On Mon, Mar 14, 2005 at 10:05:34PM -0500, Matt Kory wrote: > Is it possible to use poll or select to detect a change in the status > bits of the parallel port? I tried something like this, and took bits > 5 and 6 of the status register low and nothing seemed to happen. Is > what I am trying to do even possible, or I am supposed to take a > certain bit low to cause a read event? Any help is appreciated.
Disclaimer: I'm no expert on the parallel port. The man page for ppi(4) says that all I/O is via ioctl(), which isn't covered by the select() mechanism. You'd either have to poll PPIGSTATUS from userland on a timer, or perhaps hack the driver to use a kevent. Considering there's probably no way to get a hardware interrupt for the status change directly via ppi(4), you might need to consider writing a set of custom ppbus microsequences and a driver for your application. Regards, BMS _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
