Thanks everyone for the suggestions.  Segger RTT looks like it could be the 
perfect solution.  It actually sounds very similar to semihosting.  

I am trying to use this with an ST-Link V2 and STM32 cortex m3 processor.  Does 
anyone know if it has been tested on this?  I've added the module, but it 
doesn't seem to be working.  I have used the debug target to start gdb and my 
program.

Thanks again,
Anthony

[photo]
Anthony Merlino
CTO & Co-founder, Verge Aero
(609)-319-1399 [tel:(609)-319-1399]
On 1/21/2017 2:35:16 PM, Michael Andersen <mich...@steelcode.com> wrote:
More details in the rtt_stdio readme 
https://github.com/RIOT-OS/RIOT/blob/master/sys/rtt_stdio/README.md 
[https://github.com/RIOT-OS/RIOT/blob/master/sys/rtt_stdio/README.md]

On Jan 21, 2017 11:32 AM, "Michael Andersen" <mich...@steelcode.com 
[mailto:mich...@steelcode.com]> wrote:

Hey, I use Segger RTT. I believe my changes were merged in to RIOT as rttstdio. 
You get very high performance studio without a UART. It should be as simple as 
adding the module to your makefile.

On Jan 21, 2017 10:41 AM, "Anthony Merlino" <ant.merl...@gmail.com 
[mailto:ant.merl...@gmail.com]> wrote:

Hi everyone,

Has anyone used semihosting with an ARM core to allow them to use the debugger 
for stdio for the shell? I don't have an available UART on this board I'm 
developing for. My two options are USB or semihosting with the debugger. As USB 
currently is unsupported with Riot, it'd be great to figure out how to utilize 
semihosting in the meantime.


Any info is appreciated.

Sincerely,
Anthony

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