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feature(Debounce and Formatting): 

Added Debounce
Modified formatting and comments
This commit is contained in:
Devoalda 2023-09-11 17:14:51 +08:00
parent e06d7be159
commit 9e31f48085
1 changed files with 45 additions and 20 deletions
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65
lab_3/lab_3.c
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@ -1,4 +1,5 @@
/** /**
* Lab 3
* To develop a simple stopwatch that measures time intervals between * To develop a simple stopwatch that measures time intervals between
* button presses. * button presses.
* *
@ -18,21 +19,35 @@
#include "pico/stdlib.h" #include "pico/stdlib.h"
#include "hardware/gpio.h" #include "hardware/gpio.h"
#define PSEUDO_BTN 15 #define PSEUDO_BTN 15 // GPIO 15 is the pseudo-button
#define DELAY_US 1000000 #define DELAY_US 1000000 // 1-second delay for repeating timer
#define DEBOUNCE_MS 200 // Debounce delay
unsigned long long time = 0; unsigned long long time = 0; // Elapsed time
struct repeating_timer timer; struct repeating_timer timer; // Repeating timer
bool repeating_timer_callback(struct repeating_timer *t) { /**
* Callback function for repeating timer
* This function will print the elapsed time every second as required by the
* lab specification.
* @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) {
// Print elapsed time every second // Print elapsed time every second
printf("Elapsed Time: %llus\n", printf("Elapsed Time: %llus\n",
(time_us_64() - time) / 1000000); (time_us_64() - time) / 1000000);
return true; return true;
} }
/**
void gpio_callback(uint gpio, uint32_t events) { * Interrupt callback function for pseudo-button (pull-up)
* This function will start the timer on button press (falling edge)
* and stop the timer on button release. (rising edge)
* @param gpio The GPIO pin that triggered the interrupt
* @param events The type of interrupt that triggered the callback
*/
void gpio_callback (uint gpio, uint32_t events) {
// 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)
{ {
@ -44,24 +59,32 @@ void gpio_callback(uint gpio, uint32_t events) {
repeating_timer_callback, repeating_timer_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) else
{ {
printf("Timer Stopped at %llu\n", time_us_64()); 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("Final Elapsed Time: %llus\n",
(time_us_64() - time) / 1000000); (time_us_64() - time) / 1000000);
time = 0; time = 0;
}
} }
} }
static void btn_init() /**
{ * 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.
*/
static void btn_init () {
gpio_init(PSEUDO_BTN); gpio_init(PSEUDO_BTN);
gpio_set_dir(PSEUDO_BTN, GPIO_IN); gpio_set_dir(PSEUDO_BTN, GPIO_IN);
gpio_set_pulls(PSEUDO_BTN, true, false); gpio_set_pulls(PSEUDO_BTN, true, false);
@ -74,13 +97,15 @@ static void btn_init()
); );
} }
int main() int main () {
{
stdio_init_all(); stdio_init_all();
btn_init(); btn_init();
while (true) { while (true)
{
tight_loop_contents(); tight_loop_contents();
// Debounce
sleep_ms(DEBOUNCE_MS);
} }
} }