EEPROM写入（电开）

emmmm我说那个玩意我做了四天然后砍掉了，重新做了个，终于今天搞完了
上传这玩意也不知道该讲点啥，金沙滩什么讲的挺清楚地，放一个页写入的文件吧
eeprom.c
#include<reg52.h>

extern void I2CStart();
extern void I2CStop();
extern unsigned char I2CReadACK();
extern unsigned char I2CReadNAK();
extern bit I2CWrite(unsigned char dat);

void E2Read(unsigned char *buf,unsigned char addr,unsigned char len)
{
do{
I2CStart();
if(I2CWrite(0x51<<1))
{
break;
}
I2CStop();
}while(1);
I2CWrite(addr);
I2CStart();
I2CWrite((0x51<<1)|0x01);
while(len>1)
{
*buf++ = I2CReadACK();
len--;
}
*buf = I2CReadNAK();
I2CStop();
}

void E2Write(unsigned char *buf,unsigned char addr,unsigned char len)
{
while(len>0)
{
do{
I2CStart();
if(I2CWrite(0x51<<1))
{
break;
}
I2CStop();
}while(1);
I2CWrite(addr);
while(len>0)
{
I2CWrite(*buf++);
len--;
addr++;
if((addr&0x07) == 0)
{
break;
}
}
I2CStop();
}
}


I2C.c
#include<reg52.h>
#include<intrins.h>

#define I2CDelay(){_nop_();_nop_();_nop_();_nop_();}

sbit SCL = P3^6;
sbit SDA = P3^7;

void I2CStart()
{
SDA = 1;
SCL = 1;
I2CDelay();
SDA = 0;
I2CDelay();
SCL = 0;
}

void I2CStop()
{
SDA = 0;
SCL = 0;
I2CDelay();
SCL = 1;
I2CDelay();
SDA = 1;
I2CDelay();
}

bit I2CWrite(unsigned char dat)
{
bit ack;
unsigned char mask;

for(mask = 0x80;mask != 0;mask>>=1)
{
if((mask&dat) == 0)
SDA = 0;
else
SDA = 1;
I2CDelay();
SCL = 1;
I2CDelay();
SCL = 0;
}
SDA = 1;
I2CDelay();
SCL = 1;
ack = SDA;
I2CDelay();
SCL = 0;
return (~ack);
}

unsigned char I2CReadNAK()
{
unsigned char mask;
unsigned char dat;

SDA = 1;
for(mask = 0x80;mask!=0;mask>>=1)
{
I2CDelay();
SCL = 1;
if(SDA == 0)
dat&=~mask;
else
dat|=mask;
I2CDelay();
SCL = 0;
}
SDA = 1;
I2CDelay();
SCL = 1;
I2CDelay();
SCL = 0;
return dat;
}

unsigned char I2CReadACK()
{
unsigned char mask;
unsigned char dat;

SDA = 1;
for(mask = 0x80;mask!=0;mask>>=1)
{
I2CDelay();
SCL = 1;
if(SDA == 0)
dat&=~mask;
else
dat|=mask;
I2CDelay();
SCL = 0;
}
SDA = 0;
I2CDelay();
SCL = 1;
I2CDelay();
SCL = 0;
return dat;
}



main.c
#include<reg52.h>

extern void InitLcd1602();
extern void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str);
extern void E2Read(unsigned char *buf,unsigned char addr,unsigned char len);
extern void E2Write(unsigned char *buf,unsigned char addr,unsigned char len);
void MemToStr(unsigned char *str,unsigned char *src,unsigned char len);

void main()
{
unsigned char i;
unsigned char buf[5];
unsigned char str[20];

InitLcd1602();
E2Read(buf,0x90,sizeof(buf));
MemToStr(str,buf,sizeof(buf));
LcdShowStr(0,0,str);
for(i = 0;i<sizeof(buf);i++)
{
buf[i] = buf[i]+1+i;
}
E2Write(buf,0x90,sizeof(buf));

while(1);
}

void MemToStr(unsigned char *str,unsigned char *src,unsigned char len)
{
unsigned char tmp;
while(len--)
{
tmp = *src>>4;
if(tmp<=9)
*str++ = tmp+'0';
else
*str++ = tmp-10+'A';
tmp = *src&0x0F;
if(tmp<=9)
*str++ = tmp+'0';
else
*str++ = tmp-10+'A';
*str++ = ' ';
src++;
}
*str = '\0';
}