#include <stdio.h>
#include "driver/uart.h"

#define ECHECK(...) ESP_ERROR_CHECK(__VA_ARGS__)

QueueHandle_t uart_queue;

void uart_setup(void);

void app_main(void)
{
    uart_setup();
   
    char message[] = "Hello World\n";
    uart_write_bytes(UART_NUM_0, message, sizeof(message));
}

void uart_setup(void)
{
    // stty -F /dev/ttyUSB0 cs8 -parenb -crtscts -cstopb
    uart_config_t uart_config = {
        .baud_rate = 9600,
        .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,
    };
    
    #define UART_BUFFER_SIZE 2048
    ECHECK(uart_param_config(UART_NUM_0, &uart_config));
    ECHECK(uart_driver_install(UART_NUM_0, UART_BUFFER_SIZE, UART_BUFFER_SIZE, 10, &uart_queue, 0));
}