basic fs syscall(s)

abi_sys/Cargo.toml

@@ -11,3 +11,4 @@ embedded-graphics = "0.8.1"
 strum = { version = "0.27.2", default-features = false, features = ["derive"] }
 defmt = { version = "0.3", optional = true }
 shared = { path = "../shared" }
+embedded-sdmmc = { version = "0.9.0", default-features = false }

abi_sys/src/lib.rs

@@ -8,6 +8,7 @@ use embedded_graphics::{
     geometry::Point,
     pixelcolor::{Rgb565, RgbColor},
 };
+use embedded_sdmmc::DirEntry;
 pub use shared::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
 use strum::{EnumCount, EnumIter};
 
@@ -21,19 +22,22 @@ pub static mut CALL_ABI_TABLE: [usize; CallAbiTable::COUNT] = [0; CallAbiTable::
 #[derive(Clone, Copy, EnumIter, EnumCount)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum CallAbiTable {
-    Print = 0,
-    Sleep = 1,
+    PrintString = 0,
+    SleepMs = 1,
     LockDisplay = 2,
     DrawIter = 3,
     GetKey = 4,
     GenRand = 5,
+    ListDir = 6,
+    ReadFile = 7,
 }
 
 pub type PrintAbi = extern "C" fn(ptr: *const u8, len: usize);
 
 #[allow(unused)]
 pub fn print(msg: &str) {
-    let f: PrintAbi = unsafe { core::mem::transmute(CALL_ABI_TABLE[CallAbiTable::Print as usize]) };
+    let f: PrintAbi =
+        unsafe { core::mem::transmute(CALL_ABI_TABLE[CallAbiTable::PrintString as usize]) };
     f(msg.as_ptr(), msg.len());
 }
 
@@ -41,7 +45,8 @@ pub type SleepAbi = extern "C" fn(ms: u64);
 
 #[allow(unused)]
 pub fn sleep(ms: u64) {
-    let f: SleepAbi = unsafe { core::mem::transmute(CALL_ABI_TABLE[CallAbiTable::Sleep as usize]) };
+    let f: SleepAbi =
+        unsafe { core::mem::transmute(CALL_ABI_TABLE[CallAbiTable::SleepMs as usize]) };
     f(ms);
 }
 
@@ -89,3 +94,38 @@ pub fn gen_rand(req: &mut RngRequest) {
         f(req)
     }
 }
+
+pub type ListDir =
+    extern "C" fn(str: *const u8, len: usize, files: *mut Option<DirEntry>, file_len: usize);
+
+#[allow(unused)]
+pub fn list_dir(path: &str, files: &mut [Option<DirEntry>]) {
+    unsafe {
+        let ptr = CALL_ABI_TABLE[CallAbiTable::ListDir as usize];
+        let f: ListDir = core::mem::transmute(ptr);
+        f(path.as_ptr(), path.len(), files.as_mut_ptr(), files.len())
+    }
+}
+
+pub type ReadFile = extern "C" fn(
+    str: *const u8,
+    len: usize,
+    read_from: usize,
+    buf: *mut u8,
+    buf_len: usize,
+) -> usize;
+
+#[allow(unused)]
+pub fn read_file(file: &str, read_from: usize, buf: &mut [u8]) -> usize {
+    unsafe {
+        let ptr = CALL_ABI_TABLE[CallAbiTable::ReadFile as usize];
+        let f: ReadFile = core::mem::transmute(ptr);
+        f(
+            file.as_ptr(),
+            file.len(),
+            read_from,
+            buf.as_mut_ptr(),
+            buf.len(),
+        )
+    }
+}