Optional "pulse" waveform option for galvo

[conorhughmcfadden]

Resonant galvos work differently from linear galvos: they run at a fixed frequency with only the amplitude being controllable by a DC input voltage. I'm tired of fiddling with the little USB voltage generators every time I image. The goal is to have a simple pulse which can run the resonant galvo while acquiring, but is otherwise silent.

Example config

galvo:
  amplitude: 0.3
  hardware:
  channel: PCIe-6738-A/ao8
    max: 5
    min: 0
    name: daq
    type: NI
  name: resonant_galvo
  offset: 0
  phase: 0.0
  waveform: pulse

Pretty basic pulse, delayed by camera delay and lasting sweep time duration.
Creates a waveforms.single_pulse for the galvo with just amplitude as a user flex parameter.