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#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/uart.h"
#include "driver/gpio.h"
#include "sdkconfig.h"

static const char *TAG = "[ECHO] ";

// use only 1 core
// CONFIG_FREERTOS_UNICORE enabled

#define ECHO_TEST_TXD GPIO_NUM_17
#define ECHO_TEST_RXD GPIO_NUM_16
// no flow control
#define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
#define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)

#define ECHO_UART_PORT_NUM      UART_NUM_2
#define ECHO_UART_BAUD_RATE     115200
#define ECHO_TASK_STACK_SIZE    2*1024

#define BUF_SIZE 256


static void echo_task(void *arg)
{
    /* Configure parameters of an UART driver,
     * communication pins and install the driver */
    uart_config_t uart_config = {
        .baud_rate = ECHO_UART_BAUD_RATE,
        .data_bits = UART_DATA_8_BITS,
        .parity    = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
        .source_clk = UART_SCLK_DEFAULT,
    };
    int intr_alloc_flags = 0;

#if CONFIG_UART_ISR_IN_IRAM
    intr_alloc_flags = ESP_INTR_FLAG_IRAM;
#endif

	QueueHandle_t uart_queue;
    ESP_ERROR_CHECK(uart_driver_install(ECHO_UART_PORT_NUM, BUF_SIZE, BUF_SIZE, 10, &uart_queue, intr_alloc_flags));
    ESP_ERROR_CHECK(uart_param_config(ECHO_UART_PORT_NUM, &uart_config));
    ESP_ERROR_CHECK(uart_set_pin(ECHO_UART_PORT_NUM, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS));

	char* test_str = "test\n\r";


    while (1) {
        uart_write_bytes(ECHO_UART_PORT_NUM, (const char *) test_str, strlen(test_str));

    }

}

void app_main(void)
{

    xTaskCreate(echo_task, "uart_echo_task", ECHO_TASK_STACK_SIZE, NULL, 1, NULL);

}

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sudo minicom -D /dev/ttyUSB0