Catching Interrupts

[Thomas Doerfler]

Hello Mark,

I don't know about the MIPS architecture, but I am 
quite sure you should NEVER call I/O functions from 
within an ISR.

wkr,
Thomas.


> I am attempting to write a response to an interrupt
> under RTEMS for the MIPS AU1100.  I must be missing
> something, though, as the handler is never called.  I
> register the handler as follows:
> 
>    rtems_isr_entry old_entry;
> 
>    rtems_status_code status;
> 
>    status =
> rtems_interrupt_catch(spi_isr,4,&old_entry); //4 is
> the SSI0 vector on the AU1100
> 
>    if (status != RTEMS_SUCCESSFUL) {
>       //handle error
>    }
> 
>    *(unsigned int*)(0xB16000008) = 0x00000002;
> //enable the “done” interrupt
>  
> 
> This routine returns an RTEMS_SUCCESSFUL.  The
> function is as below:
> 
> 
> rtems_isr spi_isr(rtems_vector_number vector) { 
> 
>    puts("spi_isr");
>    *(unsigned int*)(0xB16000004) = 0x0000000E; //clear
> interrupts
> }
> 
> This function is never called, even though polling the
> interrupt register shows that it should be.  Any
> ideas?
> 
> Thanks!
> 
> Mark
> 
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