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Code: Select all

#define BUZZER_NUM (GPIO_NUM_5)
#define BUZZER_PIN (GPIO_SEL_5)
...
Buzzer::Buzzer()
{
    // create the queue for receiving button push notifications.
    m_buzzerQueue = xQueueCreate(10, sizeof(BuzzerQueueEntry));
    // configure the io_conf structure.
    io_conf.pin_bit_mask = BUZZER_PIN;
    io_conf.intr_type = static_cast<gpio_int_type_t>(GPIO_PIN_INTR_DISABLE);
    io_conf.mode = GPIO_MODE_OUTPUT;
    io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
    io_conf.pull_down_en = GPIO_PULLDOWN_ENABLE;
    //configure GPIO with the given settings
    esp_err_t err = gpio_config(&io_conf);
    if (err != ESP_OK)
    {
        ESP_LOGE(TAG, "error %d configuring GPIO.", err);
    }
}

Code: Select all

void Buzzer::buzzer_task()
{
    BuzzerQueueEntry entry;
    esp_err_t err;
    uint32_t level;
    while (1)
    {
        entry.value = 0; // reset between queue reads.

        // look for a change request from our queue. Process if present.
        if (xQueueReceive(m_buzzerQueue, &entry, portMAX_DELAY) == pdTRUE)
        {
            if (entry.value > 0)
            {
                // turn buzzer on
                ESP_LOGI(TAG, "turning buzzer on.");
                level = 1;
                err = gpio_set_level(BUZZER_NUM, level);
                if (err != ESP_OK)
                {
                    ESP_LOGE(TAG, "error enabling GPIO.");
                }
                ESP_LOGI(TAG, "GPIO level is %d", gpio_get_level(BUZZER_NUM));
            }
            else
            {
                // turn buzzer off
                ESP_LOGI(TAG, "turning buzzer off.");
                level = 0;
                err = gpio_set_level(BUZZER_NUM, level);
                if (err != ESP_OK)
                {
                    ESP_LOGE(TAG, "error disabling GPIO.");
                }
                ESP_LOGI(TAG, "GPIO level is %d", gpio_get_level(BUZZER_NUM));
            }
        }
    }
}

Code: Select all

    BuzzerQueueEntry buzz;
    buzz.value = 1;
    xQueueSendToBack(buzzQueue, &buzz, 0);
    vTaskDelay(20);
    buzz.value = 0;
    xQueueSendToBack(buzzQueue, &buzz, 0);