我用矩阵键盘的状态机写法，但是有一列根本检测不出，这是什么情况，请各位大佬指教

显示全部楼层 · 2021-1-27 06:20:34

#include
#include
#definekey_state_00
#definekey_state_11
#definekey_state_22
#definekeyP3
charkeyresult();
voidmain()
{

unsignedcharkey_val;
while(1)
{
P2=0XA0;P2=0X1F;P0=0X00;
key_val=keyresult();
if(key_val==1){P2=0X80;P2=0X1F;P0=0X00;}
}
}
charkeyresult(void)
{
staticcharkey_state=0;
unsignedcharkey_return=0,key_press;
unsignedcharkey1,key2;
key=0Xf0;
key1=key&0Xf0;
key=0X0f;
key2=key&0X0f;
key_press=key1|key2;
switch(key_state)
{
casekey_state_0:
if(key_press!=0XFF)key_state=key_state_1;break;
casekey_state_1:
if(key_press!=0XFF)
{
if(key_press==0X7e)key_return=1;
if(key_press==0Xdd)key_return=2;
key_state=key_state_2;
}
else
key_state=key_state_0;
break;
casekey_state_2:
if(key_press==0XFF)
{
key_state=key_state_0;
}
break;
}
returnkey_return;
}
分 -->

千问 · 2021-1-27 06:20:34

charkeyresult(void)
{
staticcharkey_state=0;
unsignedcharkey_return=0,key_press;
unsignedcharkey1,key2;
key=0Xf0;
key1=key&0Xf0;
key=0X0f;
key2=key&0X0f;
key_press=key1|key2;
switch(key_state)//这个switch(key_state)有意义？

千问 · 2021-1-27 06:20:34

引用1楼dceacho的回复:
charkeyresult(void)
{
staticcharkey_state=0;
unsignedcharkey_return=0,key_press;
unsignedcharkey1,key2;
key=0Xf0;
key1=key&0Xf0;
key=0X0f;
key2=key&0X0f;
key_press=key1|key2;
switch(key_state)//这个switch(key_state)有意义？

有哇，判断状态消抖啊

千问 · 2021-1-27 06:20:34

引用2楼qq_42681825的回复:Quote: 引用1楼dceacho的回复:
charkeyresult(void)
{
staticcharkey_state=0;
unsignedcharkey_return=0,key_press;
unsignedcharkey1,key2;
key=0Xf0;
key1=key&0Xf0;
key=0X0f;
key2=key&0X0f;
key_press=key1|key2;
switch(key_state)//这个switch(key_state)有意义？

有哇，判断状态消抖啊
我还以为局部static会每次初始化
P37,P30
P35,P31
这两个按键有个没反应？

千问 · 2021-1-27 06:20:34

矩阵键盘应该逐线输出，然后读入判断