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/**
*
* \file
*
* \brief SAM DSU CRC32 driver.
*
* This file defines a useful set of functions for DSU CRC32 on SAM devices.
*
* Copyright (c) 2016-2017 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include <system_interrupt.h>
#include <pac.h>
#include <crc32.h>
/**
* \brief Calculate CRC32 value of the input memory
*
* Calculate CRC32 value of the input memory.
*
* The read value must be complemented to match standard CRC32 implementations
* or kept non-inverted if used as starting point for subsequent CRC32 calculations.
*
* \param[in] addr Memory address to calculate CRC32
* \param[in] len Memory length to calculate CRC32
* \param[in,out] pcrc32 Initial value used for the CRC32 calculation, and CRC32 result after calculation
*
* \return Status of the configuration procedure.
*
* \retval STATUS_OK If CRC32 calculation OK
* \retval STATUS_ERR_BAD_ADDRESS The address was not aligned with 4 bytes.
* \retval STATUS_ERR_IO A bus error is detected
*/
enum status_code dsu_crc32_cal(const uint32_t addr, const uint32_t len, uint32_t *pcrc32)
{
if (addr & 0x00000003) {
return STATUS_ERR_BAD_ADDRESS;
}
system_interrupt_disable_global();
system_peripheral_unlock(SYSTEM_PERIPHERAL_ID(DSU), ~SYSTEM_PERIPHERAL_ID(DSU));
DSU->DATA.reg = *pcrc32;
DSU->ADDR.reg = addr;
DSU->LENGTH.reg = len;
DSU->CTRL.bit.CRC = 1;
while ((DSU->STATUSA.reg & DSU_STATUSA_DONE) != 1) {
}
if (DSU->STATUSA.reg & DSU_STATUSA_BERR) {
system_peripheral_lock(SYSTEM_PERIPHERAL_ID(DSU), ~SYSTEM_PERIPHERAL_ID(DSU));
system_interrupt_enable_global();
return STATUS_ERR_IO;
}
*pcrc32 = DSU->DATA.reg;
DSU->STATUSA.reg = DSU_STATUSA_DONE;
system_peripheral_lock(SYSTEM_PERIPHERAL_ID(DSU), ~SYSTEM_PERIPHERAL_ID(DSU));
system_interrupt_enable_global();
return STATUS_OK;
}
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