MMWAVE-SDK: Accessing messages of "System_printf" via UART without CCS

Anirudh Ramesh42

Part Number: MMWAVE-SDK

Hi,

I have been able to spot this image from the Gesture Recognition Lab (I'm not interested in that application, however):

I'm currently using the Demo app in the SDK, which does have the same debug messages thrown out using the System_printf, as follows.

System_printf ("Debug: Launching the Millimeter Wave Demo\n");

I'm unable to find out how to access these messages:

Are these messages enabled in the Demo MSS firmware? If not, how do I enable these?
Through which hardware interfaces are these messages sent? If these were not through UART, would I be able to access them without using CCS (since I'm using Linux for development)?

Thanks,

Anirudh

over 7 years ago

0 Nitin Sakhuja over 7 years ago

TI__Mastermind 30405 points

Anirudh,

When a program is run via CCS debugger, CCS provides the required infrastructure for stdin, stdout and stderr through the CIO protocol as defined here: http://processors.wiki.ti.com/index.php/CIO_System_Call_Protocol, and allows programs to use standard C input and output functions such as printf and scanf. CCS sends the output of System_printf to the console over JTAG.

CIO is not available to the program when running outside the CCS debugger. There may be ways to implement CIO support in your program and process the output on a host but I am not an expert at this so I would recommend you to post this message on CCS E2E forum. I did a quick E2E forum search for CIO and printf wihtout JTAG and found the following threads which appear to be similar to your question

https://e2e.ti.com/support/development_tools/compiler/f/343/t/656653

https://e2e.ti.com/support/development_tools/compiler/f/343/p/647834/2380346

Best would be to post this question on CCS forums and search the forums for existing discussions on this topic.

Regards

-Nitin

0 Nitin Sakhuja over 7 years ago in reply to Nitin Sakhuja

TI__Mastermind 30405 points

Anirudh,

I would like to add that CCS is available for Linux as well. So you should be able to use the CCS debugger with JTAG and get the above messages on CCS under Linux as well.

processors.wiki.ti.com/.../Download_CCS

Thanks
-Nitin

0 Anirudh Ramesh42 over 7 years ago in reply to Nitin Sakhuja

Prodigy 170 points

Hi, Nitin,

Thanks very much for the answer!

Am I understaning correctly that the JTAG in the xWR16xx is connected to the XDS110 on the BoosterPacks? Does the XDS110 firmware expose the JTAG as well (in addition to the MSS and DSS loggers, and the CLI's RS232) over the USB pins?

Thanks,

Anirudh

0 Nitin Sakhuja over 7 years ago in reply to Anirudh Ramesh42

TI__Mastermind 30405 points

That is correct, the IWR1xxxBOOST EVMs have an XDS110 onboard JTAG emulator which is connected to the device JTAG. The USB port exposes the control and data UARTs as well as the JTAG.

0 Anirudh Ramesh42 over 7 years ago in reply to Nitin Sakhuja

Prodigy 170 points

Hi, Nitin,

Thanks very much - I think that should resolve my issue.

Anirudh

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MMWAVE-SDK: Accessing messages of "System_printf" via UART without CCS