Problem in Interrupt Handling ....

Problem in Interrupt Handling ....

[Etienne Lorrain]

> But after some period (may be after 2 –3
> hours) recv interrupts are not coming (all other type
> of interrupts are Ok ..),  If I reset the ISR0
> (interrupt status register which contains  recv
> interrupt) and enable ISR0, recv interrupts are
> coming.

 You have an higher priority interrupt pending on the
 "kind of" UART. Probably you have had two interrupts
 (TxReady and RxFull) on the same IRQ and you have treated
 only one of them, or you have forgotten to treat a modem
 interrupt or... Look at the UART interrupt priorities
 in your documentation.
 This is excluding the obvious case "two serial lines shares
 the same IRQ".

  Hope that helps,
  Etienne.

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Re: Problem in Interrupt Handling ....

[Alan Cox]

> serial communication adapter which is based on
> interrrupt driven IO, top half handles registering the
> Immediate task queue and  acknowledging to PIC, bottom
> half performs the actual task of interrupt handling. 

Why are you touching the PIC at all - the kernel handles the PIC for you.
Indeed you IRQ might not even be coming from a PIC

Problem in Interrupt Handling ....

[Venu Gopal Krishna Vemula]

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Hi,
         I am developing  a linux device driver for a 
serial communication adapter which is based on
interrrupt driven IO, top half handles registering the
Immediate task queue and  acknowledging to PIC, bottom
half performs the actual task of interrupt handling. 

         But after some period (may be after 2 –3
hours) recv interrupts are not coming (all other type
of interrupts are Ok ..),  If I reset the ISR0
(interrupt status register which contains  recv
interrupt) and enable ISR0, recv interrupts are
coming. 

I would appreciate if you can help solving this
problem.

regards,
Vvgkrishna_78@yahoo.com



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