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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
View File

@ -1,4 +1,5 @@
/**
* Lab 3
* To develop a simple stopwatch that measures time intervals between
* button presses.
*
@ -18,21 +19,35 @@
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#define PSEUDO_BTN 15
#define DELAY_US 1000000
#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
unsigned long long time = 0;
struct repeating_timer timer;
unsigned long long time = 0; // Elapsed time
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
printf("Elapsed Time: %llus\n",
(time_us_64() - time) / 1000000);
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
if (gpio == PSEUDO_BTN && events == GPIO_IRQ_EDGE_FALL)
{
@ -44,24 +59,32 @@ void gpio_callback(uint gpio, uint32_t events) {
repeating_timer_callback,
NULL,
&timer
);
);
}
// 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());
cancel_repeating_timer(&timer);
if (gpio == PSEUDO_BTN && events == GPIO_IRQ_EDGE_RISE)
{
printf("Timer Stopped at %llu\n", time_us_64());
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("Final Elapsed Time: %llus\n",
(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_set_dir(PSEUDO_BTN, GPIO_IN);
gpio_set_pulls(PSEUDO_BTN, true, false);
@ -74,13 +97,15 @@ static void btn_init()
);
}
int main()
{
int main () {
stdio_init_all();
btn_init();
while (true) {
while (true)
{
tight_loop_contents();
// Debounce
sleep_ms(DEBOUNCE_MS);
}
}