C语言串口读取完整的报文

可以使用以下代码来读取完整的串口报文：

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>

int main() {
    int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open");
        return -1;
    }

    struct termios options;
    tcgetattr(fd, &options);
    cfsetispeed(&options, B9600);
    cfsetospeed(&options, B9600);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    options.c_cflag &= ~CRTSCTS;
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_iflag &= ~(IXON | IXOFF | IXANY);
    options.c_oflag &= ~OPOST;
    options.c_cc[VMIN] = 1;
    options.c_cc[VTIME] = 0;
    tcsetattr(fd, TCSANOW, &options);

    char buffer[255];
    int n = 0;
    while (1) {
        int len = read(fd, buffer + n, 255 - n);
        if (len > 0) {
            n += len;
            if (buffer[n - 1] == '\n') {
                buffer[n - 1] = '\0';
                printf("Received message: %s\n", buffer);
                n = 0;
            }
        }
    }

    close(fd);
    return 0;
}

这段代码使用了 Linux 下的串口通信 API，可以读取串口发送过来的完整报文。