1 /**************************************************************************//**
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4 * @brief Cyclic Redundancy Check(CRC) driver source file
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6 * @copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
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7 *****************************************************************************/
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11 /** @addtogroup Standard_Driver Standard Driver
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15 /** @addtogroup CRC_Driver CRC Driver
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19 /** @addtogroup CRC_EXPORTED_FUNCTIONS CRC Exported Functions
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26 * @param[in] u32Mode CRC operation polynomial mode. Valid values are:
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31 * @param[in] u32Attribute CRC operation data attribute. Valid values are combined with:
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32 * - \ref CRC_CHECKSUM_COM
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33 * - \ref CRC_CHECKSUM_RVS
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34 * - \ref CRC_WDATA_COM
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35 * - \ref CRC_WDATA_RVS
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36 * @param[in] u32Seed Seed value.
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37 * @param[in] u32DataLen CPU Write Data Length. Valid values are:
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38 * - \ref CRC_CPU_WDATA_8
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39 * - \ref CRC_CPU_WDATA_16
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40 * - \ref CRC_CPU_WDATA_32
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44 * @details This function will enable the CRC controller by specify CRC operation mode, attribute, initial seed and write data length. \n
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45 * After that, user can start to perform CRC calculate by calling CRC_WRITE_DATA macro or CRC_DAT register directly.
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47 void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen)
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51 if((__PC()&NS_OFFSET) == NS_OFFSET)
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60 pCRC->SEED = u32Seed;
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61 pCRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCEN_Msk;
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63 /* Setting CHKSINIT bit will reload the initial seed value(CRC_SEED register) to CRC controller */
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64 pCRC->CTL |= CRC_CTL_CHKSINIT_Msk;
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68 * @brief Get CRC Checksum
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72 * @return Checksum Result
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74 * @details This macro gets the CRC checksum result by current CRC polynomial mode.
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76 uint32_t CRC_GetChecksum(void)
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79 uint32_t u32Checksum = 0UL;
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81 if((__PC()&NS_OFFSET) == NS_OFFSET)
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90 switch(pCRC->CTL & CRC_CTL_CRCMODE_Msk)
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94 u32Checksum = (pCRC->CHECKSUM & 0xFFFFUL);
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98 u32Checksum = pCRC->CHECKSUM;
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102 u32Checksum = (pCRC->CHECKSUM & 0xFFUL);
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109 return u32Checksum;
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112 /*@}*/ /* end of group CRC_EXPORTED_FUNCTIONS */
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114 /*@}*/ /* end of group CRC_Driver */
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116 /*@}*/ /* end of group Standard_Driver */
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118 /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
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