Unexpected behavior with Mirny's set_frequency and set_output_power_mu

merlin

Hello,

I found, that if you're trying to use either set_frequency or set_output_power_mu isolated in an experiment, it does not produce the result I expect.

For the set_frequency it will set the given frequency, but also increases the output power to the maximum.

For set_output_power_mu, if I don't set the frequency somewhere within the same experiment, it just seems to turn the output completely off.

The functions appear to only work when used directly together.
Is this behavior expected, and is there a way to set only one without the other?

rjo

That's inherent to the design introduced in https://github.com/m-labs/artiq/pull/1530
where the driver now assumes it has an accurate shadow state of the PLL registers. That assumption doesn't hold in your case.