2019年10月12日 | ATmega8的eeprom读写操作程序

ATmega8的eeprom读写操作，实测没问题

单片机源程序如下:

//ICC-AVR application builder

// Target : M8

// Crystal: 8.0000Mhz

#include

#include

#include <74164.h>

#include

unsigned char    display[4];  // 显示缓冲区

unsigned char    dis;         // 当前显示

unsigned char    s,m;          // 时间

//TIMER0 initialisation - prescale:256

// WGM: Normal

// desired value: 5mSec

// actual value:  4.992mSec (0.2%)

void timer0_init(void)

{

TCCR0 = 0x00; //stop

TCNT0 = 0x64; //set count

TCCR0 = 0x04; //start timer

}

#pragma interrupt_handler timer0_ovf_isr:10

void timer0_ovf_isr(void)

{

TCNT0 = 0x64; //reload counter value

//  display

    switch(dis){  //  显示

        case  0:  write164(display[dis] | 0x70);  break;

        case  1:  write164(display[dis] | 0xB0);  break;

        case  2:  write164(display[dis] | 0xD0);  break;

        case  3:  write164(display[dis] | 0xE0);  break;

    }

    if(++dis > 3) dis = 0;

//end  display

}

//TIMER1 initialisation - prescale:1024

// WGM: 0) Normal, TOP=0xFFFF

// desired value: 1Hz

// actual value:  1.000Hz (0.0%)

void timer1_init(void)

{

TCCR1B = 0x00; //stop

TCNT1H = 0xE1; //setup

TCNT1L = 0x7C;

OCR1AH = 0x1E;

OCR1AL = 0x84;

OCR1BH = 0x1E;

OCR1BL = 0x84;

ICR1H  = 0x1E;

ICR1L  = 0x84;

TCCR1A = 0x00;

TCCR1B = 0x05; //start Timer

}

#pragma interrupt_handler timer1_ovf_isr:9

void timer1_ovf_isr(void)

{

//TIMER1 has overflowed

TCNT1H = 0xE1; //reload counter high value

TCNT1L = 0x7C; //reload counter low value

if(++s == 60){

   s = 0;

   if(++m == 60) m = 0;

}

EEPROMwrite(1,s);       //  保存时间

EEPROMwrite(2,m);

display[0] = s % 10;    //  刷新显示缓冲

display[1] = s / 10;

display[2] = m % 10;

display[3] = m / 10;

}

//call this routine to initialise all peripherals

void init_devices(void)

{

//stop errant interrupts until set up

CLI(); //disable all interrupts

DDRB = 0x01;    //  初始化操作74LS164的管脚

DDRD = 0xC0;    //  初始化操作74LS164的管脚

timer0_init();

timer1_init();

MCUCR = 0x00;

GICR  = 0x00;

TIMSK = 0x05; //timer interrupt sources

SEI(); //re-enable interrupts

//all peripherals are now initialised

}

//

void main(void)

{

init_devices();

s = EEPROMread(1);  //  读取时间

m = EEPROMread(2);

display[0] = s % 10;    //  刷新显示缓冲

display[1] = s / 10;

display[2] = m % 10;

display[3] = m / 10;

while(1);

}