NRF_BLE_FREERTOS_SDH_TASK_STACK not enough

[Aurele]

Hello,

I have faced a lot of issues that were causing hardfault on my device. I'm using FreeRTOS with nrf52. I was suspecting stack overflow but it wasn't so easy to identify. When i have introduced the bonding, the issue occured more often and by exploring the stack and going back into the upper address i think i found out what it is. Indeed, i think the soft device stack size is not enough. It has been set to 256 bytes in nrf_sdh_freertos.c file (NRF_BLE_FREERTOS_SDH_TASK_STACK)

I have tested by setting it at 512 bytes and all issues disappeared.

Am i right ? Is someone else facing the same issue ?

Regards,

Aurélien

[kirkus]

Yes, I had to do the same thing with my project.

You can configure FreeRTOS to help catch stack overflows in your FreeRTOSConfig.h. For example, I use:

#define configCHECK_FOR_STACK_OVERFLOW  ( DEBUG ? 2: 0 )

You can also measure the stack high water mark. For example, in nrf_sdh_freertos.c's softdevice_task I have a snippet to measure:

#if DEBUG
        UBaseType_t uxHighWaterMark;
        uxHighWaterMark = uxTaskGetStackHighWaterMark( m_softdevice_task );
        NRF_LOG_INFO("BLE HWM = %u", uxHighWaterMark);
#endif

[Aurele]

Hi,

thank you very much for the reply. Since i have made the modification, my device has never been more stable than right now.

Thank you for all tips you give for debug, it will help me for sure ;)

Regards,

Aurélien