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continuous capture using external trigger TSW1250

Josh Collins
Prodigy 40 points


Hi,

I have a TSW1250EVM and an AFE5808EVM. I need to trigger my system to generate a pulse and want to start a capture on my TSW1250 at the same trigger. I can get this to happen once using the external trigger in the GUI, but after a single capture the trigger reverts back to internal. I need to perform 256 of these in a row. Is it possible to set up the software to allow any number of external triggers to occur?

Alternatively, we have been able to get the TSW1250 to capture a series of sequences usign the continuous capture mode. We could use this method, but we would need to get a hardware trigger signal from the TSW1250 to know when the next capture starts. Is there any output on the EVM that would give this trigger?

Cheers

Josh

  • 0
    TI__Expert 6320 points

    Josh,

    The trigger setting should not revert back to internal as you say. But you do have to press the capture button for each capture. Perhaps what you want is continuous capture.  I don't believe that there is an trigger output signal on the TSW EVM.  In this mode, are you trying to capture with an trigger or software trigger? 

    Thanks,

    Chuck

  • 0 in reply to Chuck Smyth
    Prodigy 40 points

    Sorry you are correct, it does not reset back to internal, what I meant to say was that it reverted back to "unarmed". As we will be making many measurements, we really need to automate the process.

    Continuous capture is exactly what we need, however, it appears the only way to set up continuous capture is by using a fixed time delay between each capture? We need to somehow let our system know when each capture begins so that we can fire the ultrasound pulse, which should then be captured. So if we used this approach, we would need some hardware trigger (from the TSW1250 i suppose) to let us know when each capture begins.

    In the other option, where we continuously trigger the TSW1250 to capture, we would be using a hardware trigger. As discussed though, this does not want to work because after a single capture the GUI reverts back to "unarmed".

    Cheers

    Josh

  • 0 in reply to Josh Collins
    TI__Expert 6320 points

    Josh,

    I understand now. You want to continuously capture and also sync this capture to the rest of your system. I am not sure if this is possible with the current software/hardware.  I will look into this tomorrow.

    Thanks,

    Chuck

  • 0 in reply to Chuck Smyth
    Prodigy 40 points

    Chuck,

    That is correct. If you could let me know your findings as soon as possible that would be greatly appreciated. Also, any suggestions on how this could be accomplished (perhaps using an API for the board rather than the GUI software? I'm not sure what is available in the way of API's for this board) would be great if you do indeed find this is not possible.

    I am using this board for a uni honours project which needs to be finished in the next few weeks so any suggestions on how to do this ASAP would be fantastic.

    Cheers

    Josh

  • 0 in reply to Josh Collins
    TI__Expert 6320 points

    Josh,

    What kind of API are you looking for?  We do have some source code for the TSW1250 GUI.

    Chuck Smyth

  • 0 in reply to Chuck Smyth
    Prodigy 40 points

    Chuck,

    We have used C# to write our control software, if there was a C# API that would be fantastic. Otherwise we were thinking along the lines of a C++ or MATLAB API.

    Is that source code available from the TI website?

    Josh