Lpc2000

>  I am assuming that this is also using a serial polling routine and
> with numbers and space that you are sending out at 9600 baud (1ms per
> character) you take about 11ms per string. Change it to an interrupt
> type so you do not have to wait for the Txd. An alternative is to
> boost the baud rate to like 57.6K or even 115.2K.
> 
> You should also change the capture to an interrupt to collect the time
> and save it into a simple stack in case you get locked up waiting for
> communications if you need to keep the baud rate at 9600.

Indeed.  I didn't look at that while loop, that's not so good.

Be sure to check the errata sheet when implementing interrupt capture code.

Joel