原创 用点阵LED显示I LOVE YOU！

   转自我的单片机博客：http://sincos.in/

先看看效果：

这段时间一直在折腾单片机的显示设备，今天折腾到了点阵LED。板子上配的是8X8的点阵LED，不过学会了8X8的之后更大的点阵LED也可以套用这个模式进行编程啦。

点阵LED的电路图如下：

#include <reg52.h>
#include <intrins.h>
typedef unsigned char uint8;
typedef unsigned int  uint16;

 sbit   D24 = P2^4;
 sbit   D25 = P2^5;
 sbit   U1 = P2^6;
 sbit   U2 = P2^7;

uint8 counter = 0;
uint8 offset = 0;

 code  uint8  table[]={ 0xFF,0xC3,0xBD,0xBD,0xAD,0x9D,0x83,0x7F,		//Q
 						0xFF,0xFF,
 						0xFF,0x81,0x81,0xE7,0xE7,0xE7,0xE7,0xFF,		//T
 						0xFF,0xFF,
 						0xC1,0xC1,0xF9,0xF9,0xC1,0xC1,0xF9,0xF9,		//F
						0xFF,0xFF,
 						0x81,0xC3,0xE7,0xE7,0xE7,0xE7,0xC3,0x81,
						0xFF,0xFF,				//插入2行空行
						0x99,0x0,0x0,0x0,0x81,0xC3,0xE7,0xFF,
						0xFF,0xFF,
						0xFF,0x99,0xDB,0xDB,0xDB,0xDB,0xE7,0xFF,
						0xFF,0xFF,										};	   //分别是 I和爱心，还有U三个图形

  void init_timer0()
 {
   TH0 = 0xB1;
   TL0 = 0xE0;
   TR0 = 1;

   TMOD |= 0x01;			   //计时模式选01模式

 }

void init_interrupt()
{
	EA = 1;        //中断总开关
	ET0 = 1;		//定时器1中断
}

 delay(uint8 t)
{
while (t--)
{;}
}

void init_74hc164()
{
	uint8 i =0;
	D25 = 0;
	for(;i<8;i++)
	{
	   D24 = 0;
	   D24 = 1;
	}
}

void refresh_led(uint8 offset)
{
		int i = 0;
		int j = 0;
		init_74hc164();	   			//把74HC164里的高电平全清掉。

		for(;i<8;i++)
		{
			P0 = 0xff;						//消隐
			U1 = 1;
			U1 = 0;
			init_74hc164();

			D25 = 1;
			for(j = 0; j<=i; j++)		//把高电平定位到想要的位置
			{
				D24 = 0;
				D24 = 1;
				D25 = 0;
			}
			P0 = table[offset++];
			U1 = 1;
			U1 = 0;
			delay(50);
			if(offset  == 60)
			{
				offset = 0;
			}
		}

}

 void main(void)
 {
	P0 = 0xff;
    U2 = 1;
	U2 = 0;
	P0 = 0xff;
   	D25 = 1;

	P0 =0xff;
	U1 = 1;
	U1 = 0;
	P0 = 0xff;
	init_timer0();
    init_interrupt();
	init_74hc164();
    while(1)
	{

		refresh_led(offset);
	}

 }

  void timer0_interrupt() interrupt 1
 {
	 			  //每次计时是20ms,达到20ms后计时器0的溢出位位1，进行软件清零和计时器初始化. 

	     counter++;
		 TF0=0;
		 TH0 = 0xB1;         //12MHZ的晶振算出来是从45536开始计时，十六进制就是 0xB1E0
		 TL0 = 0xE0;		 //高位取0xB1,低位取0xE0

        P0 = 0xff;
		U1 = 1;
		U1 = 0;
		if(counter == 10)
		{
			counter = 0;
			offset++;
			if(offset == 60)
			{
				offset = 0;
			}
		}

 }