esp-protocols/components/esp_modem/src/esp_modem_uart_linux.cpp

/*
 * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <termios.h>
#include <sys/ioctl.h>
#include "esp_log.h"
#include "cxx_include/esp_modem_dte.hpp"
#include "esp_modem_config.h"
#include "uart_resource.hpp"

namespace esp_modem {

constexpr const char *TAG = "uart_resource";

uart_resource::uart_resource(const esp_modem_uart_term_config *config, QueueHandle_t *event_queue, int fd): port(-1)
{
    ESP_LOGD(TAG, "Creating uart resource" );
    struct termios tty = {};
    ESP_MODEM_THROW_IF_FALSE(tcgetattr(fd, &tty) == 0, "Failed to tcgetattr()");

    tty.c_cflag &= ~PARENB;
    tty.c_cflag &= ~CSTOPB;
    tty.c_cflag &= ~CSIZE; // Clear all the size bits, then use one of the statements below
    tty.c_cflag |= CS8; // 8 bits per byte (most common)
    tty.c_cflag &= ~CRTSCTS; // Disable RTS/CTS hardware flow control (most common)
    tty.c_cflag |= CREAD | CLOCAL; // Turn on READ & ignore ctrl lines (CLOCAL = 1)
    tty.c_lflag &= ~ICANON;
    tty.c_lflag &= ~ECHO; // Disable echo
    tty.c_lflag &= ~ISIG; // Disable interpretation of INTR, QUIT and SUSP
    tty.c_iflag &= ~(IXON | IXOFF | IXANY); // Turn off s/w flow ctrl
    tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL); // Disable any special handling of received bytes
    tty.c_oflag &= ~OPOST; // Prevent special interpretation of output bytes (e.g. newline chars)
    tty.c_oflag &= ~ONLCR; // Prevent conversion of newline to carriage return/line feed
    tty.c_cc[VTIME] = 0;
    tty.c_cc[VMIN] = 0;
    cfsetispeed(&tty, B115200);
    cfsetospeed(&tty, B115200);
    cfsetspeed(&tty, B115200);
    ioctl(fd, TCSETS, &tty);
}

uart_resource::~uart_resource() = default;

} // namespace esp_modem