Re: [ts-7000] T3 and T4 timers - What are they?

[Jim Jackson <>]

On Wed, 9 May 2012, burnsmicro wrote:

> In the absence of a Periodic Timer interrupt, I need something to take 
> the place of a pit_isr() to periodically trigger the execution of a short 
> function at a frequency of between 50 and 100 Hz. Thge actual frequency 
> is not so important as the accuracy of the frequence. Even that could be 
> adjusted against the date/time.
> 
> There are lots of posts on the ts-7000 list relating to fine grain timing 
> issues. There are several mentions of T3 and T4 timers and in one of 
> them, Jim Jackson mentions "Phil's driver can sample at 8KHz, and it is 
> good enough for sound sampling".
> 
> Can anyone point me to what a T3 and a T4 timer is? There is a file, 
> T4ticks.c, in the Files section of this List, which appears to exercise 
> the T4 timer, but it assumes knowledge of the T4 timer or a tremendous 
> act of faith.

It is one of the hardware timers in the chip - assuming you are talking 
about one of the EP9301/2 based boards (72xx). The details for programming 
the timers are in the EP9301/2 user's guide. 




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