Mouse code for the MacroRat
mbed-dev/targets/TARGET_NUVOTON/TARGET_M451/device/StdDriver/m451_crc.c
- Committer:
- sahilmgandhi
- Date:
- 2017-06-03
- Revision:
- 46:b156ef445742
- Parent:
- 18:6a4db94011d3
File content as of revision 46:b156ef445742:
/**************************************************************************//** * @file crc.c * @version V3.00 * $Revision: 7 $ * $Date: 15/08/11 10:26a $ * @brief M451 series CRC driver source file * * @note * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved. *****************************************************************************/ #include "M451Series.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->SEED = u32Seed; CRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCEN_Msk; /* Setting CRCRST bit will reload the initial seed value(CRC_SEED register) to CRC controller */ CRC->CTL |= CRC_CTL_CRCRST_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) { switch(CRC->CTL & CRC_CTL_CRCMODE_Msk) { case CRC_CCITT: case CRC_16: return (CRC->CHECKSUM & 0xFFFF); case CRC_32: return (CRC->CHECKSUM); case CRC_8: return (CRC->CHECKSUM & 0xFF); default: return 0; } } /*@}*/ /* end of group CRC_EXPORTED_FUNCTIONS */ /*@}*/ /* end of group CRC_Driver */ /*@}*/ /* end of group Standard_Driver */ /*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/