The code snippet for button detection without block delay eliminate jitter for STM32

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Usage

• Modify eliminate jitter delay timebase in header file: #define KEY_DELAY_TIMEBASE (10)

• In STM32 Systick interrupt ISR, each eliminate jitter delay timebase decrement once variable g_uwKeyDelayX10ms.

• Loop call the function keyOperateCmd(), example for in main() robin-round it.

• Implement 3 funtions with prototype:

  • void keyUpHook(RetKeyType_un keyData)
  • void keyDownHook(RetKeyType_un keyData)
  • void keyAlwaysDownHook(RetKeyType_un keyData)

  Example for:

  void KeyDownHook(RetKeyType_un keyData)
  {
  	switch (keyData.ucReadKeyByByte[0])
  	{
  		// Only a button be pressed
  		case 1:
  			switch (keyData.ucReadKeyByByte[1])
  			{
  				case KU_KEY_OK:
  				// Up button be pressed handle code...
  				break;
  
  				case KD_KEY_OK:
  				// Down button be pressed handle code...
  				break;
  
  				case KL_KEY_OK:
  				// Left button be pressed handle code...
  				break;
  
  				case KR_KEY_OK:
  				// Right button be pressed handle code...
  				break;
  
  				case ENTER_KEY_OK:
  				// Enter button be pressed handle code...
  				break;
  
  				case BACK_KEY_OK:
  				// Back button be pressed handle code...
  				break;
  
  				default:
  				break;
  			}
  		break;
  
  		// Two buttons are pressed simultaneously
  		case 2:
  		// Here has 6 buttons, each 2 buttons be pressed simultaneously,
  		// so there are 15 different combinations
  		switch (keyData.ucReadKeyByByte[1] + keyData.ucReadKeyByByte[2])
  		{
  			// KU_KEY_OK + KD_KEY_OK
  			case KD_KEY_OK:
  			break;
  
  			...
  		}
  		break;
  
  		// Other...
  		default:
  		break;
  	}
  }

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