Interrupts code is not working correctly.

[greenleaf]

I want to be able to read the signal from an lm393 sensor using the Espressif framework on an esp32.

I have the following code:

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"

#include "esp_log.h"
#include "driver/pulse_cnt.h"
#include "driver/gpio.h"
#include "esp_sleep.h"

#include "config.h"
#include "speed_calculations.h"

#define ESP_INTR_FLAG_DEFAULT 0

static QueueHandle_t gpio_evt_queue = NULL;

static void IRAM_ATTR gpio_isr_handler(void* arg)
{
    uint32_t gpio_num = (uint32_t) arg;
    xQueueSendFromISR(gpio_evt_queue, &gpio_num, NULL);
}

static void gpio_task_handler(void* arg)
{
    uint32_t io_num;
    for (;;) {
        if (xQueueReceive(gpio_evt_queue, &io_num, portMAX_DELAY)) {
            printf("GPIO[%"PRIu32"] intr, val: %d\n", io_num, gpio_get_level(io_num));
        }
    }
}

void app_main()
{
    gpio_config_t io_conf = {};
    io_conf.intr_type = GPIO_INTR_POSEDGE;
    io_conf.mode = GPIO_MODE_INPUT;
    io_conf.pin_bit_mask = CONFIG_GPIO_FRONT_WHEEL | CONFIG_GPIO_REAR_WHEEL;
    io_conf.pull_up_en = 1;
    gpio_config(&io_conf);

    gpio_set_intr_type(CONFIG_GPIO_FRONT_WHEEL | CONFIG_GPIO_REAR_WHEEL, GPIO_INTR_ANYEDGE);

    gpio_evt_queue = xQueueCreate(10, sizeof(uint32_t));
    xTaskCreate(gpio_task_handler, "gpio_task_handler", 2048, NULL, 10, NULL);

    gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
    gpio_isr_handler_add(CONFIG_GPIO_FRONT_WHEEL, gpio_isr_handler, (void*) CONFIG_GPIO_FRONT_WHEEL);
    gpio_isr_handler_add(CONFIG_GPIO_REAR_WHEEL, gpio_isr_handler, (void*) CONFIG_GPIO_FRONT_WHEEL);

    printf("Minimum free heap size: %"PRIu32" bytes\n", esp_get_minimum_free_heap_size());
    
    while (1) {
        printf("cnt: %d\n", 0);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

When uploading and setting pins 18 and 19 that are set up as the input pins nothing happens though. Additionally, the cnt message in the while loop is not printing.

How can I fix it?

[ESP_Sprite]

Can you try to move the gpio_set_intr_type() call to after you set the interrupt handlers?

[greenleaf]

That seems to work better. Not sure I understand why!

[ESP_Sprite]

That seems to work better. Not sure I understand why!

I don't entirely remember, but I think not having an interrupt handler installed for the GPIO interrupt means that if at that time an interrupt is generated, it never gets acknowledged and the ESP simply keeps running the interrupt routine over and over again.

[ok-home]

hi
I see some errors in the code here

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io_conf.pin_bit_mask = CONFIG_GPIO_FRONT_WHEEL | CONFIG_GPIO_REAR_WHEEL;

- bitmask ?

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gpio_set_intr_type(CONFIG_GPIO_FRONT_WHEEL | CONFIG_GPIO_REAR_WHEEL, GPIO_INTR_ANYEDGE);

- gpionum ???

make a separate initialization for each gpio and define where bitmask and gpionum are.