led_water_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>


/*--------------------------------------------------------------*/
//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								
								0xF7,0xF7,0xF7,0xF7,0xF7,0xF7,0xF7,0xF7,			//_
								0xff,0xff,0xff,0xff,0xff,0xff,0xff,			 		//空格
								0xBF,0xBF,0xBF,0xBF,0xBF,0xBF,0xBF,0xBF,
								0xff,0xff,0xff,0xff,0xff,0xff,0xff,	
								0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,
								0xff,0xff,0xff,0xff,0xff,0xff,0xff,
								0xF7,0xBF,0xFE,0xBF,0xF7,0xBF,0xFE,0xBF,0xF7,
								0xB6,0xB6,0xB6,0xB6,0xB6,0xB6,0xB6,0xB6,
								0xF7,0xB7,0xB7,0xB6,0xB6,0xB7,0xB7,0xF7,0xF7,
								0xff,0xff,0xff,0xff,0xff,0xff,0xff};		 		

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)
{
	LED_Position = 0x00;						//消影	
	LED_Position = 0x80 >> LED_Pos;				//位选
    LED_Segment  = LED_Seg[offset + LED_Pos];	//段码

	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;

	if((n > 6 && n < 15)||(n > 21 && n < 30))	LED_Display1(&LED_Seg[n], 1);
	else 	LED_Display1(&LED_Seg[n], 0);
//	LED_Display2(n);
	Count++;
	if(Count == 50)
	{
		Count = 0; 
		n++; if(n == Num-7) n = 0;  
	}
}


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