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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 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",
(time_us_64() - time) / 1000000);
printf("Elapsed Time: %llus\n", time);
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("Timer Started at %llu\n", time);
printf("\n====================================\n");
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)
{
printf("Timer Stopped at %llu\n", time_us_64());
cancel_repeating_timer(&timer);
cancel_repeating_timer(&timer);
// Print elapsed time and reset
printf("Final Elapsed Time: %llus\n",
(time_us_64() - time) / 1000000);
// Print elapsed time and reset
printf("\n====================================\n");
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
* with a pull-up resistor.
* The interrupt is configured to trigger on both rising and falling edges.
* The pseudo-button is connected to GPIO 15 and is configured as
* an input with a pull-up resistor.
* 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);
}
}