wake up pin working for the wake up

semestralka_2_uart/Cargo.toml

@@ -16,7 +16,7 @@ embassy-sync    = { git = "https://github.com/embassy-rs/embassy.git", branch =
 embassy-time    = { git = "https://github.com/embassy-rs/embassy.git", branch = "main", features = ["tick-hz-32_768"] }
 embassy-hal-internal = { git = "https://github.com/embassy-rs/embassy.git", branch = "main" }
 embassy-usb = { git = "https://github.com/embassy-rs/embassy.git", branch = "main" }
-embassy-stm32 = { git = "https://github.com/embassy-rs/embassy.git", branch = "main", features = ["unstable-pac", "stm32u575zi", "time-driver-tim2", "memory-x", "defmt"] }
+embassy-stm32 = { git = "https://github.com/embassy-rs/embassy.git", branch = "main", features = ["unstable-pac", "stm32u575zi", "time-driver-tim2", "memory-x", "defmt", "exti"] }
 
 embedded-hal = "1.0.0"
 embedded-graphics = "0.8.1"

semestralka_2_uart/src/bin/main.rs

@@ -11,6 +11,7 @@ use embassy_time::{Duration, Timer};
 
 use dma_gpio::config::BAUD;
 use dma_gpio::wakeup::iwdg::{clear_wakeup_flags, init_watchdog_reset};
+use dma_gpio::wakeup::gpio::gpio_wakeup;
 use dma_gpio::sleep::handler::execute_low_power;
 use dma_gpio::hw_uart_pc::init::{init_hw_uart_to_pc, LowPowerCmd, CMD_CH};
 use {defmt_rtt as _, panic_probe as _};
@@ -65,6 +66,7 @@ async fn main(spawner: Spawner) {
     info!("ready for uart");
     let mut iwdg = Some(p.IWDG);
     
+    spawner.spawn(gpio_wakeup(p.PA0, p.EXTI0).unwrap()); // exti wake up
     loop {
         let cmd = CMD_CH.receive().await;
         execute_low_power(cmd, &mut iwdg).await;

semestralka_2_uart/src/hw_uart_pc/init.rs

@@ -97,7 +97,7 @@ pub async fn uart_cmd_task() {
                     CMD_CH.send(LowPowerCmd::StopMode(StopModeConfig {
                         mode: stop_mode,
                         entry: StopEntry::Wfi, // to tu je, lebo nejdem prepisovat kod, kvoli
-                                               // posratemu halu co si nevie urobit konzistentnost
+                                               // pos**temu halu co si nevie urobit konzistentnost
                     })).await;
                     continue;
                 }

semestralka_2_uart/src/sleep/handler.rs

@@ -14,7 +14,7 @@ use defmt::info;
 pub async fn execute_low_power(
     cmd: LowPowerCmd, 
     iwdg: &mut Option<Peri<'static, peripherals::IWDG>>
-) -> ! {
+) {
     Timer::after(Duration::from_millis(10)).await;
 
     match cmd {
@@ -45,14 +45,16 @@ pub async fn execute_low_power(
         }
         LowPowerCmd::StopMode(StopModeConfig { mode, entry }) => {
             info!("Entering {:?} with {:?}", mode, entry);
-            if let Some(wdg) = iwdg.take() {
-                init_watchdog_reset(wdg).await;
-            }
             match mode {
                 StopMode::Stop0 => enter_stop0(),
                 StopMode::Stop1 => enter_stop1(entry),
                 StopMode::Stop2 => enter_stop2(entry),
-                StopMode::Stop3 => enter_stop3(entry),
+                StopMode::Stop3 => {
+                    if let Some(wdg) = iwdg.take() {
+                        init_watchdog_reset(wdg).await;
+                    }
+                    enter_stop3(entry);
+                }
             }
         }
     }

semestralka_2_uart/src/sleep/stop.rs

@@ -22,7 +22,7 @@ impl From<StopEntry> for u8 {
     }
 }
 
-pub fn enter_stop0() -> ! {
+pub fn enter_stop0() {
     unsafe extern "C" {
         fn rust_LL_PWR_SetPowerMode(mode: u32);
     }
@@ -35,12 +35,11 @@ pub fn enter_stop0() -> ! {
         let mut core = Peripherals::steal();
         core.SCB.set_sleepdeep();
         asm::wfi();
+        core.SCB.clear_sleepdeep();
     }
-
-    cortex_m::asm::udf();
 }
 
-pub fn enter_stop1(entry: StopEntry) -> ! {
+pub fn enter_stop1(entry: StopEntry) {
     unsafe extern "C" {
         fn HAL_PWREx_EnterSTOP1Mode(entry: u8);
     }
@@ -48,11 +47,9 @@ pub fn enter_stop1(entry: StopEntry) -> ! {
     unsafe {
         HAL_PWREx_EnterSTOP1Mode(entry.into());
     }
-
-    cortex_m::asm::udf()
 }
 
-pub fn enter_stop2(entry: StopEntry) -> ! {
+pub fn enter_stop2(entry: StopEntry) {
     unsafe extern "C" {
         fn HAL_PWREx_EnterSTOP2Mode(entry: u8);
     }
@@ -60,11 +57,9 @@ pub fn enter_stop2(entry: StopEntry) -> ! {
     unsafe {
         HAL_PWREx_EnterSTOP2Mode(entry.into());
     }
-
-    cortex_m::asm::udf()
 }
 
-pub fn enter_stop3(entry: StopEntry) -> ! {
+pub fn enter_stop3(entry: StopEntry) {
     unsafe extern "C" {
         fn HAL_PWREx_EnterSTOP3Mode(entry: u8);
     }
@@ -72,6 +67,4 @@ pub fn enter_stop3(entry: StopEntry) -> ! {
     unsafe {
         HAL_PWREx_EnterSTOP3Mode(entry.into());
     }
-
-    cortex_m::asm::udf()
 }

semestralka_2_uart/src/wakeup/gpio.rs

@@ -0,0 +1,25 @@
+// src/wakeup/gpio.rs
+
+use defmt::info;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::gpio::Pull;
+use embassy_stm32::{peripherals, interrupt};
+use embassy_time::{Duration, Timer};
+use embassy_hal_internal::Peri;
+
+/// GPIO pin as an EXTI wake‑up source.
+#[embassy_executor::task]
+pub async fn gpio_wakeup(
+    pin: Peri<'static, peripherals::PA0>,
+    ch: Peri<'static, peripherals::EXTI0>
+) {
+    info!("Configuring EXTI wake input on PA0 (rising edge)");
+    let mut btn = ExtiInput::new(pin, ch, Pull::Up);
+
+    loop {
+        info!("Waiting for rising edge on PA0");
+        btn.wait_for_falling_edge().await;
+        info!("GPIO wake‑up: event detected!");
+        Timer::after(Duration::from_millis(50)).await;
+    }
+}

semestralka_2_uart/src/wakeup/iwdg.rs

@@ -11,10 +11,7 @@ use crate::sleep::standby;
 use crate::config::WATCHDOG_TIMEOUT_US;
 
 /// Clears system reset and standby flags after wakeup.
-///
+/// Call early in startup 
-/// Call early in startup to:
-/// - Clear reset flags by setting `RMVF` in `RCC_CSR`.
-/// - If `SBF` in `PWR_SR` is set (woke from Standby), clear it.
 ///
 /// # Registers
 /// - `RCC_CSR` — Reset and Clock Control / Status
@@ -38,10 +35,7 @@ pub fn clear_wakeup_flags() {
 }
 
 /// Initializes the Independent Watchdog (IWDG) timer.
-/// Wakeup source: Can wake the system from Standby mode on timeout
+/// Timeout value is configured in `WATCHDOG_TIMEOUT_US` from config.rs
-///
-/// # Timing
-/// - Timeout value is configured in `WATCHDOG_TIMEOUT_US` from config.rs
 pub async fn init_watchdog_reset(iwdg: Peri<'static, peripherals::IWDG>) {
     info!("Initializing watchdog after watchdog wake...");
     let mut watchdog = IndependentWatchdog::new(iwdg, WATCHDOG_TIMEOUT_US);

semestralka_2_uart/src/wakeup/mod.rs

@@ -1,3 +1,4 @@
 // src/wakeup/mod.rs
 
 pub mod iwdg;
+pub mod gpio;