--- In "charliem_1216" <> wrote:
>
> --- In "moonlightshard" <moonlightshard@> wrote:
> >
> > --- In Jim Jackson <jj@> wrote:
> > >
> > >
> > > [don't top post]
> >
> > Ok
> >
> > > Are you trying to write an IRQ handler in userspace?
> > > If so, give up straight away. You handle IRQ in the kernel. Phil did it
> > > in a kernel module which is inserted into the kernel and runs in kernel
> > > "space".
> >
> > Yes, I suppose we were. We have given it up.
> >
> > > Try just commenting the include out and try recompiling. I've checked my
> > > source and it's commented out.
> >
> > Thanks, we commented the include out and we were able to generate adc.o.
> > However, when we use /sbin/insmod command, it complains about a mismatch in
> > kernel version:
> >
> > Using /root/adc.o
> > insmod: kernel-module version mismatch
> > /root/adc.o was compiled for kernel version 2.4.26
> > while this kernel is version 2.4.26-ts11.
> >
> > We downloaded the kernel source for version 2.4.26-ts11 and used it to
> > compile, but it's still giving us this error.
>
> If the error is exactly the same, then you did not properly point to the
> -ts11 kernel source when (re)-compiling adc.o. Make sure you are inserting
> the new module you just compiled, not the old one.
>
> >
> > Any suggestions?
> >
>
> Yes, take a look at:
> http://lwn.net/Kernel/LDD2/
>
> It helps a great deal when learning to develop linux kernel device drivers.
> There is a newer one (LDD3) that is for 2.6 kernels; LDD2 is for 2.4 kernels.
>
> > Thanks
> >
>
> regards, ......... Charlie
>
Hi again,
We were able to load the kernel module and use functions written in this module
for our program. However, we needed a sample rate of 1kHz, and we were having
trouble sampling at a constant frequency for any frequency above 1Hz.
We don't beleive there are any errors in our program, and in testing this we
tried to test Phil's kernel simply with the kernel comands he set up. We set
our desired sampling rate using a ECHO command that came with the module, and
the module, using a interrupt routine, wrote the sampled data to a dev/adc1.
Then we tried to read the sampled data using cat dev/adc1. The output displays
at a fast rate(as 1kHz should be), but pauses about every half a second, and
keeps going at the same paste.
We would like to know why this is happening, and how to use Phil's code to
achieve a constant 1kHz sampling rate.
Thanks
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