Button counter with interrupt
Posted: Thu Apr 02, 2020 11:53 am
I want to increment a variable every second when an interrupt is triggered. Code on esp32, esp-idf. I have connected a button, when the button is pressed I want to count the number of seconds.
I did this using polling function, but I want to learn how to do it with interrupt, so counting and polling only when the button is pressed and not checking every second for a button pushed
It works, but when the code enter in the while(buttonState == 1) the loop never ends.
What am I doing wrong?
I did this using polling function, but I want to learn how to do it with interrupt, so counting and polling only when the button is pressed and not checking every second for a button pushed
Code: Untitled.c Select all
#include <stdio.h>
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#define ESP_INTR_FLAG_DEFAULT 0
#define BLINK_LED 13
#define GPIO_INPUT_IO_0 33
int buttonCount = 0;
int i = 0;
SemaphoreHandle_t xSemaphore = NULL;
TaskHandle_t printVariableTask = NULL;
void printVariable(void *pvParameter) {
int a = (int) pvParameter;
while (1) {
printf("A is a: %d \n", a++);
vTaskDelay(1000 / portTICK_RATE_MS);
}
}
// interrupt service routine, called when the button is pressed
void IRAM_ATTR button_isr_handler(void* arg) {
// notify the button task
xSemaphoreGiveFromISR(xSemaphore, NULL);
}
// task that will react to button clicks
void button_task(void* arg) {
// infinite loop
for(;;) {
// wait for the notification from the ISR
if(xSemaphoreTake(xSemaphore,portMAX_DELAY) == pdTRUE) {
int buttonState = gpio_get_level(GPIO_INPUT_IO_0);
while(buttonState == 1){ //code stucks here!!!!
buttonCount++;
printf("GPIO_INPUT_IO_0 %d\n", buttonState);
printf("Button pressed! %d \n", i++);
gpio_set_level(BLINK_LED, buttonState);
vTaskDelay(1000 / portTICK_RATE_MS);
}
}
}
}
void app_main()
{
// create the binary semaphore
xSemaphore = xSemaphoreCreateBinary();
// configure button and led pins as GPIO pins
gpio_pad_select_gpio(GPIO_INPUT_IO_0);
gpio_pad_select_gpio(BLINK_LED);
// set the correct direction
gpio_set_direction(GPIO_INPUT_IO_0, GPIO_MODE_INPUT);
gpio_set_direction(BLINK_LED, GPIO_MODE_OUTPUT);
// enable interrupt on falling (1->0) edge for button pin
gpio_set_intr_type(GPIO_INPUT_IO_0, GPIO_INTR_POSEDGE);
// start the task that will handle the button
xTaskCreate(button_task, "button_task", 2048, NULL, 10, NULL);
// install ISR service with default configuration
gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
// attach the interrupt service routine
gpio_isr_handler_add(GPIO_INPUT_IO_0, button_isr_handler, NULL);
int pass = 25;
xTaskCreate(&printVariable, "printVariable", 2048, (void*) pass, 5, &printVariableTask);
}What am I doing wrong?