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: [Select all] [Expand/Collapse]

 
#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