nTRST with Debug+ETM connector on ULINK PRO

[kb_it]

Posted on February 04, 2015 at 12:58

I am using ULINK-PRO to debug a STM32F4.  I have connected the target as per the Cortex Debug+ETM 20 pin.  I have connected TRACE_D1 to nTRST as I believe these pins are multiplexed within the ULINK PRO.  i.e. nTRST which is pin 3 of the Standard JTAG connector is linked to pin 16 of the Cortex Debug+ETM connector.

Is this correct?

The STM32F4 errata says nTRST must be connected to initialize debug but this makes it incompatible with the Cortex Debug+ETM connector.

The debug seems to be OK but we have not yet needed the trace facility (apart from the sw printf).  I have used the same connections for about 5 different target boards.

nTRST is an input TRACEDATA[1] is an output    so how will this work?

[Tesla DeLorean]

Posted on February 04, 2015 at 15:19

The ULinkPro works with this board

http://www.keil.com/mcbstm32f400/mcbstm32f400-schematics.pdf

I'd have to review the errata to understand what's going on there.