1602斷電后再送電不能實現，請各位大佬幫忙指點一下小弟，錯在哪里？
#include<reg52.h> //頭文件
#include<intrins.h> //頭文件
#define uchar unsigned char //宏定義
#define uint unsigned int //宏定義
uchar code table[]="I LOVE DIANZI"; //定義編碼
uchar code table1[]=" ABCD "; //定義編碼
uchar code table2[]="DIANZI LOVE I"; //定義編碼
uchar code table3[]=" DCBA "; //定義編碼
uchar num,sec,sce,tcnt;
sbit key1 = P3^0; //按鍵一
sbit key2 = P3^1; //按鍵二
sbit key3 = P3^2; //按鍵三
sbit key4 = P3^3; //按鍵四
/* sbit key5 = P3^4;
sbit key6 = P3^5;
sbit key7 = P3^6;
sbit key8 = P3^7;*/
sbit sda = P2^0; //24c02數據
sbit scl = P2^1; //24c02時鐘
bit write = 0; //寫24c02的標志
/*sbit led1 = P0^0;
sbit led2 = P0^1;
sbit led3 = P0^2;
sbit led4 = P0^3; */
sbit lcdrs = P2^6; //1602數據/命令
sbit lcdwr = P2^5; //1602寫/讀
sbit lcden = P2^7; //1602使能
void delay1s(uint z) //延時
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void delay() //延時
{;;}
void at_start() //24c02開始
{
sda = 1;
delay();
scl = 1;
delay();
sda = 0;
delay();
}
void at_stop() //24c02結束
{
sda = 0;
delay();
scl = 1;
delay();
sda = 1;
delay();
}
void at_respons() //24c02應答
{
uchar i;
scl = 1;
delay();
while((sda==1)&&(i<255))i++;
scl = 0;
delay();
}
void at_init() //24c02初始化
{
sda = 1;
delay();
scl = 1;
delay();
}
void at_write_byte(uchar date) //24c02寫一個字節
{
uchar i,temp;
temp =date;
for(i=0;i<8;i++)
{
temp=temp<<1;
scl = 1;
delay();
sda = CY;
delay();
scl = 1;
delay();
}
scl = 0;
delay();
sda = 1;
delay();
}
uchar at_read_byte() //24c02讀一個字節
{
uchar i,k;
scl = 0;
delay();
sda = 1;
delay();
for(i=0;i<8;i++)
{
scl = 1;
delay();
k = (k<<1)|sda;
scl = 0;
delay();
}
return k;
}
void at_write_add(uchar address,uchar date) //24c02任意地址寫字節
{
at_start();
at_write_byte(0xa0);
at_respons();
at_write_byte(address);
at_respons();
at_write_byte(date);
at_respons();
at_stop();
delay1s(5);
}
uchar at_read_add(uchar address) //24c02任意地址讀字節
{
uchar date;
at_start();
at_write_byte(0xa0);
at_respons();
at_write_byte(address);
at_respons();
at_start();
at_write_byte(0xa1);
at_respons();
date=at_read_byte();
at_stop();
delay1s(5);
return date;
}
bit lcd_busy() //1602忙標志
{
bit result;
lcdrs = 0;
lcdwr = 1;
lcden = 1;
delay();
delay();
delay();
result=(bit)(P0&0x80);
lcden = 0;
return(result);
}
void lcd_send_com(uchar com) //1602命令
{
while(lcd_busy());
lcdrs = 0;
lcdwr = 0;
P0 = com;
delay1s(5);
lcden = 1;
delay1s(5);
lcden = 0;
}
void lcd_send_data(uchar date) //1602寫數據
{
while(lcd_busy());
lcdrs = 1;
lcdwr = 0;
P0 = date;
delay1s(5);
lcden=1;
delay1s(5);
lcden=0;
}
void lcd_init() //1602初始化
{
lcden = 0;
lcdrs = 0;
lcdwr = 0;
lcd_send_com(0x38);
lcd_send_com(0x0c);
lcd_send_com(0x06);
lcd_send_com(0x01);
}
uchar keyscan() //鍵查詢
{
if(key1==0)
{
delay1s(5);
if(key1==0)
{
return 1;
/* lcd_send_com(0x80);
for(num = 0;num<13;num++)
{
lcd_send_data(table[num]);
delay1s(5);
}*/
}
while(!key1);
}
else if(key2==0)
{
delay1s(5);
if(key2==0)
{
return 2;
}
while(!key2);
}
else if(key3==0)
{
delay1s(5);
if(key3==0)
{
return 3;
}
while(!key3);
}
else if(key4==0)
{
delay1s(5);
if(key4==0)
{
return 4;
}
while(!key4);
}
return 0;
}
void displaychar(uchar n) //1602顯示
{
switch(n)
{
case 1:
lcd_send_com(0x80);
for(num = 0;num<13;num++)
{
lcd_send_data(table[num]);
delay1s(5);
} break;
case 2:
lcd_send_com(0x80+40);
for(num = 0;num<11;num++)
{
lcd_send_data(table1[num]);
delay1s(5);
} break;
case 3:
lcd_send_com(0x80);
for(num = 0;num<11;num++)
{
lcd_send_data(table2[num]);
delay1s(5);
} break;
case 4:
lcd_send_com(0x80+40);
for(num = 0;num<11;num++)
{
lcd_send_data(table3[num]);
delay1s(5);
} break;
default: break;
}
}
void main() //主程序
{
at_init();
lcd_init();
sec=at_read_add(23); //將24c02讀數據賦值給sec
lcd_send_com(0x80); //指針位置
lcd_send_data(sec); //1602寫數據
while(1)
{
displaychar(keyscan()); //1602顯示內容
sec= keyscan(); //將按鍵返回值賦值給sec
at_write_add(23,sec);delay1s(5); //將在24c02存儲器23位存儲數據sec的值
}
}
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