adc.i

利用avr的芯片MEGA64L的ADC功能来计算电压

// CodeVisionAVR C Compiler
// (C) 1998-2004 Pavel Haiduc, HP InfoTech S.R.L.

// I/O registers definitions for the ATmega64


#pragma used+
sfrb PINF=0;
sfrb PINE=1;
sfrb DDRE=2;
sfrb PORTE=3;
sfrb ADCL=4;
sfrb ADCH=5;
sfrw ADCW=4;      // 16 bit access
sfrb ADCSRA=6;
sfrb ADMUX=7;
sfrb ACSR=8;
sfrb UBRR0L=9;
sfrb UCSR0B=0xa;
sfrb UCSR0A=0xb;
sfrb UDR0=0xc;
sfrb SPCR=0xd;
sfrb SPSR=0xe;
sfrb SPDR=0xf;
sfrb PIND=0x10;
sfrb DDRD=0x11;
sfrb PORTD=0x12;
sfrb PINC=0x13;
sfrb DDRC=0x14;
sfrb PORTC=0x15;
sfrb PINB=0x16;
sfrb DDRB=0x17;
sfrb PORTB=0x18;
sfrb PINA=0x19;
sfrb DDRA=0x1a;
sfrb PORTA=0x1b;
sfrb EECR=0x1c;
sfrb EEDR=0x1d;
sfrb EEARL=0x1e;
sfrb EEARH=0x1f;
sfrw EEAR=0x1e;   // 16 bit access
sfrb SFIOR=0x20;
sfrb WDTCR=0x21;
sfrb OCDR=0x22;
sfrb OCR2=0x23;
sfrb TCNT2=0x24;
sfrb TCCR2=0x25;
sfrb ICR1L=0x26;
sfrb ICR1H=0x27;
sfrw ICR1=0x26;   // 16 bit access
sfrb OCR1BL=0x28;
sfrb OCR1BH=0x29;
sfrw OCR1B=0x28;  // 16 bit access
sfrb OCR1AL=0x2a;
sfrb OCR1AH=0x2b;
sfrw OCR1A=0x2a;  // 16 bit access
sfrb TCNT1L=0x2c;
sfrb TCNT1H=0x2d;
sfrw TCNT1=0x2c;  // 16 bit access
sfrb TCCR1B=0x2e;
sfrb TCCR1A=0x2f;
sfrb ASSR=0x30;
sfrb OCR0=0x31;
sfrb TCNT0=0x32;
sfrb TCCR0=0x33;
sfrb MCUCSR=0x34;
sfrb MCUCR=0x35;
sfrb TIFR=0x36;
sfrb TIMSK=0x37;
sfrb EIFR=0x38;
sfrb EIMSK=0x39;
sfrb EICRB=0x3a;
sfrb XDIV=0x3c;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-


// Interrupt vectors definitions



volatile unsigned char n;
volatile unsigned int alt2;
volatile unsigned int vcc2;
                     
void initadc(void)
{
ADMUX=0X40;
ADCSRA=0X86;
} 
void initusart0(void)          //串口0的初始化
{
  (*(unsigned char *) 0x95) =0x06;
  UBRR0L=0x07; 
  (*(unsigned char *) 0x90)=0x00;
  UCSR0A = 0x00;
  UCSR0B = 0x98;
} 
 void put_c(char c)
   {
   while(!(UCSR0A&(1<<5        )));
   UDR0=c;
   }  
  
unsigned int read_adc(unsigned char abc_input)
  { 

   ADMUX=abc_input;
   ADCSRA=0Xc6;
   while((ADCSRA&0X10)==0);
   ADCSRA&=~(1<<4); 
   ADCSRA&=~(1<<7);
   return ADCW;
   }

void inittime0(void)
{
   TIMSK=0X10;
   (*(unsigned char *) 0x7d)=0X00;
   TCCR1A=0X00;
   TCCR1B=0X0C;
   (*(unsigned char *) 0x7a)=0X00;  
   OCR1A=28800;
   } 
    unsigned int alt_on(void)
  {
        unsigned int alt;
        unsigned int alt1;
        alt1=(read_adc(0x40))*100;
        alt=alt1*3.3 /1024;
        return alt;
  }
  unsigned int vcc_on(void)
{      
  unsigned int vcc1;
  unsigned int vcc;
  vcc1=(read_adc(0x41))*100;     
  vcc=vcc1*3.3 /1024;       
  return vcc;
} 
void inttostr_adc(unsigned int vcc)
{
 unsigned int z;
 unsigned int u;
 unsigned int q;
 z=vcc/100+0x30;
 u=vcc%100/10+0x30;
 q=vcc%10+0x30;
 put_c(z);
 put_c(u);
 put_c(q);
 put_c(0x0d);
 put_c(0x0a);
}
  
   interrupt[13]void timer1_compa(void)
   {
     n++;
     if(n==5){
     alt2=alt_on() ; 
     inttostr_adc(alt2);
     vcc2=vcc_on(); 
     inttostr_adc(vcc2);
     n=0;  

     }
}
void main(void)
{  
 #asm("sei")
 inittime0();
 initadc();      
 initusart0(); 
 PORTA=0xFF;											
 PORTC=0xFF;
 DDRB=0x60;				
 PORTB=0x40;				
 DDRD=0x01;
 PORTD=0x01;								
 
 DDRE=0x20;
}