Posted on September 18, 2017 at 10:49I don't know the 'official' way to do this.
The way I do this is to download some code to RAM which disables readout protection.
I don't know how you'd specify building a project to download directly into and execute from RAM from your development environment.
But my code essentially does:
Old version:
int main(void) {
FLASH_Status protector;
FLASH_OB_Unlock();
FLASH_OB_WRPConfig(OB_WRP_Sector_All, DISABLE);
/* protector = */FLASH_OB_RDPConfig(OB_RDP_Level_0);
protector = FLASH_OB_Launch();
FLASH_OB_Lock();
logU(protector);
logString(' Unlock Complete\n');
return 0;
}
Newer version:
uint32_t SystemCoreClock;
int main(void) {
SystemCoreClock = 16000000;
HAL_InitTick(TICK_INT_PRIORITY);
/* Unlock the Flash to enable the flash control register access *************/
HAL_FLASH_Unlock();
/* Unlock the Options Bytes *************************************************/
HAL_FLASH_OB_Unlock();
HAL_StatusTypeDef rc = FLASH_If_WriteProtectionConfig(OB_WRPSTATE_DISABLE);
if (rc == HAL_OK) {
/* Generate System Reset to load the new option byte values ***************/
HAL_FLASH_OB_Launch();
/* Lock the Options Bytes *************************************************/
HAL_FLASH_OB_Lock();
debug_printf('Successful');
}
logString(' Unlock Complete\n');
return 0;
}
Hope this helps,
Danish
