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/*
* Copyright © 2015 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_crc.h>
#ifndef AO_CRC_WIDTH
#error "Must define AO_CRC_WIDTH"
#endif
/* Only the STM32F07x and ST32F09x series have
* programmable CRC units. Others can only do the ANSI CRC-32 computation
*/
#if !AO_HAVE_PROGRAMMABLE_CRC_UNIT && AO_CRC_WIDTH != 32
#error "Target hardware does not have programmable CRC unit"
#endif
#ifndef AO_CRC_POLY
#if AO_CRC_WIDTH == 16
#define AO_CRC_POLY AO_CRC_16_DEFAULT
#endif
#if AO_CRC_WIDTH == 32
#define AO_CRC_POLY AO_CRC_32_DEFAULT
#endif
#endif
#if !AO_HAVE_PROGRAMMABLE_CRC_UNIT && (AO_CRC_WIDTH != 32 || AO_CRC_POLY != AO_CRC_32_ANSI)
#error "Target hardware does not have programmable CRC unit"
#endif
#if AO_CRC_WIDTH == 32
#define AO_CRC_CR_POLYSIZE STM_CRC_CR_POLYSIZE_32
#endif
#if AO_CRC_WIDTH == 16
#define AO_CRC_CR_POLYSIZE STM_CRC_CR_POLYSIZE_16
#endif
#if AO_CRC_WIDTH == 8
#define AO_CRC_CR_POLYSIZE STM_CRC_CR_POLYSIZE_8
#endif
#if AO_CRC_WIDTH == 7
#define AO_CRC_CR_POLYSIZE STM_CRC_CR_POLYSIZE_7
#endif
#ifndef AO_CRC_INIT
#define AO_CRC_INIT 0xffffffff
#endif
void
ao_crc_reset(void)
{
stm_crc.cr |= (1 << STM_CRC_CR_RESET);
while ((stm_crc.cr & (1 << STM_CRC_CR_RESET)) != 0)
;
}
void
ao_crc_init(void)
{
/* Turn on the CRC clock */
stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_CRCEN);
/* Need to initialize CR even on non-programmable hardware,
* the write to the POLYSIZE bits will be ignored in that
* case
*/
stm_crc.cr = (AO_CRC_CR_POLYSIZE << STM_CRC_CR_POLYSIZE);
stm_crc.init = AO_CRC_INIT;
#if AO_HAVE_PROGRAMMABLE_CRC_UNIT
stm_crc.pol = AO_CRC_POLY;
#endif
ao_crc_reset();
}
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