㈠ 2个51单片机怎么实现通过1—wire单总线通信最好有借鉴的代码。
用STC的吧，带SPI总线，我都用这个比较好用，单线的你不是要接到从机的外部中断口了。单线比较烦，共地的话你可以这样干。主机将信号线拉低，从机进主中断程序，定义一个长延时为同步头，然后主机移位传送数据，定义一个长延时结束。最好不要单总线通信，烦的呢
㈡ STC单片机的3线（+12V COM GND）单总线通讯，要求通讯距离100米，怎么做呢
我有一种方案 只用2线就可以，只需要+12V GND就可以，直接在电源线通信，既供电又通信。网络来信
㈢ 单片机的通信方式有那些
单片机是一种集成在电路芯片，是采用超大规模集成电路技术把具有数据处理能力的中央处理器CPU随机存储器RAM、只读存储器ROM、多种I/O口和中断系统、定时器/计时器等功能（可能还包括显示驱动电路、脉宽调制电路、模拟多路转换器、A/D转换器等电路）集成到一块硅片上构成的一个小而完善的计算机系统。 51 单片机内部有一个全双工串行接口。什么叫全双工串口呢？一般来说，只能接受或只能发送的称为单工串行；既可接收又可发送，但不能同时进行的称为半双工；能同时接收和发送的串行口称为全双工串行口。串行通信是指数据一位一位地按顺序传送的通信方式，其突出优点是只需一根传输线，可大大降低硬件成本，适合远距离通信。其缺点是传输速度较低。
㈣ at89c52单片机可以通过普通IO口实现一线通信吗求通信程序！
/*合泰单片机*/
#defineDATA_pa6
unsignedcharnub[5]={0x01,0x0b,0xfe,0xcd,0xee};
unsignedcharReceive[10]={0x00};
unsignedcharReceivetime;
unsignedcharReceiveBF=0x00;
unsignedcharReceivecount=0x00;
unsignedcharReceiveC=0x00;
void__attribute((interrupt(0x10)))isr_time(void)//100us定时器中断函数
{
_ptma0f=0;
switch(ReceiveBF)
{
case0x00://引导码低
{
if(DATA)
{
if(Receivetime>85)
{
if(Receivetime<100)
{
ReceiveBF=0x01;
Receivetime=0x00;
}
else
{
ReceiveBF=0x00;
Receivetime=0x00;
}
}
else
{
ReceiveBF=0x00;
Receivetime=0x00;
}
}
else
{
Receivetime++;
}
break;
}
case0x01://引导码高
{
if(DATA)
{
Receivetime++;
}
else
{
if(Receivetime>40)
{
if(Receivetime<55)
{
ReceiveBF=0x02;
Receivetime=0x00;
Receivecount=0x00;
ReceiveC=0x00;
}
else
{
ReceiveBF=0x00;
Receivetime=0x00;
}
}
else
{
ReceiveBF=0x00;
Receivetime=0x00;
}
}
break;
}
case0x02://低电平
{
if(DATA)
{
if(Receivetime>10)//数据
{
if(Receivetime<25)
{
ReceiveBF=0x03;
Receivetime=0x00;
}
else
if(Receivetime<55)
{
ReceiveBF=0x04;
Receivetime=0x00;
}
}
}
else
{
Receivetime++;
}
break;
}
case0x03://数据码
{
if(DATA)
{
Receivetime++;
}
else
{
if(Receivetime>25)//1
{
Receive[ReceiveC]=Receive[ReceiveC]<<1;
Receive[ReceiveC]=Receive[ReceiveC]|0x01;
Receivecount++;
if(Receivecount==8)
{
Receivecount=0x00;
ReceiveC++;
}
ReceiveBF=0x02;
Receivetime=0x00;
}
else//0
{
Receive[ReceiveC]=Receive[ReceiveC]<<1;
Receive[ReceiveC]=Receive[ReceiveC]&0xfe;
Receivecount++;
if(Receivecount==8)
{
Receivecount=0x00;
ReceiveC++;
}
ReceiveBF=0x02;
Receivetime=0x00;
}
}
break;
}
case0x04://结束码
{
ReceiveBF=0x00;
Receivetime=0x00;
break;
}
}
}
voidSend()
{
volatileunsignedcharcount=0x05;
volatileunsignedchardatanub;
volatileunsignedchardatacount;
//引导码
DATA=0;
dly100us(90);
DATA=1;
dly100us(45);
//数据码
while(count)
{
datanub=nub[5-count];
datacount=0x08;
while(datacount)
{
if(datanub&0x80)
{
DATA=0;
dly100us(15);
DATA=1;
dly100us(30);
}
else
{
DATA=0;
dly100us(15);
DATA=1;
dly100us(15);
}
datanub=datanub<<1;
datacount--;
}
count--;
}
//结束码
DATA=0;
dly100us(45);
DATA=1;
dly100us(45);
DATA=0;
dly100us(45);
DATA=1;
}