Updated Drivers

drivers/0x03_button/0x03_button.c

@@ -46,26 +46,41 @@
 #define LED_PIN     25
 #define DEBOUNCE_MS 20
 
+
+/**
+ * @brief Poll button state and report edge transitions over UART
+ *
+ * Reads the debounced button state, mirrors it to the LED, and prints
+ * a message when the state changes from the previous reading.
+ *
+ * @param last_state Pointer to the stored previous button state
+ */
+static void _poll_button(bool *last_state) {
+    bool pressed = button_is_pressed(BUTTON_PIN);
+    button_led_set(LED_PIN, pressed);
+    if (pressed != *last_state) {
+        printf("Button: %s\r\n", pressed ? "PRESSED" : "RELEASED");
+        *last_state = pressed;
+    }
+}
+
+
+/**
+ * @brief Application entry point for the button debounce demo
+ *
+ * Initializes button and LED, then continuously polls button state
+ * and mirrors it to the LED with UART reporting on edge transitions.
+ *
+ * @return int Does not return
+ */
 int main(void) {
     stdio_init_all();
     button_init(BUTTON_PIN, DEBOUNCE_MS);
     button_led_init(LED_PIN);
-
-    printf("Button driver initialized: button=GPIO%d  led=GPIO%d\r\n",
-           BUTTON_PIN, LED_PIN);
-
+    printf("Button driver initialized: button=GPIO%d  led=GPIO%d\r\n", BUTTON_PIN, LED_PIN);
     bool last_state = false;
-
     while (true) {
-        bool pressed = button_is_pressed(BUTTON_PIN);
-
-        button_led_set(LED_PIN, pressed);
-
-        if (pressed != last_state) {
-            printf("Button: %s\r\n", pressed ? "PRESSED" : "RELEASED");
-            last_state = pressed;
-        }
-
+        _poll_button(&last_state);
         sleep_ms(10);
     }
 }

drivers/0x03_button/button.c

@@ -33,6 +33,7 @@
 
 static uint32_t debounce_delay_ms = 20;
 
+
 /**
  * @brief Confirm a raw active-low pin read by waiting for the debounce period
  *
@@ -43,11 +44,12 @@ static uint32_t debounce_delay_ms = 20;
  * @param pin GPIO pin number to re-sample
  * @return bool true if the pin is still low after the debounce delay
  */
-static bool debounce_confirm(uint32_t pin) {
+static bool _debounce_confirm(uint32_t pin) {
     sleep_ms(debounce_delay_ms);
     return !gpio_get(pin);
 }
 
+
 void button_init(uint32_t pin, uint32_t debounce_ms) {
     debounce_delay_ms = debounce_ms;
     gpio_init(pin);
@@ -55,19 +57,26 @@ void button_init(uint32_t pin, uint32_t debounce_ms) {
     gpio_pull_up(pin);
 }
 
+
 bool button_is_pressed(uint32_t pin) {
     if (!gpio_get(pin)) {
-        return debounce_confirm(pin);
+        return _debounce_confirm(pin);
     }
     return false;
 }
 
+
 void button_led_init(uint32_t pin) {
     gpio_init(pin);
     gpio_set_dir(pin, GPIO_OUT);
     gpio_put(pin, false);
 }
 
+
+void button_led_set(uint32_t pin, bool on) {
+    gpio_put(pin, on);
+}
+
 void button_led_set(uint32_t pin, bool on) {
     gpio_put(pin, on);
 }