/*---------------------------------------------------------------------------*
  Project:  TwlSDK - WXC - demos - wxc-dataShare
  File:     gmain.c

  Copyright 2005-2009 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.

  $Date:: 2007-11-15#$
  $Rev: 2414 $
  $Author: hatamoto_minoru $
 *---------------------------------------------------------------------------*/


#include <nitro.h>

#include "gmain.h"
#include "common.h"
#include "disp.h"
#include "wh.h"



//============================================================================
//  Variable Definitions
//============================================================================

//-----------------------
// For data sharing
//-----------------------
static u8 sSendBuf[256] ATTRIBUTE_ALIGN(32);    // Send buffer (must be 32-byte aligned)
static u8 sRecvBuf[256] ATTRIBUTE_ALIGN(32);    // Receive buffer (must 32-byte aligned)
static BOOL sRecvFlag[1 + WM_NUM_MAX_CHILD];    // Receive flag
static GShareData *sShareDataPtr;

//============================================================================
//  Function Definitions
//============================================================================

/*---------------------------------------------------------------------------*
  Name:         GInitDataShare

  Description:  Initializes settings for data-sharing buffer.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
void GInitDataShare(void)
{
    sShareDataPtr = (GShareData *) sSendBuf;

    DC_FlushRange(sSendBuf, 4);
    DC_WaitWriteBufferEmpty();
}


/*---------------------------------------------------------------------------*
  Name:         GStepDataShare

  Description:  Proceeds to the next data sharing synchronization.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
BOOL GStepDataShare(s32 frame)
{
    sShareDataPtr->count = (u32)frame;

    switch (WH_GetSystemState())
    {
        //------------------------------
        // Data-sharing communication
    case WH_SYSSTATE_DATASHARING:
        {
            u16 i;
            u8 *adr;

            if (!WH_StepDS(sSendBuf))
            {
                // Data-sharing communication failure
                return FALSE;
            }

            for (i = 0; i < 16; ++i)
            {
                adr = (u8 *)WH_GetSharedDataAdr(i);
                if (adr != NULL)
                {
                    MI_CpuCopy8(adr, &(sRecvBuf[i * sizeof(GShareData)]), sizeof(GShareData));
                    sRecvFlag[i] = TRUE;
                }
                else
                {
                    sRecvFlag[i] = FALSE;
                }
            }
        }
        break;
    }
    return TRUE;
}






/*---------------------------------------------------------------------------*
  Name:         GMain

  Description:  Parent-child common main routine.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
void GMain(void)
{

    BgPrintStr(4, 3, 0x4, "Send:     %04x-%04x", sShareDataPtr->key, sShareDataPtr->count);
    BgPutString(4, 5, 0x4, "Receive:");
    {
        s32 i;

        for (i = 0; i < (WM_NUM_MAX_CHILD + 1); i++)
        {
            if (sRecvFlag[i])
            {
                GShareData *sd;
                sd = (GShareData *) (&(sRecvBuf[i * sizeof(GShareData)]));

                BgPrintStr(4, (s16)(6 + i), 0x4,
                           "Player%02d: %04x-%04x", i, sd->key, sd->count & 0xffff);
            }
            else
            {
                BgPutString(4, (s16)(6 + i), 0x7, "No child");
            }
        }
    }
}