I have done this as well, and it is pretty simple. I selected a record field
which was not being used (the PHAS field in this case) and used it as a
means to communicate to device support the direction of the transaction. If
PHAS is set to 0, the device support reads data from the hardware, otherwise
it writes. I am using INST_IO, so there is probably a way to encode the
direction in what gets passed to the INP field as well, but that would have
top be decoded by the device driver. I didn't want to do this because the
driver is generic for all the record types we are using.
Erik
----- Original Message -----
From: "Ned Arnold" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Wednesday, May 09, 2001 10:37 AM
Subject: Re: block output record
> Geoff,
>
> The existing waveform record can be used as a "block output" record by
> writing device support that reads from the waveform record array and
writes
> to hardware. The "direction" of the data is up to device support.
>
> Ned
>
> >
> > yes
> >
> > Ned Arnold wrote:
> > >
> > > I'm not familiar with that terminology. Is that the same as a waveform
> output
> > > record?
> > >
> > > Ned
> > >
> > >
> > > >
> > > > Hi,
> > > >
> > > > Has anyone developed a block output record?
> > > >
> > > > Geoff
>
>
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