C51单片机多机通信C语言

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解决时间 2021-03-20 23:46

提问者网友：刺鸟
2021-03-20 15:56

C51单片机多机通信C语言

最佳答案

五星知识达人网友：北方的南先生
2021-03-20 16:06

单片机a,b,c. a为主机，bc为从机。a上有一个外部中断0输入，按第一次a的两个LED亮500ms，再按一下，b机的两个LED灯亮500ms，第三次按下c机的两个LED灯亮500ms，然后周而复始。两个数码管分别显示0/1/2, 和abc（bc由从机反馈）

******************************************************************
主机a：
******************************************************************
#include
#define uchar unsigned char
#define uint unsigned int
uchar leddata[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,0x40,0x00};
uchar Mode;
sbit P10 = P1^0;
sbit P13 = P1^3;
sbit P17 = P1^7;
sbit P20 = P2^0;
sbit P21 = P2^1;
void UART_init()
{

  TMOD = 0x20;
  TH1 = 0xfd;
  TL1 = 0xfd;
  TR1 = 1;
  SCON = 0xd0;
  ES = 1;
  EX0 = 1;
  IT0 = 1; //INT0下跳触发
  EA = 1;
  TI = 0;
}
void DelayMs(int ms)
{
  uchar i;
  while(ms--)
    for(i=0; i<120; i++);
}
void putc_to_SerialPort(uchar c)
{
  SBUF = c;
  while(TI == 0);
  TI = 0;
}
void MasterControl(unsigned char Addr, unsigned char Comd)
{
    TB8 = 1;
    putc_to_SerialPort(Addr);
    DelayMs(50);
    TB8 = 0;
    putc_to_SerialPort(Comd);
    DelayMs(50);
}
Ex0_int(void) interrupt 0
{
    P0 = leddata[Mode];
    P20 = 0;
    if(Mode == 0)
    {
        P2 = leddata[10];
        P10 = 0;
        P13 = 0;
        DelayMs(500);
        P10 = 1;
        P13 = 1;
//        MasterControl('b','C');
//        MasterControl('c','C');
    }
    else if(Mode == 1)
    {
        P10 = 1;
        P13 = 1;
        MasterControl('b','O');
//        MasterControl('c','C');
    }
    else if(Mode == 2)
    {
        P10 = 1;
        P13 = 1;
//        MasterControl('b','C');
        MasterControl('c','O');
    }
    Mode = (Mode + 1) % 3;
}
com_int(void) interrupt 4
{
  if(RI)
  {
    RI = 0;
    if(SBUF == 'b')
    {
     P2 = leddata[11];
    }
    if(SBUF == 'c')
    {
     P2 = leddata[12];
    }
  }
}
void main(void)
{
  P0 = 0x00;
  P1 = 0xff;
  P2 = 0x00;
  UART_init();
  Mode = 0;
  while(1);
}
******************************************************************
从机b：
******************************************************************
#include
#define uchar unsigned char
uchar RecData;
sbit P10 = P1^0;
sbit P13 = P1^3;
void UART_init()
{
  TMOD = 0x21;
  TH1 = 0xfd;
  TL1 = 0xfd;
  TR1 = 1;
  SCON = 0xf0;
  ES = 1;
  PS = 1;
  EA = 1;
}
void DelayMs(int ms)
{
  uchar i;
  while(ms--)
    for(i=0; i<120; i++);
}
void putc_to_SerialPort(uchar c)
{
  SBUF = c;
  while(TI == 0);
  TI = 0;
}
com_int(void) interrupt 4
{
  if(RI)
  {
    RecData = SBUF;
    RI = 0;
    if(RB8 == 1)  //地址
    {
      if(RecData == 'b')  //是自己的地址,置SM2=0,准备接受数据
      {
        SM2 = 0;
        putc_to_SerialPort('b');
      }
      else  //不是自己的地址
      {
        SM2 = 1;
      }
    }
    if(RB8 == 0)  //数据
    {
      if(RecData=='O')
      {
          P10 = 0;
          P13 = 0;
          DelayMs(500);
          P10 = 1;
          P13 = 1;

      }
      if(RecData=='C')
      {
          P10 = 1;
          P13 = 1;
      }
      SM2 = 1;
    }
  }
}
void main(void)
{
  P0 = 0xff;
  P1 = 0xff;
  UART_init();
  while(1);
}
******************************************************************
从机c：
******************************************************************
#include
#define uchar unsigned char
uchar RecData;
sbit P10 = P1^0;
sbit P13 = P1^3;
void UART_init()
{
  TMOD = 0x21;
  TH1 = 0xfd;
  TL1 = 0xfd;
  TR1 = 1;
  SCON = 0xf0;
  ES = 1;
  PS = 1;
  EA = 1;
}
void DelayMs(int ms)
{
  uchar i;
  while(ms--)
    for(i=0; i<120; i++);
}
void putc_to_SerialPort(uchar c)
{
  SBUF = c;
  while(TI == 0);
  TI = 0;
}
com_int(void) interrupt 4
{
  if(RI)
  {
    RecData = SBUF;
    RI = 0;
    if(RB8 == 1)  //地址
    {
      if(RecData == 'c')  //是自己的地址,置SM2=0,准备接受数据
      {
        SM2 = 0;
        putc_to_SerialPort('c');
      }
      else  //不是自己的地址
      {
        SM2 = 1;
      }
    }
    if(RB8 == 0)  //数据
    {
      if(RecData=='O')
      {
          P10 = 0;
          P13 = 0;
          DelayMs(500);
          P10 = 1;
          P13 = 1;
          SM2 = 1;
      }
      if(RecData=='C')
      {
          P10 = 1;
          P13 = 1;
          SM2 = 1;

       }
    }
  }
}
void main(void)
{
  P0 = 0xff;
  P1 = 0xff;
  UART_init();
  while(1);
}

全部回答

1楼网友：鸽屿
2021-03-20 17:20

哥们，建议你多看看基础的书吧！

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