lib/main/STM32_USB-FS-Device_Driver/src/usb_mem.c

   1 /**
   2   ******************************************************************************
   3   * @file    usb_mem.c
   4   * @author  MCD Application Team
   5   * @version V4.0.0
   6   * @date    28-August-2012
   7   * @brief   Utility functions for memory transfers to/from PMA
   8   ******************************************************************************
   9   * @attention
  10   *
  11   * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  12   *
  13   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  14   * You may not use this file except in compliance with the License.
  15   * You may obtain a copy of the License at:
  16   *
  17   *        http://www.st.com/software_license_agreement_liberty_v2
  18   *
  19   * Unless required by applicable law or agreed to in writing, software
  20   * distributed under the License is distributed on an "AS IS" BASIS,
  21   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22   * See the License for the specific language governing permissions and
  23   * limitations under the License.
  24   *
  25   ******************************************************************************
  26   */
  27
  28 /* Includes ------------------------------------------------------------------*/
  29 #include "usb_lib.h"
  30
  31 /* Private typedef -----------------------------------------------------------*/
  32 /* Private define ------------------------------------------------------------*/
  33 /* Private macro -------------------------------------------------------------*/
  34 /* Private variables ---------------------------------------------------------*/
  35 /* Extern variables ----------------------------------------------------------*/
  36 /* Private function prototypes -----------------------------------------------*/
  37 /* Private functions ---------------------------------------------------------*/
  38
  39 /*******************************************************************************
  40 * Function Name  : UserToPMABufferCopy
  41 * Description    : Copy a buffer from user memory area to packet memory area (PMA)
  42 * Input          : - pbUsrBuf: pointer to user memory area.
  43 *                  - wPMABufAddr: address into PMA.
  44 *                  - wNBytes: no. of bytes to be copied.
  45 * Output         : None.
  46 * Return         : None .
  47 *******************************************************************************/
  48 void UserToPMABufferCopy(const uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
  49 {
  50   uint32_t n = (wNBytes + 1) >> 1;   /* n = (wNBytes + 1) / 2 */
  51   uint32_t i, temp1, temp2;
  52   uint16_t *pdwVal;
  53   pdwVal = (uint16_t *)(wPMABufAddr * 2 + PMAAddr);
  54   for (i = n; i != 0; i--)
  55   {
  56     temp1 = (uint16_t) * pbUsrBuf;
  57     pbUsrBuf++;
  58     temp2 = temp1 | (uint16_t) * pbUsrBuf << 8;
  59     *pdwVal++ = temp2;
  60     pdwVal++;
  61     pbUsrBuf++;
  62   }
  63 }
  64
  65 /*******************************************************************************
  66 * Function Name  : PMAToUserBufferCopy
  67 * Description    : Copy a buffer from user memory area to packet memory area (PMA)
  68 * Input          : - pbUsrBuf    = pointer to user memory area.
  69 *                  - wPMABufAddr = address into PMA.
  70 *                  - wNBytes     = no. of bytes to be copied.
  71 * Output         : None.
  72 * Return         : None.
  73 *******************************************************************************/
  74 void PMAToUserBufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
  75 {
  76   uint32_t n = (wNBytes + 1) >> 1;/* /2*/
  77   uint32_t i;
  78   uint32_t *pdwVal;
  79   pdwVal = (uint32_t *)(wPMABufAddr * 2 + PMAAddr);
  80   for (i = n; i != 0; i--)
  81   {
  82     *(uint16_t*)pbUsrBuf++ = *pdwVal++;
  83     pbUsrBuf++;
  84   }
  85 }
  86
  87 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/