111 lines
3.7 KiB
Plaintext
111 lines
3.7 KiB
Plaintext
/*
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* @brief LPC17xx/40xx Cyclic Redundancy Check (CRC) Engine driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licenser disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "chip.h"
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#if defined(CHIP_LPC177X_8X) || defined(CHIP_LPC40XX)
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Sets up the CRC engine with defaults based on the polynomial to be used */
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void Chip_CRC_UseDefaultConfig(CRC_POLY_T poly)
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{
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switch (poly) {
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case CRC_POLY_CRC16:
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LPC_CRC->MODE = MODE_CFG_CRC16;
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LPC_CRC->SEED = CRC_SEED_CRC16;
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break;
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case CRC_POLY_CRC32:
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LPC_CRC->MODE = MODE_CFG_CRC32;
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LPC_CRC->SEED = CRC_SEED_CRC32;
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break;
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case CRC_POLY_CCITT:
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default:
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LPC_CRC->MODE = MODE_CFG_CCITT;
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LPC_CRC->SEED = CRC_SEED_CCITT;
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break;
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}
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}
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/* configure CRC engine and compute CCITT checksum from 8-bit data */
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uint32_t Chip_CRC_CRC8(const uint8_t *data, uint32_t bytes)
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{
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Chip_CRC_UseDefaultConfig(CRC_POLY_CCITT);
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while (bytes > 0) {
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Chip_CRC_Write8(*data);
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data++;
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bytes--;
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}
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return Chip_CRC_Sum();
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}
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/* Convenience function for computing a standard CRC16 checksum from 16-bit data block */
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uint32_t Chip_CRC_CRC16(const uint16_t *data, uint32_t hwords)
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{
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Chip_CRC_UseDefaultConfig(CRC_POLY_CRC16);
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while (hwords > 0) {
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Chip_CRC_Write16(*data);
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data++;
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hwords--;
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}
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return Chip_CRC_Sum();
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}
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/* Convenience function for computing a standard CRC32 checksum from 32-bit data block */
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uint32_t Chip_CRC_CRC32(const uint32_t *data, uint32_t words)
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{
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Chip_CRC_UseDefaultConfig(CRC_POLY_CRC32);
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while (words > 0) {
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Chip_CRC_Write32(*data);
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data++;
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words--;
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}
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return Chip_CRC_Sum();
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}
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#endif /* defined(CHIP_LPC177X_8X) || defined(CHIP_LPC40XX) */
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