S32K144 FlexCAN stop to send message once stop at break point when debug

[xiaoyuwang]

I am using S32K144, peripheral CAN. I met a problem these days. 

Problem Description: For my CAN communication SW, I set several breakpoints in my source code and debug with MicroPE, but I found that once it stops at any break point, my SW will stop to send CAN messages even if SW runs again.

I wonder the root cause and solution for this problem. Looking forward to your answer~~~ Thank you very much!

[danielmartynek]

Hi,
Please see Section 53.5.11.1 RM rev.8 Freeze mode.
“This mode is requested either by the CPU through the assertion of the HALT bit in the CAN_MCR Register or when the chip is put into Debug mode. In both cases it is also necessary that the FRZ bit is asserted in the CAN_MCR Register and the module is not in a low-power mode.”

Freeze Enable is enabled by default MCR[FRZ] = 1.
And it will be disabled if you clear that bit.

Regards,
Daniel