读/写atmega8515内部EEPROM的例子

/**************************************************************

;eeprom.c

;读/写atmega8515内部EEPROM的例子

;将数据0....9写入eeprom中，再读出用数码管显示出来

***************************************************************/

#include "avr/io.h"

#include "avr/eeprom.h"

#define uchar unsigned char

#define Hidden 16

uchar DispTab[17]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF};

uchar BitTab[6]={0x7F,0xBF,0xDF,0xEF,0xF7,0xFB};

uchar DispBuf[6]; //显示缓冲区

unsigned char Counter=0;

static void io_init(void)

{

// PortA

PORTA = 0xff;

DDRA = 0xff;

// PortB

PORTB = 0x0;

DDRB = 0x0;

// PortC

PORTC = 0xfc;

DDRC = 0xfc;

// PortD

PORTD = 0x0;

DDRD = 0x0;

}

void mDelay(uint16_t DelayTim)

{ uint16_t i;

for(;DelayTim>0;DelayTim--)

{ for(i=0;i<600;i++)

{;}

}

}

void disp()

{ static uchar i;

uchar tmp;

if(++i>=6)

i=0;

PORTC=0xff; //关闭显示

tmp=DispBuf[i];

PORTA=DispTab[tmp];

tmp=BitTab[i];

PORTC=tmp;

mDelay(1); //延时1ms

}

int main(void)

{ unsigned int Count=0;

unsigned char Addr=1; //向地址1里面写数字

uint8_t temp=0;

io_init();

DispBuf[0]=Hidden;

DispBuf[1]=Hidden;

DispBuf[2]=Hidden;

DispBuf[3]=Hidden;

DispBuf[4]=0; //次低位显示0

while(1)

{

temp=eeprom_read_byte (Addr);

DispBuf[5]=temp;

if(++Count==1000)

{ Count=0;

Counter++;

eeprom_write_byte(Addr,Counter);

}

if(Counter>=10)

Counter=0; //计数值在0~9之间循环

disp(); //调用显示程序

}

}