TMDSEMU110-U: XDS110 UART port mapping

Andreas Stolze

Part Number: TMDSEMU110-U

Hi all,

I am a bit confused with the UART capability of the XDS110.

Looking at the user guide (https://www.ti.com/lit/pdf/sprui94), 1 UART is mentioned and as far as I understand is referred to the UART port on the auxiliary connector. So far, so food.

However, when looking in the device manager, 2 COM ports are presented:

Further more, when looking at this page, which is found via google: https://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_xds110.html

It's also mentioned, that when using cJTAG, TDO and TDI can be used as UART.
You'll find a setting in CCS which covers this apparently:

My question is what COM port is mapped to where.

Which COM port is mapped to the physical auxiliary port of the XDS110?
Where is the other port mapped to?
What does change with the option "Auxiliary COM Port Connection" when using cJTAG?

Thanks a lot,
Andreas

over 2 years ago

0 Santosh Jha over 2 years ago

TI__Guru 50611 points

Andreas,

Which device you are trying to connect?

Regards, Santosh

0 Andreas Stolze over 2 years ago in reply to Santosh Jha

Prodigy 80 points

This is a general question, it should be answered in without any specific device in mind. (Of course the device must support cJTAG if you would want to use the cJTAG UART).

However, currently we're using e.g. a C2000 F28003x µC.

0 Santosh Jha over 2 years ago in reply to Andreas Stolze

TI__Guru 50611 points

Andreas,

I will get back to you by tomorrow. Today is US holiday.

Regards, Santosh

0 Andreas Stolze over 2 years ago in reply to Santosh Jha

Prodigy 80 points

That's fine, thank you!

0 Santosh Jha over 2 years ago in reply to Andreas Stolze

TI__Guru 50611 points

Andreas,

It is mapped to SCIA on your target device. You will still need to do required pinmux for SCI.

Regards, Santosh

0 Andreas Stolze over 2 years ago in reply to Santosh Jha

Prodigy 80 points

Hi Santosh,

to which of the questions are you referring to?

And isn't the mapping to the controller dependent on the HW layout? Is your answer related to an evaluation board?

I am asking these questions to understand how to use it in a new hardware design.

I would also love to read about this in the documentation, if you point me to the right one.

Thanks,
Andreas

+1 Andreas Stolze over 2 years ago in reply to Andreas Stolze

Prodigy 80 points

By chance, the forum suggested me this thread:
https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/673240/tm4c1294ncpdt-xds110-debug-probe-uart-port-mapping-pin

Accordng to this, I would answer as followed:

Which COM port is mapped to the physical auxiliary port of the XDS110?
XDS110 Class Auxiliary Data Port

Where is the other port mapped to?
Internally in the XDS110, it is not relevant for the user

What does change with the option "Auxiliary COM Port Connection" when using cJTAG?
Instead of being connected to the physical auxiliary port of the XDS110, this COM Port is mapped to TDO and TDI

Can you confirm this?

Thanks,
Andreas

0 Santosh Jha over 2 years ago in reply to Andreas Stolze

TI__Guru 50611 points

Andreas,

Yes, that is correct.

Regards, Santosh

Arm-based microcontrollers

Arm-based microcontrollers forum

TMDSEMU110-U: XDS110 UART port mapping