multiple Digital Discovery logic analyzers via Python

[JeromeBoateng]

Hi,

I have three Digital Discovery boards. I want to use them in logic analysis mode to read simultaneously 20 channels. However, I don't understand how to synchronize them. Also, I want them to start acquisition when a rising edge occurs on any of the inputs. Could you please provide a part of the code for that? 

[attila]

Hi @JeromeBoateng

See the WF SDK/ samples/ py/ DigitalIn_Trigger.py or other similar examples and the pdf manual.

Remove or set to zero option to have DIN0... order: 
dwf.FDwfDigitalInInputOrderSet(hdwf, c_int(0))
Set sampling format to 32 bit and use c_uint samples:
dwf.FDwfDigitalInSampleFormatSet(hdwf, c_int(32))
To trigger on any rising edge on DIN0-19:
dwf.FDwfDigitalInTriggerSet(hdwf, c_int(0), c_int(0), c_int(0xFFFFF), c_int(0))

[JeromeBoateng]

18 hours ago, attila said:

Hi @JeromeBoateng

See the WF SDK/ samples/ py/ DigitalIn_Trigger.py or other similar examples and the pdf manual.

Remove or set to zero option to have DIN0... order: 
dwf.FDwfDigitalInInputOrderSet(hdwf, c_int(0))
Set sampling format to 32 bit and use c_uint samples:
dwf.FDwfDigitalInSampleFormatSet(hdwf, c_int(32))
To trigger on any rising edge on DIN0-19:
dwf.FDwfDigitalInTriggerSet(hdwf, c_int(0), c_int(0), c_int(0xFFFFF), c_int(0))

Thank you for the tip for triggering. And what about synchronization between three Digital Discoveries? 

[attila]

Hi @JeromeBoateng

The DD has 24 DIN and 16 DIO lines so it would be easier to handle all 20 by one device.

Regarding device synchronization see the following post: