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#include <iic.H>
#include <STC15F2K60S2.H>
#include <intrins.H> //該頭文件是包含nop（）的頭文件
#define DELAY_TIME 5
sbit scl=P2^0;
sbit sda=P2^1;
//
static void I2C_Delay(unsigned char n)
{
do
{
_nop_();
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();_nop_();
}
while(n--);
}
//
void I2CStart(void)
{
sda = 1;
scl = 1;
I2C_Delay(DELAY_TIME);
sda = 0;
I2C_Delay(DELAY_TIME);
scl = 0;
}
//
void I2CStop(void)
{
sda = 0;
scl = 1;
I2C_Delay(DELAY_TIME);
sda = 1;
I2C_Delay(DELAY_TIME);
}
//
void I2CSendByte(unsigned char byt)
{
unsigned char i;
for(i=0; i<8; i++)
{
scl = 0;
I2C_Delay(DELAY_TIME);
if(byt & 0x80) sda = 1;
else sda = 0;
I2C_Delay(DELAY_TIME);
scl = 1;
byt <<= 1;
I2C_Delay(DELAY_TIME);
}
scl = 0;
}
//
unsigned char I2CReceiveByte(void)
{
unsigned char da;
unsigned char i;
for(i=0;i<8;i++)
{
scl = 1;
I2C_Delay(DELAY_TIME);
da <<= 1;
if(sda)
da |= 0x01;
scl = 0;
I2C_Delay(DELAY_TIME);
}
return da;
}
//
unsigned char I2CWaitAck(void)
{
unsigned char ackbit;
scl = 1;
I2C_Delay(DELAY_TIME);
ackbit = sda;
scl = 0;
I2C_Delay(DELAY_TIME);
return ackbit;
}
//
void I2CSendAck(unsigned char ackbit)
{
scl = 0;
sda = ackbit;
I2C_Delay(DELAY_TIME);
scl = 1;
I2C_Delay(DELAY_TIME);
scl = 0;
sda = 1;
I2C_Delay(DELAY_TIME);
}
//EEPROM寫(xiě)函數(shù)
void EEPROM_Write(unsigned char* EEPROM_String,unsigned char addr,num)
{
I2CStart();
I2CSendByte(0xa0);
I2CWaitAck();
I2CSendByte(addr);
I2CWaitAck();
while(num--)
{
I2CSendByte(* EEPROM_String++);
I2CWaitAck();
I2C_Delay(200);
}
I2CStop();
}
//EEPROM讀函數(shù)
void EEPROM_Read(unsigned char* EEPROM_String,unsigned char addr,num)
{
I2CStart();
I2CSendByte(0xa0);
I2CWaitAck();
I2CSendByte(addr);
I2CWaitAck();
I2CStart();
I2CSendByte(0xa1);
I2CWaitAck();
while(num--)
{
*EEPROM_String = I2CReceiveByte();
if(num > 1)
I2CSendAck(0); // Send ACK if more bytes are to be read
else
I2CSendAck(1); // Send NACK if it's the last byte
EEPROM_String++;
}
I2CStop();
}

復(fù)制代碼