stm32/can: add hw test and cleanup

1 files changed, 78 insertions, 0 deletions

diff --git a/tests/stm32/src/bin/can.rs b/tests/stm32/src/bin/can.rs
new file mode 100644
index 000000000..f39f83e82
--- /dev/null
+++ b/tests/stm32/src/bin/can.rs
@@ -0,0 +1,78 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+// required-features: can
+
+#[path = "../example_common.rs"]
+mod example_common;
+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, Rx0InterruptHandler, Rx1InterruptHandler, SceInterruptHandler, TxInterruptHandler};
+use embassy_stm32::gpio::{Input, Pull};
+use embassy_stm32::peripherals::CAN1;
+use example_common::*;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    CAN1_RX0 => Rx0InterruptHandler<CAN1>;
+    CAN1_RX1 => Rx1InterruptHandler<CAN1>;
+    CAN1_SCE => SceInterruptHandler<CAN1>;
+    CAN1_TX => TxInterruptHandler<CAN1>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut p = embassy_stm32::init(config());
+    info!("Hello World!");
+
+    // HW is connected as follows:
+    // PB13 -> PD0
+    // PB12 -> PD1
+
+    // 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.PD0, Pull::Up);
+    core::mem::forget(rx_pin);
+
+    let mut can = Can::new(p.CAN1, p.PD0, p.PD1, Irqs);
+
+    info!("Configuring can...");
+
+    can.modify_filters().enable_bank(0, Fifo::Fifo0, Mask32::accept_all());
+
+    can.set_bitrate(1_000_000);
+    can.modify_config()
+        .set_loopback(true) // Receive own frames
+        .set_silent(true)
+        // .set_bit_timing(0x001c0003)
+        .enable();
+
+    info!("Can configured");
+
+    let mut i: u8 = 0;
+    loop {
+        let tx_frame = Frame::new_data(unwrap!(StandardId::new(i as _)), [i]);
+
+        info!("Transmitting frame...");
+        can.write(&tx_frame).await;
+
+        info!("Receiving frame...");
+        let (time, rx_frame) = can.read().await.unwrap();
+
+        info!("loopback time {}", time);
+        info!("loopback frame {=u8}", rx_frame.data().unwrap()[0]);
+
+        i += 1;
+        if i > 10 {
+            break;
+        }
+    }
+
+    info!("Test OK");
+    cortex_m::asm::bkpt();
+}