/* demonstrate graphics LCD access functions */

#include "ks0108.h"




// upper limit of the stack, which grows down from here.
// Note that virtual byte-address 0x1400 is shown as
// word-address 0x0500 in the MipsRAM editor.
// 
#define STACKBASE 0x00001400    

// a suitable address to store heap and static data.
// Shown at word-address 0x0800 in the MipsRAM editor.
//
#define BASE      0x00002000


/* convert an integer to a four-digit hex-format string. */
char* atox( int i ) {
  char* cp = (char*) (BASE+16);
  int tmp;

  tmp = (i & 0xf000) >> 12;
  *cp++ = (tmp > 9) ? (tmp - 10 + 'A') : (tmp + '0');
  tmp = (i & 0x0f00) >> 8;
  *cp++ = (tmp > 9) ? (tmp - 10 + 'A') : (tmp + '0');
  tmp = (i & 0x00f0) >> 4;
  *cp++ = (tmp > 9) ? (tmp - 10 + 'A') : (tmp + '0');
  tmp = (i & 0x000f) >> 0;
  *cp++ = (tmp > 9) ? (tmp - 10 + 'A') : (tmp + '0');

  return (char*) (BASE+16);

  // *cp++ = ((i & 0xf000) >> 12) + '0';
  // *cp++ = ((i & 0x0f00) >>  8) + '0';
  // *cp++ = ((i & 0x00f0) >>  4) + '0';
  // *cp++ = ((i & 0x000f) >>  0) + '0';
  // return (char*) 0x0000a000;
}



int main( int argc, char** argv ) {
  int i;
  int *ptr;
  char *cptr;

  // write some indication that the program started to the memory,
  // then activate the LC display controller.
  //
  ptr = (int*) BASE;
  *ptr = 0xcccc0000;

  enableDisplay( 1 );

  // select black (active pixel) color for drawing
  // 
  *(ptr-1) = 0xcccc0001;
  setColor( 1 );

  // and activate a few pixels in the first (left) half of the LCD
  // 
  *(ptr-2) = 0xcccc0002;
  setPixel( 0, 0 );
  setPixel( 1, 1 );
  setPixel( 0, 63 );
  setPixel( 62, 62 );
  setPixel( 63,  7 );

  // a few pixels in the second (right) half of the LCD
  // 
  *(ptr-3) = 0xcccc0003;
  setPixel( 125,  1 );
  setPixel( 126,  0 );
  setPixel( 127, 31 );
  setPixel( 127, 63 );

  // a diagonal line built from setPixel() operations
  // 
  *(ptr-4) = 0xcccc0004;
  for( i=0; i < 64; i++ ) {
    setPixel( i, i );
  } 

  for( i=64; i < 128; i++ ) {
    setPixel( i, 128-i-1 );
  }

  // a welcome message
  //
  *(ptr-5) = 0xcccc0005;
  setTextPos( 0, 0 );
  text( "  Welcome to the (Tiny)MIPS" );

  // some more text
  // 
  *(ptr-6) = 0xcccc0006;
  setTextPos( 0, 1 );
  text( "  and the KS0108 display." );

  // endless loop
  // 
  *(ptr-7) = 0xffff0007;

  for( i=0; ; i++ ) {
    *(ptr+1) = 0xbabe0000 + i;
    setTextPos( 2, 7 );
    cptr = atox( i );
    text( cptr );
  }
   
}