基于atmega16的spi程序和片内ADC驱动

#include <iom16v.h> #include <avrdef.h> const unsigned char duacode[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; //0-f 数字模*/ void delay(unsigned int); void display(unsigned int); unsigned int AD_read(); void main() {unsigned int i=0; while(1) { i=AD_read(); display(i); } } unsigned int AD_read() { unsigned int data; DDRA&=~BIT(0); PORTA&=~BIT(0); ADMUX=0x20; ADCSR|=BIT(7); ADCSR|=BIT(6); while(!(ADCSR&0x10)); data=ADCH; return data; } void display(unsigned int dat) { unsigned char a[4],i; for(i=0;i<4;i++) { a[3-i]=dat%10; dat/=10; } DDRC=0xff; DDRD=0xff; for(i=0;i<4;i++) { PORTC=duacode[a[i]]; PORTD&=~BIT(i); delay(10); PORTD|=BIT(i); } } void delay(unsigned int x) { unsigned int a; unsigned char b; for(a=x;a>0;a--) for(b=100;b>0;b--); }