diff --git a/examples/stm32f7/src/bin/can.rs b/examples/stm32f7/src/bin/can.rs new file mode 100644 index 00000000..cf027cc3 --- /dev/null +++ b/examples/stm32f7/src/bin/can.rs @@ -0,0 +1,63 @@ +#![no_std] +#![no_main] +#![feature(type_alias_impl_trait)] + +use core::borrow::BorrowMut; +use core::borrow::Borrow; +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, Data}; +use embassy_stm32::can::{Can,CanTx,CanRx, 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_RX1 => Rx1InterruptHandler; + CAN3_SCE => SceInterruptHandler; + CAN3_TX => TxInterruptHandler; +}); + +#[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.can.borrow_mut().modify_filters().enable_bank(0, Fifo::Fifo0, Mask32::accept_all()); + + CAN.can.borrow_mut() + .modify_config() + .set_bit_timing(0x001c0001) // http://www.bittiming.can-wiki.info/ + .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); + } +}