AVR单片机频率计设计 频率输入源STM32口

完整的程序源码下载：http://www.51hei.com/f/avrplj.rar

//---------------------AVR代码-----------------------

//芯片用ATMEG16

#include

#define uchar unsigned char

#define uint unsigned int

__flash uchar seg[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, //数码管码表

0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x80};

__flash uchar tab[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //数码管位选

uint i; //定时器1秒到时变量

uint tt; //计数频率

uchar start=1; //定时器启动变量

void port_init()

{

PORTA=0xff;

DDRA=0xff;

PORTB=0xff;

DDRB=0xff;

PORTC=0xff;

DDRC=0xff;

PORTD=0xff;

DDRD=0xff;

}

void delay(uint k)

{

while(k--);

}

void time0_init() //定时器0初始化

{

TCCR0=0x00; //关闭定时器

TIMSK|=0x01; //定时器0溢出中断

TCNT0=0x83; //定时1ms

SREG=0x80; //关闭总中断

}

#pragma vector = 0x24 //定时器0中断

__interrupt void tim0_ovr()

{

i++;

TCNT0=0x83;

if(i==1000) //1秒时间到

{

i=0;

TCCR1B=0x00; //停止计数

TCCR0=0x00; //停止定时

tt=TCNT1;//频率值给变量

TCNT1H=0x00;

TCNT1L=0x00; //计数清零

TCNT0=0x83; //定时器初值

start=1; //开启定时器启动变量

}

}

void time1_init()

{

TCCR1A=0x00;

TCCR1B=0x00; //停止计数

TCNT1H=0x00;

TCNT1L=0x00;

}

void show(uint dat) //频率值显示

{

PORTA=seg[dat/1000];

PORTC=tab[3];

delay(100);

PORTA=seg[dat%1000/100];

PORTC=tab[2];

delay(100);

PORTA=seg[dat%100/10];

PORTC=tab[1];

delay(100);

PORTA=seg[dat%10];

PORTC=tab[0];

delay(100);

}

void main()

{

port_init();

time0_init();

time1_init();

while(1)

{

if(start==1)

{

TCCR0=0x03; //定时器开启

TCCR1B=0x06; //计数器开启

start=0; //保证定时1秒是否开启变量

}

show(tt);

}

}

//-------------------STM32代码-------------------------

#include

#include "sys.h"

#include "delay.h"

#include "usart.h"

#include "led.h"

int main()

{

Stm32_Clock_Init(9);

delay_init(72);

led_init();

while(1)

{

LED=1;

delay_ms(2);

LED=0;

delay_ms(2);

}

}

//--------------------------led.c--------------

#include

#include "led.h"

void led_init(void)

{

RCC->APB2ENR|=1<4; //使能PC时钟

GPIOC->CRH&=0xffffff0f;

GPIOC->CRH|=0x00000030;

GPIOC->ODR|=1<9;

}

//----------------------led.h-------------------------

#ifndef led_h

#define led_h

#include "sys.h"

#define LED PCout(9)

void led_init(void);

#endif