57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* mcu-stm32f103.c - STM32F103 specific routines
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*
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* Copyright (C) 2017
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* Free Software Initiative of Japan
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* Author: NIIBE Yutaka <gniibe@fsij.org>
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*
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* This file is a part of Gnuk, a GnuPG USB Token implementation.
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*
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* Gnuk is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Gnuk is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdint.h>
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#include "mcu/stm32f103.h"
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static uint32_t
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rbit (uint32_t v)
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{
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uint32_t r;
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asm ("rbit %0, %1" : "=r" (r) : "r" (v));
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return r;
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}
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int
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check_crc32 (const uint32_t *start_p, const uint32_t *end_p)
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{
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uint32_t crc32 = *end_p;
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const uint32_t *p;
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RCC->AHBENR |= RCC_AHBENR_CRCEN;
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CRC->CR = CRC_CR_RESET;
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for (p = start_p; p < end_p; p++)
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CRC->DR = rbit (*p);
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return (rbit (CRC->DR) ^ crc32) == 0xffffffff;
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}
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uint8_t *
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sram_address (uint32_t offset)
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{
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return ((uint8_t *)0x20000000) + offset;
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}
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