update GPIOs to use on-chip pulldowns for volume and brightness

ch32v-insert-coin/src/debounced_gpio.rs

@@ -14,10 +14,15 @@ pub struct DebouncedGPIO<'a> {
 }
 
 impl<'a> DebouncedGPIO<'a> {
-    pub fn new(pin: AnyPin, system_tick_rate_hz: usize, debounce_time_ms: usize) -> Self {
+    pub fn new(
+        pin: AnyPin,
+        pull: Pull,
+        system_tick_rate_hz: usize,
+        debounce_time_ms: usize,
+    ) -> Self {
         // coin debounce timer (100ms)
         Self {
-            input: Input::new(pin, Pull::None),
+            input: Input::new(pin, pull),
             value: false,
             ready: false,
             active: false,

ch32v-insert-coin/src/main.rs

@@ -343,17 +343,33 @@ fn app_main(mut p: hal::Peripherals, app_settings: Settings) -> Settings {
     unsafe { system::init_gpio_irq(main_btn_pin.pin(), main_btn_pin.port(), true, true) };
 
     // coin debouncer (100ms)
-    let mut sense_coin_input =
+    let mut sense_coin_input = DebouncedGPIO::new(
-        DebouncedGPIO::new(sense_coin_pin.degrade(), core_config.tick_rate_hz, 20);
+        sense_coin_pin.degrade(),
+        Pull::None,
+        core_config.tick_rate_hz,
+        20,
+    );
     // main button debouncer (100ms)
-    let mut main_btn_input =
+    let mut main_btn_input = DebouncedGPIO::new(
-        DebouncedGPIO::new(main_btn_pin.degrade(), core_config.tick_rate_hz, 20);
+        main_btn_pin.degrade(),
+        Pull::None,
+        core_config.tick_rate_hz,
+        20,
+    );
     // button debouncer (100ms)
-    let mut volume_btn_input =
+    let mut volume_btn_input = DebouncedGPIO::new(
-        DebouncedGPIO::new(volume_btn_pin.degrade(), core_config.tick_rate_hz, 100);
+        volume_btn_pin.degrade(),
+        Pull::Down,
+        core_config.tick_rate_hz,
+        100,
+    );
     // button debouncer (100ms)
-    let mut light_ctrl_btn_input =
+    let mut light_ctrl_btn_input = DebouncedGPIO::new(
-        DebouncedGPIO::new(light_ctrl_btn_pin.degrade(), core_config.tick_rate_hz, 100);
+        light_ctrl_btn_pin.degrade(),
+        Pull::Down,
+        core_config.tick_rate_hz,
+        100,
+    );
 
     let timer_config = TimerConfig {
         sp_timer_ms: 1000,