add battery level checking

ch32v-insert-coin/src/main.rs

@@ -249,6 +249,15 @@ use insert_coin::TickTimerService;
 use insert_coin::{TickService, TickServiceData};
 
 fn app_main(mut p: hal::Peripherals) {
+    // initialize ADC core first, and exit if battery is too low
+    let mut adc = hal::adc::Adc::new(p.ADC1, Default::default());
+    let mut batt_monitor_pin = p.PD4;
+    let mut adc_core = AdcCore::new(adc, batt_monitor_pin);
+    let bv = adc_core.get_battery_voltage();
+    if bv < 421 {
+        adc_core.shutdown();
+        return;
+    }
     // === output setup ===
 
     // LED0 output setup
@@ -292,9 +301,9 @@ fn app_main(mut p: hal::Peripherals) {
     // === input setup ===
 
     // adc
-    let mut adc = hal::adc::Adc::new(p.ADC1, Default::default());
+    // let mut adc = hal::adc::Adc::new(p.ADC1, Default::default());
-    let mut batt_monitor_pin = p.PD4;
+    // let mut batt_monitor_pin = p.PD4;
-    let adc_core = AdcCore::new(adc, batt_monitor_pin);
+    // let adc_core = AdcCore::new(adc, batt_monitor_pin);
 
     // adc2
     // let mut usb_detect_dc = hal::adc::Adc::new(p.ADC1, Default::default());
@@ -555,8 +564,18 @@ fn shutdown_main(p: hal::Peripherals) {
 
     riscv::asm::delay(1_000_000);
 
-    unsafe { system::enter_standby() };
+    loop {
-    riscv::asm::wfi();
+        unsafe { system::enter_standby() };
+        riscv::asm::wfi();
+        unsafe {
+            #[allow(static_mut_refs)]
+            if (INPUT_FLAGS.sense_coin_flag.active() || INPUT_FLAGS.main_btn_flag.active())
+            // && app.should_wake()
+            {
+                break;
+            }
+        }
+    }
 
     // loop {
     //     unsafe {