Diff: targets/TARGET_STM/TARGET_STM32L0/device/stm32l0xx_hal_crc_ex.c

Revision:

149:156823d33999

Parent:

144:ef7eb2e8f9f7

Child:

151:5eaa88a5bcc7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32L0/device/stm32l0xx_hal_crc_ex.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,231 @@
+/**
+  ******************************************************************************
+  * @file    stm32l0xx_hal_crc_ex.c
+  * @author  MCD Application Team
+  * @version V1.5.0
+  * @date    8-January-2016
+  * @brief   Extended CRC HAL module driver.
+  *    
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the CRC peripheral:
+  *           + Initialization/de-initialization functions
+  *         
+  @verbatim
+  ==============================================================================
+                    ##### CRC specific features #####
+  ==============================================================================
+  [..] 
+  (#) Polynomial configuration.
+  (#) Input data reverse mode.
+  (#) Output data reverse mode.
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************  
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32l0xx_hal.h"
+
+/** @addtogroup STM32L0xx_HAL_Driver
+  * @{
+  */
+
+/** @addtogroup CRCEx
+  * @brief CRC Extended HAL module driver
+  * @{
+  */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @addtogroup CRCEx_Exported_Functions
+  * @{
+  */
+
+/** @addtogroup CRCEx_Exported_Functions_Group1
+ *  @brief    Extended CRC features functions
+ *
+@verbatim   
+ ===============================================================================
+            ##### CRC Extended features functions #####
+ ===============================================================================  
+    [..]
+This subsection provides function allowing to:
+      (+) Set CRC polynomial if different from default one.
+ 
+@endverbatim
+  * @{
+  */
+
+
+/**
+  * @brief  Initializes the CRC polynomial if different from default one.
+  * @param  hcrc: CRC handle
+  * @param  Pol: CRC generating polynomial (7, 8, 16 or 32-bit long)
+  *         This parameter is written in normal representation, e.g.
+  *         for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65 
+  *         for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021     
+  * @param  PolyLength: CRC polynomial length 
+  *         This parameter can be one of the following values:
+  *          @arg CRC_POLYLENGTH_7B: 7-bit long CRC (generating polynomial of degree 7)
+  *          @arg CRC_POLYLENGTH_8B: 8-bit long CRC (generating polynomial of degree 8)
+  *          @arg CRC_POLYLENGTH_16B: 16-bit long CRC (generating polynomial of degree 16)
+  *          @arg CRC_POLYLENGTH_32B: 32-bit long CRC (generating polynomial of degree 32)                
+  * @retval HAL status
+  */                                   
+HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength)
+{
+  uint32_t msb = 31; /* polynomial degree is 32 at most, so msb is initialized to max value */
+
+  /* Check the parameters */
+  assert_param(IS_CRC_POL_LENGTH(PolyLength));
+  
+  /* check polynomial definition vs polynomial size:
+   * polynomial length must be aligned with polynomial
+   * definition. HAL_ERROR is reported if Pol degree is 
+   * larger than that indicated by PolyLength.
+   * Look for MSB position: msb will contain the degree of
+   *  the second to the largest polynomial member. E.g., for
+   *  X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */
+  while (((Pol & ((uint32_t)(0x1) << msb)) == 0) && (msb-- > 0));
+
+  switch (PolyLength)
+  {
+    case CRC_POLYLENGTH_7B:
+      if (msb >= HAL_CRC_LENGTH_7B) return  HAL_ERROR;
+      break;
+    case CRC_POLYLENGTH_8B:
+      if (msb >= HAL_CRC_LENGTH_8B) return  HAL_ERROR;
+      break;
+    case CRC_POLYLENGTH_16B:
+      if (msb >= HAL_CRC_LENGTH_16B) return  HAL_ERROR;
+      break;
+    case CRC_POLYLENGTH_32B:
+      /* no polynomial definition vs. polynomial length issue possible */
+      break;
+  default:
+      break;
+  }
+
+  /* set generating polynomial */
+  WRITE_REG(hcrc->Instance->POL, Pol);
+  
+  /* set generating polynomial size */
+  MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength);  
+  
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Set the Reverse Input data mode.
+  * @param  hcrc: CRC handle
+  * @param  InputReverseMode: Input Data inversion mode
+  *         This parameter can be one of the following values:
+  *          @arg CRC_INPUTDATA_INVERSION_NONE: no change in bit order (default value)
+  *          @arg CRC_INPUTDATA_INVERSION_BYTE: Byte-wise bit reversal
+  *          @arg CRC_INPUTDATA_INVERSION_HALFWORD: HalfWord-wise bit reversal
+  *          @arg CRC_INPUTDATA_INVERSION_WORD: Word-wise bit reversal              
+  * @retval HAL status
+  */                                   
+HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode)
+{  
+  /* Check the parameters */
+  assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode));
+  
+  /* Change CRC peripheral state */
+  hcrc->State = HAL_CRC_STATE_BUSY;
+
+  /* set input data inversion mode */
+  MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode);    
+  /* Change CRC peripheral state */
+  hcrc->State = HAL_CRC_STATE_READY;
+  
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Set the Reverse Output data mode.
+  * @param  hcrc: CRC handle
+  * @param  OutputReverseMode: Output Data inversion mode
+  *         This parameter can be one of the following values:
+  *          @arg CRC_OUTPUTDATA_INVERSION_DISABLE: no CRC inversion (default value)
+  *          @arg CRC_OUTPUTDATA_INVERSION_ENABLE: bit-level inversion (e.g for a 8-bit CRC: 0xB5 becomes 0xAD)
+  * @retval HAL status
+  */                                   
+HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode)
+{
+  /* Check the parameters */
+  assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode));
+  
+  /* Change CRC peripheral state */
+  hcrc->State = HAL_CRC_STATE_BUSY;
+
+  /* set output data inversion mode */
+  MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode); 
+      
+  /* Change CRC peripheral state */
+  hcrc->State = HAL_CRC_STATE_READY;
+  
+  /* Return function status */
+  return HAL_OK;
+}
+
+
+
+
+/**
+  * @}
+  */
+
+
+/**
+  * @}
+  */
+
+
+#endif /* HAL_CRC_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+