CCS6: Real Time Data Exchange

Brian Walsh

Hi,

i am currently running a realtime application on a F28035 and I would like to transmit data (variable values) from the DSP to the PC. There is a USB connection using a XDS100v1 USB probe.

What I can do is fill an array on the DSP and transmit that when full triggered by a breakpoint which is configured as "write data to file".
Problem: Not very flexible, no way to analyze the data in realtime and limited memory capacity on the DSP.

I read about the Real Time Data eXchange (RTDX), which seemed the be exactly what I am looking for. Unfortunately RTDX is no longer supported, so I can not find it in CCS6.

Question: What is the replacement for RTDX in CCS6 / F28035 ?

- Brian

Edit: I found the "From RTDX" and "To RTDX" blocks in Simulink. Is it possible to use them even if the CCS I'm using is not supporting RTDX anymore ?

over 9 years ago

0 Gautam Iyer over 9 years ago

Guru 192875 points

Hi Brian,

You can go through this wiki article: processors.wiki.ti.com/.../Real-Time_Mode_Debug_with_CCStudio

Regards,
Gautam

0 Brian Walsh over 9 years ago in reply to Gautam Iyer

Intellectual 460 points

Hi Gautam,

thanks for the reply.

As I understand it, the Real-Time Debug Mode allows me to watch selected 'expressions' which are refreshed in the configured inverval. The minimum interval is 100 ms.
The data I am interested in changes a few hundred times a second and not just 10/s. Additionally I need to save/export the data for later analysis.
Did I miss something and this is also possible with Real-Time Debug Mode ?

- Brian

0 Gautam Iyer over 9 years ago in reply to Brian Walsh

Guru 192875 points

Brian Walsh said:
The data I am interested in changes a few hundred times a second and not just 10/s.

This is not possible. 100ms too is the worst case which warns you that the debugger could get unstable. Atleast 500ms update rate is what is recommended.

Brian Walsh said:
Additionally I need to save/export the data for later analysis.

You can refer these links:

Regards,

Gautam

0 Brian Walsh over 9 years ago in reply to Gautam Iyer

Intellectual 460 points

For both options I need to allocate memory on the DSP and take a snapshot (copy data) by hand.
It's a real pity the RTDX feature was able to do a real time export (as I understand) and has been removed without a real alternative.

If that is true, it's very difficult to realize a analysis of e.g. the transient oscillation of a real time control loop, if there are several thousand samples in the specific timespan.

I am sure, that there are many users with the same issue.

- Brian

0 Jeff Stafford over 9 years ago in reply to Brian Walsh

TI__Expert 4595 points

Hi Brian,

For real-time data-logging (saving variables in the 50 - 100 us ISR) our motor control team uses the SPI to interface a 3rd party product that provides a SPI to USB link to the PC, see FTDI C232HM-DDHSL-0 datasheet.

Jeff

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0 Brian Walsh over 9 years ago in reply to Jeff Stafford

Intellectual 460 points

Hi Jeff,
thank you for the reply !
This sounds like a good solution. I will try to use the SCI interface, as I am already using both SPI Ports.

- Brian

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CCS6: Real Time Data Exchange