shumaguan.h

iccavr下

/* 
   this file is the head file 
*/


#include<iom16v.h>
#include<macros.h>
#include"delay.h"
//macros.h 中有BIT(x)	(1 << (x))定义，  比如  BIT(5)相当于将第5位置1

const unsigned char discode[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,
                               0x82,0xf8,0x80,0x90,0xff}; //共阳数码管
/*--------------------------------------------------------*/
 //para  number: the number to be displayed
/*--------------------------------------------------------*/
void display(unsigned int number)
{
 	
	
	 	 
 	 PORTB &=~BIT(PORTB0);           //light the first bit of the shumaguan
	                                 //PORTB0 was defined in iom16v.h
 	 PORTA=discode[number/1000];               //display the thousand bit    
	 delay_nms(5);                           
	 PORTB |=BIT(PORTB0);             //turn off the first bit of the shumaguan
 	 
	 PORTB &=~BIT(PORTB1);
 	 PORTA=discode[number/100%10];
	 delay_nms(5);
	 PORTB |=BIT(PORTB1);
	 
	 PORTB &=~BIT(PORTB2);
 	 PORTA=discode[number%100/10];
	 delay_nms(5);
	 PORTB |=BIT(PORTB2);
	 
	 PORTB &=~BIT(PORTB3);
 	 PORTA=discode[number%10];
	 delay_nms(5);
	 PORTB |=BIT(PORTB3);
}