adc.i

在控制单元的开关调整元件（T1）接通期间

// CodeVisionAVR C Compiler
// (C) 1998-2001 Pavel Haiduc, HP InfoTech S.R.L.

// I/O registers definitions for the ATmega16


#pragma used+
sfrb TWBR=0;
sfrb TWSR=1;
sfrb TWAR=2;
sfrb TWDR=3;
sfrb ADCL=4;
sfrb ADCH=5;
sfrw ADCW=4;      // 16 bit access
sfrb ADCSRA=6;
sfrb ADMUX=7;
sfrb ACSR=8;
sfrb UBRRL=9;
sfrb UCSRB=0xa;
sfrb UCSRA=0xb;
sfrb UDR=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 UBRRH=0x20;
sfrb UCSRC=0X20;
sfrb WDTCR=0x21;
sfrb ASSR=0x22;
sfrb OCR2=0x23;
sfrb TCNT2=0x24;
sfrb TCCR2=0x25;
sfrb ICR1L=0x26;
sfrb ICR1H=0x27;
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 SFIOR=0x30;
sfrb OSCCAL=0x31;
sfrb OCDR=0x31;
sfrb TCNT0=0x32;
sfrb TCCR0=0x33;
sfrb MCUCSR=0x34;
sfrb MCUCR=0x35;
sfrb TWCR=0x36;
sfrb SPMCR=0x37;
sfrb TIFR=0x38;
sfrb TIMSK=0x39;
sfrb GIFR=0x3a;
sfrb GICR=0x3b;
sfrb OCR0=0X3c;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-

// Interrupt vectors definitions


// Needed by the power management functions (sleep.h)
#asm
	#ifndef __SLEEP_DEFINED__
	#define __SLEEP_DEFINED__
	.EQU __se_bit=0x40
	.EQU __sm_mask=0xB0
	.EQU __sm_powerdown=0x20
	.EQU __sm_powersave=0x30
	.EQU __sm_standby=0xA0
	.EQU __sm_ext_standby=0xB0
	.EQU __sm_adc_noise_red=0x10
	.SET power_ctrl_reg=mcucr
	#endif
#endasm


// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.


#pragma used+

void delay_us(unsigned int n);
void delay_ms(unsigned int n);

#pragma used-

flash unsigned char table[12] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0xff,0x80};

unsigned int read_adc(unsigned char adc_input) //读取adc
{
ADMUX=adc_input | (0x00  & 0xff);
delay_us(10);
ADCSRA|=0x40;//ADCSR`A.6被置位，ADC转换开始。
while ((ADCSRA & 0x10)==0);//等待转换完成。0x10=0b00010000
    ADCSRA|=0x10;//使能ADC转换。
    return ADCW;
}

unsigned char leddisp(unsigned char a,unsigned char b,unsigned char c,unsigned char d)  //动态数码显示
    {
    unsigned char led[4];
    unsigned char i;
    led[0] = a;
    led[1] = b;
    led[2] = c;
    led[3] = d;
        for(i=0;i<=3;i++)
        {
         
         PORTD |= 0x0f;
         PORTD &= ~(0x01 << i);
         PORTB = table[led[i]];
         delay_ms(1);
        }
    }

unsigned char key()   //按键扫描
    {
              if(PIND.0 == 1) return 1;
         else if(PIND.1 == 1) return 2;
         else if(PIND.2 == 1) return 3;
         else if(PIND.3 == 1) return 4;
         else return 0;
    }


void main()
{
    unsigned int adc,adc_v;
    unsigned char a,b,c,d,j;
    ADMUX=0x00  & 0xff;
    ADCSRA=0x85;
    DDRA = 0xff;
    PORTB = 0x00;
    DDRB = 0xff;
    //PORTD = 0xff;
    DDRD = 0xff;
    
    while(1)
        {
        read_adc(0);
        adc = ADCW;
        adc_v = (unsigned long)adc*5000/1023;
        d = adc_v%10;
        c = adc_v/10%10;
        b = adc_v/100%10;
        a = adc_v/1000;
        leddisp(a,b,c,d);
        }
}