利用单片机外部中断来获取矩阵键盘键值外加可精确到小数点后6位计算器源程序 -

标题: 利用单片机外部中断来获取矩阵键盘键值外加可精确到小数点后6位计算器源程序 [打印本页]

作者: linuxke 时间: 2019-7-28 09:34
标题: 利用单片机外部中断来获取矩阵键盘键值外加可精确到小数点后6位计算器源程序
利用外部中断来获取键值，避免了逐行扫描，减少了cpu的占用。准确的获取键值，运用二维数组来存放键值，让5*5的矩阵键盘输出键值，这个设定的二维数组char xianshi[5][5]={{'(','/','*','-','+'},{')','3','2','1',0},{'6','5','4','0',0},{10,'9','8','7',0},{'=','.','0',11,12}};这位检查行和列：
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;
      }

检查列：
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);

}

利用巧妙的算法来进行计算器的计算，准确输出到12864屏幕上。想要的可以下载。

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