esp-idf/examples/common_components/protocol_examples_common/stdin_out.c

/* Common functions for protocol examples, to configure stdin and stdout.

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
 */

#include "protocol_examples_common.h"
#include "esp_err.h"
#include "driver/uart_vfs.h"
#include "driver/uart.h"
#include "sdkconfig.h"

esp_err_t example_configure_stdin_stdout(void)
{
    static bool configured = false;
    if (configured) {
      return ESP_OK;
    }
    // Initialize VFS & UART so we can use std::cout/cin
    setvbuf(stdin, NULL, _IONBF, 0);
    /* Install UART driver for interrupt-driven reads and writes */
    ESP_ERROR_CHECK( uart_driver_install( (uart_port_t)CONFIG_ESP_CONSOLE_UART_NUM,
            256, 0, 0, NULL, 0) );
    /* Tell VFS to use UART driver */
    uart_vfs_dev_use_driver(CONFIG_ESP_CONSOLE_UART_NUM);
    uart_vfs_dev_port_set_rx_line_endings(CONFIG_ESP_CONSOLE_UART_NUM, ESP_LINE_ENDINGS_CR);
    /* Move the caret to the beginning of the next line on '\n' */
    uart_vfs_dev_port_set_tx_line_endings(CONFIG_ESP_CONSOLE_UART_NUM, ESP_LINE_ENDINGS_CRLF);
    configured = true;
    return ESP_OK;
}