From 6a6172b254a024df74480bf98a96cd5f8dbb37d1 Mon Sep 17 00:00:00 2001
From: sawyer bristol <sawyerbristol@gmail.com>
Date: Wed, 18 Jun 2025 19:17:27 -0600
Subject: [PATCH] basic keyboard driver

---
 .cargo/config.toml  |    9 +
 .gitignore          |    1 +
 Cargo.lock          | 3299 +++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml          |   70 +
 Embed.toml          |   39 +
 build.rs            |   36 +
 memory.x            |   17 +
 rust-toolchain.toml |    4 +
 src/keyboard.rs     |  161 +++
 src/main.rs         |   41 +
 10 files changed, 3677 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 Embed.toml
 create mode 100644 build.rs
 create mode 100644 memory.x
 create mode 100644 rust-toolchain.toml
 create mode 100644 src/keyboard.rs
 create mode 100644 src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..3ced906
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,9 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip RP2040"
+# runner = "elf2uf2-rs -d"
+
+[build]
+target = "thumbv6m-none-eabi" # Cortex-M0 and Cortex-M0+
+
+[env]
+DEFMT_LOG = "info"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..3cf014c
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,3299 @@
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+ "windows_i686_gnullvm",
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+ "windows_x86_64_gnu",
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+ "zerofrom",
+ "zerovec-derive",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..3025722
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,70 @@
+[package]
+name = "picocalc-os-rs"
+version = "0.1.0"
+edition = "2024"
+
+[build-dependencies]
+reqwest = { version = "0.12.20", features = ["blocking"] }
+
+[features]
+default = ["rp2040"]
+rp2040 = ["embassy-rp/rp2040"]
+rp2350 = ["embassy-rp/_rp235x"]
+trouble = ["dep:bt-hci", "dep:cyw43", "dep:cyw43-pio", "dep:trouble-host"]
+defmt = [
+  "dep:defmt",
+  "panic-probe/print-defmt",
+  "embassy-executor/defmt",
+  "embassy-time/defmt",
+  "embassy-time/defmt-timestamp-uptime",
+  "embassy-rp/defmt",
+  "embassy-sync/defmt",
+  "embedded-graphics/defmt",
+  "embedded-sdmmc/defmt-log",
+  # "bt-hci/defmt",
+  # "cyw43/defmt",
+  # "cyw43-pio/defmt",
+]
+
+[dependencies]
+embassy-executor = { version = "0.7", features = [
+  "arch-cortex-m",
+  "executor-interrupt",
+  "executor-thread",
+  "nightly",
+] }
+embassy-rp = { version = "0.4.0", features = [
+  "critical-section-impl",
+  "time-driver",
+  "intrinsics",
+] }
+embassy-futures = "0.1.0"
+embassy-time = "0.4.0"
+embassy-embedded-hal = "0.3.0"
+embassy-sync = { version = "0.6" }
+trouble-host = { version = "0.1", features = [
+  "derive",
+  "scan",
+], optional = true }
+bt-hci = { version = "0.2", default-features = false, optional = true }
+cyw43 = { version = "0.3.0", features = [
+  "firmware-logs",
+  "bluetooth",
+], optional = true }
+cyw43-pio = { version = "0.3.0", optional = true }
+
+embedded-hal-bus = { version = "0.3.0", features = ["async"] }
+embedded-hal = "0.2.7"
+embedded-hal-async = "1.0.0"
+cortex-m = { version = "0.7.7" }
+cortex-m-rt = "0.7.5"
+panic-probe = "0.3"
+portable-atomic = { version = "1.11", features = ["critical-section"] }
+
+defmt = { version = "0.3", optional = true }
+defmt-rtt = "0.4.2"
+
+embedded-graphics = { version = "0.8.1" }
+embedded-sdmmc = { git = "https://github.com/Be-ing/embedded-sdmmc-rs", branch = "bisync", default-features = false }
+
+static_cell = "2.1.0"
diff --git a/Embed.toml b/Embed.toml
new file mode 100644
index 0000000..f818ac6
--- /dev/null
+++ b/Embed.toml
@@ -0,0 +1,39 @@
+[default.probe]
+protocol = "Swd"
+speed = 20000
+# If you only have one probe cargo embed will pick automatically
+# Otherwise: add your probe's VID/PID/serial to filter
+
+## rust-dap
+# usb_vid = "6666"
+# usb_pid = "4444"
+# serial = "test"
+
+
+[default.flashing]
+enabled = true
+
+[default.reset]
+enabled = true
+halt_afterwards = false
+
+[default.general]
+chip = "RP2040"
+log_level = "WARN"
+# RP2040 does not support connect_under_reset
+connect_under_reset = false
+
+[default.rtt]
+enabled = true
+up_mode = "NoBlockSkip"
+channels = [
+  { up = 0, down = 0, name = "name", up_mode = "NoBlockSkip", format = "Defmt" },
+]
+timeout = 3000
+show_timestamps = true
+log_enabled = false
+log_path = "./logs"
+
+[default.gdb]
+enabled = false
+gdb_connection_string = "127.0.0.1:2345"
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..3f915f9
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,36 @@
+//! 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() {
+    // 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());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}
diff --git a/memory.x b/memory.x
new file mode 100644
index 0000000..ef19dff
--- /dev/null
+++ b/memory.x
@@ -0,0 +1,17 @@
+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+
+    /* Pick one of the two options for RAM layout     */
+
+    /* OPTION A: Use all RAM banks as one big block   */
+    /* Reasonable, unless you are doing something     */
+    /* really particular with DMA or other concurrent */
+    /* access that would benefit from striping        */
+    RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+
+    /* OPTION B: Keep the unstriped sections separate */
+    /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+    /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+    /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..54ee2f2
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly-2025-06-18"
+components = ["rust-src", "rustfmt", "rust-lld"]
+targets = ["thumbv6m-none-eabi"]
diff --git a/src/keyboard.rs b/src/keyboard.rs
new file mode 100644
index 0000000..875e8b9
--- /dev/null
+++ b/src/keyboard.rs
@@ -0,0 +1,161 @@
+use embassy_rp::{
+    i2c::{Async, I2c},
+    peripherals::I2C1,
+};
+use embassy_sync::{blocking_mutex::raw::NoopRawMutex, channel::Sender};
+
+const KEYBOARD_ADDR: u8 = 0x1F;
+
+pub struct KeyEvent {
+    key: KeyCode,
+    state: KeyState,
+}
+
+#[embassy_executor::task]
+pub async fn keyboard(
+    mut i2c: I2c<'static, I2C1, Async>,
+    channel: Sender<'static, NoopRawMutex, KeyEvent, 10>,
+) {
+    embassy_time::Timer::after(embassy_time::Duration::from_millis(100)).await;
+
+    let mut res = [0_u8; 2];
+    if i2c.read_async(KEYBOARD_ADDR, &mut res).await.is_ok() {
+        if let Ok(state) = KeyState::try_from(res[0]) {
+            if let Ok(key) = KeyCode::try_from(res[1]) {
+                let _ = channel.try_send(KeyEvent { key, state });
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum KeyState {
+    Idle = 0,
+    Pressed,
+    Hold,
+    Released,
+}
+
+impl TryFrom<u8> for KeyState {
+    type Error = ();
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        match value {
+            0 => Ok(KeyState::Idle),
+            1 => Ok(KeyState::Pressed),
+            2 => Ok(KeyState::Hold),
+            3 => Ok(KeyState::Released),
+            _ => Err(()),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum KeyCode {
+    // Joystick
+    JoyUp = 0x01,
+    JoyDown = 0x02,
+    JoyLeft = 0x03,
+    JoyRight = 0x04,
+    JoyCenter = 0x05,
+
+    // Buttons
+    BtnLeft1 = 0x06,
+    BtnRight1 = 0x07,
+    BtnLeft2 = 0x11,
+    BtnRight2 = 0x12,
+
+    // Basic Keys
+    Backspace = 0x08,
+    Tab = 0x09,
+    Enter = 0x0A,
+
+    // Modifiers
+    ModAlt = 0xA1,
+    ModShiftLeft = 0xA2,
+    ModShiftRight = 0xA3,
+    ModSym = 0xA4,
+    ModCtrl = 0xA5,
+
+    // Navigation
+    Esc = 0xB1,
+    Left = 0xB4,
+    Up = 0xB5,
+    Down = 0xB6,
+    Right = 0xB7,
+
+    // Specials
+    Break = 0xD0,
+    Insert = 0xD1,
+    Home = 0xD2,
+    Del = 0xD4,
+    End = 0xD5,
+    PageUp = 0xD6,
+    PageDown = 0xD7,
+
+    // Locks
+    CapsLock = 0xC1,
+
+    // Function keys
+    F1 = 0x81,
+    F2 = 0x82,
+    F3 = 0x83,
+    F4 = 0x84,
+    F5 = 0x85,
+    F6 = 0x86,
+    F7 = 0x87,
+    F8 = 0x88,
+    F9 = 0x89,
+    F10 = 0x90,
+}
+
+impl TryFrom<u8> for KeyCode {
+    type Error = ();
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        use KeyCode::*;
+        match value {
+            0x01 => Ok(JoyUp),
+            0x02 => Ok(JoyDown),
+            0x03 => Ok(JoyLeft),
+            0x04 => Ok(JoyRight),
+            0x05 => Ok(JoyCenter),
+            0x06 => Ok(BtnLeft1),
+            0x07 => Ok(BtnRight1),
+            0x08 => Ok(Backspace),
+            0x09 => Ok(Tab),
+            0x0A => Ok(Enter),
+            0x11 => Ok(BtnLeft2),
+            0x12 => Ok(BtnRight2),
+            0xA1 => Ok(ModAlt),
+            0xA2 => Ok(ModShiftLeft),
+            0xA3 => Ok(ModShiftRight),
+            0xA4 => Ok(ModSym),
+            0xA5 => Ok(ModCtrl),
+            0xB1 => Ok(Esc),
+            0xB4 => Ok(Left),
+            0xB5 => Ok(Up),
+            0xB6 => Ok(Down),
+            0xB7 => Ok(Right),
+            0xC1 => Ok(CapsLock),
+            0xD0 => Ok(Break),
+            0xD1 => Ok(Insert),
+            0xD2 => Ok(Home),
+            0xD4 => Ok(Del),
+            0xD5 => Ok(End),
+            0xD6 => Ok(PageUp),
+            0xD7 => Ok(PageDown),
+            0x81 => Ok(F1),
+            0x82 => Ok(F2),
+            0x83 => Ok(F3),
+            0x84 => Ok(F4),
+            0x85 => Ok(F5),
+            0x86 => Ok(F6),
+            0x87 => Ok(F7),
+            0x88 => Ok(F8),
+            0x89 => Ok(F9),
+            0x90 => Ok(F10),
+            _ => Err(()),
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..f1608e8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,41 @@
+#![feature(impl_trait_in_assoc_type)]
+#![no_std]
+#![no_main]
+
+#[cfg(feature = "defmt")]
+use defmt::*;
+use {defmt_rtt as _, panic_probe as _};
+
+use embassy_executor::Spawner;
+use embassy_rp::gpio::{Level, Output};
+use embassy_rp::peripherals::I2C1;
+use embassy_rp::spi::{self, Spi};
+use embassy_rp::{bind_interrupts, i2c};
+use embassy_sync::blocking_mutex::raw::NoopRawMutex;
+use embassy_sync::channel::Channel;
+use embassy_time::Timer;
+use embedded_hal_bus::spi::ExclusiveDevice;
+use embedded_sdmmc::asynchronous::{File, SdCard, ShortFileName, VolumeIdx, VolumeManager};
+use static_cell::StaticCell;
+
+mod keyboard;
+use keyboard::KeyEvent;
+
+embassy_rp::bind_interrupts!(struct Irqs {
+    I2C1_IRQ => i2c::InterruptHandler<I2C1>;
+});
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+
+    static KEYBOARD_EVENTS: StaticCell<Channel<NoopRawMutex, KeyEvent, 10>> = StaticCell::new();
+    let keyboard_events = KEYBOARD_EVENTS.init(Channel::new());
+
+    // configure keyboard event handler
+    let config = embassy_rp::i2c::Config::default();
+    let bus = embassy_rp::i2c::I2c::new_async(p.I2C1, p.PIN_27, p.PIN_26, Irqs, config);
+    spawner
+        .spawn(keyboard::keyboard(bus, keyboard_events.sender()))
+        .unwrap();
+}