Hello,
I have the following problem with STM32F429ZI: When applying RDP level 1 protection, the board gets stuck if I press the reset button. More precisely, I can see from STM32CubeProgrammer that SPRMOD and BFB2 bits have risen and that the value of RDP becomes FF (not “55�? as I would expect for RDP level 1). The only way to make the board work again is to apply RDP level 0 manually using STM32CubeProgrammer.
To reproduce the error, download the “UART_Printf�? example for the STM32F429ZI-Nucleo (from Github STMicroelectronics/STM32CubeF4, unfortunately, I can not add the links) and modify main.c like this:
void TurnOnRDP() {
FLASH_OBProgramInitTypeDef obConfig;
HAL_FLASHEx_OBGetConfig(&obConfig);
if (obConfig.RDPLevel == OB_RDP_LEVEL_0) {
printf("\n\r Applying RDP-1");
// this is first time we run mcu after flashing firmware
obConfig.RDPLevel = OB_RDP_LEVEL_1;
HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
HAL_FLASHEx_OBProgram(&obConfig);
HAL_FLASH_OB_Launch();
}
}
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Initialize BSP Led for LED2 */
BSP_LED_Init(LED2);
/*##-1- Configure the UART peripheral ######################################*/
/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
/* UART configured as follows:
- Word Length = 8 Bits (7 data bit + 1 parity bit) :
BE CAREFUL : Program 7 data bits + 1 parity bit in PC HyperTerminal
- Stop Bit = One Stop bit
- Parity = ODD parity
- BaudRate = 9600 baud
- Hardware flow control disabled (RTS and CTS signals) */
UartHandle.Instance = USARTx;
UartHandle.Init.BaudRate = 115200;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_RX | UART_MODE_TX;
if (HAL_UART_Init(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
TurnOnRDP();
/* Output a message on Hyperterminal using printf function */
printf("\n\r UART Printf Example: retarget the C library printf function to the UART\n\r");
printf("** Test finished successfully. ** \n\r");
/* Infinite loop */
while (1)
{
}
}
Then, program the board using STM32CubeProgrammer making sure “run after programming�? is not set. Then, click the reset button repeatedly very fast: the first reset will start the software execution, one of the other resets should happen when RDP level 1 is being applied, which results in the issue described above.
