Hello ,
I have also pctio10 cards , ISA based (make Advantech and
NI) . I developed a device driver for Linux as well as rt_linux .
The procedure you are following for the data passing between user/kernel
space is correct for the Linux . But in the rt_linux you should use
rt_fifo/mbuff . I think in your case rt_fifo is more appropriate .Please
go through the following functions .....
rtf_create , rtf_get , rtf_put , rtf_create_handler and so on.....
this may help you . If any doubt E-mail me without any hegitation .
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On Tue, 7 Aug 2001, yeshayahu, Liat wrote:
>
> Hi,
> I'm using RTLinux 2.2.18 ,
> I wrote a device driver for device called pctio10 which is sitting on isa
> bus on address 1a0.(the device has counters mechanism that can create
> interupts to isa bus ).
> using the book "linux device driver" I'm trying to pass parameter from user
> application, simple c program to my device ( which is in kernel module).
> In the user application I'm using :
> the open function to get file descriptor , which I use for the read/write
> functions.
> I can see by dmesg and debug prints that I'm getting into to the appropriate
> function
> in my device module.
> the problem is that I can't pass void *buf, size_t nbyte parameters in
> read and write functions
> ssize_t write(int fildes, const void *buf, size_t nbyte);
> ssize_t read(int fildes, void *buf, size_t nbyte);
> from user application to the appropriate functions in the device driver
> code because the information doesn't seems to beat
> the read/write parameters interface at the read/write function.
> later on I attend to use the function copy_to_user, and copy_from_user.
> Does anyone know why I can't pass the parameters to the device driver ?
>
> Thx,
> Liat
>
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