利用單片機外部中斷來獲取矩陣鍵盤鍵值外加可精確到小數(shù)點后6位計算器源程序

ID:547792 · 發(fā)表于 2019-7-28 09:34

利用外部中斷來獲取鍵值，避免了逐行掃描，減少了cpu的占用。準確的獲取鍵值，運用二維數(shù)組來存放鍵值，讓5*5的矩陣鍵盤輸出鍵值，這個設定的二維數(shù)組char xianshi[5][5]={{'(','/','*','-','+'},{')','3','2','1',0},{'6','5','4','0',0},{10,'9','8','7',0},{'=','.','0',11,12}};這位檢查行和列：
while(1)       {

            if(linflag==0)
      {
            row0(1);row1(1);row2(1);row3(1);row4(1);
            if(endflag==0)
            {
               rowflag=0; row0(0);row1(1);row2(1);row3(1);row4(1);
                     delay_nms(10);
            }
            if(endflag==0)
            {
               rowflag=1;
row0(1);row1(0);row2(1);row3(1);row4(1);
                     delay_nms(10);
            }
            if(endflag==0)
            {
               rowflag=2;row0(1);row1(1);row2(0);row3(1);row4(1);
                     delay_nms(10);
            }
            if(endflag==0)
            {

               rowflag=3;row0(1);row1(1);row2(1);row3(0);row4(1);
                     delay_nms(10);
            }
            if(endflag==0)
            {
               rowflag=4;row0(1);row1(1);row2(1);row3(1);row4(0);
                     delay_nms(10);
            }
            row0(0);row1(0);row2(0);row3(0);row4(0);
            endflag=0;
            linflag=1;
      }

檢查列：
if(linflag==1)
      {
            if (EXTI_GetITStatus(EXTI_Line11)!=RESET)
            {
                     lin=0;
                     EXTI_ClearFlag(EXTI_Line11);

            }
            if (EXTI_GetITStatus(EXTI_Line12)!=RESET)
            {
                     lin=1;
                     EXTI_ClearFlag(EXTI_Line12);

            }
            if (EXTI_GetITStatus(EXTI_Line13)!=RESET)
            {
                     lin=2;
                     EXTI_ClearFlag(EXTI_Line13);
            }
            if (EXTI_GetITStatus(EXTI_Line14)!=RESET)
            {
                     lin=3;
                     EXTI_ClearFlag(EXTI_Line14);
            }
            if (EXTI_GetITStatus(EXTI_Line15)!=RESET)
            {
   lin=4;
                     EXTI_ClearFlag(EXTI_Line15);
            }
            linflag=0;
      }
      else if(endflag==1)
      {
            if (EXTI_GetITStatus(EXTI_Line11)!=RESET)
                     EXTI_ClearFlag(EXTI_Line11);
            if (EXTI_GetITStatus(EXTI_Line12)!=RESET)
                     EXTI_ClearFlag(EXTI_Line12);
            if (EXTI_GetITStatus(EXTI_Line13)!=RESET)
                     EXTI_ClearFlag(EXTI_Line13);
            if (EXTI_GetITStatus(EXTI_Line14)!=RESET)
                     EXTI_ClearFlag(EXTI_Line14);
            if (EXTI_GetITStatus(EXTI_Line15)!=RESET)
                     EXTI_ClearFlag(EXTI_Line15);
      }

      else
      {
            if (EXTI_GetITStatus(EXTI_Line11)!=RESET)
            {
                     row=rowflag;
                     rowflag=5;
                     endflag=1;
                     EXTI_ClearFlag(EXTI_Line11);
            }
            if (EXTI_GetITStatus(EXTI_Line12)!=RESET)
            {
                     row=rowflag;
                     rowflag=5;
                     endflag=1;
                     EXTI_ClearFlag(EXTI_Line12);
            }
            if (EXTI_GetITStatus(EXTI_Line13)!=RESET)
            {
                     row=rowflag;
                     rowflag=5;
                     endflag=1;
                     EXTI_ClearFlag(EXTI_Line13);
            }
            if (EXTI_GetITStatus(EXTI_Line14)!=RESET)
            {
   row=rowflag;
                     rowflag=5;
                     endflag=1;
                     EXTI_ClearFlag(EXTI_Line14);
            }
            if (EXTI_GetITStatus(EXTI_Line15)!=RESET)
            {
                     row=rowflag;
                     rowflag=5;
                     endflag=1;
                     EXTI_ClearFlag(EXTI_Line15);
      }
            if(xianshi[row][lin]!='=')
            { str[m++]=xianshi[row][lin];
               g=xianshi[row][lin];}
else
               s=displaynum(str,m);

}

利用巧妙的算法來進行計算器的計算，準確輸出到12864屏幕上。想要的可以下載。

全部資料51hei下載地址：

33.7z (49.52 KB, 下載次數(shù): 20)

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