/********
 basic.c
 
 contains basic code for 
 sending data to the LCD 
 and drawing single pixels
 
 Copyright 2006 Refik Hadzialic (http://www.e-dsp.com) 
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
 ********/

void sendCMD(byte cmd);
void sendData(byte cmd);
void shiftBits(byte b);
void LCD_put_pixel(unsigned char color, unsigned char x, unsigned char y);

/* 
  crude routine that does blind "bit-banging" on SPI
  it would be ideal to fix this so that the SPI is used properly,
  but adding the delays works for now
*/
void shiftBits(byte b) {

  CLK0
  if ((b&128)!=0) SDA1 else SDA0
  CLK1 

  CLK0
  if ((b&64)!=0) SDA1 else SDA0
  CLK1          

  CLK0
  if ((b&32)!=0) SDA1 else SDA0
  CLK1          

  CLK0
  if ((b&16)!=0) SDA1 else SDA0
  CLK1          

  CLK0
  if ((b&8)!=0) SDA1 else SDA0
  CLK1          

  CLK0
  if ((b&4)!=0) SDA1 else SDA0
  CLK1          

  CLK0
  if ((b&2)!=0) SDA1 else SDA0
  CLK1          

  CLK0
  if ((b&1)!=0) SDA1 else SDA0
  CLK1          

}

// draw a single colored pixel
void LCD_put_pixel(unsigned char color, unsigned char x, unsigned char y){
  x += 2;          // range goes from 2 to 130
  sendCMD(PASET);   // page start/end ram
  sendData(x);            
  sendData(131);          
  sendCMD(CASET);   // column start/end ram
  sendData(y);     // for some reason starts at 2
  sendData(131); 
  sendCMD(RAMWR);
  sendData(color); 
}

//send data
void sendData(byte data) {

  CLK0
  SDA1             //1 for param
  CLK1

  shiftBits(data);
}

//send cmd
void sendCMD(byte data) {

  CLK0
  SDA0             //1 for cmd
  CLK1

  shiftBits(data);
}