feature(Debounce):

Modified Debounce to compare with state

lab_3/lab_3.c

@@ -21,11 +21,13 @@
 
 #define PSEUDO_BTN  15          // GPIO 15 is the pseudo-button
 #define DELAY_US    1000000     // 1-second delay for repeating timer
-#define DEBOUNCE_MS 200         // Debounce delay
+#define DEBOUNCE_US 100          // 100us debounce delay
 
-unsigned long long time = 0;    // Elapsed time
+u_int64_t time = 0;             // Elapsed time
+u_int prev_state = 0;           // Previous state of pseudo-button
 struct repeating_timer timer;   // Repeating timer
 
+
 /**
  * Callback function for repeating timer
  * This function will print the elapsed time every second as required by the
@@ -33,13 +35,25 @@ struct repeating_timer timer;   // Repeating timer
  * @param t    The timer that triggered the callback
  * @return     True to keep the timer running, false to stop it
  */
-bool repeating_timer_callback (struct repeating_timer *t) {
+bool elapsed_time_callback (struct repeating_timer *t) {
+    time++;
     // Print elapsed time every second
-    printf("Elapsed Time: %llus\n",
+    printf("Elapsed Time: %llus\n", time);
-           (time_us_64() - time) / 1000000);
     return true;
 }
 
+/**
+ * Debounce callback function to check if the current state
+ * is equal to the previous state.
+ * @param id         The alarm ID
+ * @param new_event  The previous state of the pseudo-button
+ * @return           True if the current state is equal to the previous state
+ */
+int64_t debounce_callback(alarm_id_t id, void *new_event) {
+    printf("Debounce Callback\n");
+    return (prev_state == *(uint32_t *)new_event);
+}
+
 /**
  * Interrupt callback function for pseudo-button (pull-up)
  * This function will start the timer on button press (falling edge)
@@ -48,41 +62,53 @@ bool repeating_timer_callback (struct repeating_timer *t) {
  * @param events    The type of interrupt that triggered the callback
  */
 void gpio_callback (uint gpio, uint32_t events) {
+    // Debounce algorithm
+    prev_state = prev_state == 0 ? events : prev_state;
+
+    // Create an alarm that will trigger after 10ms
+    add_alarm_in_us(
+            DEBOUNCE_US,
+            debounce_callback,
+            &events,
+            false
+            );
+
     // Start timer on button press
     if (gpio == PSEUDO_BTN && events == GPIO_IRQ_EDGE_FALL)
     {
-        time = time_us_64();
+        printf("\n====================================\n");
-        printf("Timer Started at %llu\n", time);
+        printf("Timer Started\n");
+        printf("====================================\n");
 
         add_repeating_timer_us(
                 DELAY_US,
-                repeating_timer_callback,
+                elapsed_time_callback,
                 NULL,
                 &timer
         );
     }
     // Stop timer on button release
-    else
+    if (gpio == PSEUDO_BTN && events == GPIO_IRQ_EDGE_RISE)
     {
-        if (gpio == PSEUDO_BTN && events == GPIO_IRQ_EDGE_RISE)
+        cancel_repeating_timer(&timer);
-        {
-            printf("Timer Stopped at %llu\n", time_us_64());
-            cancel_repeating_timer(&timer);
 
-            // Print elapsed time and reset
+        // Print elapsed time and reset
-            printf("Final Elapsed Time: %llus\n",
+        printf("\n====================================\n");
-                   (time_us_64() - time) / 1000000);
+        printf("Timer Stopped\n");
+        printf("====================================\n");
+        printf("Final Elapsed Time: %llus\n", time);
+        printf("====================================\n");
 
-            time = 0;
+        time = 0;
-        }
     }
 }
 
 /**
  * Initialize the pseudo-button (pull-up)
- * The pseudo-button is connected to GPIO 15 and is configured as an input
+ * The pseudo-button is connected to GPIO 15 and is configured as
- * with a pull-up resistor.
+ * an input with a pull-up resistor.
- * The interrupt is configured to trigger on both rising and falling edges.
+ * The interrupt is configured to trigger on both rising and
+ * falling edges.
  */
 static void btn_init () {
     gpio_init(PSEUDO_BTN);
@@ -104,8 +130,6 @@ int main () {
     while (true)
     {
         tight_loop_contents();
-        // Debounce
-        sleep_ms(DEBOUNCE_MS);
     }
 
 }