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// #################################################################################################
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// # < neo430_crc.c - CRC module helper functions > #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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#include "neo430.h"
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#include "neo430_crc.h"
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/* ------------------------------------------------------------
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* INFO Compute CRC16 from buffer
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* PARAM start_val: Start value for CRC shift register
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* PARAM polynomial: 16-bit polynomial XOR mask
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* PARAM data: Pointer to BYTE input data array
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* PARAM length: Number of elements in input data array
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* RETURN CRC16 result
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* ------------------------------------------------------------ */
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uint16_t neo430_crc16(uint16_t start_val, uint16_t polynomial, uint8_t *data, uint16_t length) {
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CRC_POLY_LO = polynomial;
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CRC_RESX = start_val;
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while(length) {
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CRC_CRC16IN = (uint16_t)(*data++); // no wait required here
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length--;
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}
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return CRC_RESX;
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}
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/* ------------------------------------------------------------
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* INFO Compute CRC32 from buffer
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* PARAM start_val: Start value for CRC shift register
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* PARAM polynomial: 32-bit polynomial XOR mask
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* PARAM data: Pointer to BYTE input data array
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* PARAM length: Number of elements in input data array
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* RETURN CRC32 result
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* ------------------------------------------------------------ */
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uint32_t neo430_crc32(uint32_t start_val, uint32_t polynomial, uint8_t *data, uint16_t length) {
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CRC_POLY32bit = polynomial;
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CRC_R32bit = start_val;
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while(length) {
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CRC_CRC32IN = (uint16_t)(*data++); // no wait required here
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length--;
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}
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return CRC_R32bit;
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}
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/* ------------------------------------------------------------
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* INFO Initialize start value for CRC16
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* PARAM 16-bit CRC shift reg start value
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* ------------------------------------------------------------ */
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void neo430_crc16_set_start_value(uint16_t start_val) {
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CRC_RESX = start_val;
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}
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/* ------------------------------------------------------------
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* INFO Initialize start value for CRC32
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* PARAM 32-bit CRC shift reg start value
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* ------------------------------------------------------------ */
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void neo430_crc32_set_start_value(uint32_t start_val) {
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CRC_R32bit = start_val;
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}
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/* ------------------------------------------------------------
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* INFO Set polynomial mask for CRC16
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* PARAM 16-bit CRC16 polynomial XOR mask
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* ------------------------------------------------------------ */
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void neo430_crc16_set_polynomial(uint16_t poly) {
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CRC_POLY_LO = poly;
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}
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/* ------------------------------------------------------------
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* INFO Set polynomial mask for CRC32
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* PARAM 32-bit CRC16 polynomial XOR mask
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* ------------------------------------------------------------ */
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void neo430_crc32_set_polynomial(uint32_t poly) {
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CRC_POLY32bit = poly;
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}
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/* ------------------------------------------------------------
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* INFO Compute CRC16 for one new data byte
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* PARAM 8-bit data input
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* RETURN Current result of CRC16 shift reg
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* ------------------------------------------------------------ */
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uint16_t neo430_crc16_iterate(uint8_t data) {
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CRC_CRC16IN = (uint16_t)data;
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asm volatile ("nop");
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return CRC_RESX;
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}
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/* ------------------------------------------------------------
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* INFO Compute CRC32 for one new data byte
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* PARAM 8-bit data input
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* RETURN Current result of CRC32 shift reg
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* ------------------------------------------------------------ */
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uint32_t neo430_crc32_iterate(uint8_t data) {
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CRC_CRC32IN = (uint16_t)data;
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asm volatile ("nop");
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return CRC_R32bit;
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}
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