Halting the FDCAN peripheral during debugging break points.

[Zainulabedeen]

On STM32H733, the HAL provides __HAL_DBGMCU_FREEZE_FDCAN() in stm32h7xx_hal.h but it is conditionally compiled:

#if defined(DBGMCU_APB1HFZ1_DBG_FDCAN)
#define __HAL_DBGMCU_FREEZE_FDCAN()  (DBGMCU->APB1HFZ1 |= (DBGMCU_APB1HFZ1_DBG_FDCAN))
#endif

DBGMCU_APB1HFZ1_DBG_FDCAN is not defined in stm32h733xx.h, so the macro does not exist at compile time and calling it gives:

error: implicit declaration of function '__HAL_DBGMCU_FREEZE_FDCAN'

Questions:

1. Is FDCAN freeze during debug halt supported on STM32H733?
2. If yes, why is DBGMCU_APB1HFZ1_DBG_FDCAN missing from stm32h733xx.h — is this a bug in the device header?
3. What is the correct bit position to use as a workaround via direct register write?

 

I need to pause the FDCAN peripheral during debugging, that is my goal.

 

Thanks you very much for helping me out.

 

[mƎALLEm]

 

Hello,

I’m analyzing this. I’ll get back to you.

In fact for STM32H743 (RM0433) I’m seeing, the register has been removed from the RM :

It was available in an old version of RM0433:

while it’s available in the HAL :

stm32h7xx_hal.h:

stm32h743xx.h: 

I will check internally and I’ll get back to you.