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trouble using IAR + Segger Jtrace pro + trace functionality

Question asked by dieter 123 on Jul 20, 2017


I have designed a board with a STM32 L476Z. I am trying to get trace working.

Are there any HW design guidelines when using trace pins?

After FW download with IAR and enabling function trace, i get the following error message from segger Jlink driver:

""""Ltrace:(time since start 0.0000 021, thread RX): unknwon packet received from Jtrace. communication time out: requested 4 bytes , received 0 bytes. Abort debug session """"

After this message Segger has crahsed and has to be power plugged.

Any idea?