Are the digital outputs on the built in 8-8-8 Interface Kit on the SBC triggered by a USB control message? ie. ultimately by a call to CUSBSendPacket()?

Thanks in advance for your help.

bob

The USB hub on the SBC technically has 7 ports. The built in interface kit just uses one of them permanently so we don't expose it. So yes, all communication between the SBC and the interface kit occurs via a USB connection.

_________________
Brian Burley
403-282-7335 ext. 6003
support@phidgets.com

Yes I understand that part. My question concerned the type of USB message used to trigger the digital outputs. Is it a control message? Is it ultimately caused by a call to CUSBSendPacket?

Thanks again in advance for your help.

bob

Yes, it is ultimately a USB control message, via CUSBSendPacket. There is some logic/threading between calls to CPhidgetInterfaceKit_setOutputState and the call to CUSBSendPacket is order to possibly aggregate several setOutputState calls into a single USB message.

-Patrick

I was able to get a libusb-1.0 async version of this control message working once I "stumbled" on the fact that the payload portion of the message was 8 bytes long. Who knew ?

I have been able to "distill" a whack of detailed protocol information about the Phidgets 8-8-8 Interface Kit from the existing C codebase. However, this is far from the most efficient way to go about this exercise.

Meanwhile all my code and progress in this adventure is documented (and freely available) at:

http://www.icanprogram.com/opndrs/phidgets

If anyone wants to jump in and help with the code polishing/documenting/extending ... all volunteers are welcome. It is an open source project.

bob