/*---------------------------------------------------------------------------*
  Project:  TwlSDK - GX - demos - UnitTours/2D_CharBg_1
  File:     main.c

  Copyright 2003-2008 Nintendo. All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Date:: 2008-10-20#$
  $Rev: 9005 $
  $Author: okubata_ryoma $
 *---------------------------------------------------------------------------*/
//---------------------------------------------------------------------------
// A sample that use BG #0 as text mode:
//
// This sample simply displays a sphere on the display.
//
// HOWTO:
// 1. Transfer the character data with GX_LoadBGxChar().
// 2. Transfer the palette data by GX_LoadBGPltt().
// 3. Transfer the screen data by GX_LoadBGxScr().
//
// Do not forget to flush the corresponding cache if you modified the data
// before transfer.
//---------------------------------------------------------------------------

#ifdef SDK_TWL
#include <twl.h>
#else
#include <nitro.h>
#endif
#include "DEMO.h"
#include "data.h"

static u16 sScrnBuf[SCREEN_SIZE];      // Buffer for screen data (BG #0)

#ifdef SDK_TWL
void TwlMain(void)
#else
void NitroMain(void)
#endif
{
    //---------------------------------------------------------------------------
    // Initialize:
    // Enables IRQ interrupts, initializes VRAM, and sets BG #0 for text mode.
    //---------------------------------------------------------------------------
    DEMOInitCommon();
    DEMOInitVRAM();
    DEMOInitDisplayBG0Only();

    //---------------------------------------------------------------------------
    // Transmitting the character data and the palette data
    //---------------------------------------------------------------------------
    GX_LoadBG0Char(d_64_256_bg_schDT, 0, sizeof(d_64_256_bg_schDT));
    GX_LoadBGPltt(d_64_256_bg_sclDT, 0, sizeof(d_64_256_bg_sclDT));

    {
        int     i, j;
        for (i = 0; i < 8; i++)
        {
            for (j = 0; j < 8; j++)
            {
                sScrnBuf[(i * 32) + j] = (u16)((i * 0x10) + j);
            }
        }
    }
    // Store the data in the main memory, and invalidate the cache.
    DC_FlushRange(sScrnBuf, sizeof(sScrnBuf));
    /* I/O register is accessed using DMA operation, so cache wait is not needed */
    // DC_WaitWriteBufferEmpty();

    // DMA transfer to BG #0 screen
    GX_LoadBG0Scr(sScrnBuf, 0, sizeof(sScrnBuf));

    DEMOStartDisplay();

    //---------------------------------------------------------------------------
    // Main Loop
    //---------------------------------------------------------------------------
    while (1)
    {
#ifdef SDK_AUTOTEST
        GX_SetBankForLCDC(GX_VRAM_LCDC_C);
        EXT_TestSetVRAMForScreenShot(GX_VRAM_LCDC_C);
        EXT_TestScreenShot(100, 0xC7953680);
        EXT_TestTickCounter();
#endif //SDK_AUTOTEST

        OS_WaitVBlankIntr();           // Waiting for the end of the VBlank interrupt
        GX_LoadBG0Scr(sScrnBuf, 0, sizeof(sScrnBuf));
    }
}

//---------------------------------------------------------------------------
// VBlank interrupt function:
//
// Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
// OS_EnableIrqMask selects IRQ interrupts to enable, and
// OS_EnableIrq enables IRQ interrupts.
// Notice that you have to call 'OS_SetIrqCheckFlag' to check a VBlank interrupt.
//---------------------------------------------------------------------------
void VBlankIntr(void)
{
    OS_SetIrqCheckFlag(OS_IE_V_BLANK); // Checking VBlank interrupt
}