p_civil_aviation_uart/cpp/uart.cpp

#include "uart.hpp"

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <iostream>

using namespace iflytop;
using namespace std;

Uart::Uart() {}
Uart::~Uart() {}

int Uart::open(string path) {
  int rc;

  m_name = path;

  m_fd = ::open(path.c_str(), O_RDWR | O_NOCTTY);
  if (m_fd < 0) {
    cout << "open " << path << " failed" << endl;
    return -1;
  }

  memset(&m_tty, 0, sizeof(m_tty));

  m_tty.c_cflag |= CLOCAL | CREAD;  // 激活本地连接与接受使能

  m_tty.c_cflag &= ~CSIZE;  // 失能数据位屏蔽
  m_tty.c_cflag |= CS8;     // 8位数据位

  m_tty.c_cflag &= ~CSTOPB;  // 1位停止位

  m_tty.c_cflag &= ~PARENB;  // 无校验位

  m_tty.c_cc[VTIME] = 0;
  m_tty.c_cc[VMIN]  = 0;

  cfsetispeed(&m_tty, B115200);  // 设置输入波特率
  cfsetospeed(&m_tty, B115200);  // 设置输出波特率

  tcflush(m_fd, TCIFLUSH);  // 刷清未处理的输入和/或输出

  /* Apply attributes */
  rc = tcsetattr(m_fd, TCSANOW, &m_tty);
  if (rc) {
    cout << "tcsetattr failed" << endl;
    return -3;
  }
  return 0;
}

int Uart::send(char *data, int size) {
  int sent = 0;
  sent     = write(m_fd, data, size);
  if (sent > 0) {
    printf("send success, data is  %s\r\n", data);
  }
  return sent;
}

int Uart::receive(char *data, int size_max) {
  int received = 0;
  received     = read(m_fd, data, size_max);
  if (received > 0) {
    printf("recv success,recv size is %d,data is  %s\r\n", received, data);
  }
  return received;
}

int Uart::close() {
  ::close(m_fd);
  m_fd = -1;
  return 0;
}

bool Uart::flush_rx() {
  if (m_fd < 0) return false;
  int rc = tcflush(m_fd, TCIFLUSH);
  return rc == 0;
}

bool Uart::flush_tx() {
  if (m_fd < 0) return false;
  int rc = tcflush(m_fd, TCOFLUSH);
  return rc == 0;
}