/*

Copyright (c) 2010, Shawn McGregor All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

MAX7219.c

*/

#include <p18cxxx.h>
#include <spi.h>
#include "max7219.h"


/******************************************************************
*
* MAX7219 Display Init
*
******************************************************************/

void MAX7219_InitBCD(void)
{
   SPI_CS = 0; 								// chip select

   OpenSPI(SPI_FOSC_16, MODE_00, SMPEND);				// spi startup
   
   MAX7219_Write (Reg_Decode,0xff);      				// set no bcd decode

   MAX7219_SetBrightness (Intensity_Max);   				// set max brightness
   
   MAX7219_Write (Reg_Scanlimit,7);       				// set scan limit all 8 digits

   MAX7219_Wakeup ();         						// set normal operation
   
   MAX7219_StopDisplayTest ();   					// stop display test

   MAX7219_Clear ();            					// clear the Display
 
   SPI_CS = 1;
}

/******************************************************************
*
* MAX7219 Write to display
*
******************************************************************/

void MAX7219_Write(unsigned char reg_address, unsigned char dataout)
{
   SPI_CS = 0;      							// send CS low to trasmit data
   
   MAX7219_SendByte (reg_address);   					// write register address

   MAX7219_SendByte (dataout);      					// write data   
   
   SPI_CS = 1;      							// send CS to high to latch in 16 bits of data
}

/******************************************************************
*
* MAX7219 put byte to SPI
*
******************************************************************/

void MAX7219_SendByte(unsigned char dataout)
{
   putcSPI (dataout); 							// write data byte via SDO   
}

/******************************************************************
*
* MAX7219 Clear Display
*
******************************************************************/

void MAX7219_Clear(void)
{
   char i;
   
   for(i=0;i<9;i++)
   {
      MAX7219_Write(i,0x00);   						// clear all 8 digits
   }   
}

/******************************************************************
*
* MAX7219 Shutdown display(power save)
*
******************************************************************/

void MAX7219_Shutdown(void)
{
   MAX7219_Write (Reg_Shutdown,0x00); 					// set display in shutdown
}

/******************************************************************
*
* MAX7219 Wakeup display
*
******************************************************************/

void MAX7219_Wakeup(void)
{
   MAX7219_Write (Reg_Shutdown,0x01); 					// set display in normal operation mode   
}

/******************************************************************
*
* MAX7219 Set the display brightness 1-15 levels
*
******************************************************************/

void MAX7219_SetBrightness(char brightness)
{
   brightness &= Intensity_Max;

   MAX7219_Write (Reg_Intensity, brightness); 				// set display brightness
}

/******************************************************************
*
* MAX7219 Start Display Test
*
******************************************************************/

void MAX7219_StartDisplayTest(void)
{
   MAX7219_Write (Reg_DisplayTest, 0x01); 				// start the display test
}

/******************************************************************
*
* MAX7219 Stop Display Test
*
******************************************************************/

void MAX7219_StopDisplayTest(void)
{
   MAX7219_Write (Reg_DisplayTest, 0x00); 				// stop the display test   
}