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lneuhaus / 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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Analog inputs and outputs? #401

Closed gsteele13 closed 4 years ago

gsteele13 commented 4 years ago

Is there any support for the "slow" analog inputs and outputs?

At first it seemed that the AMS module was what I was after, but the code gave me the impression that the Analog I/O is not really implemented? 

    """mostly deprecated module (redpitaya has removed adc support).
    only here for dac2 and dac3"""
    addr_base = 0x40400000

(I'd like to use them to read out a PT100 sensor...)

It's not clear to me that RP had chosen to remove ADC support, it is still present in their SCPI server:

https://redpitaya.readthedocs.io/en/latest/appsFeatures/remoteControl/SCPI_commands.html

Thanks, Gary

lneuhaus commented 4 years ago

The ams module allows to set the slow analog PWM outputs dac2 and dac3. The other two, pwm0 and pwm1, can be found in extra modules - see an example here https://github.com/lneuhaus/pyrpl/blob/develop-0.9.3/docs/example-notebooks/pwm-example.ipynb

The slow analog inputs are currently only supported in the branch max_hold_no_iir of PyRPL. There you can find them in the ams module. The input voltage range is -3.5 to +3.5 V. I will soon merge this to master.