neorv32/sw/lib/source/neorv32_crc.c

117 lines
5.6 KiB
C

// #################################################################################################
// # << NEORV32: neorv32_crc.c - Cyclic Redundancy Check Unit (CRC) HW Driver >> #
// # ********************************************************************************************* #
// # BSD 3-Clause License #
// # #
// # Copyright (c) 2023, Stephan Nolting. All rights reserved. #
// # #
// # Redistribution and use in source and binary forms, with or without modification, are #
// # permitted provided that the following conditions are met: #
// # #
// # 1. Redistributions of source code must retain the above copyright notice, this list of #
// # conditions and the following disclaimer. #
// # #
// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
// # conditions and the following disclaimer in the documentation and/or other materials #
// # provided with the distribution. #
// # #
// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
// # endorse or promote products derived from this software without specific prior written #
// # permission. #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
// #################################################################################################
/**********************************************************************//**
* @file neorv32_crc.c
* @brief Cyclic redundancy check unit (CRC) HW driver source file.
*
* @note These functions should only be used if the CRC unit was synthesized (IO_CRC_EN = true).
**************************************************************************/
#include "neorv32.h"
#include "neorv32_crc.h"
/**********************************************************************//**
* Check if CRC unit was synthesized.
*
* @return 0 if CRC was not synthesized, 1 if CRC is available.
**************************************************************************/
int neorv32_crc_available(void) {
if (NEORV32_SYSINFO->SOC & (1 << SYSINFO_SOC_IO_CRC)) {
return 1;
}
else {
return 0;
}
}
/**********************************************************************//**
* Setup CRC unit.
*
* @param[in] mode Operation mode (#NEORV32_CRC_MODE_enum).
* @param[in] poly CRC polynomial.
* @param[in] start CRC shift register start value.
**************************************************************************/
void neorv32_crc_setup(uint32_t mode, uint32_t poly, uint32_t start) {
NEORV32_CRC->MODE = mode;
NEORV32_CRC->POLY = poly;
NEORV32_CRC->SREG = start;
}
/**********************************************************************//**
* Compute pre-configured CRC for entire data block.
*
* @param[in] byte Pointer to byte (uint8_t) source data array.
* @param[in] length Length of source data array.
* @return 32-bit CRC result.
**************************************************************************/
uint32_t neorv32_crc_block(uint8_t *byte, int length) {
int i;
for (i=0; i<length; i++) {
NEORV32_CRC->DATA = (uint32_t)byte[i];
}
return NEORV32_CRC->SREG;
}
/**********************************************************************//**
* Compute pre-configured CRC for single data byte.
*
* @param[in] byte Data byte (uint8_t).
**************************************************************************/
void neorv32_crc_single(uint8_t byte) {
NEORV32_CRC->DATA = (uint32_t)byte;
}
/**********************************************************************//**
* Get current CRC shift register data.
*
* @return 32-bit CRC result.
**************************************************************************/
uint32_t neorv32_crc_get(void) {
return NEORV32_CRC->SREG;
}