/**
	fader.c

	A busy looping program to fade the led using the opb_timer's pwm


	NOTE:
	As best I can tell, the documentation regarding the pwm period and duty cycle calculations
	regarding up-counting vs. downcounting is backwards.  This code assumes that this is
	the case
*/

/* include the low level driver for the timer/counter */
#include <xtmrctr_l.h>


/* include the parameters specific to this design including the
   base address of the timer/counter peripheral
*/
#include <xparameters.h>






#define TIME_WASTE_COUNT 80000

void waste_time(void)
{
    int i;
    for(i=0; i<TIME_WASTE_COUNT; i++) {}
}






int main(void)
{
    int i;
    int climbing = 1;
	int duty_value = 1;


	/* TODO: set the timers load registers to good starting values */


    /* These lines cause the timers to load their load register values
    the first time  Note that these bits will have to be set back to
    0 before the timers will run, but you'll probably end up setting them
    to 0 with your next call to XTmrCtr_mSetControlStatusReg */
	XTmrCtr_mSetControlStatusReg(XPAR_THE_TIMER_BASEADDR, 0, XTC_CSR_LOAD_MASK);
	XTmrCtr_mSetControlStatusReg(XPAR_THE_TIMER_BASEADDR, 1, XTC_CSR_LOAD_MASK);





	/* TODO: set both timer control registers with the proper flags for
	pwm mode, probably counting down.  Note that you don't have to set the
	auto reload flag. */


    for(;;)
    {
		waste_time();


		/* TODO: calculate the next duty_value for the duty timer */


        XTmrCtr_mSetLoadReg(	XPAR_THE_TIMER_BASEADDR,
								1,
								duty_value);
    }

    /* this will never be reached */
    return 0;
}