Re: MPC555 Double Action Submodule help

Chris,

I've never measured a signal's period via MIOS pins, but if you got
the TPU UART function to work, why not leverage your TPU knowledge and
use another TPU channel and the PTA function. This function will
measure the high time, low time, or period of an input signal. You can
choose to do a measurement over N periods, from 1 to whatever, and you
can get an interrupt after those N periods have been measured.

Joe Pasquariello

--- In [email protected], "chriskoplan" <chriskoplan@y...> wrote:
>
> Thank you for all your previous help with regards to my TPU UART
> questions.  Unfortunately I find myself at another point where I am
> again stuck due to my extreamly limited knowledge of this processor
> and microcontrollers in general.  
> 
> I am trying to read in a square wave period measurement using the
> Double Action pins on the MPC555.  The wave is going to vary between
> 15khz and 30khz.  Anyway, I have tried many things to get a simpler
> program to read in any value but it doesn't seem to be working.  I
> tried to set the MDASM mode to IMP(Input Period Measurement) and then
> setup the MIOS clock correclty but I don't think I am diong it right.
> I was hoping I could either get some help with what I need to do to
> setup the Double Action pins correctly for reading this type of input
> or even some quick code of how you would setup this and read the pin.  
> 
> I am sorry for the really basic questions, hope it isn't a neusance.
> 
> Thanks again for your help,
> Chris Koplan
> Computer Engineering Student @ Cal Poly San Luis Obispo
>






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