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arch/arm/src/stm32h7/stm32_flash.c: Lock flash option register

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If the flash option register was locked before modifying it, return
it to the locked state after modify.

Signed-off-by: Jukka Laitinen <jukka.laitinen@intel.com>
This commit is contained in:
Jukka Laitinen
2020-04-17 15:00:06 +03:00
committed by patacongo
parent 573f02791f
commit f9a886f8b7
1 changed files with 21 additions and 6 deletions
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arch/arm/src/stm32h7/stm32_flash.c
+21 -6
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@@ -339,11 +339,14 @@ FAR struct stm32h7_flash_priv_s * stm32h7_flash_bank(size_t address)
*
* Description:
* Unlock the flash option bytes
* Returns true if the flash was locked before, false otherwise
*
****************************************************************************/
static void stm32h7_unlock_flashopt(FAR struct stm32h7_flash_priv_s *priv)
static bool stm32h7_unlock_flashopt(FAR struct stm32h7_flash_priv_s *priv)
{
bool ret = false;
while (stm32h7_flash_getreg32(priv, STM32_FLASH_SR1_OFFSET) & FLASH_SR_BSY)
{
}
@@ -357,7 +360,13 @@ static void stm32h7_unlock_flashopt(FAR struct stm32h7_flash_priv_s *priv)
FLASH_OPTKEY1);
stm32h7_flash_putreg32(priv, STM32_FLASH_OPTKEYR_OFFSET,
FLASH_OPTKEY2);
/* Was locked before and now unlocked */
ret = true;
}
return ret;
}
/****************************************************************************
@@ -439,7 +448,7 @@ int stm32h7_flash_unlock(size_t addr)
stm32h7_flash_sem_unlock(priv);
}
return ret:;
return ret;
}
/****************************************************************************
@@ -542,13 +551,19 @@ uint32_t stm32h7_flash_getopt(void)
void stm32h7_flash_optmodify(uint32_t clear, uint32_t set)
{
struct stm32h7_flash_priv_s *priv;
bool was_locked;
priv = stm32h7_flash_bank(STM32_FLASH_BANK1);
if (priv)
{
stm32h7_unlock_flashopt(priv);
stm32h7_flash_modifyreg32(priv, STM32_FLASH_OPTSR_PRG_OFFSET,
clear, set);
stm32h7_save_flashopt(priv);
was_locked = stm32h7_unlock_flashopt(priv);
stm32h7_flash_modifyreg32(priv, STM32_FLASH_OPTSR_PRG_OFFSET,
clear, set);
stm32h7_save_flashopt(priv);
if (was_locked)
{
stm32h7_lock_flashopt(priv);
}
}
}