求助大神看看原因，avrM16做連續(xù)頻率采集。

ID:135062 · 發(fā)表于 2016-7-26 11:41

用avrM16做連續(xù)頻率采集，采集同時輸出500HZ，占空比任意（我用50%）的pwm。我用T1捕獲，端口接ICP1。PB3輸出pwm�，F(xiàn)在問題是，我同時開啟T0,T1輸出不是500HZ，而是隨著輸入頻率改變，并且中間我加了ADC程序，輸出頻率也會改變。但是我只開T0，不加捕獲，輸出的一直是500HZ。

#include <iom16v.h>

#include <macros.h>

#include "delay.h"

#define uint unsigned int

#define uchar unsigned char

#define PWM_0 PORTB&=~(1<<PB3)

#define PWM_1 PORTB|=(1<<PB3)

signed int wendu,flag,flag1,jd,count,flag4,flag3;

signed int yanwu=10;

volatile unsigned int CAPi=0,CAPj=0;

volatile unsigned intCAP[10]={0,0,0,0,0,0,0,0,0,0};

//TIMER1 initialize - prescale:1

// WGM: 0) Normal, TOP=0xFFFF

// desired value: 1mSec

// actual value: 1.000mSec (0.0%)

void timer0_init(void)

{

TCCR0 = 0x00; //stop

TCNT0 = 0x00;

TCNT0 = 0x9c;

OCR0 =0xF0; //改變此值可改變占空比

TCCR0 = 0x02; //設(shè)置為快速PWM模式，匹配時OC0置1，分頻系數(shù)8

}

void main(void)

{

uint dianya;

DDRC=0xFF;

jd=10;

DDRB= 0Xff;

PORTB=0XFF;

DDRD&=~(1<<PD6);

PORTD|=1<<PD6;

TCCR1B=(1<<ICNC1)|(1<<ICES1);

TCCR1B|=0x03;

TIMSK=1<<TICIE1;

MCUCR = 0x00;

GICR =0x00;

timer0_init();

TIMSK = 0x21; //timer interrupt sources

SEI(); //re-enable interrupts 等價與SREG=0x80

while(1)

{

DDRA&=~BIT(0);

ADMUX=0x40;//低4位是通道號參考是AVCC

ADCSRA=0x87; //使能ADC，單次轉(zhuǎn)換，預(yù)分頻為128

ADCSRA|=(1<<ADSC); //啟動首次轉(zhuǎn)換

while(!(ADCSRA&(1<<ADIF))); //等待轉(zhuǎn)結(jié)束循環(huán)

ADCSRA|=(1<<ADIF); //清除ADIF位

dianya=ADCL;//先讀低位這個必須遵守度高位后被更新數(shù)據(jù)

dianya=ADCH*256+dianya;

yanwu=dianya*0.09765625;

if(yanwu>78)

flag1=1;

else

flag1=0;

if((flag==1)&&(flag1==1))

{PORTC=0xff;}

else

{PORTC=0;}

}

#pragma interrupt_handler Timer1_icp_isr:6

void Timer1_icp_isr(void) //6 號中斷

{

unsigned char i;

if(CAPi==0)

{CAPi=ICR1;CAP[0]=ICR1;}//TCCR0 = 0;}

else

{ CAP[1]=ICR1;

CAPj=ICR1-CAPi;

CAPj=1000000/8/CAPj;

if(CAPj>3000)

{flag=1;//TIMSK=0x21;timer0_init();SEI();

}

else

flag=0;

TCCR1B&=0xFC;//11000000

TCCR1B|=0x03;

TCNT1=0;

CAPi=0;

CAPj=0;

}

#pragma interrupt_handlertimer0_ovf_isr:iv_TIM0_OVF //定時器0中斷

void timer0_ovf_isr(void)

{

TCNT0 = 0x9c;

if(count<jd)//PWM比較

{

PWM_1;//高電平轉(zhuǎn)

}

else

PWM_0;//低電平停

count++;

if(count>20)//周期

count=0;

}

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求助大神看看原因，avrM16做連續(xù)頻率采集。

求助大神看看原因，avrM16做連續(xù)頻率采集。