190 lines
3.9 KiB
C
190 lines
3.9 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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* Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
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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 <stm32/flash.h>
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void flash_prefetch_buffer_enable(void)
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{
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FLASH_ACR |= FLASH_PRFTBE;
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}
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void flash_prefetch_buffer_disable(void)
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{
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FLASH_ACR &= ~FLASH_PRFTBE;
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}
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void flash_halfcycle_enable(void)
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{
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FLASH_ACR |= FLASH_HLFCYA;
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}
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void flash_halfcycle_disable(void)
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{
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FLASH_ACR &= ~FLASH_HLFCYA;
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}
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void flash_set_ws(u32 ws)
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{
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u32 reg32;
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reg32 = FLASH_ACR;
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reg32 &= ~((1 << 0) | (1 << 1) | (1 << 2));
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reg32 |= ws;
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FLASH_ACR = reg32;
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}
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void flash_unlock(void)
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{
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/* Authorize the FPEC access. */
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FLASH_KEYR = FLASH_KEY1;
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FLASH_KEYR = FLASH_KEY2;
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}
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void flash_lock(void)
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{
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FLASH_CR |= FLASH_LOCK;
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}
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void flash_clear_pgerr_flag(void)
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{
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FLASH_SR |= FLASH_PGERR;
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}
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void flash_clear_eop_flag(void)
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{
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FLASH_SR |= FLASH_EOP;
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}
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void flash_clear_wrprterr_flag(void)
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{
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FLASH_SR |= FLASH_WRPRTERR;
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}
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void flash_clear_bsy_flag(void)
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{
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FLASH_SR &= ~FLASH_BSY;
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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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flash_clear_bsy_flag();
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}
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void flash_unlock_option_bytes(void)
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{
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FLASH_OPTKEYR = FLASH_KEY1;
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FLASH_OPTKEYR = FLASH_KEY2;
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}
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void flash_wait_for_last_operation(void)
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{
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while ((FLASH_SR & FLASH_BSY) == FLASH_BSY)
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;
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}
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void flash_program_word(u32 address, u32 data)
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{
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/* Ensure that all flash operations are complete. */
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flash_wait_for_last_operation();
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/* Enable writes to flash. */
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FLASH_CR |= FLASH_PG;
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/* Program the first half of the word. */
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(*(volatile u16 *)address) = (u16)data;
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/* Wait for the write to complete. */
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flash_wait_for_last_operation();
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/* Program the second half of the word. */
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(*(volatile u16 *)(address + 2)) = data >> 16;
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/* Wait for the write to complete. */
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flash_wait_for_last_operation();
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/* Disable writes to flash. */
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FLASH_CR &= ~FLASH_PG;
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}
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void flash_program_half_word(u32 address, u16 data)
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{
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flash_wait_for_last_operation();
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FLASH_CR |= FLASH_PG;
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(*(volatile u16 *)address) = data;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_PG; /* Disable the PG bit. */
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}
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void flash_erase_page(u32 page_address)
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{
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flash_wait_for_last_operation();
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FLASH_CR |= FLASH_PER;
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FLASH_AR = page_address;
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FLASH_CR |= FLASH_STRT;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_PER;
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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_MER; /* Enable mass erase. */
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FLASH_CR |= FLASH_STRT; /* Trigger the erase. */
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_MER; /* Disable mass erase. */
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}
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void flash_erase_option_bytes(void)
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{
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flash_wait_for_last_operation();
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if ((FLASH_CR & FLASH_OPTWRE) == 0)
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flash_unlock_option_bytes();
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FLASH_CR |= FLASH_OPTER; /* Enable option byte erase. */
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FLASH_CR |= FLASH_STRT;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_OPTER; /* Disable option byte erase. */
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}
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void flash_program_option_bytes(u32 address, u16 data)
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{
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flash_wait_for_last_operation();
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if ((FLASH_CR & FLASH_OPTWRE) == 0)
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flash_unlock_option_bytes();
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FLASH_CR |= FLASH_OPTPG; /* Enable option byte programming. */
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(*(volatile u16 *)address) = data;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_OPTPG; /* Disable option byte programming. */
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}
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