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