AVR單片機(jī)頻率計(jì)設(shè)計(jì) 頻率輸入源STM32口
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uint i; //定時(shí)器1秒到時(shí)變量
uint tt; //計(jì)數(shù)頻率
uchar start=1; //定時(shí)器啟動(dòng)變量
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() //定時(shí)器0初始化
{
TCCR0=0x00; //關(guān)閉定時(shí)器
TIMSK|=0x01; //定時(shí)器0溢出中斷
TCNT0=0x83; //定時(shí)1ms
SREG=0x80; //關(guān)閉總中斷
}
#pragma vector = 0x24 //定時(shí)器0中斷
__interrupt void tim0_ovr()
{
i++;
TCNT0=0x83;
if(i==1000) //1秒時(shí)間到
{
i=0;
TCCR1B=0x00; //停止計(jì)數(shù)
TCCR0=0x00; //停止定時(shí)
tt=TCNT1;//頻率值給變量
TCNT1H=0x00;
TCNT1L=0x00; //計(jì)數(shù)清零
TCNT0=0x83; //定時(shí)器初值
start=1; //開啟定時(shí)器啟動(dòng)變量
}
}
void time1_init()
{
TCCR1A=0x00;
TCCR1B=0x00; //停止計(jì)數(shù)
TCNT1H=0x00;
TCNT1L=0x00;
}
void show(uint dat) //頻率值顯示
{
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; //定時(shí)器開啟
TCCR1B=0x06; //計(jì)數(shù)器開啟
start=0; //保證定時(shí)1秒是否開啟變量
}
show(tt);
}
}
//-------------------STM32代碼-------------------------
#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時(shí)鐘
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
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