add shutdown delay

ch32v-insert-coin/src/app.rs

@@ -565,6 +565,7 @@ impl App {
         self.interfaces.adc_core.shutdown();
 
         self.interfaces.amp.disable();
+        crate::riscv::asm::delay(20_000_000);
     }
     pub fn volume_button(&mut self) {
         self.settings.volume.next();

ch32v-insert-coin/src/main.rs

@@ -354,7 +354,7 @@ fn app_main(mut p: hal::Peripherals) {
         led1_timer_ms: 100,
         // 4 hours:
         // shutdown_timer_s: 1,
-        shutdown_timer_s: 4 * 60 * 60,
+        shutdown_timer_s: 4 * 60 * 60 * 30 / 100,
         // led2_timer_ms: 100,
     };