led_roll_display.c

LED数码管移动显示

/*--------------------------------------------------------------*/
//LED八位数码滚动显示
//显示部分用中断方式，便于程序的拓展


/*--------------------------------------------------------------*/
//包含头文件
#include <reg52.h>
#include "74HC595.H"

/*--------------------------------------------------------------*/
//接口定义
#define LED_Position P3			//位选
#define LED_Segment  P0			//段码

//全局变量定义
#define  Num	sizeof(LED_Seg)	//代码长度
unsigned char LED_Pos;			//位扫描
unsigned char code LED_Seg[] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,			 			//空格
								0x89,0x86,0xC7,0xC7,0xc0,0xff,0xA4,0xC0,0xC0,0x10,0xff,	//字符Hello2009.								
								0xff,0x92,0xA4,0xC0,0xF9,0xB0,0xF9,0x19,0xff,			//数字5201314. 
								0xff,0xA4,0xC0,0xC0,0x90,0xBF,0xA4,0xBF,0x24,			//2009-2-2.
								0xff,0xF9,0x82,0xBF,0x99,0xB0,0xBF,0x92,0x30,			//16-43-53.
							    0xff,0xC7,0xC0,0xC1,0x86,0xff,0x99,0xc0,0xC1,			//字符love you
								0xff,0xff,0x8B,0x86,0x8B,0x86,0xff,0x3F,0xBF,0xff,0xDC,0xF7,0xDC,//字符hEhE-.-^_^
								0xff,0xff,0xff,0xff,0xff,0xff,0xff};		 			//空格

unsigned char Count;			//移位速度控制
unsigned char n;				//移位变量


/*--------------------------------------------------------------*/
//定时器初始化
void T0_init(void)                     
{
    TMOD = 0x01;
    TH0  = 0xec;         //5000us
    TL0  = 0x7e;
    IE   = 0x82;
    TR0  = 1;
}


/*--------------------------------------------------------------*/
//LED显示函数1
//Direction = 0 ←左移		
//Direction = 1 →右移
/*
void LED_Display1(unsigned char *p, bit Direction)
{
	LED_Position = 0x00;				//消影	
	if(Direction)
		LED_Position = 0x01 << LED_Pos;	//位选
	else
		LED_Position = 0x80 >> LED_Pos; 
    LED_Segment  = *(p + LED_Pos);		//段码

	LED_Pos++;						    //循环扫描
	if(LED_Pos == 8) LED_Pos = 0;
}
*/


/*--------------------------------------------------------------*/
//LED显示函数2
//offset为偏移量
void LED_Display2(unsigned char offset)
{
//	Ser_IN(0x00); Ser_IN(0x00); Par_OUT(); 	//消影	
	Ser_IN(0x01 << LED_Pos);				//位选
    Ser_IN(LED_Seg[offset + LED_Pos]);		//段码
	Par_OUT();

	LED_Pos++;						    	//循环扫描
	if(LED_Pos == 8) LED_Pos = 0;
}



/*--------------------------------------------------------------*/
//定时器中断服务
void T0_intservice(void) interrupt 1   
{
    TH0 = 0xec;
    TL0 = 0x7e;

//	LED_Display1(&LED_Seg[n], 1);
//	LED_Display1(&LED_Seg[n], 0);	
	LED_Display2(n);
	Count++;
	if(Count == 100)
	{
		Count = 0; 
		n++; if(n == Num-7 ) n = 0;  
	}
}


/*-------------------------------------------------------------*/
//主函数
void main(void)
{
	T0_init();
	while(1);
}