You want to time the pulse width or count the number per second?
Depending on the speed and resolution you can either set up a periodic
Timer and sample the input -- the minimum Timer is somewhere between
1 and 3 milli-sec; or you can use the Capture features of the ATMEGA
to get micro-second resolution in hardware.
I have some code for the Capture hardware under T1 at:
http://www.etantdonnes.com/Motes/AVR128timers.zip
but if you are inexperience with TOS and microcontrollers you
may be at a loss to use it...
For some reason none of this is directly supported under TOS.
In all cases the advised approach is to read through the doc/tutorial
to get some experience with TOS and then start trying to decipher
the controller manual.
MS
Giuseppe Aiello wrote:
> Hi, I really need help with this. I have to read a pulse signal from an
> encoder. I'm using an ATmel128 microcontroller with Tinyos 2.1. I've
> read some post where it is said that it is possible to do this by using
> the principle of edge detection. I'm trying to adapt the application
> TestUserButton to my needs, but for me this is a difficult task because
> I don't have a lot of experience with tinyos and this program is
> intended for another platform. Any help with this will be greatly
> appreciated.
> Thanks
>
>
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