input/Touch_Pad/touch_test/source/main.c

#include <nds.h>
#include <stdio.h>
#include <string.h>

SpriteEntry OAMCopy[128];

#include "ballpalette_bin.h"
#include "balldata_bin.h"

//---------------------------------------------------------------------------------
void initOAM(void) {
//---------------------------------------------------------------------------------
    int i;

    for(i = 0; i < 128; i++) {
        OAMCopy[i].attribute[0] = ATTR0_DISABLED;
    }   
}

//---------------------------------------------------------------------------------
void updateOAM(void) {
//---------------------------------------------------------------------------------
    
    memcpy(OAM, OAMCopy, 128 * sizeof(SpriteEntry));
}


volatile int frame = 0;

enum { CONTINUOUS, SINGLE } TouchType = CONTINUOUS;

//---------------------------------------------------------------------------------
void Vblank() {
//---------------------------------------------------------------------------------
    frame++;
}
 
//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------
    int min_x  = 4096 , min_y  = 4096, max_x  = 0, max_y   = 0;
    int min_px = 4096 , min_py = 4096, max_px = 0 , max_py = 0;
    touchPosition touch;

    // put the main screen on the bottom lcd
    lcdMainOnBottom();

    initOAM();
    //enable vram and map it to the right places
    vramSetMainBanks(   VRAM_A_MAIN_SPRITE,        //A and B maped consecutively as sprite memory
                        VRAM_B_MAIN_SPRITE,        //this gives us 256KB which is the max
                        VRAM_C_MAIN_BG_0x06000000,  //map C to background memory
                        VRAM_D_LCD                 //not using D
                        ); 
   
   //set the video mode
    videoSetMode(  MODE_0_2D | 
                   DISPLAY_SPR_ACTIVE |     //turn on sprites
                   DISPLAY_BG0_ACTIVE |     //turn on background 0
                   DISPLAY_SPR_1D           //this is used when in tile mode
                    );

    int i;
    
    // Sprite initialisation
    for(i = 0; i < 256; i++)
        SPRITE_PALETTE[i] = ((u16*)ballpalette_bin)[i];

    for(i = 0; i< 32*16; i++)
        SPRITE_GFX[i] = ((u16*)balldata_bin)[i];

 
    consoleInit(0, 0,BgType_Text4bpp, BgSize_T_256x256, 31,0, true, true); 
 
    iprintf("\x1b[4;8HTouch Screen Test");
    iprintf("\x1b[15;4HRight Shoulder toggles");
 
    while(1) {

        swiWaitForVBlank();
        updateOAM();

        // read the button states
        scanKeys();

        // read the touchscreen coordinates
        touchRead(&touch);
        
        int pressed = keysDown();   // buttons pressed this loop
        int held = keysHeld();      // buttons currently held

        // Right Shoulder button toggles the mode
        if ( pressed & KEY_R) TouchType ^= SINGLE;

        iprintf("\x1b[14;4HTouch mode: %s",TouchType==CONTINUOUS?"CONTINUOUS ":"SINGLE SHOT");

        iprintf("\x1b[6;5HTouch x = %04X, %04X\n", touch.rawx, touch.px);
        iprintf("\x1b[7;5HTouch y = %04X, %04X\n", touch.rawy, touch.py);       

        iprintf("\x1b[0;18Hkeys: %08X\n", keysHeld());
        iprintf("\x1b[9;10HFrame %d\n", frame);

        if ( TouchType == SINGLE && !(pressed & KEY_TOUCH) ) continue;

        if ( !(held & KEY_TOUCH) || touch.rawx == 0 || touch.rawy == 0) continue;
        
        iprintf("\x1b[12;12H(%d,%d)      ",touch.px,touch.py);

        if ( touch.rawx > max_x)        max_x = touch.rawx;
        if ( touch.rawy > max_y)        max_y = touch.rawy;
        if ( touch.px > max_px) max_px = touch.px;
        if ( touch.py > max_py) max_py = touch.py;

        if ( touch.rawx < min_x)        min_x = touch.rawx;
        if ( touch.rawy < min_y)        min_y = touch.rawy;
        if ( touch.px < min_px) min_px = touch.px;
        if ( touch.py < min_py) min_py = touch.py;

        iprintf("\x1b[0;0H(%d,%d)      ",min_px,min_py);
        iprintf("\x1b[1;0H(%d,%d)      ",min_x,min_y);
        iprintf("\x1b[22;21H(%d,%d)",max_x,max_y);
        iprintf("\x1b[23;23H(%d,%d)",max_px,max_py);

        OAMCopy[0].attribute[2] = 0;
        OAMCopy[0].attribute[1] = ATTR1_SIZE_32 |((touch.px - 16) & 0x01FF);
        OAMCopy[0].attribute[0] = ATTR0_COLOR_256 | ATTR0_SQUARE | ((touch.py -16) & 0x00FF);
        
    }
    
 
    return 0;
}