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bxcan: Fix the flaky CAN example

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This commit is contained in:
Timo Kröger 2021-08-09 15:59:05 +02:00 committed by Dario Nieuwenhuis
parent 191a589820
commit dacf75d911
1 changed files with 15 additions and 2 deletions
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17
examples/stm32f4/src/bin/can.rs
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@ -8,8 +8,10 @@
mod example_common; mod example_common;
use cortex_m_rt::entry; use cortex_m_rt::entry;
use embassy_stm32::can::filter::Mask32;
use embassy_stm32::can::{Can, Frame, StandardId}; use embassy_stm32::can::{Can, Frame, StandardId};
use embassy_stm32::dbgmcu::Dbgmcu; use embassy_stm32::dbgmcu::Dbgmcu;
use embassy_stm32::gpio::{Input, Pull};
use example_common::*; use example_common::*;
#[entry] #[entry]
@ -20,11 +22,22 @@ fn main() -> ! {
Dbgmcu::enable_all(); Dbgmcu::enable_all();
} }
let p = embassy_stm32::init(Default::default()); 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.PA11, Pull::Up);
core::mem::forget(rx_pin);
let mut can = Can::new(p.CAN1, p.PA11, p.PA12); let mut can = Can::new(p.CAN1, p.PA11, p.PA12);
can.modify_config().set_loopback(true); can.modify_config()
.set_bit_timing(0x001c0003) // http://www.bittiming.can-wiki.info/
.set_loopback(true) // Receive own frames
.set_silent(true);
can.modify_filters().enable_bank(0, Mask32::accept_all());
unwrap!(nb::block!(can.enable())); unwrap!(nb::block!(can.enable()));
let mut i: u8 = 0; let mut i: u8 = 0;