Merge pull request #1578 from schphil/can-split

stm32 can split method

examples/stm32f4/src/bin/can.rs

@@ -2,8 +2,8 @@
 #![no_main]
 #![feature(type_alias_impl_trait)]
 
-use cortex_m_rt::entry;
 use defmt::*;
+use embassy_executor::Spawner;
 use embassy_stm32::bind_interrupts;
 use embassy_stm32::can::bxcan::filter::Mask32;
 use embassy_stm32::can::bxcan::{Fifo, Frame, StandardId};
@@ -19,8 +19,8 @@ bind_interrupts!(struct Irqs {
     CAN1_TX => TxInterruptHandler<CAN1>;
 });
 
-#[entry]
-fn main() -> ! {
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
     info!("Hello World!");
 
     let mut p = embassy_stm32::init(Default::default());
@@ -34,9 +34,12 @@ fn main() -> ! {
 
     let mut can = Can::new(p.CAN1, p.PA11, p.PA12, Irqs);
 
-    can.modify_filters().enable_bank(0, Fifo::Fifo0, Mask32::accept_all());
+    can.as_mut()
+        .modify_filters()
+        .enable_bank(0, Fifo::Fifo0, Mask32::accept_all());
 
-    can.modify_config()
+    can.as_mut()
+        .modify_config()
         .set_bit_timing(0x001c0003) // http://www.bittiming.can-wiki.info/
         .set_loopback(true) // Receive own frames
         .set_silent(true)
@@ -45,9 +48,8 @@ fn main() -> ! {
     let mut i: u8 = 0;
     loop {
         let tx_frame = Frame::new_data(unwrap!(StandardId::new(i as _)), [i]);
-        unwrap!(nb::block!(can.transmit(&tx_frame)));
-        while !can.is_transmitter_idle() {}
-        let rx_frame = unwrap!(nb::block!(can.receive()));
+        can.write(&tx_frame).await;
+        let (_, rx_frame) = can.read().await.unwrap();
         info!("loopback frame {=u8}", unwrap!(rx_frame.data())[0]);
         i += 1;
     }

examples/stm32f7/src/bin/can.rs

@@ -0,0 +1,66 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::bind_interrupts;
+use embassy_stm32::can::bxcan::filter::Mask32;
+use embassy_stm32::can::bxcan::{Fifo, Frame, StandardId};
+use embassy_stm32::can::{
+    Can, CanTx, Rx0InterruptHandler, Rx1InterruptHandler, SceInterruptHandler, TxInterruptHandler,
+};
+use embassy_stm32::gpio::{Input, Pull};
+use embassy_stm32::peripherals::CAN3;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    CAN3_RX0 => Rx0InterruptHandler<CAN3>;
+    CAN3_RX1 => Rx1InterruptHandler<CAN3>;
+    CAN3_SCE => SceInterruptHandler<CAN3>;
+    CAN3_TX => TxInterruptHandler<CAN3>;
+});
+
+#[embassy_executor::task]
+pub async fn send_can_message(tx: &'static mut CanTx<'static, 'static, CAN3>) {
+    loop {
+        let frame = Frame::new_data(unwrap!(StandardId::new(0 as _)), [0]);
+        tx.write(&frame).await;
+        embassy_time::Timer::after(embassy_time::Duration::from_secs(1)).await;
+    }
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    info!("Hello World!");
+
+    let mut p = embassy_stm32::init(Default::default());
+
+    // The next two lines are a workaround for testing without transceiver.
+    // To synchronise to the bus the RX input needs to see a high level.
+    // Use `mem::forget()` to release the borrow on the pin but keep the
+    // pull-up resistor enabled.
+    let rx_pin = Input::new(&mut p.PA15, Pull::Up);
+    core::mem::forget(rx_pin);
+
+    let can: &'static mut Can<'static, CAN3> = static_cell::make_static!(Can::new(p.CAN3, p.PA8, p.PA15, Irqs));
+    can.as_mut()
+        .modify_filters()
+        .enable_bank(0, Fifo::Fifo0, Mask32::accept_all());
+
+    can.as_mut()
+        .modify_config()
+        .set_bit_timing(0x001c0001) // http://www.bittiming.can-wiki.info/
+        .set_loopback(true)
+        .enable();
+
+    let (tx, mut rx) = can.split();
+
+    let tx: &'static mut CanTx<'static, 'static, CAN3> = static_cell::make_static!(tx);
+    spawner.spawn(send_can_message(tx)).unwrap();
+
+    loop {
+        let frame = rx.read().await.unwrap();
+        println!("Received: {:?}", frame);
+    }
+}