基于mega8的8位AD转换,数码管显示

#include

#include

#include

#include

#define uint unsigned int

#define uchar unsigned char

#define a0 PORTB&=0XF7 //a=0

#define a1 PORTB|=0X08 //a=1

#define b0 PORTB&=0XdF //b=0

#define b1 PORTB|=0X20 //b=1

#define c0 PORTC&=0XFb //c=0

#define c1 PORTC|=0X04 //c=1

#define hc138dis PORTB&=0XEF //g=0

#define hc138en PORTB|=0X10 //g=1

uchar table[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; unsigned char disbuf;

unsigned char adcbuf[8];

void AD_init(void)

{

ADMUX=0X60; //参考电压=A VCC 转换结果向左看齐，AD通道0 ADCSRA=0X85; //AD使能，转换时钟选择位=FOSC/32，单次转换}

//---------------------------------------

//名称: AD转换函数

//作者：cby

//网站：宁波单片机开发网

//网址：https://www.360docs.net/doc/bb2003396.html,

//邮箱：nbdpj@https://www.360docs.net/doc/bb2003396.html,

//日期：20090304

//-----------------------------------------

unsigned char adc_read(void)

{

unsigned char i;

unsigned int ret;

for(i=0;i<8;i++)

{

ADCSRA|=0X40; //启动转换

while(ADCSRA&0x40);

adcbuf[i]=ADCH;

}

ret=0;

for(i=0;i<8;i++)

{

ret+=adcbuf[i];

}

ret=ret/8;

return ret;

}

void main()

{

uint i,j;

DDRD=0xff;

DDRC=0xff;

DDRB=0xff;

AD_init(); //AD初始化函数

while(1)

{

disbuf=adc_read();

PORTB=0xd7;

PORTC=0xff;

PORTD=disbuf%10;

_delay_ms(2);

PORTB=0xff;

PORTC=0x00;

PORTD=(disbuf%100)/10;

_delay_ms(2);

PORTB=0xf7;

PORTC=0x00;

PORTD=disbuf/100;

_delay_ms(2);

//PORTB=0xdf;

//PORTC=0x00;

//PORTD=table[i/1000];

//_delay_ms(2);

} }