/*=====================================================================
#
# EECS461 at the University of Michigan
# Blinky Demo
#
# Created 1-06-08, John W. Schmotzer
#
# Revision History:
#
=====================================================================*/


typedef union siu_pcr_u {

	/* Pad Configuration Registers */
	volatile unsigned short R;
						
	struct {
		volatile unsigned short :3; // Unused bits
		volatile unsigned short PA:3;
		volatile unsigned short OBE:1;
		volatile unsigned short IBE:1;
		volatile unsigned short DSC:2;
		volatile unsigned short ODE:1;
		volatile unsigned short HYS:1;
		volatile unsigned short SRC:2;
		volatile unsigned short WPE:1;
		volatile unsigned short WPS:1;
	} B;

} PCR;


void main()
{
	volatile PCR* config; /* Pointer for address of PCR "array" (elements 16-bit) */
	volatile char* GPDO; /* char should be 8-bit */
	volatile char* GPDI;
	int i, counter;


	/* INITIALIZATION */

	

	config = (PCR *)0xC3F90040; /* Sets the first element address of the array */
	GPDO = (char *)0xC3F90600;
	GPDI = (char *)0xC3F90800;

	for(i = 28; i <= 32; i++) /* can use up to pad 43 */
	{ /* Students should initialize at least 5 output pads */
		config[i].B.PA = 0b00;
		config[i].B.OBE = 1;		/* enable output buffer */
		GPDO[i] = 0;						/* write bit */
	}
	/* PROGRAM LOOP -  Make all the LED's blink in unison */

	while(1)
	{
for(i = 0; i<= 4000000; i++)
{/*makes LED's blink with period .1 sec*/
	if(i<(2000000))
		{
		GPDO[28] = 0x1;
		GPDO[29] = 0x1;
		GPDO[30] = 0x1;
		GPDO[31] = 0x1;
		GPDO[32] = 0x1;
		}
	else
		{
		GPDO[28] = 0x0;
		GPDO[29] = 0x0;
		GPDO[30] = 0x0;
		GPDO[31] = 0x0;
		GPDO[32] = 0x0;


	}

	return;
}

// EOF