| /**************************************************************************//** | |
| * @file crc.c | |
| * @version V3.00 | |
| * @brief Cyclic Redundancy Check(CRC) driver source file | |
| * | |
| * @copyright (C) 2016 Nuvoton Technology Corp. All rights reserved. | |
| *****************************************************************************/ | |
| #include "NuMicro.h" | |
| /** @addtogroup Standard_Driver Standard Driver | |
| @{ | |
| */ | |
| /** @addtogroup CRC_Driver CRC Driver | |
| @{ | |
| */ | |
| /** @addtogroup CRC_EXPORTED_FUNCTIONS CRC Exported Functions | |
| @{ | |
| */ | |
| /** | |
| * @brief CRC Open | |
| * | |
| * @param[in] u32Mode CRC operation polynomial mode. Valid values are: | |
| * - \ref CRC_CCITT | |
| * - \ref CRC_8 | |
| * - \ref CRC_16 | |
| * - \ref CRC_32 | |
| * @param[in] u32Attribute CRC operation data attribute. Valid values are combined with: | |
| * - \ref CRC_CHECKSUM_COM | |
| * - \ref CRC_CHECKSUM_RVS | |
| * - \ref CRC_WDATA_COM | |
| * - \ref CRC_WDATA_RVS | |
| * @param[in] u32Seed Seed value. | |
| * @param[in] u32DataLen CPU Write Data Length. Valid values are: | |
| * - \ref CRC_CPU_WDATA_8 | |
| * - \ref CRC_CPU_WDATA_16 | |
| * - \ref CRC_CPU_WDATA_32 | |
| * | |
| * @return None | |
| * | |
| * @details This function will enable the CRC controller by specify CRC operation mode, attribute, initial seed and write data length. \n | |
| * After that, user can start to perform CRC calculate by calling CRC_WRITE_DATA macro or CRC_DAT register directly. | |
| */ | |
| void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen) | |
| { | |
| CRC_T *pCRC; | |
| if((__PC()&NS_OFFSET) == NS_OFFSET) | |
| { | |
| pCRC = CRC_NS; | |
| } | |
| else | |
| { | |
| pCRC = CRC; | |
| } | |
| pCRC->SEED = u32Seed; | |
| pCRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCEN_Msk; | |
| /* Setting CHKSINIT bit will reload the initial seed value(CRC_SEED register) to CRC controller */ | |
| pCRC->CTL |= CRC_CTL_CHKSINIT_Msk; | |
| } | |
| /** | |
| * @brief Get CRC Checksum | |
| * | |
| * @param[in] None | |
| * | |
| * @return Checksum Result | |
| * | |
| * @details This macro gets the CRC checksum result by current CRC polynomial mode. | |
| */ | |
| uint32_t CRC_GetChecksum(void) | |
| { | |
| CRC_T *pCRC; | |
| uint32_t u32Checksum = 0UL; | |
| if((__PC()&NS_OFFSET) == NS_OFFSET) | |
| { | |
| pCRC = CRC_NS; | |
| } | |
| else | |
| { | |
| pCRC = CRC; | |
| } | |
| switch(pCRC->CTL & CRC_CTL_CRCMODE_Msk) | |
| { | |
| case CRC_CCITT: | |
| case CRC_16: | |
| u32Checksum = (pCRC->CHECKSUM & 0xFFFFUL); | |
| break; | |
| case CRC_32: | |
| u32Checksum = pCRC->CHECKSUM; | |
| break; | |
| case CRC_8: | |
| u32Checksum = (pCRC->CHECKSUM & 0xFFUL); | |
| break; | |
| default: | |
| break; | |
| } | |
| return u32Checksum; | |
| } | |
| /*@}*/ /* end of group CRC_EXPORTED_FUNCTIONS */ | |
| /*@}*/ /* end of group CRC_Driver */ | |
| /*@}*/ /* end of group Standard_Driver */ | |
| /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/ |