主机通信程序:
//------------串口2发通信函数------------------//
uchar master(uchar addr,uchar command)
{
uchar aa,i,p;
while(1)
{
S2BUF=addr; //发送呼叫地址
while(!(S2CON&0X02));
S2CON &=0XFD; //清除TI
while(!(S2CON&0X01));
S2CON &=0XFE; //清除RI
if(S2BUF!=addr) //若地址错,发复位信号
err();
else
{
S2CON&=0XF7; //清除地址标志S2TB8
S2BUF=command; //发主机控制命令
while(!(S2CON &0X02));
S2CON &=0XFD;
while(!(S2CON&0X01));
S2CON &=0XFE;
aa=S2BUF; //接收从机状态
if((aa&&0x08)==0x08) //若命令未被接收
{
S2CON|=0x08; //把S2TB置1,复位
err();
}
else
{
if(command==0x01) //是发送命令
{
if((aa&0x01)==0x01) //从机已准备好接收
{
do
{
p=0; //清除校验和
for (i=0;i<bn;i++)
{
S2BUF=uart2_sBuf[i]; //发送一次数据
p+=uart2_sBuf[i];
while(!(S2CON&0X02));
S2CON&=0xfd;
}
S2BUF=p; //发送校验和
while(!(S2CON&0X02));
S2CON&=0xfd;
while(!(S2CON&0X01));
S2CON&=0xfe;
}while(S2BUF!=0);
S2CON|=0x08; //发复位信号
return(0);
}
}
else
{
if((aa&0x02)==0x02)
{
clearRbuf(); //清除接收缓存
while(1)
{
p=0;
for(i=0;i<bn;i++)
{
while(!(S2CON&0X01));
S2CON&=0xfe;
uart2_rBuf[i]=S2BUF;
p+=uart2_rBuf[i];
}
while(!(S2CON&0X01));
S2CON&=0xfe;
if(S2BUF==p)
{
S2BUF=0X00;
while(!(S2CON&0X02));
S2CON&=0xfd;
break;
}
else
{
S2BUF=0XFF;
while(!(S2CON&0X02));
S2CON&=0xfd;
}
}
S2CON|=0x08;
return(0);
}
else //从机没信息要发或者出错
{
clearRbuf();
S2CON|=0x08; //发复位信号
return(0);
}
}
}
}
}
}
从机接收程序:
//------------接收中断函数-----------------//
void receive() interrupt 8
{
uchar a;
S2CON &=0XFE;
IE2 =0X00; //关闭中断
//清除RI
if(S2BUF!=ID) //判断是否是本机地址
{ //不是本机地址,继续监听
IE2=0X01;
goto reti;
}
S2CON&=0XDF; //是本机地址,把SM2清零,接收数据
S2BUF=ID; //把本机地址发回主机校验
while(!(S2CON&0X02));
S2CON&=0XFD;
while((S2CON &0X01)!=1);
S2CON&=0XFE;
if((S2CON&0X04)==1) //判断RB8是否为1,为1,SM2=1,继续监听
{
S2CON|=0x20;
IE2=0X01;
goto reti;
}
a=S2BUF;
if(a==0x01) //是主机发数据给从机命令
{ //是否准备好接收数据
if(rready==1)
S2BUF=0X01;
else
S2BUF=0X00;
while(!(S2CON&0X02));
S2CON &= 0XFD;
// while((S2CON &0X01)!=1);
// S2CON &= 0XFE;
if((S2CON &0X04)==1)
{
S2CON|=0x20;
IE2=0X01;
goto reti;
}
sre(); //接收数据
}
else
{
if(a==0x02) //是从机发送数据给主机命令
{
if(tready==1)
S2BUF=0x02;
else
{
S2BUF=0X00;
S2CON|=0x20;
IE2=0X01;
goto reti;
}
while(!(S2CON &0X02));
S2CON &= 0XFD;
// while(!(S2CON &0X01));
// S2CON &= 0XFE;