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Add more support functions for flash handling.

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Thanks to Mark Butler <mbutler@physics.otago.ac.nz>.
This commit is contained in:
Uwe Hermann
2010-10-18 00:20:59 +02:00
parent 6ba179b361
commit 0287fd9029
2 changed files with 161 additions and 0 deletions
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139
lib/flash.c
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@@ -2,6 +2,7 @@
* This file is part of the libopenstm32 project.
*
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
* Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -48,3 +49,141 @@ void flash_set_ws(u32 ws)
reg32 |= ws;
FLASH_ACR = reg32;
}
void flash_unlock(void)
{
/* Authorize the FPEC access. */
FLASH_KEYR = FLASH_KEY1;
FLASH_KEYR = FLASH_KEY2;
}
void flash_lock(void)
{
FLASH_CR |= FLASH_LOCK;
}
void flash_clear_pgerr_flag(void)
{
FLASH_SR |= FLASH_PGERR;
}
void flash_clear_eop_flag(void)
{
FLASH_SR |= FLASH_EOP;
}
void flash_clear_wrprterr_flag(void)
{
FLASH_SR |= FLASH_WRPRTERR;
}
void flash_clear_bsy_flag(void)
{
FLASH_SR &= ~FLASH_BSY;
}
void flash_clear_status_flags(void)
{
flash_clear_pgerr_flag();
flash_clear_eop_flag();
flash_clear_wrprterr_flag();
flash_clear_bsy_flag();
}
void flash_unlock_option_bytes(void)
{
FLASH_OPTKEYR = FLASH_KEY1;
FLASH_OPTKEYR = FLASH_KEY2;
}
void flash_wait_for_last_operation(void)
{
while ((FLASH_SR & FLASH_BSY) == FLASH_BSY)
;
}
void flash_program_word(u32 address, u32 data)
{
/* Ensure that all flash operations are complete. */
flash_wait_for_last_operation();
/* Enable writes to flash. */
FLASH_CR |= FLASH_PG;
/* Program the first half of the word. */
(*(volatile u16 *)address) = (u16)data;
/* Wait for the write to complete. */
flash_wait_for_last_operation();
/* Program the second half of the word. */
(*(volatile u16 *)(address + 2)) = data >> 16;
/* Wait for the write to complete. */
flash_wait_for_last_operation();
/* Disable writes to flash. */
FLASH_CR &= ~FLASH_PG;
}
void flash_program_half_word(u32 address, u16 data)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_PG;
(*(volatile u16 *)address) = data;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_PG; /* Disable the PG bit. */
}
void flash_erase_page(u32 page_address)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_PER;
FLASH_AR = page_address;
FLASH_CR |= FLASH_STRT;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_PER;
}
void flash_erase_all_pages(void)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_MER; /* Enable mass erase. */
FLASH_CR |= FLASH_STRT; /* Trigger the erase. */
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_MER; /* Disable mass erase. */
}
void flash_erase_option_bytes(void)
{
flash_wait_for_last_operation();
if ((FLASH_CR & FLASH_OPTWRE) == 0)
flash_unlock_option_bytes();
FLASH_CR |= FLASH_OPTER; /* Enable option byte erase. */
FLASH_CR |= FLASH_STRT;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_OPTER; /* Disable option byte erase. */
}
void flash_program_option_bytes(u32 address, u16 data)
{
flash_wait_for_last_operation();
if ((FLASH_CR & FLASH_OPTWRE) == 0)
flash_unlock_option_bytes();
FLASH_CR |= FLASH_OPTPG; /* Enable option byte programming. */
(*(volatile u16 *)address) = data;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_OPTPG; /* Disable option byte programming. */
}