def.h

基于AVR的数字频率计

#ifndef _def_h_
#define _def_h_

#include <avr/io.h>
#include <avr/iom8.h>
#include <avr/signal.h>
#include <stdint.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include <stdio.h>


#define P0 0
#define P1 1
#define P2 2
#define P3 3
#define P4 4
#define P5 5
#define P6 6
#define P7 7

#define FREQ 8
#define uint unsigned int
#define uchar unsigned char
#define SET_DISPLAY(x) PORTB&=~0x3E;PORTB|=((x<<1&0x06)|(x<<2&0x30));PORTC&=0xf0;PORTC|=(x>>4)
#define SET_74LS138(x) PORTD&=0x1f;PORTD|=((x<<5)&0xe0)
#define SET_CHANNEL(x) PORTD&=0xf3;PORTD|=((x<<2)&0x0c)
#define SET_DIGITAL_MODE  displaymode=2
#define SET_UART_MODE displaymode=1
#define SET_PC4 PORTC|=0x10;
#define CLR_PC4 PORTC&=~0x10;


void delay_nms(unsigned ms)                //N ms延时函数
{
	uint i;
	for(i=0;i<ms;i++)
		_delay_loop_2(FREQ*250);
}


#endif