A Mode State Machine

typedef enum _SM_USER_MODE
{
    UM_POWERUP,
    UM_IDLE
} SM_USER_MODE;

static uint8_t CurrentMode = UM_POWERUP;

	static uint8_t CurrentModeLast = 0xff;
	uint8_t JustEnteredNewMode = 0;



	//------------------------------
	//----- CHECK FOR NEW MODE -----
	//------------------------------
	JustEnteredNewMode= 0;
	if (CurrentMode != CurrentModeLast)
	{
		//Flag that we've just entered a new mode
		JustEnteredNewMode = 1;
		CurrentModeLast = CurrentMode;
	}


	//------------------------------------
	//------------------------------------
	//----- PROCESS THE CURRENT MODE -----
	//------------------------------------
	//------------------------------------
	switch (CurrentMode)
	{
	case UM_POWERUP:
		//-------------------
		//-------------------
		//----- POWERUP -----
		//-------------------
		//-------------------
		if (JustEnteredNewMode)
		{
			//----- JUST ENTERED THIS MODE -----

		}
		//------------------------
		//----- PROCESS MODE -----
		//------------------------

		CurrentMode = UM_IDLE;
		break;



	case UM_IDLE:
		//-------------------------------
		//-------------------------------
		//----- IDLE - DEFAULT MODE -----
		//-------------------------------
		//-------------------------------
		if (JustEnteredNewMode)
		{
			//----- JUST ENTERED THIS MODE -----


		}
		//------------------------
		//----- PROCESS MODE -----
		//------------------------



		break;





//<<<<< ADD OTHER MODES HERE



	} //switch (CurrentMode)