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| bfc108 | 1 | /** |
| Q | 2 | ****************************************************************************** |
| 3 | * @file stm32f0xx_ll_crc.c | |
| 4 | * @author MCD Application Team | |
| 5 | * @brief CRC LL module driver. | |
| 6 | ****************************************************************************** | |
| 7 | * @attention | |
| 8 | * | |
| 9 | * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2> | |
| 10 | * | |
| 11 | * Redistribution and use in source and binary forms, with or without modification, | |
| 12 | * are permitted provided that the following conditions are met: | |
| 13 | * 1. Redistributions of source code must retain the above copyright notice, | |
| 14 | * this list of conditions and the following disclaimer. | |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 16 | * this list of conditions and the following disclaimer in the documentation | |
| 17 | * and/or other materials provided with the distribution. | |
| 18 | * 3. Neither the name of STMicroelectronics nor the names of its contributors | |
| 19 | * may be used to endorse or promote products derived from this software | |
| 20 | * without specific prior written permission. | |
| 21 | * | |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 23 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 25 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 28 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 29 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 32 | * | |
| 33 | ****************************************************************************** | |
| 34 | */ | |
| 35 | #if defined(USE_FULL_LL_DRIVER) | |
| 36 | ||
| 37 | /* Includes ------------------------------------------------------------------*/ | |
| 38 | #include "stm32f0xx_ll_crc.h" | |
| 39 | ||
| 40 | #ifdef USE_FULL_ASSERT | |
| 41 | #include "stm32_assert.h" | |
| 42 | #else | |
| 43 | #define assert_param(expr) ((void)0U) | |
| 44 | #endif | |
| 45 | ||
| 46 | /** @addtogroup STM32F0xx_LL_Driver | |
| 47 | * @{ | |
| 48 | */ | |
| 49 | ||
| 50 | #if defined (CRC) | |
| 51 | ||
| 52 | /** @addtogroup CRC_LL | |
| 53 | * @{ | |
| 54 | */ | |
| 55 | ||
| 56 | /* Private types -------------------------------------------------------------*/ | |
| 57 | /* Private variables ---------------------------------------------------------*/ | |
| 58 | /* Private constants ---------------------------------------------------------*/ | |
| 59 | /* Private macros ------------------------------------------------------------*/ | |
| 60 | /* Private function prototypes -----------------------------------------------*/ | |
| 61 | ||
| 62 | /* Exported functions --------------------------------------------------------*/ | |
| 63 | /** @addtogroup CRC_LL_Exported_Functions | |
| 64 | * @{ | |
| 65 | */ | |
| 66 | ||
| 67 | /** @addtogroup CRC_LL_EF_Init | |
| 68 | * @{ | |
| 69 | */ | |
| 70 | ||
| 71 | /** | |
| 72 | * @brief De-initialize CRC registers (Registers restored to their default values). | |
| 73 | * @param CRCx CRC Instance | |
| 74 | * @retval An ErrorStatus enumeration value: | |
| 75 | * - SUCCESS: CRC registers are de-initialized | |
| 76 | * - ERROR: CRC registers are not de-initialized | |
| 77 | */ | |
| 78 | ErrorStatus LL_CRC_DeInit(CRC_TypeDef *CRCx) | |
| 79 | { | |
| 80 | ErrorStatus status = SUCCESS; | |
| 81 | ||
| 82 | /* Check the parameters */ | |
| 83 | assert_param(IS_CRC_ALL_INSTANCE(CRCx)); | |
| 84 | ||
| 85 | if (CRCx == CRC) | |
| 86 | { | |
| 87 | #if defined(CRC_PROG_POLYNOMIAL_SUPPORT) | |
| 88 | /* Set programmable polynomial size in CR register to reset value (32 bits)*/ | |
| 89 | LL_CRC_SetPolynomialSize(CRCx, LL_CRC_POLYLENGTH_32B); | |
| 90 | ||
| 91 | /* Set programmable polynomial in POL register to reset value */ | |
| 92 | LL_CRC_SetPolynomialCoef(CRCx, LL_CRC_DEFAULT_CRC32_POLY); | |
| 93 | #endif | |
| 94 | ||
| 95 | /* Set INIT register to reset value */ | |
| 96 | LL_CRC_SetInitialData(CRCx, LL_CRC_DEFAULT_CRC_INITVALUE); | |
| 97 | ||
| 98 | /* Set Reversibility options on I/O data values in CR register to reset value */ | |
| 99 | LL_CRC_SetInputDataReverseMode(CRCx, LL_CRC_INDATA_REVERSE_NONE); | |
| 100 | LL_CRC_SetOutputDataReverseMode(CRCx, LL_CRC_OUTDATA_REVERSE_NONE); | |
| 101 | ||
| 102 | /* Reset the CRC calculation unit */ | |
| 103 | LL_CRC_ResetCRCCalculationUnit(CRCx); | |
| 104 | ||
| 105 | /* Reset IDR register */ | |
| 106 | LL_CRC_Write_IDR(CRCx, 0x00U); | |
| 107 | } | |
| 108 | else | |
| 109 | { | |
| 110 | status = ERROR; | |
| 111 | } | |
| 112 | ||
| 113 | return (status); | |
| 114 | } | |
| 115 | ||
| 116 | /** | |
| 117 | * @} | |
| 118 | */ | |
| 119 | ||
| 120 | /** | |
| 121 | * @} | |
| 122 | */ | |
| 123 | ||
| 124 | /** | |
| 125 | * @} | |
| 126 | */ | |
| 127 | ||
| 128 | #endif /* defined (CRC) */ | |
| 129 | ||
| 130 | /** | |
| 131 | * @} | |
| 132 | */ | |
| 133 | ||
| 134 | #endif /* USE_FULL_LL_DRIVER */ | |
| 135 | ||
| 136 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ | |
| 137 | ||
