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Hi Olin,

Sorry English is not my first language apologize. First I want to attach
the scope shut then
I will continue later. What you mentioned is thats what I need. Read the
pulse then output in delayed. like you said we may not need CCP for it. In
order to control dwell time I also need to measure pulse width that was
main reason I started with CCP as capture but as far as outputing in
delayed is where I have a problem. I think using external timer is better
choice. did u get the attachment?

thanks

Andre


> andre@ditechnology.com wrote:
>> I have question that I am kind of stuck. friend of mine asked me to
>> make small board for his vw bug that has 1 input and 1 output. the
>> input takes pulse (4 pulse is 1 cycle) the frequency goes from hz to
>> khz at this
>> moment is unknown so the pic reads the pulse and output changes on
>> time only ( in this case called dwell control) but the frequency
>> input vs
>> output is same.
>
> Is english your first language?  Where are you located?  Your web site
> gives
> no hint of location.  The runon sentences make it difficult to decipher
> what
> you are trying to do.
>
> You want to pass a pulse train from input to output, except that the
> pulses
> need to be delayed by some previously known fixed amount?
>
>> attachment image is I am reading the pulse and the
>> output is same at this moment since things do not work for me at list
>> I outputted the same thing.
>
> There was no image attached, only a .c file.
>
>> does any
>> one feel like doing this project I prefer to use CCS C compiler if
>> you do not have it you can barrow mine until its done or if you guys
>> can give some direction I can continue working on it.
>
> Try to break up separate points into separate sentences.  The above
> contains
> one question and three separate points.  That's too many.
>
>> so far what I did is
>> I used pic capture input to capture how fast it runs that's using ccp
>> interrupt then in main loop i am trying to output same pulse but to be
>> able to change on time this is where I am not doing it right.
>
> More runon.  This is getting annoying.  Also remember to start each
> sentence
> with a upper case letter.  That's a simple rule anyone can follow, whether
> familiar with english or not.
>
> Why do you need a CCP module just to receive the pulses?  Do you also need
> to measure the pulse width?  Is the whole pulse to be delayed with width
> intact, or just the leading edge, or something else?
>
> How the dealay is done depends on how long and accurate it must be, and
> whether you must be able to receive a new pulse before outputting the
> previous one.  My first knee jerk reaction is to do the output delay in
> the
> interrupt routine, assuming you can ignore new pulses until sending out
> the
> previous one.  The nature of that delay timing will depend a lot on the
> delay time and accuracy requirements.  It could be a few inline
> instructions, to a timer, to letting the foreground code handle it.
>
> If outputting delayed versions of pulses is all the PIC is doing, then
> perhaps everything can be done in the foreground routine, or you can use
> the
> pulse input as a external GOTO 4 input.
>
> You need to give us real specs.
>
>
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