nanogui: Keyboard driver
Subject:
Re: [nanogui] keyboard driver
From:
"Greg Haerr" ####@####.####
Date:
17 Oct 2002 18:04:19 -0000
Message-Id: <064c01c27606$b1bf97c0$3aba46a6@xmission.com>
: i have to attach a simple matrix keyboard to my system ... there will be
: a keyboard driver running which will simply scan the pins of keyboard
: and if a key is pressed write a scan code into a buffer in the memory
: (which is a FIFO) .. now how do i write a keyboard driver for
: microwindows which will keep on checking that FIFO to see if it is empty
: or not .. because currently what microwindows does is a select call for
: all the fds and whichver isset it reads from that .. but here this
: process will only work if i can attach a file descriptor to shared
: memory .. can i do that??
Implement the Poll entry point instead, forget the file descriptor.
You'll have to modify nanox/srvmain.c to use the Poll entry
point, look for the #if MSDOS defines, DOS uses the Poll method
rather than select.
: other method i can think of is that i dont check for keyboard from
: select call and after select call returns (by timeout or by an event) i
: also check for keyboard buffer..
You'll have to set a manual timeout or select will hang forever. Then
call the Poll entrypoint.
Regards,
Greg
:
: regards
: vikas
:
:
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