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Diffstat (limited to 'libopencm3/lib/stm32/common/crc_common_all.c')
| -rw-r--r-- | libopencm3/lib/stm32/common/crc_common_all.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/libopencm3/lib/stm32/common/crc_common_all.c b/libopencm3/lib/stm32/common/crc_common_all.c new file mode 100644 index 0000000..5794c8f --- /dev/null +++ b/libopencm3/lib/stm32/common/crc_common_all.c @@ -0,0 +1,81 @@ +/** @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; +} +/**@}*/ + |