////////////////////////////////////////////////////////////////
// void Five_Lights (char *globalOutput)
//
//	Function: 			Uses a state machine approach with
//				15 states. A switch statement evaluates what
//				action should be taken for each state. The state
//				value is kept in a static int variable so that
//				the value remains upon the next entry into the
//				function without using global variables. Every
//				state will then increment to the next state
//				except for the last state, which will reset to state 0.
//				Each state is equivalent of 250 ms from the 
//				msleep in the main() function's while(1) loop.	
//
//				LED operation: (X means ON)
//				LEDs 7 6 5 4 3 2 1 0 (Bargraph)
//					   X		- 500 ms  
//					   X X		- 500 ms  
//					   X X X	- 500 ms  
//					   X X X X	- 500 ms  
//					   X X X X X	- 500 ms  
//					     		- 500 ms  
//
// 	Parameters: char *globalOutput - 	variable from main program
//				passed as a call-by-reference parameter;
//				current pattern of LEDs, gets changed in this 
//				function and by reference changes the original.
//
//	Returns: NONE
//
////////////////////////////////////////////////////////////////
void Five_Lights (char *globalOutput)
{
	// static variable for state, value remains even after exit 
	//	and for the next entry into function
	static int nState = 0;		
	
	// switch statement to evaluate state machine states
	switch ( nState )
	{
		case 0:	// LED #4 ON
		case 1:	// for 500 ms
			*globalOutput = 0x10;
			break;
		case 2: // add LED #3 ON
		case 3: // for 500 ms
			*globalOutput = 0x18;
			break;
		case 4: // add LED #2 ON
		case 5: // for 500 ms
			*globalOutput = 0x1C;
			break;
		case 6: // add LED #1 ON
		case 7: // for 500 ms
			*globalOutput = 0x1E;
			break;
		case 8: // add LED #0 ON
		case 9: // for 500 ms
			*globalOutput = 0x1F;
			break;
		case 10: // LEDs 4-0 OFF
		case 11: // for 500 ms
			*globalOutput = 0x00;
			break;
		case 12: // Wait total of 1 second (1000 ms)
		case 13: // before restarting state cycle
		case 14:
		case 15:
			break;
	}
	// if not in last state, then increment to next state
	if ( nState < 15 ) 
	{
		nState++;
	}
	// if in last state, restart back at state 0
	else
	{
		nState = 0;
	}

}


////////////////////////////////////////////////////////////////
// void Output_LEDs ( char outLED1, char outLED2 )
//
// Function: To set LED Bargraphs 1 & 2 from the data in outLED1 and outLED2
// Parameters: char outLED1 - output to send to LED Bargraph 1 in format of 1=ON, 0=OFF
//             char outLED2 - output to send to LED Bargraph 2 in format of 1=ON, 0=OFF
//
//Returns: none
////////////////////////////////////////////////////////////////

void Output_LEDs ( char outLED1, char outLED2)
{
                *pLEDOut1 = ~outLED1;   // invert output to LED Bargraph 1
                *pLEDOut2 = ~outLED2;   // invert output to LED Bargraph 2
}