- From: Wensheng Wang <wenshenw_at_q-free.com>
- Date: Wed, 20 Sep 2006 09:54:52 +1000
Thanks, Jan 在 2006-09-20三的 00:17 +0200，Jan Gukelberger写道： > Hi Wensheng, > > On Tue, 2006-09-19 at 16:04 +1000, Wensheng Wang wrote: > > Hi guys, > > I am working with comedi but have problems now. > > I tried to use select() call to scan data incoming, it > > seemed that I always got timeout and the device file > > change couldn't be reported (my digital I/O card > > doesn't support comedi_command). > > I'm not sure what you are trying to do. If your card does not support > commands, you cannot "wait for data". > You can read the state of a digital input channel via comedi_dio_read(). > With your respond now I can stop trying select(), poll() or something stupid else, but I really need to scan all these digital I/O channel and only read updated data. Could you show me how to use comedi_dio_read() or other methods to get the only updated data ? Thank you very much in advance. Cheers, Wensheng
Received on 2006-09-19Z22:54:52