应广单片机应用之--数码管驱动

在单片机应用中,数码管是经常用的是器件之一.如果把一个简单的单片机系统看成是一台电脑,那么数码管就相当于一台电脑的显示器.现用一个2位半的数码管做个范例,循环显示0-199,稍作改造就可以做成一个计算器.使用8pin数码管,采用扫描方式驱动,4*4,正好16段.单片机使用pms152,不多说上代码.

应广单片机应用之--数码管驱动

实际显示效果

#include "extern.h"

BIT       COM1    :PB.0;/*Pin8*/
BIT       COM2    :PB.1;/*Pin1*/
BIT       COM3 :PB.2;/*Pin6*/
BIT       COM4 :PB.3;/*Pin3*/

BIT       SEG1    :PB.4;/*Pin7*/
BIT       SEG2    :PB.5;/*Pin5*/
BIT       SEG3 :PB.6;/*Pin4*/
BIT       SEG4 :PB.7;/*Pin2*/

/*显示变量区域*/
byte ucLcdComVoltSw;

byte ucHun;
byte ucTen;
byte ucOne;

bit SB2:ucHun.1;
bit SC2:ucHun.2;

bit SA0:ucTen.0;
bit SB0:ucTen.1;
bit SC0:ucTen.2;
bit SD0:ucTen.3;
bit SE0:ucTen.4;
bit SF0:ucTen.5;
bit SG0:ucTen.6;
bit SH0:ucTen.7;

bit SA1:ucOne.0;
bit SB1:ucOne.1;
bit SC1:ucOne.2;
bit SD1:ucOne.3;
bit SE1:ucOne.4;
bit SF1:ucOne.5;
bit SG1:ucOne.6;
bit SH1:ucOne.7;

/*系统时钟变量*/
bit FLAG_NMS;/*定时时间是否到了cinit*/
word usSystick;
BYTE count;/* count区*/
word T16COUNTER;/*定时器初始化cinit*/
word usMsTmr;

BYTE ucVoltChgTmr;
BYTE ucVoltPerc;

/*系统变量*/
word point;

/*算法变量*/
BYTE div_src, div_val, div_res;

void   Byte_Div_Byte (void)
{   //   div_src[B] / div_val[B]   =   div_src[B] * div_val[B] + div_res[B]
   BYTE   div_cnt;
   div_cnt   =   0;
   div_res   =   0;
   A       =   -div_val;
   div_src   <<=   1;
   do
   {
       slc       div_res;
       div_cnt++;

div_res += A;
if (!CF) div_res -= A;

div_src <<<= 1;
} while (! div_cnt.3);
}

/* 共阳led表,共阴取反即可*/
void ReadLedTab ( void )
{
   _pcadd
   {
       ret   0x3f;/*0*/
       ret 0x06;/*1*/
       ret 0x5b;/*2*/
      ret 0x4f;/*3*/
       ret 0x66;/*4*/
       ret 0x6d;/*5*/
       ret 0x7d;/*6*/
       ret 0x07;/*7*/
       ret 0x7f;/*8*/
       ret 0x6f;/*9*/
   }
}
/***************************************/
void TIME16_Init(void)
{
   /*计数值清零*/
   T16COUNTER   =488;
   /*ms标记reset*/
   FLAG_NMS   =0;

   /*使能定时器*/
   INTEN.T16=1;
   /*关中断*/
   INTRQ       =   0;

   STT16 T16COUNTER;

   /*计算方法16M/*/
   $   T16M   IHRC,/1,BIT11;
}

/*显示百分比*/
void DispVoltPerc(void)
{
   byte ucTemp;
if(ucVoltPerc>99&&ucVoltPerc<200)
{
   /*表示显示1*/
   ucHun=0x00;
}
   else
   {
       ucHun=0xff;
   }

/*把电压值变成0-99之间的值*/
div_src=ucVoltPerc;
   div_val=100;
   Byte_Div_Byte();


div_src=div_res;
   div_val=10;
   Byte_Div_Byte();
   /*10 位*/
   A=(div_src+1);
   ReadLedTab();
   /*保存当前值*/
ucTemp=A;
   /*输出为0*/
   if(ucTemp==0x3f)
   {
   /*最高位为1*/
if(!ucHun)
{
      /*显示十位*/
    ucTen=~ucTemp;
}
   /*十位为0,且最高位为0*/
   else
   {
      /*十位不显示*/
      ucTen=0xff;
   }
   }
   else
   {
       ucTen=~ucTemp;
   }

/*个位*/
   A=div_res+1;
   ReadLedTab();
   ucOne=~A;

}

void AppInit(void)
{
ucVoltChgTmr=0;
ucVoltPerc=0;
}

void   FPPA0 ( void )
{
   /*   SYSCLK=2MHz, one cycles =0.5 us */
   .ADJUST_IC   SYSCLK=IHRC/8, IHRC=16MHz, VDD=3.9v;
WORD usTmp;

TIME16_Init();

   /*全亮2s,查看数码管是否连接OK*/
$ COM1 out,high;
$ COM2 out,high;
$ COM3 out,high;
$ COM4 out,high;

$ SEG1    out,low;
$ SEG2    out,low;
$ SEG3 out,low;
$ SEG4 out,low;

   usTmp=200;
   while(usTmp--)
   {
    .delay 20000;
   wdreset;   //复位看门狗定时器
   }
   /*关闭显示*/
   COM1=0;
COM2=0;
COM3=0;
COM4=0;

SEG1=0;
SEG2=0;
SEG3=0;
SEG4=0;
AppInit();
   ucVoltPerc=0;
   engint;
   while ( 1 )
   {
       if(FLAG_NMS)
       {
           usMsTmr++;
           /*300ms更新一次*/
           if(usMsTmr>300)
           {
               /*数字范围0-199*/
               ucVoltPerc++;
               if(ucVoltPerc>199)
               {
                   ucVoltPerc=0;
               }
               usMsTmr=0;
           }
           FLAG_NMS=0;
       }
       /*数码管显示*/
       DispVoltPerc();

   }
}

void IntFlashLed(void)
{

ucLcdComVoltSw++;
if(ucLcdComVoltSw>3)
{
ucLcdComVoltSw=0;
}

switch(ucLcdComVoltSw)
{
case 0:
   SEG1=1;
   SEG2=1;
   SEG3=1;
   SEG4=1;

   #if 1
COM1=1;
   COM2=0;
   COM3=0;
   COM4=0;
   #endif
    if(SA0)
    {
    SEG1=1;
    }
   else
   {
      SEG1=0;
   }


   if(SB0)
    {
    SEG2=1;
    }
   else
   {
      SEG2=0;
   }


   if(SC0)
    {
    SEG3=1;
    }
   else
   {
      SEG3=0;
   }

   if(SD0)
    {
    SEG4=1;
    }
   else
   {
      SEG4=0;
   }



   break;

case 1:
    SEG1=1;
   SEG2=1;
   SEG3=1;
   SEG4=1;
    #if 0
    COM1=1;
   COM2=0;
   COM3=1;
   COM4=1;
   #endif

   #if 1
COM1=0;
   COM2=1;
   COM3=0;
   COM4=0;

   #endif
    if(SF0)
    {
    SEG1=1;
    }
   else
   {
      SEG1=0;
   }


   if(SG0)
    {
    SEG2=1;
    }
   else
   {
      SEG2=0;
   }


   if(SE0)
    {
    SEG3=1;
    }
   else
   {
      SEG3=0;
   }

   if(SB2)
    {
    SEG4=1;
    }
   else
   {
      SEG4=0;
   }



   break;

case 2:
    SEG1=1;
   SEG2=1;
   SEG3=1;
   SEG4=1;
    #if 0
    COM1=1;
   COM2=1;
   COM3=0;
   COM4=1;
   #endif
   #if 1
    COM1=0;
   COM2=0;
   COM3=1;
   COM4=0;
   #endif
    if(SA1)
    {
    SEG1=1;
    }
   else
   {
      SEG1=0;
   }

   if(SB1)
    {
    SEG2=1;
    }
   else
   {
      SEG2=0;
   }

   if(SC1)
    {
    SEG3=1;
    }
   else
   {
      SEG3=0;
   }

   if(SD1)
    {
    SEG4=1;
    }
   else
   {
      SEG4=0;
   }




   break;

case 3:
    SEG1=1;
   SEG2=1;
   SEG3=1;
   SEG4=1;
    #if 0
    COM1=1;
   COM2=1;
   COM3=1;
   COM4=0;
   #endif

   #if 1
    COM1=0;
   COM2=0;
   COM3=0;
   COM4=1;
   #endif
    if(SF1)
    {
    SEG1=1;
    }
   else
   {
      SEG1=0;
   }

   if(SG1)
    {
    SEG2=1;
    }
   else
   {
      SEG2=0;
   }

   if(SE1)
    {
    SEG3=1;
    }
   else
   {
      SEG3=0;
   }

   if(SC2)
    {
    SEG4=1;
    }
   else
   {
      SEG4=0;
   }

   break;

   default:
      break;

}
}

void   Interrupt ( void )
{
   pushaf;


   if ( Intrq.T16 )
   {

Intrq.T16 = 0;

       STT16 T16COUNTER;
       IntFlashLed();
       if ( count>0 )
       {
           count--;
       }
       else
       {
           count = 9;
           /*1ms*/
           FLAG_NMS= 1;
   }

}
   popaf;
}

应广单片机应用之--数码管驱动

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