flash_stm32: don't unlock flash if already unlocked (#13841)
On stm32f4 after reboot from DFU it was observed that the flash is already unlocked. In that case, attempting to unlock it again causes a data abort.
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@ -161,9 +161,11 @@ FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data) {
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* @retval None
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*/
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void FLASH_Unlock(void) {
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if (FLASH->CR & FLASH_CR_LOCK) {
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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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}
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/**
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