Linux串口通信接收与发送：接收：
Linux串口通信接收与发送：
接收：
1. 打开串口：int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
2. 设置串口参数：struct termios options;tcgetattr(fd, &options);cfsetispeed(&options, B9600);cfsetospeed(&options, B9600);options.c_cflag |= (CLOCAL | CREAD);options.c_cflag &= ~CSIZE;options.c_cflag |= CS8;options.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;options.c_cflag &= ~CRTSCTS;options.c_iflag |= IGNPAR;options.c_iflag &= ~(IXON | IXOFF | IXANY);options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);options.c_oflag &= ~OPOST;tcsetattr(fd, TCSANOW, &options);
3. 读取串口数据：char buf[128];int len = read(fd, buf, sizeof(buf));
发送：
1. 打开串口：int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
2. 设置串口参数：struct termios options;tcgetattr(fd, &options);cfsetispeed(&options, B9600);cfsetospeed(&options, B9600);options.c_cflag |= (CLOCAL | CREAD);options.c_cflag &= ~CSIZE;options.c_cflag |= CS8;options.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;options.c_cflag &= ~CRTSCTS;options.c_iflag |= IGNPAR;options.c_iflag &= ~(IXON | IXOFF | IXANY);options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);options.c_oflag &= ~OPOST;tcsetattr(fd, TCSANOW, &options);
3. 写入串口数据：char buf[128] = "hello world";int len = write(fd, buf, strlen(buf));
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