Re: [riot-devel] Stop other thread

[Kaspar Schleiser]

Hey,

On 07/13/2016 01:32 PM, Baptiste Clenet wrote:
> I've got a chip which needs precise timing to be read. A year ago, I
> was able to communicate with this chip but now, even if I go as fast I
> can it seems that timing have increased with same source code.
> So is there a way to force the CPU to do only one task at the time for
> the duration of the function. Can we tell the scheduler to stop other thread?

two things might interrupt:

1. a thread with higher priority

This can be solved by increasing the priority of the thread talking to
your code, possibly to the maximum.
(beware: lower priority value means higher priority)

2. interrupts

If an interrupt messes with your timing, that can be prevented by
disabling interrupts for a time-critical section:

unsigned state = irq_disable()
/* timing critical code */
irq_restore(state);

Kaspar


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Re: [riot-devel] Stop other thread

[Baptiste Clenet]

Should I simply run a thread with highest priority so I'm sure it will
be run before running other thread?

2016-07-13 13:32 GMT+02:00 Baptiste Clenet :
> Hi,
>
> I've got a chip which needs precise timing to be read. A year ago, I
> was able to communicate with this chip but now, even if I go as fast I
> can it seems that timing have increased with same source code.
> So is there a way to force the CPU to do only one task at the time for
> the duration of the function. Can we tell the scheduler to stop other thread?
>
> Cheers,
>
> 2016-07-13 13:32 GMT+02:00 Baptiste Clenet :
>> Hi,
>>
>> I've got a chip which needs precise timing to be read. A year ago, I
>> was able to communicate with this chip but now, even if I go as fast I
>> can it seems that timing have increased with same source code.
>> So is there a way to force the CPU to do only one task at the time for
>> the duration of the function. Ca
>>
>> --
>> Baptiste
>
>
>
> --
> Baptiste



-- 
Baptiste
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Re: [riot-devel] Stop other thread

[Baptiste Clenet]

Hi,

I've got a chip which needs precise timing to be read. A year ago, I
was able to communicate with this chip but now, even if I go as fast I
can it seems that timing have increased with same source code.
So is there a way to force the CPU to do only one task at the time for
the duration of the function. Can we tell the scheduler to stop other thread?

Cheers,

2016-07-13 13:32 GMT+02:00 Baptiste Clenet :
> Hi,
>
> I've got a chip which needs precise timing to be read. A year ago, I
> was able to communicate with this chip but now, even if I go as fast I
> can it seems that timing have increased with same source code.
> So is there a way to force the CPU to do only one task at the time for
> the duration of the function. Ca
>
> --
> Baptiste



-- 
Baptiste
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[riot-devel] Stop other thread

[Baptiste Clenet]

Hi,

I've got a chip which needs precise timing to be read. A year ago, I
was able to communicate with this chip but now, even if I go as fast I
can it seems that timing have increased with same source code.
So is there a way to force the CPU to do only one task at the time for
the duration of the function. Ca

-- 
Baptiste
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