Design of frequency meter based on ATMEGA16 single chip microcomputer-EEWORLD

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Complete program download address: http://www.51hei.com/f/avrplj.rar

Main function (main()): /*

Program function: frequency meter

Author: Zhu Bo

Date: January 28, 2012

Note: PB1 is the input port

Definition: Frequency meter - frequency is the number of times a signal changes within 1 second. A digital frequency meter measures the number of times a signal changes within a standard time of 1 second and then displays it in digital form.

Principle: Use timer 0 to get 1 second, timer 1 enters technical mode, and the count value is obtained in the interrupt of timer 0, which is the frequency value

#include

#include "delay.h"

#include "show.h"

#include "HD_init.h"

#define uchar unsigned char

#define uint unsigned int

unsigned int FREQ=0; //define global variables for calculation

void main()

{

PORT_Init(); //Port initialization

timer1_init(); //Timer 1 initialization

timer0_init(); //Timer 0 initialization

SEI(); // Enable general interrupt

while(1)

{

display();

}

}[page]

Hardware initialization function HD_init.c:

#include

#define uchar unsigned char

#define uint unsigned int

#include "HD_init.h"

extern unsigned int FREQ; //define global variables for calculation

uint time_num=250;//250*4ms=1s

//Port initialization function

void PORT_Init()

{

DDRB = 0xFD; //PB1 as input port

}

//T0 overflow interrupt service routine

#pragma interrupt_handler timer0_ovf_isr:10

void timer0_ovf_isr(void)

{

TCNT0 = 0x83; //Reassign value

if(!--time_num)

{

FREQ=TCNT1L;

FREQ|=TCNT1H<<8; //This is how to read the value of the lower eight bits and the upper eight bits

TCNT1H=0; //Count value reset to zero

TCNT1L=0;

time_num=250; //Timer 0 sets the timer to 4ms, multiply by 250 to get 1s

}

//Timer T1 initializes and enters counting mode

void timer1_init(void)

{

TCCR1B = 0x00; //stop

TCNT1H = 0x00 /*INVALID SETTING*/; //setup

TCNT1L = 0x00 /*INVALID SETTING*/;

TCCR1A = 0x00;

TCCR1B = 0x06; //start Timer

}

//Timer T0 initializes the timing to 4ms

void timer0_init(void)

{

TCCR0 = 0x00; //Stop the timer

TCNT0 = 0x83; //initial value

OCR0 = 0x82; //match value

TIMSK |= 0x01; //Interrupt enable

TCCR0 = 0x04; //Start the timer

}

Delay function (delay.c):

#define uchar unsigned char

#define uint unsigned int

#include "delay.h"

void delay(uint ms)

{

uint i,j;

for(i=0;i

{

for(j=0;j<1141;j++);

}

Display function (show.c)

#include

#define uchar unsigned char

#define uint unsigned int

#include "show.h"

extern unsigned int FREQ; //define global variables for calculation

const table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,

0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void show(uchar j,uchar k)

{

DDRA|=BIT(3);

DDRA|=BIT(4);

DDRD=0XFF;

PORTA|=BIT(3);

PORTD=table[j];

PORTA&=~BIT(3);

delay(3); //This delay is very important in simulation

PORTD=0XFF;

PORTD&=~BIT(k);

PORTA|=BIT(4);

PORTA&=~BIT(4);

}

void display()//Actually only the last one is enough, keep so many

//Just to keep an algorithm

{

if(FREQ<10)

{

show(FREQ%10,1);

show(0,2);

show(0,3);

show(0,0);

}

else if(FREQ<100)

{

show(FREQ%10,1);

show(FREQ%100/10,2);

show(0,3);

show(0,0);

}

else if(FREQ<1000)

{

show(FREQ%10,1);

show(FREQ%100/10,2);

show(FREQ%1000/100,3);

show(0,0);

}

else

{

show(FREQ%10,1);

show(FREQ%100/10,2);

show(FREQ%1000/100,3);

show(FREQ/1000,0);

}

The following are the interface functions:

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show.h:

#define uchar unsigned char

#define uint unsigned int

#ifndef delay_h

#define delay_h

extern void show(uchar j,uchar k);

extern void display();

#endif

HD_init.h:

#ifndef HD_init_H

#define HD_init_H

extern void PORT_Init();

extern void timer0_init(void);

extern void timer1_init(void);

#endif

delay.h:

#define uchar unsigned char

#define uint unsigned int

#ifndef delay_h

#define delay_h

extern void delay(uint ms);

#endif

Keywords：ATMEGA16 Reference address：Design of frequency meter based on ATMEGA16 single chip microcomputer

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