dianzhen.c

这是一个点阵显示程序

#include <at89x52.h>
#define uchar unsigned char

uchar i=0x00;
uchar j=0x00;
uchar k=0x00;
uchar t=0x00;
uchar keytemp;
uchar x;
uchar count=0x00;
const uchar b[8] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};//逐列扫描码 
const uchar c[8] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //逐行扫描码
const uchar code a[][8] = {
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x66,0x53,0x4e,0x00,0x3e,0x43,0x43,0x7e,//20
		0x3e,0x43,0x43,0x7e,0x00,0x7e,0x4b,0x7a,//06
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x1E,0xE0,0x3E,0xE0,0x1E,0x00,0x00,//W
        0x00,0x82,0xFE,0x92,0xBA,0x82,0xC6,0x00,//E
		0x00,0x82,0xFE,0x82,0x80,0x80,0xC0,0x00,//L
        0x00,0x7C,0x82,0x82,0x84,0x66,0x00,0x00,//C
		0x00,0x38,0x44,0x82,0x82,0x82,0x44,0x38,//O
        0x00,0xFF,0x0C,0x30,0xC0,0x30,0x0C,0xFF,//M
        0x00,0x00,0x00,0xDf,0xdf,0x00,0x00,0x00,//!
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0xfd,0xe5,0xdf,0xc5,0xff,0xe5,0xfd,0x00,//西
		0x00,0x00,0x00,0x00,//0x00,0x00,0x00,0x00,
		0xfd,0x35,0x3d,0xf7,0x3d,0xb5,0xfd,0x00,//南
		0x00,0x00,0x00,0x00,//0x00,0x00,0x00,0x00,
		0x35,0xff,0x35,0x28,0x3e,0x20,0xff,0x30,//科
		0x00,0x00,0x00,0x00,//0x00,0x00,0x00,0x00,
		0x94,0xff,0x94,0x9a,0x6f,0x6a,0x9a,0x80,//技
		0x00,0x00,0x00,0x00,//0x00,0x00,0x00,0x00,
		0x84,0x44,0x24,0x1f,0x34,0x44,0x84,0x80,//大
    	0x00,0x00,0x00,0x00,//0x00,0x00,0x00,0x00,
    	0x26,0x2b,0xaa,0xfb,0x3a,0x2b,0x22,0x24,//学
    	0x00,0x00,0x00,0x00,//0x00,0x00,0x00,0x00,
};




void device_init();
void display();
void next();

/****************************************************************************** 
名称：device_init 
功能：初始化端口、状态寄存器。打开定时器0，按方式1工作，设计数初值为0x3caf 
参数：无 
******************************************************************************/ 
void device_init()
{
   TL0=0xbf;                       //置定时器初值0xf0bf 
   TH0=0xf0; 
   TMOD=0x01;                      //设定定时器/计数器0工作方式为1 
   IE=0x82;                        //允许全局中断，允许定时器/计数器0溢出中断 
   TR0=0x01;                       //启动定时器/计数器0   
}


/****************************************************************************** 
名称：Base_Send 
功能：发送8bit到1个74HC595中   P1_5 控制线 P1_6 数据线 P1_7 时钟线 
参数：send_data，为欲发送的数据 
******************************************************************************/ 
void base_send(uchar send_data)
{
	uchar index = 0x00;
	for (index=0x00; index<0x08; index++)
	{
		P1_7 = 0;
		P1_6 = send_data & (0x80 >> index);
		P1_7 = 1;
	}
}

 
/****************************************************************************** 
名称：Send 
功能：发送16bit到级联的2个74HC595中 
参数：first,second 分别为欲发送到2个74HC595中的数据 
******************************************************************************/  
void send(uchar first,uchar second)
{
	P1_5= 0;
	base_send(first);   //发送列控制码
	base_send(second);	//发送行控制码
	P1_5= 1;
}


//---------------------------------------
void display()
{
      if(j>t%8)
       x=i;
      else
       x=(i+1)%0x15;

	  send(c[k],a[x][j]);

      j++;
      if(j==0x08)
      {
          j=0x00;
      }
      k++;
      if(k==0x08)
      {
          k=0x00;
      }
}
//---------------------------------------
void next()//字符移动
{
      t++;
      if(t==(0x15)*8)
      {
      t=0x00;
      }
      i=t/8;
      j=t%8;
}

/****************************************************************************** 
名称：timer0_over 
功能：定时器/计数器0溢出中断服务程序，每1秒钟更新显示一次 
参数：无 
******************************************************************************/ 
void timeover()(void)   interrupt 1
{
      count++;
      if(count==0x40)
      {
       count=0x00;
       next();
      }

      display(); 	//调用显示函数 
      TL0=0xbf;  	//置初值0xf0bf 
      TH0=0xf0;
}



//---------------------------------------
void main()
{
      device_init();
      while(1)
      {
      }
}