Posted on November 21, 2016 at 18:10Looking to see if someone can shed some additional light on programming the memory read protection level 1 or 2 for a STM32F030 device. There are a few examples but they perform other options that are not required for my application. I have unlocked the flash but experiencing questions on whether or not to set the user data 0 & 1 option bytes before setting the read protection in the flashprotect function and what other code is required.
void unlockflash(void)
{
while ((FLASH->SR & FLASH_SR_BSY) != 0)
if ((FLASH->CR & FLASH_CR_LOCK) != 0)
{
FLASH->KEYR = FLASH_FKEY1;
FLASH->KEYR = FLASH_FKEY2;
}
if ((FLASH->CR & FLASH_CR_OPTWRE) == 0)
{
FLASH->OPTKEYR = FLASH_OPTKEY1;
FLASH->OPTKEYR = FLASH_OPTKEY2;
}
}
void flashprotect(void)
{
OB->RDP |= 0xAA; // program read protect, 0xAA level 0, 0xAB level 1, 0xCC level 2.
}
/* main: initialize and start the system */
void asmfunc(void);
int __attribute__((naked)) main(void)
{
osKernelInitialize( ); // initialize CMSIS-RTOS
SystemCoreClockConfigure( ); // configure System Clock
configureGPIO( ); // configure GPIO's
unlockflash( ); // unlock flash
flashprotect( ); //read/write protect flash
asmfunc( ); // jump to assembly code
osKernelStart( ); // start thread execution
}
#stm32-read-protection
