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51單片機(jī)-AT24C

作者：時間：2016-12-02 來源：網(wǎng)絡(luò)

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寫入EEPROM一個2，然后讀出，在數(shù)碼管上顯示出來: #include ＜reg52.h＞

#define uchar unsigned char

#define uint unsigned int

sbit SCL = P3^6;

sbit SDA = P3^7;

void delay()

{ ;; } //5us

void delay1(uchar x)

{

uchar a,b;

for(a=x;a＞0;a--)

for(b=100;b＞0;b--);

}

void Init(){

SCL = 1;

SDA = 1;

}

void start(){

SDA = 1;

delay();

SCL = 1;

delay();

SDA = 0;

delay();

}

void stop(){

SDA = 0;

delay();

SCL = 1;

delay();

SDA = 1;

delay();

}

void write(uchar date)

{

uchar i,temp;

temp=date;

for(i=0;i＜8;i++)

{

temp=temp＜＜1;

SCL=0;

delay();

SDA=CY;

delay();

SCL=1;

delay();

}

SCL=0;

delay();

SDA=1;

delay();

}

uchar read()

{

uchar i,k;

SCL=0;

delay();

SDA=1;

delay();

for(i=0;i＜8;i++)

{

SCL=1;

delay();

k=(k＜＜1)|SDA; // 將SDA賦給K的每一位

SCL=0;

delay();

}

return k;

}

void response(){

int i;

SCL = 1; //在SCL為高電平期間，進(jìn)行應(yīng)答

delay();

while((SDA == 1) && (i ＜ 170))i++; //SCL釋放總線，等待從設(shè)備應(yīng)答，從設(shè)備會把SDA拉低

SCL = 0;

delay();

}

void At24c_Write(uchar address, uchar value){

start();

write(0xa0); //寫入設(shè)備地址

response();

write(address); //寫入首地址

response();

write(value); //寫入數(shù)據(jù)

response();

stop();

}

uchar At24c_Read(uchar address){

uchar value;

start();

write(0xa0); //偽寫，先寫入設(shè)備地址

response();

write(address); //再寫入要讀取數(shù)據(jù)的首地址

response();

start(); //再次

write(0xa1); //寫入要讀取數(shù)據(jù)的地址，方向為1

response();

value = read(); //讀取數(shù)據(jù)

stop();

return value;

}

void main(){

P1 = 0x0; // 位選，使最地位數(shù)碼管被選中

Init();

At24c_Write(23,0x5b); // 在EEPROM的23這個地址上寫數(shù)據(jù)0x5b

delay1(100); // 在寫和讀之間要多延時一會兒，否則器件處理不完

P2 = At24c_Read(23); // 讀取23地址的數(shù)據(jù)，也就是剛才寫入的數(shù)據(jù)

while(1);

}

掉電后數(shù)據(jù)不丟失，復(fù)位后，仍然從剛才掉電的數(shù)字開始往下顯示。從0"9

#include ＜reg52.h＞

#define uchar unsigned char

#define uint unsigned int

sbit SCL = P3^6;

sbit SDA = P3^7;

uchar temp, sum;

uint flag;

unsigned char code duan[]={

0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,

0x77,0x7C,0x39,0x5E,0x79,0x71};

void delay()

{ ;; } //5us

void delay1(uchar x)

{

uchar a,b;

for(a=x;a＞0;a--)

for(b=100;b＞0;b--);

}

void Init(){

SCL = 1;

SDA = 1;

}

void start(){

SDA = 1;

delay();

SCL = 1;

delay();

SDA = 0;

delay();

}

void stop(){

SDA = 0;

delay();

SCL = 1;

delay();

SDA = 1;

delay();

}

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