蓝桥杯CT107D之AT24C02（EEPROM）

IIC驱动程序

#include "reg52.h"
#include "intrins.h"
#include "iic.h"





//总线引脚定义
sbit SDA = P2^1;  /* 数据线 */
sbit SCL = P2^0;  /* 时钟线 */

void IIC_Delay(unsigned char i)
{
    do{_nop_();}
    while(i--);        
}
//总线启动条件
void IIC_Start(void)
{
    SDA = 1;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 0;
    IIC_Delay(DELAY_TIME);
    SCL = 0;	
}

//总线停止条件
void IIC_Stop(void)
{
    SDA = 0;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//发送应答
void IIC_SendAck(bit ackbit)
{
    SCL = 0;
    SDA = ackbit;  					// 0：应答，1：非应答
    IIC_Delay(DELAY_TIME);
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SCL = 0; 
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//等待应答
bit IIC_WaitAck(void)
{
    bit ackbit;
	
    SCL  = 1;
    IIC_Delay(DELAY_TIME);
    ackbit = SDA;
    SCL = 0;
    IIC_Delay(DELAY_TIME);
    return ackbit;
}

//通过I2C总线发送数据
void IIC_SendByte(unsigned char byt)
{
    unsigned char i;

    for(i=0; i<8; i++)
    {
        SCL  = 0;
        IIC_Delay(DELAY_TIME);
        if(byt & 0x80) SDA  = 1;
        else SDA  = 0;
        IIC_Delay(DELAY_TIME);
        SCL = 1;
        byt <<= 1;
        IIC_Delay(DELAY_TIME);
    }
    SCL  = 0;  
}

//从I2C总线上接收数据
unsigned char IIC_RecByte(void)
{
    unsigned char i, da;
    for(i=0; i<8; i++)
    {   
    	SCL = 1;
		IIC_Delay(DELAY_TIME);
		da <<= 1;
		if(SDA) da |= 1;
		SCL = 0;
		IIC_Delay(DELAY_TIME);
    }
    return da;    
}

AT24C02驱动程序

//向AT24C02指定地址写入单字节数据
void Write_EEPROM(unsigned char address,unsigned char Data)
{
	IIC_Start();
	IIC_SendByte(AT24C02_AddrW);
	if(!IIC_WaitAck())
	IIC_SendByte(address);
	if(!IIC_WaitAck())
	IIC_SendByte(Data);
	if(!IIC_WaitAck());
	IIC_Stop();	
}

//读取AT24C02指定地址的单字节数据
unsigned char Read_EEPROM(unsigned char address)
{
	unsigned char temp;
	IIC_Start();
	IIC_SendByte(AT24C02_AddrW);
	if(!IIC_WaitAck())
	IIC_SendByte(address);
	if(!IIC_WaitAck())
	IIC_Start();
	IIC_SendByte(AT24C02_AddrR);
	if(!IIC_WaitAck())
	temp = 	IIC_RecByte();
	if(!IIC_WaitAck())
	IIC_Stop();
	return temp;
}

数码管用拆数函数

#include "reg52.h"
#include "smg.h"

unsigned char c[N];
unsigned char SMG_chai(unsigned int t)
{
	unsigned char i=0;
 	if(t<10)
	c[i]=t;
	else
	{
		while(1)
	    {
		  	c[i]=t%10;
		    t=t/10;
		    i++;
		    if(t<10)
		    break; 
	    }
	    c[i]=t;
	}
	return i;	
}

主函数

#include "reg52.h"
#include "iic.h"
#include "smg.h"

#define FOSC 11059200L
#define T1MS (65536-FOSC/1000)      //1T模式

sfr AUXR = 0x8e;
sfr P4   = 0xC0;					//定义P4口

sbit LED_1 = P0^0;
sbit N_RELAY = P0^4;
sbit N_BUZZ = P0^6;

unsigned char code Duan[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //共阴极段选0~9
unsigned char code Wei[] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //共阴极位选 1--8
unsigned char temp=0,s=0,i1=0;

void T0Init();

void main()
{
	P2 = 0xa0; N_BUZZ=0; N_RELAY=0; P2 = 0x00;
	P2 = 0x80; P0=0xff;  P2 = 0x00;	//关灯	
	temp = Read_EEPROM(0x00);
	Write_EEPROM(0x00,++temp); 
	T0Init();
	while(1)
	{
		i1 = SMG_chai(temp);
	}
}

void T0Init()
{
	AUXR |= 0x80;                   //定时器0为1T模式
//  AUXR &= 0x7f;                   //定时器0为12T模式

    TMOD = 0x00;                    //设置定时器为模式0(16位自动重装载)
    TL0 = T1MS;                     //初始化计时值
    TH0 = T1MS >> 8;
    TR0 = 1;                        //定时器0开始计时
    ET0 = 1;                        //使能定时器0中断
    EA = 1;
}

/* Timer0 interrupt routine */
void tm0_isr() interrupt 1 
{
	static int count = 5;

	P0=0xff;    									//关闭下段选，达到消隐的目的。
	P2 = 0xe0;	P0=~Duan[c[s]];  P2 = 0x00; 
	P0=0x00;							    		//进入位选前先把P0清零，禁止选通数码管。	  
	P2 = 0xc0;	P0=~Wei[7-s];	 P2 = 0x00;
	P0=0xff;
	
	if(s<i1)
	{
		s++;
	}
	else
	s=0;	

	if(count-- == 0)
	{
		count = 5;		
	}		
}