add dummy syncro

dodo.py

@@ -88,6 +88,16 @@ def task_install_dep():
         ],
     }
 
+def task_check():
+    """ Run a compiler check on the code.
+    """
+    task = {
+        'file_dep': get_build_dep(),
+        'actions': [f'RUSTFLAGS="{consts.RUSTC_FLAGS}" cargo check --target={consts.TARGET} {consts.CARGO_COMPILE_FLAGS}'],
+    }
+    print(task)
+    return task
+
 def task_compile():
     """ Compile the sources.
     """

flash.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/sh
+
+udisksctl mount -b /dev/disk/by-label/BOOT
+cp kernel8.img /run/media/me/BOOT/kernel8.img
+udisksctl unmount -b /dev/disk/by-label/BOOT

src/bsp/rpi3/uart.rs

@@ -4,24 +4,27 @@ use core::arch::asm;
 use core::fmt;
 
 use crate::traits::console::{Write, Console};
+use crate::traits::synchronization::{DummyMutex, Mutex};
 
 use super::memory_map::uart as mm;
 
-
 pub struct Uart<'a> {
+    inner: DummyMutex<UartInner<'a>>,
+}
+
+pub struct UartInner<'a> {
     initialized: bool,
     memory_map: &'a mm::UartMemoryMap,
 }
 
-impl<'a> Uart<'a> {
-    // TODO: not sure this should be public outside of bsp.
+impl<'a> UartInner<'a> {
     /// Constructor for [`Uart`].
-    pub const fn new(memory_map: &'a mm::UartMemoryMap) -> Self {
-        Uart { initialized: false, memory_map }
+    const fn new(memory_map: &'a mm::UartMemoryMap) -> Self {
+        Self { initialized: false, memory_map }
     }
 
     /// Initialise the UART.
-    pub fn init(&mut self) {
+    fn init(&mut self) {
         // TODO: Recover from possible previous test.
         
         self.flush();
@@ -68,26 +71,11 @@ impl<'a> Uart<'a> {
     fn is_tx_full(&self) -> bool {
         self.memory_map.fr_txff.read() != 0
     }
-}
 
-// Allow the use of uart for fmt::Write::write_fmt.
-impl fmt::Write for Uart<'_> {
-    fn write_str(&mut self, s: &str) -> fmt::Result {
-        for c in s.chars() {
-            if c == '\n' {
-                Write::write_char(self, '\r');
-            }
-            Write::write_char(self, c);
-        }
-        Ok(())
-    }
-}
-
-// TODO: add sync
-impl Write for Uart<'_> {
+    /// Write a character to the Uart
     fn write_char(&self, c: char) {
         if !self.initialized {
-            //panic!("Cannot write to a non initialized UART");
+            panic!("Cannot write to a non initialized UART");
         }
         while self.is_tx_full() {
             use super::gpio;
@@ -97,12 +85,7 @@ impl Write for Uart<'_> {
         self.memory_map.dr_data.write_without_read(c as u32);
     }
 
-    fn write_fmt(&self, args: fmt::Arguments) -> fmt::Result {
-        // TODO: use syncronisation here
-        let mut new_uart = Uart { initialized: self.initialized, memory_map: self.memory_map};
-        fmt::Write::write_fmt(&mut new_uart, args)
-    }
-
+    /// Flush the uart
     fn flush(&self) {
         while self.is_busy() {
             unsafe { asm!("nop") };
@@ -110,13 +93,58 @@ impl Write for Uart<'_> {
     }
 }
 
+// Allow the use of uart for fmt::Write::write_fmt.
+impl fmt::Write for UartInner<'_> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        for c in s.chars() {
+            if c == '\n' {
+                UartInner::write_char(self, '\r');
+            }
+            UartInner::write_char(self, c);
+        }
+        Ok(())
+    }
+}
+
+impl Write for Uart<'_> {
+    fn write_char(&self, c: char) {
+        self.inner.lock(|uart| uart.write_char(c))
+    }
+
+    fn write_fmt(&self, args: fmt::Arguments) -> fmt::Result {
+        self.inner.lock(|uart| fmt::Write::write_fmt(uart, args))
+    }
+
+    fn flush(&self) {
+        self.inner.lock(|uart| uart.flush())
+    }
+}
+
+impl<'a> Uart<'a> {
+
+    // TODO: not sure this should be public? public in bsp only?
+    /// Create a new UART object
+    const fn new(memory_map: &'a mm::UartMemoryMap) -> Self {
+        Self {
+            inner: DummyMutex::new(
+                UartInner::new(memory_map)
+            )
+        }
+    }
+
+    /// Initialize the UART.
+    fn init(&self) {
+        self.inner.lock(|uart| uart.init())
+    }
+}
+
 impl Console for Uart<'_> {}
 
-static UART: Uart = Uart { initialized: true, memory_map: &mm::UART }; // TODO: use sync
+/// The UART object
+static UART: Uart = Uart::new(&mm::UART);
 
 pub fn init() {
-    let mut uart = Uart::new(&mm::UART);
-    uart.init();
+    UART.init();
 }
 
 // TODO: move?