PCNT code not working

[hussain203]

Hi ,

I have problem when I add the PCNT code to my program , it does not give any compilation error but it does not count and sometime give 0 count value or in some case is it give sometime 18766 and never changed. also I have noticed that it change to 0 if I did not initilaized any GPIO.

if I remove my main code the example work fine !!!!!

I am using the V5.1.5

any idea ???

Code: Select all

// initilization the DEV.
void app_main(void)
{
   	// Initialize NVS
	ESP_LOGI(TAG, "NVS init");																				
	esp_err_t ret = nvs_flash_init();
	if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
	{
		ESP_ERROR_CHECK(nvs_flash_erase());
		ret = nvs_flash_init();
	}
	ESP_ERROR_CHECK(ret);                                                                              
	
	// Start Wifi
	wifi_app_start();

	vTaskDelay(pdMS_TO_TICKS(2000));

	//Setup Hardware , this is function in other file to initialize the hardware PINs  
	Main_app_setup();  //if I comment this the counter value becomes always 0 if not 18766

	//Create prgrame task , function to execute the other code 
	Main_app_start();  // If I comment both Main_app It work

	PCNT_Fun();
}

static bool example_pcnt_on_reach(pcnt_unit_handle_t unit, const pcnt_watch_event_data_t *edata, void *user_ctx)
{
    BaseType_t high_task_wakeup;
    QueueHandle_t queue = (QueueHandle_t)user_ctx;
    // send event data to queue, from this interrupt callback
    xQueueSendFromISR(queue, &(edata->watch_point_value), &high_task_wakeup);
    return (high_task_wakeup == pdTRUE);
}

void PCNT_Fun(void)
{
    ESP_LOGI(TAG, "install pcnt unit");
    pcnt_unit_config_t unit_config = {
        .high_limit = 50,
        .low_limit = -50,
    };
    pcnt_unit_handle_t pcnt_unit = NULL;
    ESP_ERROR_CHECK(pcnt_new_unit(&unit_config, &pcnt_unit));

    ESP_LOGI(TAG, "set glitch filter");
    pcnt_glitch_filter_config_t filter_config = {
        .max_glitch_ns = 1000,
    };
    ESP_ERROR_CHECK(pcnt_unit_set_glitch_filter(pcnt_unit, &filter_config));

    ESP_LOGI(TAG, "install pcnt channels");
    pcnt_chan_config_t chan_a_config = {
        .edge_gpio_num = EXAMPLE_EC11_GPIO_A,
        .level_gpio_num = EXAMPLE_EC11_GPIO_B,
    };
    pcnt_channel_handle_t pcnt_chan_a = NULL;
    ESP_ERROR_CHECK(pcnt_new_channel(pcnt_unit, &chan_a_config, &pcnt_chan_a));
    pcnt_chan_config_t chan_b_config = {
        .edge_gpio_num = -1,
        .level_gpio_num = -1,
    };
    pcnt_channel_handle_t pcnt_chan_b = NULL;
    ESP_ERROR_CHECK(pcnt_new_channel(pcnt_unit, &chan_b_config, &pcnt_chan_b));

    ESP_LOGI(TAG, "set edge and level actions for pcnt channels");
    ESP_ERROR_CHECK(pcnt_channel_set_edge_action(pcnt_chan_a, PCNT_CHANNEL_EDGE_ACTION_INCREASE, PCNT_CHANNEL_EDGE_ACTION_HOLD));



    ESP_LOGI(TAG, "add watch points and register callbacks");
    int watch_points[] = { -50, 0, 50};
    for (size_t i = 0; i < sizeof(watch_points) / sizeof(watch_points[0]); i++) {
        ESP_ERROR_CHECK(pcnt_unit_add_watch_point(pcnt_unit, watch_points[i]));
    }
    pcnt_event_callbacks_t cbs = {
        .on_reach = example_pcnt_on_reach,
    };
    QueueHandle_t queue = xQueueCreate(10, sizeof(int));
    ESP_ERROR_CHECK(pcnt_unit_register_event_callbacks(pcnt_unit, &cbs, queue));

    ESP_LOGI(TAG, "enable pcnt unit");
    ESP_ERROR_CHECK(pcnt_unit_enable(pcnt_unit));
    ESP_LOGI(TAG, "clear pcnt unit");
    ESP_ERROR_CHECK(pcnt_unit_clear_count(pcnt_unit));
    ESP_LOGI(TAG, "start pcnt unit");
    ESP_ERROR_CHECK(pcnt_unit_start(pcnt_unit));

    // Report counter value
    int pulse_count = 0;
    int event_count = 0;
    while (1) {
        if (xQueueReceive(queue, &event_count, pdMS_TO_TICKS(1000))) {
			pulse_count++;
            ESP_LOGI(TAG, "Watch point event, count: %d", event_count);
        } else {
            ESP_ERROR_CHECK(pcnt_unit_get_count(pcnt_unit, &pulse_count));
            ESP_LOGI(TAG, "Pulse count: %d", pulse_count);
        }
    }
}