51单片机摸拟串口(232)
F_TM=0;
while(!F_TM);
ACC1=BT_REC;
F_TM=0;
while(!F_TM);
ACC2=BT_REC;
F_TM=0;
while(!F_TM);
ACC3=BT_REC;
F_TM=0;
while(!F_TM);
ACC4=BT_REC;
F_TM=0;
while(!F_TM);
ACC5=BT_REC;
F_TM=0;
while(!F_TM);
ACC6=BT_REC;
F_TM=0;
while(!F_TM);
ACC7=BT_REC;
F_TM=0;
while(!F_TM)
{
if(BT_REC)
{
break;
}
}
TIMER0_DISABLE;//停止timer
returnACC;
#else
unsignedcharrch,ii;
TIMER0_ENABLE;
F_TM=0;
ii=0;
rch=0;
while(!F_TM);//等过起始位
while(ii<8)
{
rch>>=1;
if(BT_REC)
{
rch|=0x80;
}
ii++;
F_TM=0;
while(!F_TM);
}
F_TM=0;
while(!F_TM)
{
if(BT_REC)
{
break;
}
}
TIMER0_DISABLE;//停止timer
returnrch;
#endif
}
//检查是不是有起始位
bit StartBitOn()
{
return(BT_REC==0);
}
voidmain()
{
unsignedchargch;
TMOD=0x22;
PCON=00;
TR0=0;//在发送或接收才开始使用
TF0=0;
//TH0=(256-96);
TH0=(256-197);
//9600bps 就是 1000000/9600=104.167微秒 执行的timer是
//
//104.167*11.0592/12= 96
TL0=TH0;
ET0=1;
EA=1;
PSendChar(0x55);
PSendChar(0xaa);
PSendChar(0x00);
PSendChar(0xff);
while(1)
{
p=gch;
for(i=0;i<8;i++)
{if(StartBitOn())
{*p=PGetChar();
PSendChar(*p);
p++;
}
}
}
}
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