tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L0/stm32l0xx_hal_crc_ex.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32l0xx_hal_crc_ex.c
   4   * @author  MCD Application Team
   5   * @version V1.2.0
   6   * @date    06-February-2015
   7   * @brief   Extended CRC HAL module driver.
   8   *
   9   *          This file provides firmware functions to manage the following
  10   *          functionalities of the CRC peripheral:
  11   *           + Initialization/de-initialization functions
  12   *
  13   @verbatim
  14   ==============================================================================
  15                     ##### CRC specific features #####
  16   ==============================================================================
  17   [..]
  18   (#) Polynomial configuration.
  19   (#) Input data reverse mode.
  20   (#) Output data reverse mode.
  21
  22   @endverbatim
  23   ******************************************************************************
  24   * @attention
  25   *
  26   * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  27   *
  28   * Redistribution and use in source and binary forms, with or without modification,
  29   * are permitted provided that the following conditions are met:
  30   *   1. Redistributions of source code must retain the above copyright notice,
  31   *      this list of conditions and the following disclaimer.
  32   *   2. Redistributions in binary form must reproduce the above copyright notice,
  33   *      this list of conditions and the following disclaimer in the documentation
  34   *      and/or other materials provided with the distribution.
  35   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  36   *      may be used to endorse or promote products derived from this software
  37   *      without specific prior written permission.
  38   *
  39   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  40   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  42   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  43   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  44   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  45   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  46   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  47   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  48   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  49   *
  50   ******************************************************************************
  51   */
  52
  53 /* Includes ------------------------------------------------------------------*/
  54 #include "stm32l0xx_hal.h"
  55
  56 /** @addtogroup STM32L0xx_HAL_Driver
  57   * @{
  58   */
  59
  60 /** @addtogroup CRCEx
  61   * @brief CRC Extended HAL module driver
  62   * @{
  63   */
  64
  65 #ifdef HAL_CRC_MODULE_ENABLED
  66
  67 /* Private typedef -----------------------------------------------------------*/
  68 /* Private define ------------------------------------------------------------*/
  69 /* Private macro -------------------------------------------------------------*/
  70 /* Private variables ---------------------------------------------------------*/
  71 /* Private function prototypes -----------------------------------------------*/
  72 /* Private functions ---------------------------------------------------------*/
  73
  74 /** @addtogroup CRCEx_Exported_Functions
  75   * @{
  76   */
  77
  78 /** @addtogroup CRCEx_Exported_Functions_Group1
  79  *  @brief    Extended CRC features functions
  80  *
  81 @verbatim
  82  ===============================================================================
  83             ##### CRC Extended features functions #####
  84  ===============================================================================
  85     [..]
  86 This subsection provides function allowing to:
  87       (+) Set CRC polynomial if different from default one.
  88
  89 @endverbatim
  90   * @{
  91   */
  92
  93
  94 /**
  95   * @brief  Initializes the CRC polynomial if different from default one.
  96   * @param  hcrc: CRC handle
  97   * @param  Pol: CRC generating polynomial (7, 8, 16 or 32-bit long)
  98   *         This parameter is written in normal representation, e.g.
  99   *         for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65
 100   *         for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021
 101   * @param  PolyLength: CRC polynomial length
 102   *         This parameter can be one of the following values:
 103   *          @arg CRC_POLYLENGTH_7B: 7-bit long CRC (generating polynomial of degree 7)
 104   *          @arg CRC_POLYLENGTH_8B: 8-bit long CRC (generating polynomial of degree 8)
 105   *          @arg CRC_POLYLENGTH_16B: 16-bit long CRC (generating polynomial of degree 16)
 106   *          @arg CRC_POLYLENGTH_32B: 32-bit long CRC (generating polynomial of degree 32)
 107   * @retval HAL status
 108   */
 109 HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength)
 110 {
 111   uint32_t msb = 31; /* polynomial degree is 32 at most, so msb is initialized to max value */
 112
 113   /* Check the parameters */
 114   assert_param(IS_CRC_POL_LENGTH(PolyLength));
 115
 116   /* check polynomial definition vs polynomial size:
 117    * polynomial length must be aligned with polynomial
 118    * definition. HAL_ERROR is reported if Pol degree is
 119    * larger than that indicated by PolyLength.
 120    * Look for MSB position: msb will contain the degree of
 121    *  the second to the largest polynomial member. E.g., for
 122    *  X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */
 123   while (((Pol & ((uint32_t)(0x1) << msb)) == 0) && (msb-- > 0));
 124
 125   switch (PolyLength)
 126   {
 127     case CRC_POLYLENGTH_7B:
 128       if (msb >= HAL_CRC_LENGTH_7B) return  HAL_ERROR;
 129       break;
 130     case CRC_POLYLENGTH_8B:
 131       if (msb >= HAL_CRC_LENGTH_8B) return  HAL_ERROR;
 132       break;
 133     case CRC_POLYLENGTH_16B:
 134       if (msb >= HAL_CRC_LENGTH_16B) return  HAL_ERROR;
 135       break;
 136     case CRC_POLYLENGTH_32B:
 137       /* no polynomial definition vs. polynomial length issue possible */
 138       break;
 139   default:
 140       break;
 141   }
 142
 143   /* set generating polynomial */
 144   WRITE_REG(hcrc->Instance->POL, Pol);
 145
 146   /* set generating polynomial size */
 147   MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength);
 148
 149   /* Return function status */
 150   return HAL_OK;
 151 }
 152
 153 /**
 154   * @brief  Set the Reverse Input data mode.
 155   * @param  hcrc: CRC handle
 156   * @param  InputReverseMode: Input Data inversion mode
 157   *         This parameter can be one of the following values:
 158   *          @arg CRC_INPUTDATA_INVERSION_NONE: no change in bit order (default value)
 159   *          @arg CRC_INPUTDATA_INVERSION_BYTE: Byte-wise bit reversal
 160   *          @arg CRC_INPUTDATA_INVERSION_HALFWORD: HalfWord-wise bit reversal
 161   *          @arg CRC_INPUTDATA_INVERSION_WORD: Word-wise bit reversal
 162   * @retval HAL status
 163   */
 164 HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode)
 165 {
 166   /* Check the parameters */
 167   assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode));
 168
 169   /* Change CRC peripheral state */
 170   hcrc->State = HAL_CRC_STATE_BUSY;
 171
 172   /* set input data inversion mode */
 173   MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode);
 174   /* Change CRC peripheral state */
 175   hcrc->State = HAL_CRC_STATE_READY;
 176
 177   /* Return function status */
 178   return HAL_OK;
 179 }
 180
 181 /**
 182   * @brief  Set the Reverse Output data mode.
 183   * @param  hcrc: CRC handle
 184   * @param  OutputReverseMode: Output Data inversion mode
 185   *         This parameter can be one of the following values:
 186   *          @arg CRC_OUTPUTDATA_INVERSION_DISABLE: no CRC inversion (default value)
 187   *          @arg CRC_OUTPUTDATA_INVERSION_ENABLE: bit-level inversion (e.g for a 8-bit CRC: 0xB5 becomes 0xAD)
 188   * @retval HAL status
 189   */
 190 HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode)
 191 {
 192   /* Check the parameters */
 193   assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode));
 194
 195   /* Change CRC peripheral state */
 196   hcrc->State = HAL_CRC_STATE_BUSY;
 197
 198   /* set output data inversion mode */
 199   MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode);
 200
 201   /* Change CRC peripheral state */
 202   hcrc->State = HAL_CRC_STATE_READY;
 203
 204   /* Return function status */
 205   return HAL_OK;
 206 }
 207
 208
 209
 210
 211 /**
 212   * @}
 213   */
 214
 215
 216 /**
 217   * @}
 218   */
 219
 220
 221 #endif /* HAL_CRC_MODULE_ENABLED */
 222 /**
 223   * @}
 224   */
 225
 226 /**
 227   * @}
 228   */
 229
 230 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 231