88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
/**
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******************************************************************************
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* @file usb_mem.c
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* @author MCD Application Team
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* @version V4.0.0
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* @date 28-August-2012
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* @brief Utility functions for memory transfers to/from PMA
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT 2012 STMicroelectronics</center></h2>
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*
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* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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* You may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.st.com/software_license_agreement_liberty_v2
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "usb_lib.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Extern variables ----------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/*******************************************************************************
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* Function Name : UserToPMABufferCopy
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* Description : Copy a buffer from user memory area to packet memory area (PMA)
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* Input : - pbUsrBuf: pointer to user memory area.
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* - wPMABufAddr: address into PMA.
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* - wNBytes: no. of bytes to be copied.
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* Output : None.
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* Return : None .
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*******************************************************************************/
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void UserToPMABufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
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{
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uint32_t n = (wNBytes + 1) >> 1; /* n = (wNBytes + 1) / 2 */
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uint32_t i, temp1, temp2;
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uint16_t *pdwVal;
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pdwVal = (uint16_t *)(wPMABufAddr * 2 + PMAAddr);
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for (i = n; i != 0; i--)
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{
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temp1 = (uint16_t) * pbUsrBuf;
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pbUsrBuf++;
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temp2 = temp1 | (uint16_t) * pbUsrBuf << 8;
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*pdwVal++ = temp2;
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pdwVal++;
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pbUsrBuf++;
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}
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}
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/*******************************************************************************
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* Function Name : PMAToUserBufferCopy
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* Description : Copy a buffer from user memory area to packet memory area (PMA)
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* Input : - pbUsrBuf = pointer to user memory area.
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* - wPMABufAddr = address into PMA.
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* - wNBytes = no. of bytes to be copied.
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* Output : None.
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* Return : None.
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*******************************************************************************/
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void PMAToUserBufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
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{
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uint32_t n = (wNBytes + 1) >> 1;/* /2*/
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uint32_t i;
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uint32_t *pdwVal;
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pdwVal = (uint32_t *)(wPMABufAddr * 2 + PMAAddr);
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for (i = n; i != 0; i--)
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{
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*(uint16_t*)pbUsrBuf++ = *pdwVal++;
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pbUsrBuf++;
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}
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}
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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