/*---------------------------------------------------------------------------*
  Project:  TwlSDK - WM - demos - dataShare-1
  File:     main.c

  Copyright 2006-2009 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.

  $Date:: 2009-06-04#$
  $Rev: 10698 $
  $Author: okubata_ryoma $
 *---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*
    This sample performs wireless data sharing communication using the WM library.
    It automatically connects to a nearby dataShare-1 demo and shares a total of 8 bytes in the wireless communications group: a 4-byte game frame count and a 4-byte picture frame count.
    
    

    HOWTO:
        1. Press the A Button to start communications as a parent.
           As soon as a nearby child with the same dataShare-1 demo is found, data-sharing communication with that child begins automatically.
            Communication with up to 15 children is possible at the same time.
        2. Press the B Button to start communications as a child.
           As soon as a nearby parent with the same dataShare-1 demo is found, communication with that parent begins automatically.
           
        3. If the START button is pressed during a busy screen while a connection is being established, or during a communication screen after a connection is established, the connection is reset, and the display returns to the initial screen.
           
 *---------------------------------------------------------------------------*/

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

#include    <nitro/wm.h>

#include    "font.h"
#include    "wh.h"


/*---------------------------------------------------------------------------*
    Constant Definitions
 *---------------------------------------------------------------------------*/
#define     KEY_REPEAT_START    25     // Number of frames until key repeat starts
#define     KEY_REPEAT_SPAN     10     // Number of frames between key repeats

#define     PICTURE_FRAME_PER_GAME_FRAME    2

#define     DEFAULT_GGID            0x003fff11
#define     NUM_MAX_CHILD           15
#define     DEFAULT_CHAN            1
#define     SHARED_DATA_SIZE        8

/*---------------------------------------------------------------------------*
    Structure Definitions
 *---------------------------------------------------------------------------*/
// Key input data
typedef struct KeyInfo
{
    u16     cnt;                       // Unprocessed input value
    u16     trg;                       // Push trigger input
    u16     up;                        // Release trigger input
    u16     rep;                       // Press and hold repeat input

}
KeyInfo;


/*---------------------------------------------------------------------------*
    Internal Function Definitions
 *---------------------------------------------------------------------------*/
static void GameFrame(void);           // Main loop for game frame
static void ModeSelect(void);          // Parent/child select screen
static void ModeError(void);           // Error display screen
static void ModeWorking(void);         // Busy screen
static void ModeParent(void);          // Parent communications screen
static void ModeChild(void);           // Child communications screen
static void VBlankIntr(void);          // V-Blank interrupt handler
static void PrintSharedData(u16 bitmap);        // Displays shared data

// General purpose subroutines
static void KeyRead(KeyInfo * pKey);
static void ClearString(void);
static void PrintString(s16 x, s16 y, u8 palette, char *text, ...);
static void ColorString(s16 x, s16 y, s16 length, u8 palette);
static void InitializeAllocateSystem(void);


/*---------------------------------------------------------------------------*
    Internal Variable Definitions
 *---------------------------------------------------------------------------*/
static u16 gScreen[32 * 32];           // Virtual screen
static KeyInfo gKey;                   // Key input
static vs32 gPictureFrame;             // Picture frame counter
static vs32 gGameFrame;                // Game frame counter

// Send data buffer (must be 32-Byte aligned)
static u16 gSendBuf[SHARED_DATA_SIZE / sizeof(u16)] ATTRIBUTE_ALIGN(32);


/*---------------------------------------------------------------------------*
  Name:         NitroMain / TwlMain

  Description:  Initialization and main loop.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
#ifdef SDK_TWL
void TwlMain(void)
#else
void NitroMain()
#endif
{
    // Various types of initialization
    OS_Init();
    FX_Init();
    GX_Init();
    GX_DispOff();
    GXS_DispOff();
    
    // Initializes display settings
    GX_SetBankForLCDC(GX_VRAM_LCDC_ALL);
    MI_CpuClearFast((void *)HW_LCDC_VRAM, HW_LCDC_VRAM_SIZE);
    (void)GX_DisableBankForLCDC();
    MI_CpuFillFast((void *)HW_OAM, 192, HW_OAM_SIZE);
    MI_CpuClearFast((void *)HW_PLTT, HW_PLTT_SIZE);
    MI_CpuFillFast((void *)HW_DB_OAM, 192, HW_DB_OAM_SIZE);
    MI_CpuClearFast((void *)HW_DB_PLTT, HW_DB_PLTT_SIZE);

    // 2D display settings for text string display
    GX_SetBankForBG(GX_VRAM_BG_128_A);
    G2_SetBG0Control(GX_BG_SCRSIZE_TEXT_256x256, GX_BG_COLORMODE_16, GX_BG_SCRBASE_0xf800,      // SCR base block 31
                     GX_BG_CHARBASE_0x00000,    // CHR base block 0
                     GX_BG_EXTPLTT_01);
    G2_SetBG0Priority(0);
    G2_BG0Mosaic(FALSE);
    GX_SetGraphicsMode(GX_DISPMODE_GRAPHICS, GX_BGMODE_0, GX_BG0_AS_2D);
    GX_SetVisiblePlane(GX_PLANEMASK_BG0);
    GX_LoadBG0Char(d_CharData, 0, sizeof(d_CharData));
    GX_LoadBGPltt(d_PaletteData, 0, sizeof(d_PaletteData));
    MI_CpuFillFast((void *)gScreen, 0, sizeof(gScreen));
    DC_FlushRange(gScreen, sizeof(gScreen));
    /* I/O register is accessed using DMA operation, so cache wait is not needed */
    // DC_WaitWriteBufferEmpty();
    GX_LoadBG0Scr(gScreen, 0, sizeof(gScreen));

    // Variable initialization
    gPictureFrame = 0;

    // Interrupt settings
    OS_SetIrqFunction(OS_IE_V_BLANK, VBlankIntr);
    (void)OS_EnableIrqMask(OS_IE_V_BLANK);
    (void)GX_VBlankIntr(TRUE);
    (void)OS_EnableIrq();
    (void)OS_EnableInterrupts();

    // Initialize memory allocation system
    InitializeAllocateSystem();

    //********************************
    // Initialize wireless
    if (!WH_Initialize())
    {
        OS_Panic("WH_Initialize failed.");
    }
    WH_SetGgid(DEFAULT_GGID);
    //********************************

    // LCD display start
    GX_DispOn();
    GXS_DispOn();

    // Debug string output
    OS_Printf("ARM9: WM data sharing demo started.\n");

    // Empty call for getting key input data (strategy for pressing A Button in the IPL)
    KeyRead(&gKey);

    // Main loop
    GameFrame();                       // Never return
}

/*---------------------------------------------------------------------------*
  Name:         GameFrame

  Description:  Main loop for game frame

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void GameFrame(void)
{
    for (gGameFrame = 0; TRUE; gGameFrame++)
    {
        // Get key input data
        KeyRead(&gKey);

        // Distributes processes based on communication status
        switch (WH_GetSystemState())
        {
        case WH_SYSSTATE_IDLE:
            ModeSelect();
            break;
        case WH_SYSSTATE_ERROR:
        case WH_SYSSTATE_CONNECT_FAIL:
            WH_Reset();
            break;
        case WH_SYSSTATE_FATAL:
            ModeError();
            break;
        case WH_SYSSTATE_BUSY:
        case WH_SYSSTATE_SCANNING:
            ModeWorking();
            break;
        case WH_SYSSTATE_CONNECTED:
        case WH_SYSSTATE_DATASHARING:
            switch (WH_GetConnectMode())
            {
            case WH_CONNECTMODE_DS_PARENT:
                ModeParent();
                break;
            case WH_CONNECTMODE_DS_CHILD:
                ModeChild();
                break;
            }
            break;
        }

        // Wait for completion of multiple cycles of picture frames
        while (TRUE)
        {
            // Wait for V-Blank
            OS_WaitVBlankIntr();
            if (!(gPictureFrame % PICTURE_FRAME_PER_GAME_FRAME))
            {
                break;
            }
        }
    }
}

/*---------------------------------------------------------------------------*
  Name:         ModeSelect

  Description:  Process in parent/child selection screen.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ModeSelect(void)
{
    // Clear the screen
    ClearString();
    // Character display
    PrintString(3, 10, 0xf, "Push A to connect as PARENT");
    PrintString(3, 12, 0xf, "Push B to connect as CHILD");

    if (gKey.trg & PAD_BUTTON_A)
    {
        //********************************
        // Start parent communication
        (void)WH_ParentConnect(WH_CONNECTMODE_DS_PARENT, 0x0000, DEFAULT_CHAN);
        //********************************
    }
    else if (gKey.trg & PAD_BUTTON_B)
    {
        static const u8 ANY_PARENT[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
        //********************************
        // Start child connection
        (void)WH_ChildConnectAuto(WH_CONNECTMODE_DS_CHILD, ANY_PARENT, DEFAULT_CHAN);
        //********************************
    }
}

/*---------------------------------------------------------------------------*
  Name:         ModeError

  Description:  Processing in error display screen.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ModeError(void)
{
    // Clear the screen
    ClearString();
    // Character display
    PrintString(5, 10, 0x1, "======= ERROR! =======");
    PrintString(5, 13, 0xf, " Fatal error occured.");
    PrintString(5, 14, 0xf, "Please reboot program.");
}

/*---------------------------------------------------------------------------*
  Name:         ModeWorking

  Description:  Processing in busy screen

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ModeWorking(void)
{
    // Clear the screen
    ClearString();
    // Character display
    PrintString(9, 11, 0xf, "Now working...");

    if (gKey.trg & PAD_BUTTON_START)
    {
        //********************************
        // End communication
        WH_Finalize();
        //********************************
    }
}

/*---------------------------------------------------------------------------*
  Name:         ModeParent

  Description:  Processing in parent communications screen.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ModeParent(void)
{
    BOOL    result;

    // Edit send data
    gSendBuf[0] = (u16)(gPictureFrame >> 16);
    gSendBuf[1] = (u16)(gPictureFrame & 0xffff);
    gSendBuf[2] = (u16)(gGameFrame >> 16);
    gSendBuf[3] = (u16)(gGameFrame & 0xffff);

    //********************************
    // Synchronize data sharing
    result = WH_StepDS((void *)gSendBuf);
    //********************************

    // Clear the screen
    ClearString();
    // Character display
    PrintString(8, 1, 0x2, "Parent mode");
    // Display shared data
    if (result)
    {
        PrintSharedData(WH_GetBitmap());
    }
    else
    {
        // Also try StepDataSharing in the next frame
        gPictureFrame--;
    }

    if (gKey.trg & PAD_BUTTON_START)
    {
        //********************************
        // End communication
        WH_Finalize();
        //********************************
    }
}

/*---------------------------------------------------------------------------*
  Name:         ModeChild

  Description:  Processing in child communications screen.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ModeChild(void)
{
    BOOL    result;

    // Edit send data
    gSendBuf[0] = (u16)(gPictureFrame >> 16);
    gSendBuf[1] = (u16)(gPictureFrame & 0xffff);
    gSendBuf[2] = (u16)(gGameFrame >> 16);
    gSendBuf[3] = (u16)(gGameFrame & 0xffff);

    //********************************
    // Synchronize data sharing
    result = WH_StepDS((void *)gSendBuf);
    //********************************

    // Clear the screen
    ClearString();
    // Character display
    PrintString(8, 1, 0x2, "Child mode");
    // Display shared data
    if (result)
    {
        PrintSharedData(WH_GetBitmapDS());
    }
    else
    {
        // Also try StepDataSharing in the next frame
        gPictureFrame--;
    }

    if (gKey.trg & PAD_BUTTON_START)
    {
        //********************************
        // End communication
        WH_Finalize();
        //********************************
    }
}

/*---------------------------------------------------------------------------*
  Name:         VBlankIntr

  Description:  V-Blank interrupt vector.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void VBlankIntr(void)
{
    // Increment picture frame counter
    gPictureFrame++;

    // Repeat rendering to match game frame
    if (!(gPictureFrame % PICTURE_FRAME_PER_GAME_FRAME))
    {
        // Reflect virtual screen in VRAM
        DC_FlushRange(gScreen, sizeof(gScreen));
        /* I/O register is accessed using DMA operation, so cache wait is not needed */
        // DC_WaitWriteBufferEmpty();
        GX_LoadBG0Scr(gScreen, 0, sizeof(gScreen));
    }

    // Sets the IRQ check flag
    OS_SetIrqCheckFlag(OS_IE_V_BLANK);
}

/*---------------------------------------------------------------------------*
  Name:         PrintSharedData

  Description:  Displays data from each shared terminal.

  Arguments:    bitmap: ID bitmap indicating the terminal receiving data

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void PrintSharedData(u16 bitmap)
{
    u16     i;
    //u8     *p;
    u16    *p;
    u16     temp[SHARED_DATA_SIZE / sizeof(u16)];

    // Loop for maximum number of parent devices + child devices
    for (i = 0; i < (1 + WM_NUM_MAX_CHILD); i++)
    {
        if (bitmap & (0x0001 << i))
        {
            //********************************
            // Get data from terminal with ID of 'i'
            p = WH_GetSharedDataAdr(i);
            //********************************

            if (p != NULL)
            {
                // Copy once to ensure alignment
                MI_CpuCopy8(p, temp, SHARED_DATA_SIZE);
                PrintString(2, (s16)(3 + i), 0x4,
                            "%04x%04x-%04x%04x", temp[0], temp[1], temp[2], temp[3]);
            }
            else
            {
                PrintString(2, (s16)(3 + i), 0x1, "xxxxxxxx-xxxxxxxx");
            }
        }
    }
    // Change the color only for data for this device
    ColorString(2, (s16)(3 + WH_GetCurrentAid()), 17, 0xf);
}

/*---------------------------------------------------------------------------*
  Name:         KeyRead

  Description:  Edits key input data.
                Detects press trigger, release trigger, and press-and-hold repeat.

  Arguments:    pKey: Structure that holds key input data to be edited

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void KeyRead(KeyInfo * pKey)
{
    static u16 repeat_count[12];
    int     i;
    u16     r;

    r = PAD_Read();
    pKey->trg = 0x0000;
    pKey->up = 0x0000;
    pKey->rep = 0x0000;

    for (i = 0; i < 12; i++)
    {
        if (r & (0x0001 << i))
        {
            if (!(pKey->cnt & (0x0001 << i)))
            {
                pKey->trg |= (0x0001 << i);     // Press trigger
                repeat_count[i] = 1;
            }
            else
            {
                if (repeat_count[i] > KEY_REPEAT_START)
                {
                    pKey->rep |= (0x0001 << i); // Press-and-hold repeat
                    repeat_count[i] = KEY_REPEAT_START - KEY_REPEAT_SPAN;
                }
                else
                {
                    repeat_count[i]++;
                }
            }
        }
        else
        {
            if (pKey->cnt & (0x0001 << i))
            {
                pKey->up |= (0x0001 << i);      // Release trigger
            }
        }
    }
    pKey->cnt = r;                     // Unprocessed key input
}

/*---------------------------------------------------------------------------*
  Name:         ClearString

  Description:  Clears the virtual screen.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ClearString(void)
{
    MI_CpuClearFast((void *)gScreen, sizeof(gScreen));
}

/*---------------------------------------------------------------------------*
  Name:         PrintString

  Description:  Positions the text string on the virtual screen. The string can be up to 32 chars.

  Arguments:    x: X-coordinate where character string starts (x 8 dots)
                y: Y-coordinate where character string starts (x 8 dots)
                palette: Specify text color by palette number
                text: Text string to position. Null-terminated.
                ...: Virtual argument.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void PrintString(s16 x, s16 y, u8 palette, char *text, ...)
{
    va_list vlist;
    char    temp[32 + 2];
    s32     i;

    va_start(vlist, text);
    (void)vsnprintf(temp, 33, text, vlist);
    va_end(vlist);

    *(u16 *)(&temp[32]) = 0x0000;
    for (i = 0;; i++)
    {
        if (temp[i] == 0x00)
        {
            break;
        }
        gScreen[((y * 32) + x + i) % (32 * 32)] = (u16)((palette << 12) | temp[i]);
    }
}

/*---------------------------------------------------------------------------*
  Name:         ColorString

  Description:  Changes the color of character strings printed on the virtual screen.

  Arguments:    x: X-coordinate (x 8 dots ) from which to start color change
                y: Y-coordinate (x 8 dots ) from which to start color change
                length: Number of characters to continue the color change for
                palette: Specify text color by palette number

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void ColorString(s16 x, s16 y, s16 length, u8 palette)
{
    s32     i;
    u16     temp;
    s32     index;

    if (length < 0)
        return;

    for (i = 0; i < length; i++)
    {
        index = ((y * 32) + x + i) % (32 * 32);
        temp = gScreen[index];
        temp &= 0x0fff;
        temp |= (palette << 12);
        gScreen[index] = temp;
    }
}

/*---------------------------------------------------------------------------*
  Name:         InitializeAllocateSystem

  Description:  Initializes the memory allocation system within the main memory arena.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void InitializeAllocateSystem(void)
{
    void   *tempLo;
    OSHeapHandle hh;

    // Based on the premise that OS_Init has been already called
    tempLo = OS_InitAlloc(OS_ARENA_MAIN, OS_GetMainArenaLo(), OS_GetMainArenaHi(), 1);
    OS_SetArenaLo(OS_ARENA_MAIN, tempLo);
    hh = OS_CreateHeap(OS_ARENA_MAIN, OS_GetMainArenaLo(), OS_GetMainArenaHi());
    if (hh < 0)
    {
        OS_Panic("ARM9: Fail to create heap...\n");
    }
    hh = OS_SetCurrentHeap(OS_ARENA_MAIN, hh);
}

/*---------------------------------------------------------------------------*
  End of file
 *---------------------------------------------------------------------------*/