Miscellany

#include <nds.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <nds/arm9/console.h>   //basic print funcionality

// #define MYBASE 8
// #define MYOFFSET 31

int main (void)
{
    touchPosition touchXY;

    powerON (POWER_ALL);

    videoSetMode (MODE_5_2D | DISPLAY_BG0_ACTIVE | DISPLAY_BG3_ACTIVE);
    videoSetModeSub (0);
    vramSetBankA (VRAM_A_MAIN_BG);
    vramSetBankB (VRAM_B_MAIN_BG);

    int mybase = 0;
    int myoffset = 31;
    int i, j;

    while (1)
    {
        scanKeys ();
        if (keysDown () & KEY_A)
        {
            mybase++;
            // SUB_BG0_CR = BG_MAP_BASE (31);
            BG3_CR = BG_BMP16_256x256 | BG_PRIORITY_3;
            BG0_CR =
                BG_MAP_BASE (mybase +
                             myoffset) | BG_TILE_BASE (mybase) | BG_PRIORITY_0;

            BG3_XDX = 1 << 8;
            BG3_XDY = 0;
            BG3_YDX = 0;
            BG3_YDY = 1 << 8;

            BG_PALETTE[255] = RGB15 (31, 31, 31);       //by default font will be rendered with color 255

            consoleInitDefault ((u16 *) SCREEN_BASE_BLOCK (mybase + myoffset),
                                (u16 *) CHAR_BASE_BLOCK (mybase), 16);

            for (i = 0; i < 192; i++)
            {
                //BG_GFX[i] = RGB15(31,0,31);
                for (j = 0; j < 256; j++)
                {
                    if (i == 20)
                        BG_GFX[j + (256 * i)] = RGB15 (31, 31, 31) | BIT (15);
                    else if (i == 172)
                        BG_GFX[j + (256 * i)] = RGB15 (0, 0, 31) | BIT (15);
                    else
                        BG_GFX[j + (256 * i)] =
                            RGB15 (0, 0, 31 - (int) (i * 0.16)) | BIT (15);
                }
            }

            touchXY = touchReadXY ();
            iprintf ("\x1b[10;0HTouch x = %04X, %04X\n", touchXY.x, touchXY.px);
            iprintf ("Touch y = %04X, %04X\n", touchXY.y, touchXY.py);

        }
    }

    return 0;
}