113 lines
2.2 KiB
C++
113 lines
2.2 KiB
C++
#ifndef SERIAL_PORT_H
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#define SERIAL_PORT_H
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#include <termios.h>
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#include <sys/select.h>
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#include <string>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/serial.h>
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#include <unistd.h>
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#include <iostream>
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#include <memory>
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#include <chrono>
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#include <queue>
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class SerialPort
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{
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public:
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using SharedPtr = std::shared_ptr<SerialPort>;
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SerialPort(std::string port, speed_t baudrate, int timeout_ms = 2)
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{
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set_timeout(timeout_ms);
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Init(port, baudrate);
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}
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~SerialPort()
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{
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close(fd_);
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}
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ssize_t send(const uint8_t* data, size_t len)
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{
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ssize_t ret = ::write(fd_, data, len);
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return ret;
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}
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ssize_t recv(uint8_t* data, size_t len)
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{
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FD_ZERO(&rSet_);
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FD_SET(fd_, &rSet_);
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ssize_t recv_len = 0;
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switch (select(fd_ + 1, &rSet_, NULL, NULL, &timeout_))
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{
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case -1: // error
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// std::cout << "communication error" << std::endl;
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break;
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case 0: // timeout
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// std::cout << "timeout" << std::endl;
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break;
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default:
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recv_len = ::read(fd_, data, len);
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break;
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}
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return recv_len;
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}
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void set_timeout(int timeout_ms)
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{
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timeout_.tv_sec = timeout_ms / 1000;
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timeout_.tv_usec = (timeout_ms % 1000) * 1000;
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}
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private:
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void Init(std::string port, speed_t baudrate)
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{
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int ret;
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// Open serial port
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fd_ = open(port.c_str(), O_RDWR | O_NOCTTY);
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if (fd_ < 0)
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{
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printf("Open serial port %s failed\n", port.c_str());
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exit(-1);
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}
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// Set attributes
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struct termios option;
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memset(&option, 0, sizeof(option));
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ret = tcgetattr(fd_, &option);
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option.c_oflag = 0;
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option.c_lflag = 0;
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option.c_iflag = 0;
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cfsetispeed(&option, baudrate);
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cfsetospeed(&option, baudrate);
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option.c_cflag &= ~CSIZE;
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option.c_cflag |= CS8; // 8
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option.c_cflag &= ~PARENB; // no parity
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option.c_iflag &= ~INPCK; // no parity
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option.c_cflag &= ~CSTOPB; // 1 stop bit
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option.c_cc[VTIME] = 0;
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option.c_cc[VMIN] = 0;
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option.c_lflag |= CBAUDEX;
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ret = tcflush(fd_, TCIFLUSH);
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ret = tcsetattr(fd_, TCSANOW, &option);
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}
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int fd_;
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fd_set rSet_;
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timeval timeout_;
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std::queue<uint8_t> recv_queue;
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std::array<uint8_t, 1024> recv_buf;
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};
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#endif // SERIAL_PORT_H
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