putting this here for posterity

lab5_2_marino.c

#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */



#define SL 16 //sequence length
//word is unsigned int
void delay(word d);

word delayTime=2000/SL; //125 ms


void delay(word d)
{
	int constant=350;
	int i;
	while(d>0)
	{
		i = constant;
		while(i>0)
			i--;
		d--;
	}
}

void readButtons()
{
	word delta=500/SL; //32.12 ms
	
	if(PTM_PTM4 == 0)
	{
		delay(10);
		while(PTM_PTM4==0) 	{ ; }
		delay(10);
		
		if(delayTime>=delta)
			delayTime-=delta;
		else
			delayTime=0;
	}
	else if(PTM_PTM5==0)
	{
		delay(10);
		while (PTM_PTM5==0)
		{ ; }
		delay(10);

		delayTime+=delta;
		
	}
}

void main(void)
{
	int i;
	byte patterns[]={0x00,0x01,0x03,0x07,0x0F,0x1F,0x3F,0x7F,0xFF,0x7F,0x1F,0x0F,0x07,0x03,0x01,0x00};
	
	
	DDRA=0xFF; // make all the bits of port A outputs

	//use the folowing to calibrate the delay functions
	//PORTA=0xFF;
	//delay2(10000);
	//PORTA=0x00;

	while(1)
	{
		for(i=0; i<SL; i++)
		{
			PORTA=patterns[i];
			delay(delayTime);
		
			readButtons();
			
		}//end for
	}//end while
}