甲机串口通信程序c语言,单片机C语言程序设计：甲机通过串口控制乙机 LED

好的，下面是甲机串口通信程序C语言和单片机C语言程序设计：

甲机串口通信程序C语言：

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

#define BAUDRATE B9600
#define MODEMDEVICE "/dev/ttyS0"
#define _POSIX_SOURCE 1
#define FALSE 0
#define TRUE 1

int main()
{
    int fd, res;
    struct termios oldtio, newtio;
    char buf[255];

    fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY);
    if (fd < 0)
    {
        perror(MODEMDEVICE);
        exit(1);
    }

    tcgetattr(fd, &oldtio);
    bzero(&newtio, sizeof(newtio));

    newtio.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD;
    newtio.c_iflag = IGNPAR;
    newtio.c_oflag = 0;

    newtio.c_cc[VTIME] = 0;
    newtio.c_cc[VMIN] = 1;

    tcflush(fd, TCIFLUSH);
    tcsetattr(fd, TCSANOW, &newtio);

    while (TRUE)
    {
        res = read(fd, buf, 255);
        if (res > 0)
        {
            buf[res] = 0;
            printf("Received message: %s\n", buf);

            if (strcmp(buf, "LED_ON") == 0)
            {
                // 控制乙机LED灯亮
                // TODO
            }
            else if (strcmp(buf, "LED_OFF") == 0)
            {
                // 控制乙机LED灯灭
                // TODO
            }
        }
    }

    tcsetattr(fd, TCSANOW, &oldtio);
    close(fd);

    return 0;
}

单片机C语言程序设计：

#include <reg52.h>
#include <stdio.h>

#define BAUDRATE 9600

sbit LED = P1^0;

void init_serial()
{
    TMOD = 0x20;
    TH1 = TL1 = 256 - FOSC / (BAUDRATE * 12);
    TR1 = 1;
    SM0 = 0;
    SM1 = 1;
    REN = 1;
}

void send_char(char c)
{
    SBUF = c;
    while (!TI);
    TI = 0;
}

char receive_char()
{
    while (!RI);
    RI = 0;
    return SBUF;
}

void main()
{
    init_serial();
    while (1) {
        char c = receive_char();
        if (c == '1') {
            LED = 1; // LED灯亮
            send_char('A'); // 回复甲机
        } else if (c == '0') {
            LED = 0; // LED灯灭
            send_char('A'); // 回复甲机
        }
    }
}

以上代码仅供参考，具体实现需要根据实际情况进行修改。