS_CALL_TABLE[SyscallTable::GetKey as usize]) };
         f()
     }
 }
@@ -389,7 +393,7 @@ pub type GenRand = extern "C" fn(req: &mut RngRequest);
 #[unsafe(no_mangle)]
 pub extern "C" fn gen_rand(req: &mut RngRequest) {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::GenRand as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::GenRand as usize];
         let f: GenRand = core::mem::transmute(ptr);
         f(req)
     }
@@ -412,7 +416,7 @@ pub extern "C" fn list_dir(
     max_entry_str_len: usize,
 ) -> usize {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::ListDir as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::ListDir as usize];
         let f: ListDir = core::mem::transmute(ptr);
         f(str, len, entries, entry_count, max_entry_str_len)
     }
@@ -435,7 +439,7 @@ pub extern "C" fn read_file(
     buf_len: usize,
 ) -> usize {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::ReadFile as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::ReadFile as usize];
         let f: ReadFile = core::mem::transmute(ptr);
         f(str, len, read_from, buf, buf_len)
     }
@@ -453,7 +457,7 @@ pub extern "C" fn write_file(
     buf_len: usize,
 ) {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::WriteFile as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::WriteFile as usize];
         let f: WriteFile = core::mem::transmute(ptr);
         f(str, len, write_from, buf, buf_len)
     }
@@ -464,18 +468,29 @@ pub type FileLen = extern "C" fn(str: *const u8, len: usize) -> usize;
 #[unsafe(no_mangle)]
 pub extern "C" fn file_len(str: *const u8, len: usize) -> usize {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::FileLen as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::FileLen as usize];
         let f: FileLen = core::mem::transmute(ptr);
         f(str, len)
     }
 }
 
+pub type ReconfigureAudioSampleRate = extern "C" fn(sample_rate: u32);
+
+#[allow(unused)]
+pub fn reconfigure_audio_sample_rate(sample_rate: u32) {
+    unsafe {
+        let ptr = SYS_CALL_TABLE[SyscallTable::ReconfigureAudioSampleRate as usize];
+        let f: ReconfigureAudioSampleRate = core::mem::transmute(ptr);
+        f(sample_rate)
+    }
+}
+
 pub type AudioBufferReady = extern "C" fn() -> bool;
 
 #[allow(unused)]
 pub fn audio_buffer_ready() -> bool {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::AudioBufferReady as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::AudioBufferReady as usize];
         let f: AudioBufferReady = core::mem::transmute(ptr);
         f()
     }
@@ -489,7 +504,7 @@ pub type SendAudioBuffer = extern "C" fn(ptr: *const u8, len: usize);
 #[allow(unused)]
 pub fn send_audio_buffer(buf: *const u8, len: usize) {
     unsafe {
-        let ptr = CALL_ABI_TABLE[CallTable::SendAudioBuffer as usize];
+        let ptr = SYS_CALL_TABLE[SyscallTable::SendAudioBuffer as usize];
         let f: SendAudioBuffer = core::mem::transmute(ptr);
         f(buf, len)
     }