/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies Inc.
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * ****************************************************************************/

/**
 * @file usb_mem.c
 * @author Nations
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */
#include "usb_lib.h"
u8* EpOutDataPtrTmp;
u8* EpInDataPtrTmp;

/**
 * @brief Copy a buffer from user memory area to packet memory area (PMA)
 * @param pbUsrBuf pointer to user memory area.
 * @param wPMABufAddr address into PMA.
 * @param wNBytes no. of bytes to be copied.
 */
void USB_CopyUserToPMABuf(uint8_t* pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
{
    uint32_t n = (wNBytes + 1) >> 1; /* n = (wNBytes + 1) / 2 */
    uint32_t i, temp1, temp2;
    uint16_t* pdwVal;
    pdwVal = (uint16_t*)(wPMABufAddr * 2 + PMAAddr);
    for (i = n; i != 0; i--)
    {
        temp1 = (uint16_t)*pbUsrBuf;
        pbUsrBuf++;
        temp2     = temp1 | (uint16_t)*pbUsrBuf << 8;
        *pdwVal++ = temp2;
        pdwVal++;
        pbUsrBuf++;
        EpInDataPtrTmp = pbUsrBuf;
    }
}

/**
 * @brief Copy a buffer from user memory area to packet memory area (PMA)
 * @param pbUsrBuf    pointer to user memory area.
 * @param wPMABufAddr address into PMA.
 * @param wNBytes     no. of bytes to be copied.
 */
void USB_CopyPMAToUserBuf(uint8_t* pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
{
    uint32_t n = (wNBytes + 1) >> 1; /* /2*/
    uint32_t i;
    uint32_t* pdwVal;
    pdwVal = (uint32_t*)(wPMABufAddr * 2 + PMAAddr);
    for (i = n; i != 0; i--)
    {
        *(uint16_t*)pbUsrBuf++ = *pdwVal++;
        pbUsrBuf++;
        EpOutDataPtrTmp = pbUsrBuf;
    }
}