This specific CAN2 config crashes during HAL_CAN_Init(), why

[Javier1]

Lets hope someone has a felicitously revelation, or a clue.

I am using a custom board with a nice stm32f105rbtx, fed with external XTAL.

Everything worked like a charm untill i configured the clock to be 72Mhz and readjusted the can parameters in CUBEMX to match 125.000bauds 

 

when i run the generated code it crashes riight here in HAL_CAN_Init();

 

The init function timeouts right here and returns HAL_ERROR

 

/* Check Sleep mode leave acknowledge */
  while ((hcan->Instance->MSR & CAN_MSR_SLAK) != 0U)
  {
    if ((HAL_GetTick() - tickstart) > CAN_TIMEOUT_VALUE)
    {
      /* Update error code */
      hcan->ErrorCode |= HAL_CAN_ERROR_TIMEOUT;
 
      /* Change CAN state */
      hcan->State = HAL_CAN_STATE_ERROR;
 
      return HAL_ERROR;
    }
  }

I have no idea why the canbus "stays in sleep mode" during initialization with this config.....

CubeMX file attached

Edit: now it happens with every canbus config, even old commits that were working previously.

[Javier1 · Accepted solution]

Not sure howbut i fixed it:

I removed the nodes from the canbus line and flashed them with the canbus not connected,

the nodes are back to normal behaviour, maybe something hardwarewise was happening in the canbus.