From f4ca3071f01aaf5762b12a9e69918fae697800c3 Mon Sep 17 00:00:00 2001
From: Priec <filippriec@gmail.com>
Date: Sun, 14 Dec 2025 12:50:21 +0100
Subject: [PATCH] exti gpio wake up

---
 semestralka_2_uart/Cargo.toml         |  2 +-
 semestralka_2_uart/src/bin/main.rs    |  2 +-
 semestralka_2_uart/src/wakeup/gpio.rs | 23 +++++++++++++++++++++++
 semestralka_2_uart/src/wakeup/iwdg.rs | 10 ++--------
 semestralka_2_uart/src/wakeup/mod.rs  |  1 +
 5 files changed, 28 insertions(+), 10 deletions(-)
 create mode 100644 semestralka_2_uart/src/wakeup/gpio.rs

diff --git a/semestralka_2_uart/Cargo.toml b/semestralka_2_uart/Cargo.toml
index f57b237..bdaf178 100644
--- a/semestralka_2_uart/Cargo.toml
+++ b/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"
diff --git a/semestralka_2_uart/src/bin/main.rs b/semestralka_2_uart/src/bin/main.rs
index 152a080..adfafc7 100644
--- a/semestralka_2_uart/src/bin/main.rs
+++ b/semestralka_2_uart/src/bin/main.rs
@@ -29,7 +29,7 @@ async fn main(spawner: Spawner) {
     info!("LED ON (MCU awake)");
 
     // LED BLINK
-    spawner.spawn(led_blink(led).unwrap());
+    // spawner.spawn(led_blink(led).unwrap());
     
     // INIT HW UART
     init_hw_uart_to_pc(p.USART1, p.PA10, p.PA9, &spawner);
diff --git a/semestralka_2_uart/src/wakeup/gpio.rs b/semestralka_2_uart/src/wakeup/gpio.rs
new file mode 100644
index 0000000..7761e78
--- /dev/null
+++ b/semestralka_2_uart/src/wakeup/gpio.rs
@@ -0,0 +1,23 @@
+// src/wakeup/gpio.rs
+
+use defmt::info;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::gpio::Pull;
+use embassy_stm32::{peripherals, interrupt};
+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::Down);
+
+    loop {
+        info!("→ Waiting for rising edge on PA0…");
+        btn.wait_for_rising_edge().await;
+        info!("GPIO wake‑up: event detected!");
+    }
+}
diff --git a/semestralka_2_uart/src/wakeup/iwdg.rs b/semestralka_2_uart/src/wakeup/iwdg.rs
index 53c6479..0f1afed 100644
--- a/semestralka_2_uart/src/wakeup/iwdg.rs
+++ b/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 to:
-/// - Clear reset flags by setting `RMVF` in `RCC_CSR`.
-/// - If `SBF` in `PWR_SR` is set (woke from Standby), clear it.
+/// Call early in startup 
 ///
 /// # 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
-///
-/// # Timing
-/// - Timeout value is configured in `WATCHDOG_TIMEOUT_US` from config.rs
+/// 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);
diff --git a/semestralka_2_uart/src/wakeup/mod.rs b/semestralka_2_uart/src/wakeup/mod.rs
index 87ed559..0c6cd63 100644
--- a/semestralka_2_uart/src/wakeup/mod.rs
+++ b/semestralka_2_uart/src/wakeup/mod.rs
@@ -1,3 +1,4 @@
 // src/wakeup/mod.rs
 
 pub mod iwdg;
+pub mod gpio;