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標(biāo)題: eeprom程序有問題高手指點 [打印本頁]

作者: LY新手上路 時間: 2011-9-20 10:02
標(biāo)題: eeprom程序有問題高手指點

eeprom程序（寫0xaa到eeprom在讀出來給流水燈）為什么不論寫啥只有一個燈亮而且是在程序燒進(jìn)去很長時間

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
#define nop() _nop_()
sbit sclk=P2^0;
sbit sda=P2^1;
char temp;
void delay();
void delay1(uint z);
void init();
void start();
void stop();
void respond();
void write_byte(uchar byte);
uchar read_byte();
void write_eeprom(uchar add,uchar date);
uchar read_eeprom(uchar add);

void main()
{
init();
write_eeprom(1,0xaa);
delay1(100);
temp=read_eeprom(1);
P0=temp;
while(1);
}
void delay()
{
nop();
nop();
nop();
nop();
nop();
}
void delay1(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=123;y>0;y--);
}
void init()
{
sclk=1;
delay();
sda=1;
delay();
}
void start()
{
sda=1;
delay();
sclk=1;
delay();
sda=0;
delay();
}
void stop()
{
sda=0;
delay();
sclk=1;
delay();
sda=1;
delay();
}
void respond()
{
uchar i;
sclk=1;
delay();
while((sda==1)&&(i<250))i++;
sclk=0;
delay();
}
void write_byte(uchar byte)
{
uint i;
uchar temp;
temp=byte;
for(i=0;i<8;i--)
{
temp=temp<<1;
sclk=0;
delay();
sda=CY;
delay();
sclk=1;
delay();
}
sclk=0;
delay();
sda=1;
delay();
}
uchar read_byte()
{
uint i;
uchar temp;
temp=0;
sclk=0;
delay();
sda=1;
delay();
for(i=0;i<8;i--)
{
sclk=1;
if(sda==1)
temp=temp|0x01;
temp=temp<<1;
sclk=0;
delay();
}
return temp;

}
void write_eeprom(uchar add,uchar date)
{
start();
write_byte(0xa0);
respond();
write_byte(add);
respond();
write_byte(date);
respond();
stop();
}
uchar read_eeprom(uchar add)
{
uchar date;
start();
write_byte(0xa0);
respond();
write_byte(add);
respond();
start();
write_byte(0xa1);
respond();
date=read_byte();
stop();
return date;
}

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