Fawwaz Nadzmy / mbed-STM

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NUVOTON/TARGET_M451/device/StdDriver/m451_crc.c@149:156823d33999, 2016-10-28 (annotated)

Committer:
<>
Date:
Fri Oct 28 11:17:30 2016 +0100
Revision:
149:156823d33999
This updates the lib to the mbed lib v128



NOTE: This release includes a restructuring of the file and directory locations and thus some

include paths in your code may need updating accordingly.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /**************************************************************************//**
<> 149:156823d33999 2 * @file crc.c
<> 149:156823d33999 3 * @version V3.00
<> 149:156823d33999 4 * $Revision: 7 $
<> 149:156823d33999 5 * $Date: 15/08/11 10:26a $
<> 149:156823d33999 6 * @brief M451 series CRC driver source file
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * @note
<> 149:156823d33999 9 * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.
<> 149:156823d33999 10 *****************************************************************************/
<> 149:156823d33999 11 #include "M451Series.h"
<> 149:156823d33999 12
<> 149:156823d33999 13
<> 149:156823d33999 14 /** @addtogroup Standard_Driver Standard Driver
<> 149:156823d33999 15 @{
<> 149:156823d33999 16 */
<> 149:156823d33999 17
<> 149:156823d33999 18 /** @addtogroup CRC_Driver CRC Driver
<> 149:156823d33999 19 @{
<> 149:156823d33999 20 */
<> 149:156823d33999 21
<> 149:156823d33999 22 /** @addtogroup CRC_EXPORTED_FUNCTIONS CRC Exported Functions
<> 149:156823d33999 23 @{
<> 149:156823d33999 24 */
<> 149:156823d33999 25
<> 149:156823d33999 26 /**
<> 149:156823d33999 27 * @brief CRC Open
<> 149:156823d33999 28 *
<> 149:156823d33999 29 * @param[in] u32Mode CRC operation polynomial mode. Valid values are:
<> 149:156823d33999 30 * - \ref CRC_CCITT
<> 149:156823d33999 31 * - \ref CRC_8
<> 149:156823d33999 32 * - \ref CRC_16
<> 149:156823d33999 33 * - \ref CRC_32
<> 149:156823d33999 34 * @param[in] u32Attribute CRC operation data attribute. Valid values are combined with:
<> 149:156823d33999 35 * - \ref CRC_CHECKSUM_COM
<> 149:156823d33999 36 * - \ref CRC_CHECKSUM_RVS
<> 149:156823d33999 37 * - \ref CRC_WDATA_COM
<> 149:156823d33999 38 * - \ref CRC_WDATA_RVS
<> 149:156823d33999 39 * @param[in] u32Seed Seed value.
<> 149:156823d33999 40 * @param[in] u32DataLen CPU Write Data Length. Valid values are:
<> 149:156823d33999 41 * - \ref CRC_CPU_WDATA_8
<> 149:156823d33999 42 * - \ref CRC_CPU_WDATA_16
<> 149:156823d33999 43 * - \ref CRC_CPU_WDATA_32
<> 149:156823d33999 44 *
<> 149:156823d33999 45 * @return None
<> 149:156823d33999 46 *
<> 149:156823d33999 47 * @details This function will enable the CRC controller by specify CRC operation mode, attribute, initial seed and write data length. \n
<> 149:156823d33999 48 * After that, user can start to perform CRC calculate by calling CRC_WRITE_DATA macro or CRC_DAT register directly.
<> 149:156823d33999 49 */
<> 149:156823d33999 50 void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen)
<> 149:156823d33999 51 {
<> 149:156823d33999 52 CRC->SEED = u32Seed;
<> 149:156823d33999 53 CRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCEN_Msk;
<> 149:156823d33999 54
<> 149:156823d33999 55 /* Setting CRCRST bit will reload the initial seed value(CRC_SEED register) to CRC controller */
<> 149:156823d33999 56 CRC->CTL |= CRC_CTL_CRCRST_Msk;
<> 149:156823d33999 57 }
<> 149:156823d33999 58
<> 149:156823d33999 59 /**
<> 149:156823d33999 60 * @brief Get CRC Checksum
<> 149:156823d33999 61 *
<> 149:156823d33999 62 * @param[in] None
<> 149:156823d33999 63 *
<> 149:156823d33999 64 * @return Checksum Result
<> 149:156823d33999 65 *
<> 149:156823d33999 66 * @details This macro gets the CRC checksum result by current CRC polynomial mode.
<> 149:156823d33999 67 */
<> 149:156823d33999 68 uint32_t CRC_GetChecksum(void)
<> 149:156823d33999 69 {
<> 149:156823d33999 70 switch(CRC->CTL & CRC_CTL_CRCMODE_Msk)
<> 149:156823d33999 71 {
<> 149:156823d33999 72 case CRC_CCITT:
<> 149:156823d33999 73 case CRC_16:
<> 149:156823d33999 74 return (CRC->CHECKSUM & 0xFFFF);
<> 149:156823d33999 75
<> 149:156823d33999 76 case CRC_32:
<> 149:156823d33999 77 return (CRC->CHECKSUM);
<> 149:156823d33999 78
<> 149:156823d33999 79 case CRC_8:
<> 149:156823d33999 80 return (CRC->CHECKSUM & 0xFF);
<> 149:156823d33999 81
<> 149:156823d33999 82 default:
<> 149:156823d33999 83 return 0;
<> 149:156823d33999 84 }
<> 149:156823d33999 85 }
<> 149:156823d33999 86
<> 149:156823d33999 87 /*@}*/ /* end of group CRC_EXPORTED_FUNCTIONS */
<> 149:156823d33999 88
<> 149:156823d33999 89 /*@}*/ /* end of group CRC_Driver */
<> 149:156823d33999 90
<> 149:156823d33999 91 /*@}*/ /* end of group Standard_Driver */
<> 149:156823d33999 92
<> 149:156823d33999 93 /*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/