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Disable BOR in option bytes if enabled. #8

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Merged
evoggy merged 1 commit into from
Apr 14, 2026
Merged

Disable BOR in option bytes if enabled. #8

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28 changes: 28 additions & 0 deletions Core/Src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,31 @@ static uint16_t convertAdcToMilliamps(uint8_t adc_8bit, uint16_t sense_resistor_
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/**
* @brief Disable Brown-Out Reset (BOR) if it is currently enabled in the option bytes.
*/
static void disable_bor_if_enabled(void) {
if (FLASH->OPTR & FLASH_OPTR_BOR_EN) {
FLASH_OBProgramInitTypeDef ob_cfg = {0};

HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();

ob_cfg.OptionType = OPTIONBYTE_USER;
ob_cfg.USERType = OB_USER_BOR_EN;
ob_cfg.USERConfig = OB_BOR_DISABLE;

HAL_FLASHEx_OBProgram(&ob_cfg);

/* Launch option byte reload - this triggers a system reset */
HAL_FLASH_OB_Launch();

/* Should not reach here as OB_Launch resets the MCU */
HAL_FLASH_OB_Lock();
HAL_FLASH_Lock();
}
}

/* USER CODE END 0 */

/**
Expand All @@ -117,6 +142,9 @@ int main(void)

/* USER CODE BEGIN Init */

/* Disable BOR in option bytes if it is currently enabled */
disable_bor_if_enabled();

/* USER CODE END Init */

/* Configure the system clock */
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