单片机iic是做什么的？ 单片机iic程序不懂给分析下啊
\u4ec0\u4e4851\u5355\u7247\u673a\u578b\u53f7\u652f\u6301iic\uff1f\u5927\u90e8\u520651\u5355\u7247\u673a\u90fd\u4e0d\u652f\u6301iic\uff0c\u597d\u8c61\u53ea\u6709C8051F410\u7cfb\u5217\u652f\u6301\uff0c\u4f30\u8ba1\u8fd9\u4e2a\u82af\u7247\u4e0d\u4fbf\u5b9c
\u4e00\u822c\u90fd\u7528\u666e\u901aIO\u5f15\u811a\u6765\u6a21\u62dfiic\u603b\u7ebf\u65f6\u5e8f
\u8d34\u4e2a\u7a0b\u5e8f\u7ed9\u4f60\u770b\u770b\uff0c\uff0c\uff0c\u5355\u7247\u673a\u6ca1\u6709I2C\u603b\u7ebf\u63a5\u53e3\uff0c\u53ea\u80fd\u9760\u8f6f\u4ef6\u6a21\u62df
/*\u7a0b\u5e8f\u7684I2C\u4ece\u5668\u4ef6\u5730\u5740\u4e3a1010\uff0c\u7247\u9009\u5730\u5740\u4e3a000*/
#include
#include
#define uchar unsigned char
#define uint unsigned int
sbit SDA=P1^7;
sbit SCL=P1^6;
void Delay(uint us)
{
for(us;us>0;us--);
}
void start_iic() // \u542f\u52a8I2C\u603b\u7ebf
{
SDA=1; // \u53d1\u9001\u8d77\u59cb\u6761\u4ef6\u6570\u636e\u4fe1\u53f7\uff0c\u542f\u52a8\u65f6\uff0c
SCL=1; // \u5fc5\u9700\u4f7f\u6570\u636e\u7ebf\u3001\u65f6\u949f\u4fe1\u53f7\u7ebf\u5904\u4e8e\u9ad8\u7535\u5e73\uff08\u7a7a\u95f2\u6001\uff09
Delay(10); // \u4f7f\u7528I2C\u603b\u7ebf\u5fc5\u9700\u8003\u8651\u4fdd\u6301\u65f6\u95f4\u548c\u5efa\u7acb\u65f6\u95f4\uff0c\u6545\u5ef6\u65f6
SDA=0; //\u4ea7\u751f\u4e0b\u964d\u6cbf\uff0c\u53d1\u9001\u8d77\u59cb\u4fe1\u53f7
Delay(10);
SCL=0;
}
void stop_iic()
{
SDA=0; //\u4e3a\u4ea7\u751f\u4e0a\u8df3\u6cbf\u505a\u51c6\u5907
SCL=1; //\u6253\u5f00\u65f6\u949f\u7ebf
Delay(10);
SDA=1; //\u4ea7\u751f\u505c\u6b62\u4fe1\u53f7\uff08\u4e0a\u8df3\u6cbf\u6709\u6548\uff09
Delay(10);
SCL=0; //\u65f6\u949f\u7ebf\u6062\u590d\u65e0\u6548\u6001//
}
void ack_iic()
{
SDA=0;// \u63a5\u53d7\u5668\u4ef6\u53d1\u9001\u5e94\u7b54\u4fe1\u53f7
SCL=1;
Delay(10);
SCL=0;
SDA=1;//\u5e94\u7b54\u4fe1\u53f7\u4f4e\u7535\u5e73\u6709\u6548\uff0c\u6545\u9700\u5c06\u5176\u91cd\u65b0\u7f6e\u9ad8\u7535\u5e73
}
void nack_iic()
{
SDA=1; //\u4e3b\u5668\u4ef6\u53d1\u975e\u5e94\u7b54\u4fe1\u53f7\uff0c\u901a\u77e5AT24C08\u4e0d\u518d\u53d1\u9001\u6570\u636e
SCL=1;
Delay(10);
SCL=0;
SDA=0; //\u975e\u5e94\u7b54\u4fe1\u53f7\u9ad8\u7535\u5e73\u6709\u6548\uff0c\u6545\u9700\u5c06\u5176\u91cd\u65b0\u7f6e\u4f4e\u7535\u5e73
}
Write_byte(uchar c)
{
uchar i;
for(i=0;i<8;i++)
{
if(c&0x80)SDA=1;
else SDA=0;
SCL=1;
Delay(10);
SCL=0;//\u56e0\u4e3a\u5f53\u65f6\u949f\u7ebf\u6709\u6548\u662f\uff0c\u6570\u636e\u7ebf\u5fc5\u987b\u4fdd\u6301\u7a33\u5b9a\u7684\u7535\u5e73\uff0c
c=c<<1;//\u8981\u6539\u53d8SDA\u7535\u5e73\uff0c\u5e94\u5148\u5c06SCL\u62c9\u4f4e
}
SDA=1;//\u91ca\u653eI2C\u603b\u7ebf\uff0c\u51c6\u5907\u63a5\u53d7\u5e94\u7b54\u4fe1\u53f7
SCL=1;
Delay(10);
if(SDA==1)F0=0;//\u6ca1\u6709\u63a5\u5230\u5e94\u7b54\u4f4d
else F0=1;
SCL=0;
}
uchar Read_byte()
{
uchar i;
uchar r=0;
SDA=1; //\u7f6e\u6570\u636e\u7ebf\u4e3a\u8f93\u5165\u65b9\u5f0f
for(i=0;i<8;i++)
{
r=r<<1;
SCL=1;
Delay(10); //\u4fdd\u8bc1\u4e00\u5b9a\u7684\u7535\u5e73\u4fdd\u6301\u65f6\u95f4
if(SDA==1)r++; //\u4ece\u9ad8\u4f4d\u5f00\u59cb\uff0c\u4e00\u4f4d\u4e00\u4f4d\u7684\u8bfb
SCL=0;
}
return r;
}
main()
{
uchar slave=0xa0;//I2C\u603b\u7ebf\u4ece\u5668\u4ef6\u5730\u5740\uff08\u6ce8\u610f\uff1a\u786c\u4ef6\u7535\u8def\u7684\u63a5\u6cd5\u8981\u662f\u7247\u9009\u5730\u5740\u4e3a0\uff0c\u5426\u5219\u4e0d\u80fd\u5de5\u4f5c\uff09
uchar Rslave=slave+1;//\u4e3b\u5668\u4ef6\u53d1\u9001\u8bfb\u63a7\u5236\u5b57\u5b57\u8282
uchar addre=0x20;// \u6307\u5b9a\u7684\u5199\u6570\u636e\u5730\u5740
uchar wbuf=0x23;//\u5c06\u8981\u5199\u8fdbaddre\u7684\u6570\u636e
uchar rbuf;//\u5b58\u653e\u8bfb\u51fa\u7684\u6570\u636e\u7684\u4e34\u65f6\u53d8\u91cf
start_iic();//\u4ea7\u751f\u8d77\u59cb\u4fe1\u53f7
Write_byte(slave); //\u53d1\u9001\u4ece\u5668\u4ef6\u5730\u5740
if(F0==0)return 0; //\u68c0\u67e5\u5e94\u7b54\u4f4d
Write_byte(addre); //\u53d1\u9001\u76ee\u7684\u5730\u5740
if(F0==0)return 0;
Write_byte(wbuf); //\u53d1\u90018\u4e3a\u6570\u636e
if(F0==0)return 0;
stop_iic(); //\u505c\u6b62\u4fe1\u53f7
/*8\u4f4d\u7684\u6570\u636e\u53d1\u9001\u5b8c\u6bd5*/
Delay(1000);
start_iic();
Write_byte(slave);
if(F0==0)return 0;
Write_byte(addre);
if(F0==0)return 0;
start_iic();//\u518d\u6b21\u4ea7\u751f\u8d77\u59cb\u4fe1\u53f7\uff0c\u4e0d\u80fd\u5c11
Write_byte(Rslave);//\u9001\u8bfb\u63a7\u5236\u5b57
if(F0==0)return 0;
rbuf=Read_byte();//\u8bfb\u51fa\u6307\u5b9a\u5355\u5143\u7684\u5185\u5bb9
nack_iic();//\u975e\u5e94\u7b54\u4fe1\u53f7
stop_iic();
/*8\u4f4d\u7684\u6570\u636e\u8bfb\u53d6\u5b8c\u6bd5*/
TMOD=0x20; //\u4e32\u53e3\u8c03\u8bd5
TL1=0xfd;
TH1=0xfd;
SCON=0x40;
PCON=0x00;
TR1=1;
while(1)
{
SBUF=rbuf; //\u653e\u5165\u7f13\u51b2
while(TI==0);
TI=0;
Delay(10000);
}
}
硬件IIC比模拟IIC速度更快，但是接口固定，并不是一个好选择。用来学习还是不错。
I2C是个串行半双工的同学协议，与串口通信类似
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