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STM32 F4 FLASH: Enable/disable the flash write protection on any sector. I have verified it to work on the stm32f427.

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Sebastien Lorquet 2017-06-16 08:46:34 -06:00 committed by Gregory Nutt
parent 64e3dc5e8b
commit 4d9be9bc20
2 changed files with 87 additions and 0 deletions
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4
arch/arm/src/stm32/chip/stm32_flash.h
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@ -466,4 +466,8 @@
void stm32_flash_lock(void);
void stm32_flash_unlock(void);
#ifdef CONFIG_STM32_STM32F40XX
int stm32_flash_writeprotect(size_t page, bool enabled);
#endif
#endif /* __ARCH_ARM_SRC_STM32_CHIP_STM32_FLASH_H */

83
arch/arm/src/stm32/stm32_flash.c
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@ -79,6 +79,8 @@
#else
# define FLASH_KEY1 0x45670123
# define FLASH_KEY2 0xCDEF89AB
# define FLASH_OPTKEY1 0x08192A3B
# define FLASH_OPTKEY2 0x4C5D6E7F
#endif
#if defined(CONFIG_STM32_STM32F10XX) || defined(CONFIG_STM32_STM32F30XX)
@ -384,6 +386,87 @@ ssize_t stm32_eeprom_erase(size_t addr, size_t eraselen)
#endif /* defined(CONFIG_STM32_STM32L15XX) */
/************************************************************************************
* Name: stm32_flash_writeprotect
*
* Description:
* Enable or disable the write protection of a flash sector.
*
************************************************************************************/
#ifdef CONFIG_STM32_STM32F40XX
int stm32_flash_writeprotect(size_t page, bool enabled)
{
uint32_t reg;
uint32_t val;
#ifdef CONFIG_STM32_STM32F40XX
if (page >= STM32_FLASH_NPAGES)
{
return -EFAULT;
}
#else
# warning missing logic in stm32_flash_writeprotect
#endif
/* Select the register that contains the bit to be changed */
if (page < 12)
{
reg = STM32_FLASH_OPTCR;
}
#if defined(CONFIG_STM32_FLASH_CONFIG_I) && defined(CONFIG_STM32_STM32F40XX)
else
{
reg = STM32_FLASH_OPTCR1;
page -= 12;
}
#else
else
{
return -EFAULT;
}
#endif
/* Read the option status */
val = getreg32(reg);
/* Set or clear the protection */
if (enabled)
{
val &= ~(1 << (16+page) );
}
else
{
val |= (1 << (16+page) );
}
/* Unlock options */
putreg32(FLASH_OPTKEY1, STM32_FLASH_OPTKEYR);
putreg32(FLASH_OPTKEY2, STM32_FLASH_OPTKEYR);
/* Write options */
putreg32(val, reg);
/* Trigger programmation */
modifyreg32(STM32_FLASH_OPTCR, 0, FLASH_OPTCR_OPTSTRT);
/* Wait for completion */
while(getreg32(STM32_FLASH_SR) & FLASH_SR_BSY) up_waste();
/* Relock options */
modifyreg32(STM32_FLASH_OPTCR, 0, FLASH_OPTCR_OPTLOCK);
return 0;
}
#endif
#if defined(CONFIG_STM32_STM32F10XX) || defined(CONFIG_STM32_STM32F30XX)
size_t up_progmem_pagesize(size_t page)
{