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82 lines
2.1 KiB
82 lines
2.1 KiB
/** @addtogroup crc_file CRC peripheral API
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@ingroup peripheral_apis
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@author @htmlonly © @endhtmlonly 2012 Karl Palsson <karlp@remake.is>
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Karl Palsson <karlp@remake.is>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/crc.h>
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/**@{*/
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/*---------------------------------------------------------------------------*/
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/** @brief CRC Reset.
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Reset the CRC unit and forces the data register to all 1s.
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*/
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void crc_reset(void)
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{
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CRC_CR |= CRC_CR_RESET;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief CRC Calculate.
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Writes a data word to the register, the write operation stalling until the
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computation is complete.
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@param[in] data Unsigned int32.
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@returns int32 Computed CRC result
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*/
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uint32_t crc_calculate(uint32_t data)
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{
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CRC_DR = data;
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/* Data sheet says this blocks until it's ready.... */
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return CRC_DR;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief CRC Calculate of a Block of Data.
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Writes data words consecutively to the register, the write operation stalling
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until the computation of each word is complete.
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@param[in] datap Unsigned int32. pointer to an array of 32 bit data words.
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@param[in] size int. Size of the array.
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@returns int32 Final computed CRC result
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*/
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uint32_t crc_calculate_block(uint32_t *datap, int size)
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{
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int i;
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for (i = 0; i < size; i++) {
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CRC_DR = datap[i];
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}
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return CRC_DR;
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}
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/**@}*/
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