很牛的键盘电路。

只看该作者 · 2008-12-14 14:36

朋友发了一张图叫我帮他看看，在他上面发现了一个很牛的键盘接口电路。
发上来分享一下。
16个键，只用了4个IO。

只看该作者 · 2008-12-23 11:39

#include <DEFINE.H>
#include <AT89X51.H>

void ShowEn(void)
{
    LcdShowEn=1;
    ShowDptr=6;
    if(DeleteEn)
    {
        DeleteEn=0;
        RamCler(LcdDataBufs,7);
    }
}
void CmdKey(void)
{

    switch(KeyData)
    {
        case 0x11 ://---发射

                  SendEn=1;
                  DeleteEn=0;
        break;
        case 0x12 ://---上一屏
                  LcdShowEn=1;
                  if(ShowAre>1)
                  {
                       DeleteEn=1;
                       ShowDptr=6;
                       ShowAre--;
                  }
        break;
        case 0x14 ://---下一屏
                  LcdShowEn=1;
                  if(ShowAre<4)
                  {
                       DeleteEn=1;
                       ShowDptr=6;
                       ShowAre++;
                  }
        break;
        case 0x18 ://---发送数据
                  SendEn=1;
                  DeleteEn=0;
        break;
        case 0x21 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x2d;
                  ShowCopy();
        break;
        case 0x22 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x39;
                  ShowCopy();
        break;
        case 0x24 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x36;
                  ShowCopy();
        break;
        case 0x28 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x33;
                  ShowCopy();
        break;
        case 0x41 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x2e;
                  ShowCopy();
        break;
        case 0x42 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x38;
                  ShowCopy();
        break;
        case 0x44 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x35;
                  ShowCopy();
        break;
        case 0x48 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x32;
                  ShowCopy();
        break;
        case 0x81 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x30;
                  ShowCopy();
        break;
        case 0x82 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x37;
                  ShowCopy();
        break;
        case 0x84 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x34;
                  ShowCopy();
        break;
        case 0x88 :
                  ShowEn();
                  LcdDataBufs[ShowDptr]=0x31;
                  ShowCopy();
        break;
   }
}
void GetKeys(void)
{
    unsigned char i,j;
    P0=0xFF;
    DataOneBuf=0;
    DataTwoBuf=0;
    if(KeyFg)
    {
        P0=ScanOne;
        P0|=~ScanTwo;
        if((P0&ScanOne)==0)
        {
            KeyFg=1;
            Delay(500);
        }
        else
        {
            KeyFg=0;
            Delay(500);
        }
    }
    else
    {
       DataOneBuf=0x01;
       for(i=1;i<5;i++)
       {
           DataTwoBuf=0x10;
           for(j=1;j<5;j++)
           {
               P0=0xFF;
               P0=DataOneBuf;
               P0|=~DataTwoBuf;
               if((P0&DataOneBuf)==0)
               {
                   if(ShowAre<5)
                   {
                       KeyFg=1;
                       DatgAAAAAA++;
                       ScanOne=DataOneBuf;
                       ScanTwo=DataTwoBuf;
                       KeyData=DataTwoBuf+DataOneBuf;
                       CmdKey();
                       KeyData=0;
                   }
               }
               DataTwoBuf<<=1;
           }
           DataOneBuf<<=1;
       }
    }
}