Interrupt disable from within interrupt routine

[nazoa]

I have a simple interrupt service routine that collects data and stores it in buffer memory which is just an array variable. The main program then routinely checks to see if there is data in the buffer to be dealt with.

The problem I have is that occasionally the PIC will be too busy to check and deal with the data in the buffer before the buffer overflows. I have reached the limit of how much memory I can allocate to my buffer.

Is there a way I could disable the interrupt from within the interrupt service routine and re-enable when the data is dealt with by the main program? I think that the CCS compiler re-enables the interrupt at the end of the service routine so I need a way around this.

Any suggestions? Thanks.

[Ttelmah]

Just disable the individual interrupt.
The CCS compiler does not re-enable the interrupt at the end of the service routine.
The chip's own _hardware_, disables the 'global' enable, when the interrupt handler is called, and automatically re-enables this on exit (which combined with the need to avoid re-entrancy, is why you should never try to change the global enable inside an interrupt handler), but the individual enables are happily available to you.

Best Wishes

[RLScott]

[nazoa]

Thanks for the replies.

If I disable the interrupt the instrument sending out the data will hold fire - so no data is lost. This is OK as most of the time the PIC will be able to deal with the buffer data properly so the average throughput will be OK.

I will try disabling the individual interrupt and see if that works.

Thanks again.

[nazoa]

In case anyone is interested, disabling the individual interrupt within the interrupt routine worked fine. I just arranged for the main program to re-enable it once the buffer queue reduced below a certain level.

Thanks for the suggestions.