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Is PXIe-6548 I2C configurable?
viaheaven
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08-12-2010 12:43 PM
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Hi all,
I tried to implement I2C using PXIe-6548. But it is giving me an error when I try to set drive type as 'open collector'. Is there any niHSDIO software upgrade required to set the drive type property to 'open collector' and not 'active drive'?
I have niHSDIO 1.7.0 installed.
Regards
The_Red_Barron
NI Employee (retired)
08-13-2010 10:42 AM
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Howdy viaheaven!
What is the error that you are receiving when trying to set the drive type as open collector?
According to the NI Digital Waveform Generator/Analyzer Help, "NI 6544/6545/6547/6548 devices support the open collector drive type for static generation operations, which means that they can set the configured data channels to a high-impedance (Z) state when the channels are configured to drive the Generation Voltage High Level."
If you are trying to configure the drive type as open collector for any operation other than static generation then you should receive an error.
Regards,
Barron
Applications Engineering
National Instruments
Applications Engineering
National Instruments
08-13-2010 11:01 AM
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Hey,
I think you can configure a channel to drive 'z' not only in static but also in dynamic generation. Beceause, when I set the 'supported data states' property to '0,10,H,L,X,Z' it worked fine.
Regards
08-13-2010 11:10 AM
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Hi,
I am attaching the error message for your reference
Regards
The_Red_Barron
NI Employee (retired)
08-16-2010 11:14 AM - edited 08-16-2010 11:14 AM
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Where are you setting this "supported data states" property?
According to the HSDIO Help the open collector drive type is supported for dynamic generation with 655x devices. For your device, the 6548, you can only use the open collector drive type for static generation:
"NI 654x devices support open collector generation only for static generation"
Regards,
Barron
Applications Engineering
National Instruments
Applications Engineering
National Instruments
The_Red_Barron
NI Employee (retired)
08-16-2010 12:39 PM
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On second thought, since you are trying to do I2C I think that you will want to use the high-impedance Z state (not open collector) since the 6548 can do per cycle tri-state like the 655x devices. Don't try to configure the board to be open collector. Instead just set up a dynamic generation session and set up the cycle tristating.
Look over this tutorial for more information about per-cycle control and stimulus response.
You might also find this reference library useful when creating your waveforms to generate.
Regards,
Barron
Applications Engineering
National Instruments
Applications Engineering
National Instruments
