51 lines
1.6 KiB
Rust
51 lines
1.6 KiB
Rust
// src/wakeup/iwdg.rs
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use defmt::info;
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use embassy_stm32::peripherals;
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use embassy_stm32::wdg::IndependentWatchdog;
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use embassy_stm32::Peri;
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use embassy_time::{Duration, Timer};
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use embassy_stm32::pac;
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use crate::sleep::standby;
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use crate::config::WATCHDOG_TIMEOUT_US;
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/// Clears system reset and standby flags after wakeup.
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///
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/// Call early in startup to:
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/// - Clear reset flags by setting `RMVF` in `RCC_CSR`.
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/// - If `SBF` in `PWR_SR` is set (woke from Standby), clear it.
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///
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/// # Registers
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/// - `RCC_CSR` — Reset and Clock Control / Status
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/// - `PWR_SR` — Power Control / Status
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pub fn clear_wakeup_flags() {
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info!("Clearing wakeup flags...");
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standby::disable_sram2_full_retention();
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// Clear reset flags
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// let rcc = unsafe { &*pac::RCC::ptr() };
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let rcc = pac::RCC;
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rcc.csr().write(|w| w.set_rmvf(true));
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// Check and clear Standby wakeup flag
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// let pwr = unsafe { &*pac::PWR::ptr() };
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let pwr = pac::PWR;
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if pwr.sr().read().sbf() {
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info!("Woke from Standby mode");
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pwr.sr().write(|w| w.set_sbf(true));
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}
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}
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/// Initializes the Independent Watchdog (IWDG) timer.
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/// Wakeup source: Can wake the system from Standby mode on timeout
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///
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/// # Timing
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/// - Timeout value is configured in `WATCHDOG_TIMEOUT_US` from config.rs
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pub async fn init_watchdog_reset(iwdg: Peri<'static, peripherals::IWDG>) {
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info!("Initializing watchdog after watchdog wake...");
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let mut watchdog = IndependentWatchdog::new(iwdg, WATCHDOG_TIMEOUT_US);
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watchdog.unleash();
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Timer::after(Duration::from_millis(10)).await;
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}
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