GPIO按键的长按、短按、连发—

不借助GPIO中断，采用轮询的方式，实现按键的长按、短按、连发

参考：https://blog.csdn.net/qq_31151689/article/details/85228441

百度快照：http://cache.baiducontent.com/c?m=9d78d513d99603f405fa950e1a66d571695297134dc0a46468d5e35fe3654c324171e2cb30521213a3c36b6671b83958fd814765367337c799dff84ccabae27938895723061d913666c46facdc3023d567d004e6f55fa1f8b12592ddcfce8f0a0e9f44050dd1b1dd061714bd33a7522ca0e58e4f615e13b9ea3361f5526a7adf651be719aefd643941d2ad831d51c92dd0611b91a936&p=85769a479d8211a05bed9362544f97&newp=90759a46d6c416e04ea4f82d02148f231610db2151d7d31f6b82c825d7331b001c3bbfb423261403d7cf7d6604af4f5beef7307237012ba3dda5c91d9fb4c57479df68223970&user=baidu&fm=sc&query=gpio%B0%B4%BC%FC%B3%A4%B0%B4%B6%CC%B0%B4C%D3%EF%D1%D4&qid=a2d95b6400011865&p1=8

#include <stdio.h>
#include <time.h>// 定义长按键的TICK数, 以及连发间隔的TICK数, 单位是毫秒ms
#define KEY_DEBOUNCE_PERIOD     20   // 延时消抖时间
#define KEY_LONG_PERIOD         1000
#define KEY_CONTINUE_PERIOD     200#define TRUE    1
#define FALSE   0typedef unsigned int Bool;typedef enum {LOW = 0,HIGH
} KEY_LEVEL_E;typedef enum
{KEY1 = 0,KEY2,KEY3,KEY4,KEY_MAX_NUM
} KEY_NUM_E;// 定义按键返回值状态(按下,长按,连发,释放,无动作)
typedef enum {KEY_NULL = 0,KEY_DOWN,KEY_LONG,KEY_CONTINUE,KEY_UP
} KEY_VALUE_E;typedef enum {KEY_STATE_INIT = 0,KEY_STATE_WOBBLE,KEY_STATE_PRESS,KEY_STATE_LONG,KEY_STATE_CONTINUE,KEY_STATE_RELEASE
} KEY_STATE_E;typedef struct
{KEY_NUM_E eKeyId;KEY_LEVEL_E eKeyLevel;         //key level(low or high)unsigned int downTick;unsigned int upTick;KEY_STATE_E eKeyCurState;      //key cur state(fsm)KEY_STATE_E eKeyLastState;     //key last state(fsm)Bool bStateChangedFlag;        //state changed flagKEY_VALUE_E eLastKeyValue;     //key value
} KEY_HANDLE_T;typedef void (*pf)(void);typedef struct
{pf keyDownAction;pf keyLongAction;pf keyContinueAction;pf keyUpAction;
} KEY_FUNCTION_T;KEY_HANDLE_T keyList[KEY_MAX_NUM] =
{{KEY1, LOW, 0, 0, KEY_STATE_INIT, KEY_STATE_INIT, FALSE, KEY_NULL},{KEY2, LOW, 0, 0, KEY_STATE_INIT, KEY_STATE_INIT, FALSE, KEY_NULL},{KEY3, LOW, 0, 0, KEY_STATE_INIT, KEY_STATE_INIT, FALSE, KEY_NULL},{KEY4, LOW, 0, 0, KEY_STATE_INIT, KEY_STATE_INIT, FALSE, KEY_NULL}
};// 用于获取当前时间, 单位是毫秒ms
unsigned int getTime0(void)
{struct timespec time;clock_gettime(CLOCK_MONOTONIC, &time);return ((time.tv_sec * 1000) + (time.tv_nsec/1000000));
}unsigned int timeDiffFromNow(unsigned int time0)
{unsigned int cur = 0;struct timespec time;clock_gettime(CLOCK_MONOTONIC, &time);cur = (time.tv_sec * 1000) + (time.tv_nsec/1000000);return cur - time0;
}void keyScan(KEY_HANDLE_T* key)
{// gpioReadPin()需根据你的平台来写if(HIGH == gpioReadPin(key->eKeyId)){// 根据原理图, HIGH代表松开key->eKeyLevel = HIGH;}else{// 根据原理图, LOW代表按下key->eKeyLevel = LOW;}// 获取当前key是按下还是松开KEY_LEVEL_E level = key->eKeyLevel;key->eLastKeyValue = KEY_NULL;switch(key->eKeyCurState){case KEY_STATE_INIT:if(LOW == level){key->downTick = getTime0();key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_WOBBLE;}break;case KEY_STATE_WOBBLE:if(LOW == level){if(timeDiffFromNow(key->downTick) >= KEY_DEBOUNCE_PERIOD){key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_PRESS;}}else{key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_INIT;}break;case KEY_STATE_PRESS:if(TRUE == key->bStateChangedFlag){key->bStateChangedFlag = FALSE;key->eLastKeyValue = KEY_DOWN;}if(LOW == level){if(timeDiffFromNow(key->downTick) >= KEY_LONG_PERIOD){key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_LONG;}}else{key->upTick = getTime0();key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_RELEASE;}break;case KEY_STATE_LONG:if(TRUE == key->bStateChangedFlag){key->bStateChangedFlag = FALSE;key->eLastKeyValue = KEY_LONG;}if(LOW == level){if(timeDiffFromNow(key->downTick) >= (KEY_LONG_PERIOD + KEY_CONTINUE_PERIOD)){key->downTick = getTime0();key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_CONTINUE;}}else{key->upTick = getTime0();key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_RELEASE;}break;case KEY_STATE_CONTINUE:if(TRUE == key->bStateChangedFlag){key->bStateChangedFlag = FALSE;key->eLastKeyValue = KEY_CONTINUE;}if(LOW == level){if(timeDiffFromNow(key->downTick) >= KEY_CONTINUE_PERIOD){key->downTick = getTime0();key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_CONTINUE;}}else{key->upTick = getTime0();key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_RELEASE;}break;case KEY_STATE_RELEASE:if(timeDiffFromNow(key->upTick) >= KEY_DEBOUNCE_PERIOD) // 松开按键也来个消抖{if(TRUE == key->bStateChangedFlag){key->bStateChangedFlag = FALSE;key->eLastKeyValue = KEY_UP;}key->bStateChangedFlag = TRUE;key->eKeyCurState = KEY_STATE_INIT;}else{if(LOW == level){key->eKeyCurState = key->eKeyLastState;}}break;default:break;}key->eKeyLastState = key->eKeyCurState;
}void key1DownAction(void)
{printf("%s\n", __FUNCTION__);
}void key1LongAction(void)
{printf("%s\n", __FUNCTION__);
}void key1ContinueAction(void)
{printf("%s\n", __FUNCTION__);
}void key1UpAction(void)
{printf("%s\n", __FUNCTION__);
}void key2DownAction(void)
{printf("%s\n", __FUNCTION__);
}void key2LongAction(void)
{printf("%s\n", __FUNCTION__);
}void key2ContinueAction(void)
{printf("%s\n", __FUNCTION__);
}void key2UpAction(void)
{printf("%s\n", __FUNCTION__);
}void key3DownAction(void)
{printf("%s\n", __FUNCTION__);
}void key3LongAction(void)
{printf("%s\n", __FUNCTION__);
}void key3ContinueAction(void)
{printf("%s\n", __FUNCTION__);
}void key3UpAction(void)
{printf("%s\n", __FUNCTION__);
}void key4DownAction(void)
{printf("%s\n", __FUNCTION__);
}void key4LongAction(void)
{printf("%s\n", __FUNCTION__);
}void key4ContinueAction(void)
{printf("%s\n", __FUNCTION__);
}void key4UpAction(void)
{printf("%s\n", __FUNCTION__);
}KEY_FUNCTION_T keyMapList[KEY_MAX_NUM] =
{{key1DownAction, key1LongAction, key1ContinueAction, key1UpAction}, //KEY1{key2DownAction, key2LongAction, key2ContinueAction, key2UpAction}, //KEY2{key3DownAction, key3LongAction, key3ContinueAction, key3UpAction}, //KEY3{key4DownAction, key4LongAction, key4ContinueAction, key4UpAction}, //KEY4
};void keyMapHandle(KEY_HANDLE_T *key, KEY_FUNCTION_T *keyMap)
{unsigned char keyValue = key->eLastKeyValue;if(KEY_NULL == keyValue){return;}else{switch(keyValue){case KEY_DOWN:if(keyMap->keyDownAction != NULL){keyMap->keyDownAction();}break;case KEY_LONG:if(keyMap->keyLongAction != NULL){keyMap->keyLongAction();}break;case KEY_CONTINUE:if(keyMap->keyContinueAction != NULL){keyMap->keyContinueAction();}break;case KEY_UP:if(keyMap->keyUpAction != NULL){keyMap->keyUpAction();}break;default:break;}}
}int main(void)
{KEY_NUM_E keyId = KEY_MAX_NUM;while(1){for(keyId=KEY1; keyId<KEY_MAX_NUM; keyId++){keyScan(&keyList[keyId]);}for(keyId=KEY1; keyId<KEY_MAX_NUM; keyId++){keyMapHandle(&keyList[keyId], &keyMapList[keyId]);}usleep(10*1000);}return 0;
}

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GPIO按键的长按、短按、连发——C程序

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