touble with a time calculation

[richard]

won't work . the isr can change the values as u copy them to the temp vars ,been there done that

[EarlyBird2]

Ok some problems do not have an answer.

Bye

[richard]

only solution I know is to disable isr and copy vars to a buffer then enable isr and then perform calcs on the buffered data.
it may mean the odd lost interrupt / whats worse incorrect calcs or missed ints
only the designer can make that call .