Digital Discovery : How to set DigitalIn Threshold level for 1 or 0 by using python script

[woo chuan chan]

Hi, 

I can set the output voltage and its threshold in the GUI, however, i couldn't find command for it (in SDK reference pdf), if I wanna use python script. Appreciate your help.

thanks.

[attila]

Hi @woo chuan chan

The input threshold is about half of the digital voltage.
See WF SDK manual FDwf(Device)ParamSet DwfParamDigitalVoltage

[woo chuan chan]

15 hours ago, attila said:

Hi @woo chuan chan

The input threshold is about half of the digital voltage.
See WF SDK manual FDwf(Device)ParamSet DwfParamDigitalVoltage

Hi Attila,

By using the DwfParamDigitalVoltage I can set the voltage level let say 2V and the threshold for DigitalIn is 1V, but what can I do if let say I want to set voltage level 2V threshold 1.2V. I wanted to do this because of some signal quality issue (coupling or disturbance) that mess up my DigitalIn.

 

thanks.

[attila]

Hi @woo chuan chan

The DIN use by default weak-pull down, but can also be set to mid for higher sensitivity and pull-up.
If you are only using inputs then you can configure higher voltage. The digital voltage is only used for DIO output high level and the VIO outputs.
To reduce crosstalk twist each wire or at least the sensitive ones with gnd, similar to HS adapter wires:
https://digilent.com/shop/digital-discovery-high-speed-adapter-and-logic-probes/