83 lines
4.9 KiB
C
83 lines
4.9 KiB
C
// #################################################################################################
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// # << NEORV32: neorv32_crc.h - Cyclic Redundancy Check Unit (CRC) HW Driver >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2023, 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 NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file neorv32_crc.h
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* @brief Cyclic redundancy check unit (CRC) HW driver header file.
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*
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* @note These functions should only be used if the CRC unit was synthesized (IO_CRC_EN = true).
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**************************************************************************/
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#ifndef neorv32_crc_h
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#define neorv32_crc_h
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/**********************************************************************//**
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* @name IO Device: Cyclic Redundancy Check Unit (CRC)
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**************************************************************************/
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/**@{*/
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/** CRC module prototype */
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typedef volatile struct __attribute__((packed,aligned(4))) {
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uint32_t MODE; /**< offset 0: mode register (#NEORV32_CRC_MODE_enum) */
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uint32_t POLY; /**< offset 4: polynomial register */
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uint32_t DATA; /**< offset 8: data input register */
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uint32_t SREG; /**< offset 12: CRC shift register */
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} neorv32_crc_t;
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/** CRC module hardware access (#neorv32_crc_t) */
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#define NEORV32_CRC ((neorv32_crc_t*) (NEORV32_CRC_BASE))
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/** CRC mode select */
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enum NEORV32_CRC_MODE_enum {
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CRC_MODE8 = 0b00, /**< (0) crc8 */
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CRC_MODE16 = 0b01, /**< (1) crc16 */
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CRC_MODE32 = 0b10, /**< (3) crc32 */
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};
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/**@}*/
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/**********************************************************************//**
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* @name Prototypes
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**************************************************************************/
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/**@{*/
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int neorv32_crc_available(void);
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void neorv32_crc_setup(uint32_t mode, uint32_t poly, uint32_t start);
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uint32_t neorv32_crc_block(uint8_t *byte, int length);
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void neorv32_crc_single(uint8_t byte);
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uint32_t neorv32_crc_get(void);
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/**@}*/
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#endif // neorv32_crc_h
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