//Name: I2C standard program
//Author: Ares
//Date:
#i nclude
#i nclude
sbit SDA=P2^5;
sbit SCL=P1^0;
#define uchar unsigned char
#define uint unsigned int
#define byte unsigned char
void delay()
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}
void delayms (uint x)
{
byte j;
while(x--){
}
void I2C_Start()
{
SDA=1;
_nop_();
SCL=1;
delay();
SCL=0;
_nop_();
}
void I2C_Stop()
{
SDA=0;
_nop_();
SCL=1;
delay();
SDA=1;
delay();
}
bit I2C_ReceiveAck()
{
bit ck;
SDA=1;
_nop_();
_nop_();
SCL=1;
_nop_();
_nop_();
ck=SDA;
_nop_();
_nop_();
SCL=0;
_nop_();
return(ck);
}
void I2C_SendAck()
{
SDA=0;
_nop_();
_nop_();
SCL=1;
delay();
SCL=0;
_nop_();
_nop_();
}
void I2C_SendNoAck()
{
SDA=1;
_nop_();
_nop_();
SCL=1;
delay();
SCL=0;
_nop_();
_nop_();
}
void I2C_SendByte(byte SData)
{uchar i;
for(i=0;i<8;i++)
{ SDA=(bit)(SData&0x80);
}
}
byte I2C_ReceiveByte()
{uchar i;
byte RData;
RData=0;
for(i=0;i<8;i++)
{ SDA=1;
_nop_();
SCL=1;
_nop_();
_nop_();
RData=RData<<1;
RData=RData|SDA;
_nop_();
_nop_();
SCL=0;
}
return(RData);
}
void I2C_SendToSubAddress(byte SlaveAddress,byte SubAddress,byte *pSData,uchar N)
{uchar i;
I2C_Start();
I2C_SendByte(SlaveAddress);
I2C_ReceiveAck();
I2C_SendByte(SubAddress);
I2C_ReceiveAck();
for(i=0;i
I2C_SendByte(pSData[i]);
I2C_ReceiveAck();
}
I2C_Stop();
}
void I2C_ReceiveFromSubAddress(byte SlaveAddress,byte SubAddress,byte *pRData,uchar N)
{uchar i;
I2C_Start();
I2C_SendByte(SlaveAddress);
I2C_ReceiveAck();
I2C_SendByte(SubAddress);
I2C_ReceiveAck();
I2C_Start();
I2C_SendByte(SlaveAddress+1);
I2C_ReceiveAck();
for(i=0;i
}
pRData[i]=I2C_ReceiveByte();
I2C_SendNoAck();
I2C_Stop();
}
main()
{byte *pData;
byte a[16]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
pData=a;
I2C_ReceiveFromSubAddress(0xA0,0x20,pData,16);
I2C_SendToSubAddress(0xA0,0,pData,16);
}
上一篇:AVR相比51系列单片机的优势特征
下一篇:单片机c语言中code的用法
推荐阅读最新更新时间:2024-03-16 14:48