stop0 working

semestralka_2_uart/src/sleep/stop.rs

@@ -1,5 +1,9 @@
 // src/sleep/stop.rs
 
+use cortex_m::peripheral::SCB;
+use cortex_m::Peripherals;
+use cortex_m::asm;
+
 /// How to enter STOPx mode (STOP0–STOP3)
 #[derive(Debug, Clone, Copy, PartialEq, Eq, defmt::Format)]
 pub enum StopEntry {
@@ -18,6 +22,24 @@ impl From<StopEntry> for u8 {
     }
 }
 
+pub fn enter_stop0() -> ! {
+    unsafe extern "C" {
+        fn rust_LL_PWR_SetPowerMode(mode: u32);
+    }
+
+    const LL_PWR_STOP0_MODE: u32 = 0; //stm32u5xx_ll_pwr.h
+
+    unsafe {
+        rust_LL_PWR_SetPowerMode(LL_PWR_STOP0_MODE);
+
+        let mut core = Peripherals::steal();
+        core.SCB.set_sleepdeep();
+        asm::wfi();
+    }
+
+    cortex_m::asm::udf();
+}
+
 pub fn enter_stop1(entry: StopEntry) -> ! {
     unsafe extern "C" {
         fn HAL_PWREx_EnterSTOP1Mode(entry: u8);