How do I......

Paul M

Some pseudo code:

.
.
repeat
  .
  .  'do stuff
  .
  if <somecondition>
    now:=cnt
  .
  . 'do more stuff
  .
  if cnt > now + 5*80_000_000
    ' 5 seconds should have elapsed since <somecondition>
  .
  .   

This doesn't work properly presumably due to the signed arithmetic(??)

How do you do this?

Mike Green

It works much better to do

if cnt - now > 5*80_000_000

It's also more reliable to do

if cnt - now > 5 * clkfreq

You may not always run your program with a 80MHz clock.

Paul M

Thanks Mike,

After reading your reply I realised that·I had used the difference method elsewhere in my code to get·'time between events'.

You say "..works better.." but actually you mean works always.

and yes, I neglected to note in my pseudo code .. "assuming an 80MHz clock.."

Thanks again