154 lines
4.3 KiB
C
154 lines
4.3 KiB
C
/** @defgroup flash_file FLASH peripheral API
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*
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* @ingroup peripheral_apis
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*
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* @brief <b>libopencm3 GD32F1x0 FLASH</b>
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*
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* @version 1.0.0
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*
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* @author @htmlonly © @endhtmlonly 2013
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* Frantisek Burian <BuFran@seznam.cz>
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*
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* @date 14 January 2014
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*
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* FLASH memory may be used for data storage as well as code, and may be
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* programmatically modified. Note that for firmware upload the GD32F1x0
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* provides a built-in bootloader in system memory that can be entered from a
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* running program.
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*
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* FLASH must first be unlocked before programming. In this module a write to
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* FLASH is a blocking operation until the end-of-operation flag is asserted.
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*
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* @note: don't forget to lock it again when all operations are complete.
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*
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* LGPL License Terms @ref lgpl_license
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2013 Frantisek Burian <BuFran@seznam.cz>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/gd32/flash.h>
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/*---------------------------------------------------------------------------*/
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/** @brief Clear All Status Flags
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Program error, end of operation, write protect error, busy.
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*/
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void flash_clear_status_flags(void)
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{
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flash_clear_pgerr_flag();
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flash_clear_eop_flag();
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flash_clear_wrprterr_flag();
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Read All Status Flags
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The programming error, end of operation, write protect error and busy flags
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are returned in the order of appearance in the status register.
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@returns uint32_t. bit 0: busy, bit 2: programming error, bit 4: write protect
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error, bit 5: end of operation.
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*/
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uint32_t flash_get_status_flags(void)
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{
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return FLASH_SR & (FLASH_SR_PGERR |
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FLASH_SR_EOP |
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FLASH_SR_WRPRTERR |
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FLASH_SR_BSY);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Program a Half Word to FLASH
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This performs all operations necessary to program a 16 bit word to FLASH memory.
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The program error flag should be checked separately for the event that memory
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was not properly erased.
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Status bit polling is used to detect end of operation.
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@param[in] address Full address of flash half word to be programmed.
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@param[in] data half word to write
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*/
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void flash_program_half_word(uint32_t address, uint16_t data)
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{
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flash_wait_for_last_operation();
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FLASH_CR |= FLASH_CR_PG;
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MMIO16(address) = data;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_PG;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Erase a Page of FLASH
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This performs all operations necessary to erase a page in FLASH memory.
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The page should be checked to ensure that it was properly erased. A page must
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first be fully erased before attempting to program it.
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Note that the page sizes differ between devices. See the reference manual or
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the FLASH programming manual for details.
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@param[in] page_address Full address of flash page to be erased.
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*/
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void flash_erase_page(uint32_t page_address)
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{
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flash_wait_for_last_operation();
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FLASH_CR |= FLASH_CR_PER;
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FLASH_AR = page_address;
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FLASH_CR |= FLASH_CR_STRT;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_PER;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Erase All FLASH
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This performs all operations necessary to erase all user pages in the FLASH
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memory. The information block is unaffected.
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*/
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void flash_erase_all_pages(void)
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{
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flash_wait_for_last_operation();
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FLASH_CR |= FLASH_CR_MER; /* Enable mass erase. */
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FLASH_CR |= FLASH_CR_STRT; /* Trigger the erase. */
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_MER; /* Disable mass erase. */
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}
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/**@}*/
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