ESP32 Forum

Posted: **Tue Jul 20, 2021 9:12 am**

Hi
I am trying to use 2 uart in the same project this is the first time using 2 uarts of ESP32.
i have tried combination of UART0 & UART1 or UART1 & UART2, UART2 & UART0 but no result,
there is a problem when I try to use both UARt components, only one Uart transmit out.
i am unable to diagnose problem, kindly help me in the same

i am providing code snippet

Code: Untitled.c Select all




#define EX_UART_NUM UART_NUM_2

#define BUF_SIZE (1024)

#define RD_BUF_SIZE (BUF_SIZE)

static QueueHandle_t uart0_queue, uart1_queue;



/*-------main()---------*/



esp_log_level_set(TAG, ESP_LOG_INFO);

	// Initialize NVS

    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 );



    wifi_scan();



    /* Configure parameters of an UART driver,

     * communication pins and install the driver */

    uart_config_t uart_config = {

        .baud_rate = 115200,

        .data_bits = UART_DATA_8_BITS,

        .parity = UART_PARITY_DISABLE,

        .stop_bits = UART_STOP_BITS_1,

        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE

    };

    uart_param_config(EX_UART_NUM, &uart_config);



    //Set UART 2 pins (using UART0 default pins ie no changes.)

	//-------------------------tx--rx

    uart_set_pin(EX_UART_NUM, 26, 25, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);



    //Install UART driver, and get the queue.

    uart_driver_install(EX_UART_NUM, BUF_SIZE * 2, BUF_SIZE * 2, 20, &uart0_queue, 0);



// set UART 0



 uart_param_config(0, &uart_config);



uart_set_pin(0, 4, 5, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);

    

    uart_driver_install(0, BUF_SIZE * 2, BUF_SIZE * 2, 20, &uart1_queue, 0);

ESP32 Forum

unable to use uart1 and uart2 simultaneously

unable to use uart1 and uart2 simultaneously