Description
I am in the process of bringing up my own HW with STM32WLE5CC, it is essentially just STDES-WL5U4ILH reference design with a 32 MHz NX2016SA-32MHZ-EXS00A-CS11336, as recommended by the datasheet. I am testing side-by-side on the nucleo-WL55JC1 using your examples for the WL series. I am using the stm32wle5cc feature for embassy-stm32 and flashing and debugging using probe-rs with --chip STM32WLE5JCIx on both.
My config looks like this for the custom board
let mut config = embassy_stm32::Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.hse = Some(Hse {
freq: Hertz(32_000_000),
mode: HseMode::Oscillator,
prescaler: HsePrescaler::DIV1,
});
config.rcc.mux = ClockSrc::PLL1_R;
config.rcc.pll = Some(Pll {
source: PllSource::HSE,
prediv: PllPreDiv::DIV2,
mul: PllMul::MUL6,
divp: None,
divq: Some(PllQDiv::DIV2), // PLL1_Q clock (32 / 2 * 6 / 2), used for RNG
divr: Some(PllRDiv::DIV2), // sysclk 48Mhz clock (32 / 2 * 6 / 2)
});
}
let p = embassy_stm32::init(config);When stepping the lora_p2p_receive.rs example (with mode: HseMode::Oscillator) on my HW everything is fine until I get into LoRa.init()
/// Initialize a Semtech chip as the radio for LoRa physical layer communications
pub async fn init(&mut self) -> Result<(), RadioError> {
self.cold_start = true;
self.radio_kind.reset(&mut self.delay).await?;
self.radio_kind.ensure_ready(self.radio_mode).await?;
self.radio_kind.set_standby().await?;
self.radio_mode = RadioMode::Standby;
self.rx_continuous = false;
self.do_cold_start().await
}where it usually crashes inside self.radio_kind.set_standby().await?; or self.do_cold_start().await.
In case of set_standby I saw it go out on the last line self.intf.iv.disable_rf_switch().await here:
async fn disable_rf_switch(&mut self) -> Result<(), RadioError> {
match &mut self.rf_switch_rx {
Some(pin) => pin.set_low().map_err(|_| RfSwitchRx)?,
None => (),
};
match &mut self.rf_switch_tx {
Some(pin) => pin.set_low().map_err(|_| RfSwitchTx),
None => Ok(()),
}
}and in the case of do_cold_start the debug session crashed in self.radio_kind.set_oscillator().await?; again on the last line self.intf.write(&[&op_code_and_tcxo_control], false).await here:
async fn set_oscillator(&mut self) -> Result<(), RadioError> {
// voltage used to control the TCXO on/off from DIO3
let voltage = match self.board_type {
BoardType::CustomBoard | BoardType::Stm32l0Sx1276 => {
return Err(RadioError::BoardTypeUnsupportedForRadioKind);
}
BoardType::Rak3172Sx1262 => {
// uses XTAL instead of TCXO
return Ok(());
}
BoardType::GenericSx1261
| BoardType::RpPicoWaveshareSx1262
| BoardType::Rak4631Sx1262
| BoardType::Stm32wlSx1262 => TcxoCtrlVoltage::Ctrl1V7,
BoardType::HeltecWifiLoraV31262 => TcxoCtrlVoltage::Ctrl1V8,
};
let timeout = BRD_TCXO_WAKEUP_TIME << 6; // duration allowed for TCXO to reach 32MHz
let op_code_and_tcxo_control = [
OpCode::SetTCXOMode.value(),
voltage.value() & 0x07,
Self::timeout_1(timeout),
Self::timeout_2(timeout),
Self::timeout_3(timeout),
];
self.intf.write(&[&op_code_and_tcxo_control], false).await
}It always crashes the whole debug session and makes the chip unresponsive to the probe until flashed through the factory bootloader, probe-rs exits with
Debug Adapter terminated unexpectedly with an error: Other(Error executing request.
Caused by:
0: An ARM specific error occurred.
1: The debug probe encountered an error.
2: An error specific to a probe type occurred
3: Command failed with status SwdApWdataError)
I find it strange because of the places where this happens - usually returns from async calls returning results of futures, the particularly puzzling one is the self.intf.iv.disable_rf_switch().await, which I am now seeing consistently, since that's just a gpio toggle with no await in it.
Could this be just a clock instability or some corruption up the stack that causes this?
Embassy recently implemented a better handling of the RCC configuration, which added support for the XO HseMode::Oscillator configuration alongside the default TCXO HseMode::Bypass, which fixed some of the issues I was having, but now I am stuck on this.
I am trying to keep up with the development and would like to eventually contribute what I can since I really like this project and this is my Bachelors thesis. Has anyone seen something similar and could point me in the right direction? Thank you.