On Mon, Nov 24, 2003 at 06:16:19PM +0100, Juergen Oberhofer wrote:
|OK. I've written a module which installs a interrupt handler
|(the interrupt is a timer interrupt, generated by a cpm timer on
|a mpc823 board), i.e. every x microseconds the module executes a
|handling function.
|The handling function should read/write from/to a shared memory
|which can be accessed from a program that runs in user mode.
The right solution is to provide a chardev whose file operations
includes a "mmap" method.
Doing so your user space process can "mmap" all the memory your
device driver want to supply.
|To synch. the access to the shm I wanted to use semaphores...
to synch you can use the "fcntl" or "poll" interface from the same file operations
struct (the same that supply mmap)
--
Daniele.
"I could have made money this way, and perhaps amused myself writing code.
But I knew that at the end of my career, I would look back on years of
building walls to divide people, and feel I had spent my life making the
world a worse place."
Richard Stallman
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