linux 串口通讯源码

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

int open_serial_port(const char *port) {
    int fd;
    struct termios options;

    fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open_serial_port: Unable to open port");
        return -1;
    }

    fcntl(fd, F_SETFL, 0);

    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;

    tcsetattr(fd, TCSANOW, &options);

    return fd;
}

int main() {
    int fd;
    char buffer[256];

    fd = open_serial_port("/dev/ttyS0");
    if (fd == -1) {
        return 1;
    }

    while (1) {
        int n = read(fd, buffer, sizeof(buffer));
        if (n > 0) {
            buffer[n] = '\0';
            printf("Received: %s
", buffer);
        }
    }

    close(fd);
    return 0;
}