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pyrpl-fpga / pyrpl

pyrpl turns your RedPitaya into a powerful DSP device, especially suitable as a lockbox in quantum optics experiments.
http://lneuhaus.github.io/pyrpl/
MIT License
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InvalidStateError: Cannot take the result of a future that is never done #479

Open cici-hanna opened 2 years ago

cici-hanna commented 2 years ago

When running the oscilloscope code in section 3.2.3 of this tutorial, I get "InvalidStateError: Result is not set." when I reach line 57, ch1, ch2 = res.result()

This error happens when you try to get the result of a future that isn't done, so its results are not yet available. According to this documentation, however, the future will never be done running:

This Future object is the one controlling the acquisition in rolling_mode. It will never be fullfilled (done), since rolling_mode is always continuous, but the timer/slot mechanism to control the rolling_mode acquisition is encapsulated in this object.

If I create a loop to end when the future stops running, to see if it's running, finishing, and then re-running in a loop, it never ends, so it seems like it just starts running the first time and never stops. So how can I ever get a result?

A-Rob-92 commented 1 year ago

Did you ever get to the bottom of this, I am having the same issue.