Use poll or select as suggested here:
Quoted from Sven Lübke on Thu, Aug 14, 2003 at 12:32:20AM +0200.
> Hi all!
> I've just written a LCDproc driver for my VF-Display which is connected
> to the parallel port and now I need a possibility to read in some
> via the same parallel port from a microcontroller, which scans a keypad
> the whole time (and perhaps doing more stuff). The driver gets direct access
> to the ports (0x378 etc.) using ioperm. Data is transferred through
> the data lines (D0-D7) in combination with four output lines (/strobe, /LF
> As I don't want to poll one input line of the parallel port the whole time,
> plan to use the /ack input in combination with an interrupt! Is this
> possible at all using direct access? I searched a lot of sites, but didn't
> the right information. Can someone help me?
> Thank you in advance!
> Best regards,
> Sven Lübke
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