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Re: [ts-7000] Re: Hardware timers in user space, resolution?

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Subject: Re: [ts-7000] Re: Hardware timers in user space, resolution?
From: Jim Jackson <>
Date: Thu, 24 Sep 2009 22:56:54 +0100 (BST)


On Thu, 24 Sep 2009, Blair wrote:

> --- In  Jim Jackson <> wrote:
>>
>>
>>
>>
>> On Wed, 23 Sep 2009, Blair wrote:
>>
>>> Question: The T4 hardware timer can run at about 980kHz.  What's the
>>> fastest you can make use of it in a user space app?  I'd like to be able
>>> to do a periodic task every 125 microseconds or maybe half that.  Do I
>>> have to write a kernel driver to do this?
>>
>> This is an FAQ. Please try and search back in the group.
>>
>
> Got anything more definitive to go on?  I've bee searching hardware 
> timer, T4 timer, etc and all I seem to be able to find are comments like 
> "yeah you can do that" without the actual solution.  If this is a FAQ, 
> where is the FAQA (Frequently Asked Question Answer), or ATFAQ (not 
> related to AFLAC).  Source code would be useful.  I've tried the 
> T4timer.c code sample but what I'm seeing is the timeout if-then lines 
> overshooting the desired time by huge amounts.

How about the thread

  " T3 timer use on TS-7200"




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