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feature(Debounce): 

Modified Debounce to compare with state
This commit is contained in:
Devoalda 2023-09-12 20:57:32 +08:00
parent 9e31f48085
commit 303af1a611
1 changed files with 47 additions and 23 deletions
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70
lab_3/lab_3.c
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@ -21,11 +21,13 @@
#define PSEUDO_BTN 15 // GPIO 15 is the pseudo-button #define PSEUDO_BTN 15 // GPIO 15 is the pseudo-button
#define DELAY_US 1000000 // 1-second delay for repeating timer #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 struct repeating_timer timer; // Repeating timer
/** /**
* Callback function for repeating timer * Callback function for repeating timer
* This function will print the elapsed time every second as required by the * 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 * @param t The timer that triggered the callback
* @return True to keep the timer running, false to stop it * @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 // Print elapsed time every second
printf("Elapsed Time: %llus\n", printf("Elapsed Time: %llus\n", time);
(time_us_64() - time) / 1000000);
return true; 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) * Interrupt callback function for pseudo-button (pull-up)
* This function will start the timer on button press (falling edge) * 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 * @param events The type of interrupt that triggered the callback
*/ */
void gpio_callback (uint gpio, uint32_t events) { 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 // Start timer on button press
if (gpio == PSEUDO_BTN && events == GPIO_IRQ_EDGE_FALL) 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( add_repeating_timer_us(
DELAY_US, DELAY_US,
repeating_timer_callback, elapsed_time_callback,
NULL, NULL,
&timer &timer
); );
} }
// Stop timer on button release // 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) * 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 () { static void btn_init () {
gpio_init(PSEUDO_BTN); gpio_init(PSEUDO_BTN);
@ -104,8 +130,6 @@ int main () {
while (true) while (true)
{ {
tight_loop_contents(); tight_loop_contents();
// Debounce
sleep_ms(DEBOUNCE_MS);
} }
} }