Hello Surya,
the printer port interrupt also serves to catch spurious
interrupts, this means pulses on ANY interrupt line,
which are so short, that the channel they have actually
appeared on can not be detected by the interrupt controller.
You should place code to check whether there actually is
an interrupt from the printer port, and silently exit
the service routine otherwise.
I have not studied your code, but hope this helps
anyway.
Best regards,
Thomas Wuensche
Surya P Kommareddy wrote:
>
> Hi all,
> Merry Christmas and a happy new year.
> I have been trying to write an Interrupt handler, for the parallel
> port. Attached are the files for the module. Even though I don't give any
> interrupt signal(tenth pin of the port) on the parallel port, the
> interrupt handler gets activated. Am I doing something wrong?? I am using
> RTlinux2.0 on Redhat6.1 with 2.2.13 kernel.
>
> Thanks in anticipation,
> Surya.
>
> ------------------------------------------------------------------------
> Name: common.h
> common.h Type: Plain Text (TEXT/PLAIN)
> Encoding: BASE64
> Description: common.h
>
> Name: rt_process.c
> rt_process.c Type: Plain Text (TEXT/PLAIN)
> Encoding: BASE64
> Description: rt_process.c
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