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;
}