按键处理函数

缺乏、安全感 2024-04-17 05:30 48阅读 0赞

\#define key\_state\_1 1

\#define key\_state\_2 2

\#define key\_state\_3 3

\#define key\_no 0

\#define key\_click 1

\#define key\_double 2

\#define key\_long 3

\#define key\_input P30

static unsigned char key\_driver(void)

static unsigned char key\_state\_buffer1 = key\_state\_0;

static unsigned char key\_timer\_cnt1 = 0;

unsigned char key\_return = key\_no;

unsigned char key;

key = key\_input;   //read the I/O states

switch(key\_state\_buffer1)

case key\_state\_0:

if(key == 0)

key\_state\_buffer1 = key\_state\_1;

//按键被按下，状态转换到按键消抖和确认状态//

break;

case key\_state\_1:

if(key == 0)

key\_timer\_cnt1 = 0;

key\_state\_buffer1 = key\_state\_2;

//按键仍然处于按下状态

//消抖完成，key\_timer开始准备计时

//状态切换到按下时间计时状态

else

key\_state\_buffer1 = key\_state\_0;

//按键已经抬起，回到按键初始状态

break;   //完成软件消抖

case key\_state\_2:

if(key == 1)

key\_return = key\_click;   //按键抬起，产生一次click操作

key\_state\_buffer1 = key\_state\_0;   //转换到按键初始状态

else if(++key\_timer\_cnt1 >= 100)   //按键继续按下，计时超过1000ms

key\_return = key\_long;   //送回长按事件

key\_state\_buffer1 = key\_state\_3;   //转换到等待按键释放状态

break;

case key\_state\_3:   //等待按键释放

if(key == 1)   //按键释放

key\_state\_buffer1 = key\_state\_0;   //切回按键初始状态

break;

return key\_return;

unsigned char key\_read(void)

static unsigned char key\_state\_buffer2 = key\_state\_0;

static unsigned char key\_timer\_cnt2 = 0;

unsigned char key\_return = key\_no;

unsigned char key;

key = key\_driver();

switch(key\_state\_buffer2)

case key\_state\_0:

if(key == key\_click)

key\_timer\_cnt2 = 0;   //第一次单击，不返回，到下个状态判断是否会出现双击

key\_state\_buffer2 = key\_state\_1;

else

key\_return = key;   //对于无键、长按，返回原事件

break;

case key\_state\_1:

if(key == key\_click)   //又一次单击，时间间隔小于500ms

key\_return = key\_double;   //返回双击事件，回到初始状态

key\_state\_buffer2 = key\_state\_0;

else if(++key\_timer\_cnt2 >= 50)

//这里500ms内肯定读到的都是无键事件，因为长按大于1000ms

//在1s前底层返回的都是无键

key\_return = key\_click;   //500ms内没有再次出现单击事件，返回单击事件

key\_state\_buffer2 = key\_state\_0;   //返回初始状态

break;

return key\_return;

\---------------------

作者：沉默的小宇宙

来源：CSDN

原文：https://blog.csdn.net/qq997758497/article/details/80606710

http://blog.sina.com.cn/s/blog\_e1d2ec4f0102ziw1.html"

按键处理函数

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