kopia lustrzana https://github.com/OpenRTX/OpenRTX
94 wiersze
3.0 KiB
C
94 wiersze
3.0 KiB
C
/***************************************************************************
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* Copyright (C) 2021 - 2025 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it 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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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public 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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#include <stm32f4xx.h>
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#include <stddef.h>
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#include "flash.h"
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/**
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* \internal
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* Utility function performing unlock of flash erase and write access.
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*
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* @true on success, false on failure.
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*/
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static inline bool unlock()
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{
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// Flash already unlocked
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if((FLASH->CR & FLASH_CR_LOCK) == 0)
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{
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return true;
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}
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FLASH->KEYR = 0x45670123;
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FLASH->KEYR = 0xCDEF89AB;
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// Succesful unlock
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if((FLASH->CR & FLASH_CR_LOCK) == 0)
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{
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return true;
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}
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return false;
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}
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bool flash_eraseSector(const uint8_t secNum)
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{
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if(secNum > 11) return false;
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if(unlock() == false) return false;
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// Flash busy, wait until previous operation finishes
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while((FLASH->SR & FLASH_SR_BSY) != 0) ;
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FLASH->CR |= FLASH_CR_SER; // Sector erase
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FLASH->CR &= ~FLASH_CR_SNB;
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FLASH->CR |= (secNum << 3); // Sector number
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FLASH->CR |= FLASH_CR_STRT; // Start erase
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// Wait until erase ends
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while((FLASH->SR & FLASH_SR_BSY) != 0) ;
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FLASH->CR &= ~FLASH_CR_SER;
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return true;
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}
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void flash_write(const uint32_t address, const void *data, const size_t len)
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{
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if(unlock() == false) return;
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if((data == NULL) || (len == 0)) return;
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// Write data to memory, 8 bit at a time
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const uint8_t *buf = ((uint8_t *) data);
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uint8_t *mem = ((uint8_t *) address);
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for(size_t i = 0; i < len; i++)
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{
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while((FLASH->SR & FLASH_SR_BSY) != 0) ;
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FLASH->CR = FLASH_CR_PG;
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*mem = buf[i];
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mem++;
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while((FLASH->SR & FLASH_SR_BSY) != 0) ;
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FLASH->CR &= ~FLASH_CR_PG;
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}
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}
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