//###########################################################################
//
// FILE:	hardware.c
//
// TITLE:	DSP28 GPIO - Port B7..B0  :, software delay 
//		
//
//###########################################################################

#include "DSP281x_Device.h"

// Prototype statements for functions found within this file.

void delay_loop(long);
void Gpio_select(void);
void InitSystem(void);

void main(void)
{
	unsigned int i;
	unsigned int LED[8]= {0x0001,0x0002,0x0004,0x0008,
	                      0x0010,0x0020,0x0040,0x0080};	
	
	InitSystem();		// Initialize the DSP's core Registers
	
	// Speed_up the silicon A Revision. 
	// No need to call this function for Rev. C  later silicon versions
	
	Gpio_select();		// Setup the GPIO Multiplex Registers

	while(1)
	{    
  	    for(i=0;i<14;i++){
    	if(i<7) 	GpioDataRegs.GPBDAT.all = LED[i];
    	  else  	GpioDataRegs.GPBDAT.all = LED[14-i]; 
    	delay_loop(1000000);
    	}
    }
} 	

void delay_loop(long end)
{
	long i;
	for (i = 0; i < end; i++);
	EALLOW;
	SysCtrlRegs.WDKEY = 0x55;
	SysCtrlRegs.WDKEY = 0xAA;
	EDIS;
	
}

void Gpio_select(void)
{
	EALLOW;
	GpioMuxRegs.GPAMUX.all = 0x0;	// all GPIO port Pin's to I/O
    GpioMuxRegs.GPBMUX.all = 0x0;   
    GpioMuxRegs.GPDMUX.all = 0x0;
    GpioMuxRegs.GPFMUX.all = 0x0;		 
    GpioMuxRegs.GPEMUX.all = 0x0; 
    GpioMuxRegs.GPGMUX.all = 0x0;			
										
    GpioMuxRegs.GPADIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPBDIR.all = 0x00FF;	// GPIO Port B15-B8 input , B7-B0 output
    GpioMuxRegs.GPDDIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPEDIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPFDIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPGDIR.all = 0x0;	// GPIO PORT  as input

    GpioMuxRegs.GPAQUAL.all = 0x0;	// Set GPIO input qualifier values to zero
    GpioMuxRegs.GPBQUAL.all = 0x0;
    GpioMuxRegs.GPDQUAL.all = 0x0;
    GpioMuxRegs.GPEQUAL.all = 0x0;
    EDIS;
}     

void InitSystem(void)
{
   	EALLOW;
   	SysCtrlRegs.WDCR= 0x00AF;		// Setup the watchdog 
   									// 0x00E8  to disable the Watchdog , Prescaler = 1
   									// 0x00AF  to NOT disable the Watchdog, Prescaler = 64
   	SysCtrlRegs.SCSR = 0; 			// Watchdog generates a RESET	
   	SysCtrlRegs.PLLCR.bit.DIV = 10;	// Setup the Clock PLL to multiply by 5
    
   	SysCtrlRegs.HISPCP.all = 0x1; // Setup Highspeed Clock Prescaler to divide by 2
   	SysCtrlRegs.LOSPCP.all = 0x2; // Setup Lowspeed CLock Prescaler to divide by 4
      	
   	// Peripheral clock enables set for the selected peripherals.   
   	SysCtrlRegs.PCLKCR.bit.EVAENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.EVBENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.SCIAENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.SCIBENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.SPIENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.ECANENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.ADCENCLK=0;
   	EDIS;
}

//===========================================================================
// End of SourceCode.
//===========================================================================