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Forum Topic - QNX and Industrial Ethernet field bus: (6 Items)

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JERONIMO SANCHEZ DE LA VEGA

10/23/2009 3:22 AM

post40584

QNX and Industrial Ethernet field bus

I am analyzing Industrial Ethernet fieldbus like EtherCAT and Powerlink in order to use them in an embedded PC platform 
with QNX.
I suppose that it is necessary some API in order to communicate with the bus. Could anybody give me some information 
about this matter?

Thanks

Andrew Boyd(deleted)

10/23/2009 9:25 AM

post40605

RE: QNX and Industrial Ethernet field bus

> necessary some API in order to communicate with the bus

Er, you don't actually interface directly 
with a bus, you need a software driver that
will talk to whatever hardware that interfaces
to it.

For example, you might have a PCI adapter
card which has the hardware interface that
you want, and you need a software driver that
talks via the PCI bus to the adapter card.

Clear as mud?

--
aboyd

JERONIMO SANCHEZ DE LA VEGA

10/27/2009 4:15 AM

post40735

Re: RE: QNX and Industrial Ethernet field bus

Yes, I understand I need some API, but my doubt is if there is some open source API or I need to pay some license, for 
these field buses.
And other possible problem is the integration of this API with QNX.

Andrew Boyd(deleted)

10/27/2009 9:29 AM

post40771

RE: RE: QNX and Industrial Ethernet field bus

> integration of this API with QNX.

One common idea is to use a QNX Resource Manager.

It's a really simple framework that allows
you to integrate a service into the file system.

For example, you take over /dev/fubar, and
when a client wants to transmit binary data
on the bus, he calls open() and then write(),
and to receive binary data on the bus he calls
read().  My kid wrote one recently.

Start reading here:

http://www.qnx.com/developers/docs/6.3.2/neutrino/prog/resmgr.html

--
aboyd

JERONIMO SANCHEZ DE LA VEGA

10/27/2009 12:29 PM

post40813

Re: RE: RE: QNX and Industrial Ethernet field bus

Andrew, I have been working with resource managers since a lot of time, I agree with you. The matter is the integration 
of this API, for instance, with io-net, (I'd like to use Industrial Ehternet), the licenses, the open-source, etc.

Andrew Boyd(deleted)

10/27/2009 12:34 PM

post40815

RE: RE: RE: QNX and Industrial Ethernet field bus

> integration of this API, for instance, with io-net

If you can wedge it into an io-pkt (native devnp)
ethernet driver, you can take advantage of an awful
lot of existing infrastructure - stuff just starts
working.

For special stuff, I might suggest implenting some
private driver devctls - I've done that in the past
for some network drivers, to support additional
functionality (powering up and down ports, reading
and writing registers, etc)

--
aboyd

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