On a stock kernel, I don't think it would be possible to disable interrupts from user mode, but, with this kernel, it is set up to let you do a lot more, like mmap() even. What you need to do is look up the assembly instruction on arm for disabling interrupts, and then use in-line assembly from your C code.
However, you should only disable interrupts for a few microseconds typically, and I am not sure what it would do disabling them for seconds. It would obviously cause the kernel to miss clock ticks and the clock would be off, but not sure what else it would do.
I also need to disable interrupts as well for an application where I want to read two counters, one an internal free running counter, and another, and XDIO counter counting pulses on an external signal, so I can measure exact time between external counter readings. In my case however, it would be less than a microsecond or two that interrupts are disabled.
Well, if anybody has the assembly code to disable (and re-enable) interrupts, let us know.
On 10/22/06, mikedupuis2000 <> wrote:
nope...not joking...I am that stupid..teehee.
How do I write I kernal/module driver?
I designed a A/D card and I need to acquire data at about 1MByte/s. It
works perfectly up to 8 or 9 seconds but I need 25 seconds worth of
data. I have a 4K FIFO but it looks like I would need at least a 32K
FIFO...maybe more.
Are there other processes I can stop?
Thanks.
Mike
--- In ts-7000%40yahoogroups.com, Jim Jackson <> wrote:
>
>
>
>
> On Sun, 22 Oct 2006, Mike Dupuis wrote:
>
> > I am using a TS-7200. How do I disable the interrupts so my code does
> > not get interrupted. I am using GCC on Debian Linux. Usually I use
> > commands like "cli" and "sti" but these are not recognized when I
try to
> > compile my program.
>
> :-) you are joking aren't you?
>
> You can only do that sort of thing in the kernel.
> If your code really cannot be interrupted, then you should be writing a
> kernel module/driver for your specific purpose.
> Just out of curiosity, what is it you don't want interrupting?
>
> Jim
>
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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