Screen brightness setter for 3DS

BriSet.c

#include <3ds.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>


int main()
{
    gfxInit(GSP_RGBA8_OES, GSP_RGBA8_OES, false);
    
    PrintConsole console;
    consoleInit(GFX_BOTTOM, &console);
    
    int redraw = 1;
    u32 kDown = 0;
    
    u8 bri = 1;
    
    u32 regtop = 0x202240;
    u32 regbot = 0x202A40;
    
    while(aptMainLoop())
    {
        hidScanInput();
        kDown = hidKeysDown();
        if(kDown & KEY_SELECT) break;
        
        if(kDown & KEY_UP) bri++;
        if(kDown & KEY_DOWN) bri--;
        if(kDown & KEY_LEFT) bri-=0x10;
        if(kDown & KEY_RIGHT) bri+=0x10;
        
        if(kDown & KEY_X)
        {
            u32 dmy = bri;
            GSPGPU_WriteHWRegs(regtop, &dmy, 4);
        }
        
        if(kDown & KEY_Y)
        {
            u32 dmy = bri;
            GSPGPU_WriteHWRegs(regbot, &dmy, 4);
        }
        
        if(kDown) redraw = 1;
        
        if(redraw)
        {
            console.cursorX = 0;
            console.cursorY = 0;
            
            u32 britop = 0xF00FCACE;
            u32 bribot = 0xF00FCACE;
            
            GSPGPU_ReadHWRegs(regtop, &britop, 4);
            GSPGPU_ReadHWRegs(regbot, &bribot, 4);
            
            printf("REG: %02X\nTOP: %02X\nBOT: %02X\n", bri, britop, bribot);
            
            redraw = 0;
        }
        
        gspWaitForVBlank();
    }
    
    ded:
    
    gfxExit();
    
    return 0;
}