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)
2019-7-28 17:54 上傳
點擊文件名下載附件
下載積分: 黑幣 -5
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