24c16second.c

51单片机下的eeprom24c16的读写程序

#include<reg52.h>


//24c01-24c16读写驱动程序，

sbit a0=ACC^0;   //定义ACC的位，利用ACC操作速度最快
sbit a1=ACC^1;
sbit a2=ACC^2;
sbit a3=ACC^3;
sbit a4=ACC^4;
sbit a5=ACC^5;
sbit a6=ACC^6;
sbit a7=ACC^7;
sbit P2_5=P2^5;
sbit P2_4=P2^4;
#define scl P2_4
#define sda P2_5 


sbit dc=0xa0; /*P2.0 LCD 的RS 21*/
sbit rw=0xa1; /*P2.1 LCD 的R/W 22*/
sbit cs=0xa2; /*P2.2 LCD 的E 25*/
sfr lcdbus=0x90; /*p1LCD 数据 D0=P1.0*/


int dat[10];

void soft_nop(){}
void soft_10ms()//12MHZ 提供10MS 软件延时
{ register int i;
for(i=0;i<711;i++);
}
void soft_20ms()//12MHZ 提供20MS 软件延时
{ soft_10ms();
soft_10ms();
}



unsigned char data lcdcounter;
bit lcdusing1,lcdusing2;

bit lcd_checkbusy()/*检查LCD 忙*/
{ register lcdstate;
dc=0; /*dc=1为数据,=0 为命令.*/
rw=1; /*rw=1为读,=0为写.*/
cs=1; /*cs=1选通.*/
soft_nop();
lcdstate=lcdbus;
cs=0;
return((bit)(lcdstate&0x80));
}


void lcd_wrcmd(unsigned char lcdcmd) /*写LCD命令*/
{ lcdusing1=1;
while(lcd_checkbusy());
lcdbus=lcdcmd;
dc=0; /*dc=1为数据,=0 为命令.*/
rw=0; /*rw=1为读,=0为写.*/
cs=1; /*cs=1选通.*/
soft_nop();
cs=0;
lcdbus=0xff;
lcdusing1=0;
}


void lcd_moveto(char position) /*移动光标到指定位.0-79*/
{ register cmd=0x80;
lcdcounter=position;
if (position > 59)
position += 0x18;
else
{ if (position > 39)position -= 0x14;
else
{ if (position > 19)position += 0x2c;
}
}
cmd=cmd|position;
lcd_wrcmd(cmd);
}


void lcd_wrdata(char lcddata) /*在当前显示位置显示字符*/
{ //char i;
lcdusing2=1;
while(lcd_checkbusy());
if(lcdcounter==20){
lcd_moveto(20);
while(lcd_checkbusy());
}
if(lcdcounter==40){
lcd_moveto(40);
while(lcd_checkbusy());
}
if(lcdcounter==60){
lcd_moveto(60);
while(lcd_checkbusy());
}
if(lcdcounter==80){
lcd_moveto(0);
while(lcd_checkbusy());
lcdcounter=0;
} /*为通用而如此*/
lcdcounter++;
lcdbus=lcddata;
dc=1; /*dc=1为数据,=0 为命令.*/
rw=0; /*rw=1为读,=0为写.*/
cs=1; /*cs=1选通.*/
soft_nop();
cs=0;
lcdbus=0xff;
lcdusing2=0;
}


void lcd_string(char *strpoint) /*在当前显示位置显示LCD 字符串*/
{ register i=0;
while(strpoint[i]!=0){
lcd_wrdata(strpoint[i]);
i++;
}
}


void lcd_init()/*初始化*/
{ lcd_wrcmd(0x38); /*设置8 位格式,2行,5*7*/
lcd_wrcmd(0x0c); /*整体显示,关光标,不闪烁*/
lcd_wrcmd(0x06); /*设定输入方式,增量不移位*/
lcd_wrcmd(0x01); /*清除显示*/
lcdcounter=0;
}


void lcd_cls()/*清除显示*/
{ lcd_wrcmd(0x01);
lcdcounter=0;
}




void datadisplay(long  a)//显示变量数值（两位小数）
{int i;
 unsigned char b;
 if(a>=0)
 {for(i=9;i>=0;i--)
 {b=a%10; 
 if(i==7)
  {i--;
   dat[7]='.';
   }
 dat[i]=b+48;
  
  a/=10;
  }
  for(i=0;i<=9;i++)
  lcd_wrdata(dat[i]);
 }
 else
 {a=-a;
 for(i=9;i>=0;i--)
 {b=a%10; 
 if(i==7)
  {i--;
   dat[7]='.';
   }
 dat[i]=b+48;
  
  a/=10;
  }
  dat[0]='-';
 for(i=0;i<=9;i++)
  lcd_wrdata(dat[i]); 

 }

}

void nop()
{;}

void s24(void) {
 nop();scl=0;sda=1;scl=1;nop();sda=0;nop();scl=0;
}

void p24(void) {
 sda=0;scl=1;nop();sda=1;
}

unsigned char rd24(void) {
 sda=1;
 scl=1;a7=sda;scl=0;
 scl=1;a6=sda;scl=0;
 scl=1;a5=sda;scl=0;
 scl=1;a4=sda;scl=0;
 scl=1;a3=sda;scl=0;
 scl=1;a2=sda;scl=0;
 scl=1;a1=sda;scl=0;
 scl=1;a0=sda;scl=0;
 sda=1;scl=1;scl=0;
 return(ACC);
}

void wd24(unsigned char dd) {
 ACC=dd;
 sda=a7;scl=1;scl=0;
 sda=a6;scl=1;scl=0;
 sda=a5;scl=1;scl=0;
 sda=a4;scl=1;scl=0;
 sda=a3;scl=1;scl=0;
 sda=a2;scl=1;scl=0;
 sda=a1;scl=1;scl=0;
 sda=a0;scl=1;scl=0;
 sda=1;scl=1;
}

unsigned char read(unsigned int address){
 unsigned char dd;
 dd=((address&0x7ff)/256)<<1;
 s24();wd24(0xa0|dd);scl=0;wd24(address);scl=0;
 s24();wd24(0xa1|dd);scl=0;dd=rd24();p24();return(dd);
}

void write(unsigned int address,unsigned char dd){
 unsigned char ddd;
 ddd=((address&0x7ff)/256)<<1;
 s24();wd24(0xa0|ddd);scl=0;wd24(address);scl=0;wd24(dd);scl=0;p24();
 //time=0;     //time为定时器时间参考，time增加1代表1ms,如果没有用定时器，取消该行
 while (1) {
  s24();
  wd24(0xa0|ddd);
  sda=1;
  if (sda==0) break;
  //if (time>10) break; //此行防止由于eeprom器件损坏后的死循环
  scl=0;
 }
}



 void main(){unsigned char i=0;
 unsigned int a,j;
 i=read(0x01);

 i=50;
 write(0x01,i);	

 lcd_init();
 //while(1)
 datadisplay(i*100);
 for(j=250;j>0;j--)
{soft_10ms();}

//lcd_wrdata(i);


}