You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
3.1 KiB
85 lines
3.1 KiB
4 months ago
|
/*
|
||
|
|
* 多个按键检测短按和长按事件
|
||
|
|
* 短按：时间 10ms < T < 1 s, 长按：时间 T >1 s
|
||
|
|
* 功能：使用状态机方式，扫描单个按键；扫描周期为10ms,10ms刚好跳过抖动；
|
||
|
|
* 状态机使用switch case语句实现状态之间的跳转
|
||
|
|
* lock变量用于判断是否是第一次进行按键确认状态
|
||
|
|
* ：按键释放后才执行按键事件
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "bsp_btn.h"
|
||
|
|
#include "bsp_config.h"
|
||
|
|
#include "bsp_config.h"
|
||
|
|
#include "../msp/UART0.h"
|
||
|
|
|
||
|
|
extern KEY_STATE KeyState = KEY_CHECK; // 初始化按键状态为检测状态
|
||
|
|
KEY_TYPE g_KeyActionFlag = NULL_KEY; // 用于区别长按和短按
|
||
|
|
KEY_VALUE g_Key = KEY_NULL;
|
||
|
|
u8 g_KeyFlag = 0; // 按键有效标志，0 无效 1 有效
|
||
|
|
|
||
|
|
static u8 TimeCnt = 0; //10ms为颗粒
|
||
|
|
static u8 lock = 0; //lock变量用于判断是否是第一次进行按键确认状态
|
||
|
|
|
||
|
|
void Key_Scan(void)
|
||
|
|
{
|
||
|
|
static u8 TimeCnt = 0; //10ms为颗粒
|
||
|
|
static u8 lock = 0;
|
||
|
|
switch (KeyState)
|
||
|
|
{
|
||
|
|
//按键未按下状态，此时判断Key的值
|
||
|
|
case KEY_CHECK:
|
||
|
|
if(!Key) //如果按键Key值为0，说明按键开始按下，进入下一个状态
|
||
|
|
{
|
||
|
|
KeyState = KEY_COMFIRM;
|
||
|
|
}
|
||
|
|
TimeCnt = 0; //计数复位
|
||
|
|
lock = 0;
|
||
|
|
break;
|
||
|
|
//按键按下状态确认：
|
||
|
|
case KEY_COMFIRM:
|
||
|
|
if(!Key) //查看当前Key是否还是0，再次确认是否按下
|
||
|
|
{
|
||
|
|
if(!lock) lock = 1; //第一次进来置1
|
||
|
|
TimeCnt ++;
|
||
|
|
// 多按键判断
|
||
|
|
if(0 == key1) g_Key = KEY_UP;
|
||
|
|
else if(0 == key2) g_Key = KEY_DOWN;
|
||
|
|
else if(0 == key3) g_Key = KEY_PWR;
|
||
|
|
|
||
|
|
if(TimeCnt > 200) // 长按 2 s
|
||
|
|
{
|
||
|
|
L0_uart0_uc('#');
|
||
|
|
g_KeyActionFlag = LONG_KEY;
|
||
|
|
TimeCnt = 0;
|
||
|
|
lock = 0; //重新检查
|
||
|
|
KeyState = KEY_RELEASE; // 需要进入按键释放状态
|
||
|
|
}
|
||
|
|
// ???????????????????????
|
||
|
|
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if(lock) //不是第一次进入，释放按键才执行
|
||
|
|
{
|
||
|
|
g_KeyActionFlag = SHORT_KEY; // 短按
|
||
|
|
KeyState = KEY_RELEASE; // 需要进入按键释放状态
|
||
|
|
}
|
||
|
|
else // 当前Key值为1，确认为抖动，则返回上一个状态
|
||
|
|
{
|
||
|
|
KeyState = KEY_CHECK; // 返回上一个状态
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
//按键释放状态
|
||
|
|
case KEY_RELEASE:
|
||
|
|
if(Key) //当前Key值为1，说明按键已经释放，返回开始状态
|
||
|
|
{
|
||
|
|
KeyState = KEY_CHECK;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|