狠狠心 拿出100分问个问题关于AT24c02d的连续读写问题
查了很多资料 原理也弄明白了 也按照原理写了个程序 可是输出的结果一点都不靠谱 还请各位帮忙看一下 问题出在什么地方
明白的人 一看就知道 程序很简单
#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
sbit SDA=P2^0;
sbit SCL=P2^1;
sbit dula = P2^6;
sbit wela = P2^7;
sbit key = P3^4;
uchar code table[16] = {
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71
};
uchar shuju[8];
uchar num,time;
void delayms(unsigned int i){
unsigned char j;
for(; i > 0; i--)
for(j = 110; j > 0; j--)
;
}
void show(){//显示time变量 分别是百十个位
dula = 1;
P0 = table[time / 100];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfe;
wela = 0;
delayms(5);
dula = 1;
P0 = table[time / 10 % 10];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfd;
wela = 0;
delayms(5);
dula = 1;
P0 = table[time % 10];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfb;
wela = 0;
delayms(5);
}
void IIC_init(){//初始化
SCL = 1;
_nop_();
SDA = 1;
_nop_();
}
void IIC_start(){//开始
SDA = 1;
_nop_();
SCL = 1;
_nop_();
SDA = 0;
_nop_();
}
void IIC_ask(){//应答
uchar i;
SCL = 1;
_nop_();
while((SDA == 1) && (i < 255))
i++;
SCL = 0;
_nop_();
}
void IIC_stop(){//停止
SDA = 0;
_nop_();
SCL = 1;
_nop_();
SDA = 1;
_nop_();
}
void IIC_write(uchar date){
uchar temp,i;
temp = date;
for(i = 0; i < 8; i++){
temp = temp << 1;
SCL = 0;
_nop_();
SDA = CY;
_nop_();
SCL = 1;
_nop_();
}
SCL = 0;
_nop_();
SDA = 1;
_nop_();
}
unsigned char IIC_read(){
uchar i,date;
SCL = 0;
_nop_();
SDA = 1;
_nop_();
for(i = 0; i < 8; i++){
SCL = 1;
_nop_();
date = (date<<1)|SDA;
SCL = 0;
_nop_();
}
_nop_();
return date;
}
void At24c02_write(uchar address){//连续写
uchar i;
IIC_start();
IIC_write(0xa0);
IIC_ask();
IIC_write(address);
IIC_ask();
for(i = 0; i < 8; i++){
IIC_write(i);
IIC_ask();
}
IIC_stop();
}
void At24c02_read(uchar address){//连续读
uchar i;
IIC_start();
IIC_write(0xa0);
IIC_ask();
IIC_write(address);
IIC_ask();
delayms(100);
IIC_start();
IIC_write(0xa1);
IIC_ask();
for(i = 0; i < 8; i++){//从地址依次读取8个数据
shuju[i] = IIC_read();
IIC_ask();
}
IIC_stop();
}
void main(){
uchar i;
IIC_init();
At24c02_write(2);
delayms(100);
At24c02_read(2);
for(i = 0; i < 8; i++){
time = shuju[i];
show();
while(key)//按下按钮继续显示下一个数据
;
delayms(10);
while(!key)
;
}
while(1)
;
}
