very good idea thanks. the only part I am not clear is the timers as soon a=
s activated it will run and overflow so
I have to keep it off until uart ISR will enable as soon as data comes in.

ISR:
1.clear timer =A0to start from 0
2.enable timer
3.RX uart got the data
4.clear timer again once byte received


then function to process the UART data
1. check for timer flag? if overflow=A0
2. disable timer
3. end

the way I see it if I do not disable the timer it will overflow without rec=
eiving any data

does it look correct?


thanks



On Sunday, February 2, 2014 10:58 AM, Wouter van Ooijen <wouter@voti.nl> wr=
ote:
=20
Dwayne Reid schreef op 02-Feb-14 7:12 PM:
> Generally, I reset a timer every time a new byte comes in. When the
> timer expires, I consider that to be the end of the packet.
>
> That works pretty well for me but in my case, the bytes are fairly
> close to each other, and the time between packets is much longer than
> one byte time.=A0 This doesn't work if the packets are really close toget=
her.
>
>

And you'll get in trouble when an usb-to-serial converter is used.

Wouter

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