adc__.c

在控制单元的开关调整元件（T1）接通期间

#include <mega16.h>
	#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
#include <delay.h>
#define ADC_VREF_TYPE 0x00 // 定义参考电压 与 左右对齐
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 | (ADC_VREF_TYPE & 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=ADC_VREF_TYPE & 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);
        }
}