//
// More Loops.c
// Exercise 3-1 
// waiting for a button before starting the sequence
//

#include <p24fj128ga010.h>

// 1. define timing constant
#define SHORT_DELAY 100
#define LONG_DELAY	800

// 2. declare and initialize an array with the message bitmap 
char bitmap[30] = { 
	0b11111111,	// H
	0b00001000,
	0b00001000,
	0b11111111,
	0b00000000,
	0b00000000,
	0b11111111,	// E
	0b10001001,
	0b10001001,
	0b10000001,
	0b00000000,
	0b00000000,
	0b11111111,	// L
	0b10000000,
	0b10000000,
	0b10000000,
	0b00000000,
	0b00000000,
	0b11111111,	// L
	0b10000000,
	0b10000000,
	0b10000000,
	0b00000000,
	0b00000000,
	0b01111110,	// O
	0b10000001,
	0b10000001,
	0b01111110,
	0b00000000,
	0b00000000
	};
	
// 3. the main program
main()
{
	// 3.1 variable declarations
	int i;              // i will serve as the index 
	
	// 3.2 initialization
	TRISA =  0;         // all PORTA as output
	T1CON =  0x8030;    // TMR1 on, prescale 1:256 Tclk/2
	
	// 3.3 the main loop   	
	while( 1)
	{
    	// 3.3.0 wait for S3 to be pressed
    	while( _RD6);
    	
		// 3.3.1 display loop, hand moving to the right
		for( i=0; i<30; i++)
		{	// 3.3.1.1 update the LEDs
			PORTA = bitmap[i];
				
			// 3.3.1.2 short pause
			TMR1 = 0;
			while ( TMR1 < SHORT_DELAY)
			{
			}
		} // for i
			
		// 3.3.2 long pause, hand moving back to the left
		PORTA = 0;		// turn LEDs off
		TMR1 = 	0;
		while ( TMR1 < LONG_DELAY)
		{
		}
	} // main loop
} // main