ad.c

用ATMEGA8做的AD键盘

#include<avr/io.h>
#include<avr/interrupt.h>
#include<avr/signal.h>
#include<dianya.h>
#include<hanshu.h>
#define uint unsigned int
#define uchar unsigned char
float  g_value;
SIGNAL(SIG_INTERRUPT0)
{GICR&=~_BV(INT0);
 delay();delay();delay();delay();delay();delay();delay();delay();delay();delay();
 delay();delay();delay();delay();delay();delay();delay();delay();delay();delay();
delay();delay();delay();delay();delay();delay();delay();delay();

 ADCSRA|=_BV(ADSC);
}
SIGNAL(SIG_ADC)
{uint p;
    cli(); 
    p=ADCL;
    p|=(uint)(ADCH<<8);
    g_value=p*2.56;
    g_value=g_value/1023;
    g_value=g_value*1000;
	anjian(g_value);
	GICR|=_BV(INT0);
	sei();
}		
int main(void)
{  
  ioint();PORTB|=_BV(PB3);
  PORTC&=~_BV(PC2);PORTC&=~_BV(PC3);PORTC&=~_BV(PC5);
  ADMUX=0XC0;//左对齐,通道1
  ADCSRA=_BV(ADIE)|_BV(ADEN)|_BV(ADPS1)|_BV(ADPS0);
  MCUCR|=_BV(ISC01);
  GICR|=_BV(INT0);
  sei();
  while(1)
  {
 }
  }