Firmware does not run properly after stop and start

[Lukas1]

Hi,

I'm currently working with the STM32MP157-DK2.

I built a firmware to run on the Cortex M4.

To load/start/stop the firmware by the A7 I use :

echo -n "firmware_name" > /sys/class/remoteproc/remoteproc0/firmware

echo -n start > /sys/class/remoteproc/remoteproc0/state

echo -n stop > /sys/class/remoteproc/remoteproc0/state

So far it works fine.

If I run the firmware the first time after a reboot all works fine. But if I stop the firmware, load and start again it begins to run and hangs up.

periphery the fw uses: SPI, GPIO, TIM, DMA, DDR, UART

third party: openAMP, FreeRTOS, virtUart, RESMGR_UTILITY

Is it possible to reset M4 and the peripherals without rebooting A7?

thanks in advance

regards

Lukas

[PatrickF]

Hello,

this is a known limitation, and today, there is various options to make it working:

• Reset each M4-side assigned peripherals from RCC using Cortex-A7 (Linux). This is probably not straightforward.
• On Cortex-M4 code, before peripherals init:
  • Reset each required peripherals from RCC using CubeMP1 macro (e.g. __HAL_RCC_xxxx_FORCE_RESET(); )
  • Deinit each required peripherals using CubeMP1 functions (e.g. HAL_xxxx_DeInit(&hxxxx); )

Last option is the recommended way.

Obviously, not all peripherals are concerned, e.g. GPIO has not to be reset.

Regards

[Lukas1]

Hi @PatrickF​ ,

thanks for your fast reply.

I tried this in main before init:

__HAL_RCC_TIM5_FORCE_RESET();

__HAL_RCC_SPI4_FORCE_RESET();

__HAL_RCC_SPI5_FORCE_RESET();

__HAL_RCC_IPCC_FORCE_RESET();

HAL_IPCC_DeInit(&hipcc);

HAL_DMA_DeInit(&hdma_memtomem_dma2_stream1);

HAL_SPI_DeInit(&hspi4);

HAL_SPI_DeInit(&hspi5);

Unfortunately it does not work. Now the firmware hangs up even on the 1st start

best regards

Lukas

[PatrickF]

My answer was a bit misleading.

it is either use of RESET or DeInit. Both are overkilling.

When FORCE_RESET is used, need to put a RELEASE_RESET just after (otherwise peripheral is kept in reset and this explain why it hang during init).

Usually, DeInit function is the better option (not need to use reset).

[Lukas1]

@PatrickF​ 

Unfortunately it still does not work. It hangs up at the second start. Seems like it hangs up when I want to use SPI

[PatrickF]

I think debugging you FW could help to see where it hang precisely.

[Lukas1 · Accepted solution]

@PatrickF​ 

I tried the following and now it works. I added HAL_Init() in front of the reset/DeInit

int main(void)
{
  /* USER CODE BEGIN 1 */
	HAL_Init();
	__HAL_RCC_HSEM_CLK_DISABLE();
	__HAL_RCC_TIM5_FORCE_RESET();
	__HAL_RCC_TIM5_RELEASE_RESET();
	__HAL_RCC_TIM7_FORCE_RESET();
	__HAL_RCC_TIM7_RELEASE_RESET();
 
	HAL_IPCC_DeInit(&hipcc);
	HAL_SPI_DeInit(&hspi4);
	HAL_SPI_DeInit(&hspi5);
	HAL_DeInit();
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
...