/** * * \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 Atmel Support */ #include #include #include /** * \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; }