implementation of stops and reorganization of the codebase

semestralka_2_uart/src/sleep/stop.rs

@@ -0,0 +1,55 @@
+// src/sleep/stop.rs
+
+/// How to enter STOPx mode (STOP0–STOP3)
+#[derive(Debug, Clone, Copy, PartialEq, Eq, defmt::Format)]
+pub enum StopEntry {
+    Wfi,
+    Wfe,
+    WfeNoEventClear,
+}
+
+impl From<StopEntry> for u8 {
+    fn from(value: StopEntry) -> Self {
+        match value {
+            StopEntry::Wfi => 0x01,
+            StopEntry::Wfe => 0x02,
+            StopEntry::WfeNoEventClear => 0x03,
+        }
+    }
+}
+
+pub fn enter_stop1(entry: StopEntry) -> ! {
+    unsafe extern "C" {
+        fn HAL_PWREx_EnterSTOP1Mode(entry: u8);
+    }
+
+    unsafe {
+        HAL_PWREx_EnterSTOP1Mode(entry.into());
+    }
+
+    cortex_m::asm::udf()
+}
+
+pub fn enter_stop2(entry: StopEntry) -> ! {
+    unsafe extern "C" {
+        fn HAL_PWREx_EnterSTOP2Mode(entry: u8);
+    }
+
+    unsafe {
+        HAL_PWREx_EnterSTOP2Mode(entry.into());
+    }
+
+    cortex_m::asm::udf()
+}
+
+pub fn enter_stop3(entry: StopEntry) -> ! {
+    unsafe extern "C" {
+        fn HAL_PWREx_EnterSTOP3Mode(entry: u8);
+    }
+
+    unsafe {
+        HAL_PWREx_EnterSTOP3Mode(entry.into());
+    }
+
+    cortex_m::asm::udf()
+}