Has anyone here ever used the Linux serial port drivers as general
purpose I/O? By that I mean not using the port for RS-232 protocol
communications, but querying and setting the levels of individual pins
on the port. This is for an embedded systems project I'm working on.
If I have no other options, my plan is to write a /proc kernel driver so
user space programs can get access to this information, but I have a
strong feeling that this kind of thing has been done many times before,
and may even be possible with existing utilities that I just don't know
about.
setserial, for example, allows you to configure the port and IRQ that a
serial device is set to. I want something just a bit higher-level than
that, to be able to read/set the RTS pin, for example.
The serial devices I'm working with are plain vanilla 16550 UARTs on
common PC hardware.
Thanks,
Scott
PS - Information on doing the same thing via the parallel port would
also be very relevant to me.
--
Scott Garman
sgarman at iname dot com
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