Select case function

[jackberg1]

Hello Richard

by inverting portb / portc I found no duplicate

If I may ask, how to know the time it took from the start to end of a for/next loop or select case in a program


Many thanks for your support.

      key = ncd portb  'row    look for a 1
      key = key + (ncd portc )<<4

[HenrikOlsson]

If I may ask, how to know the time it took from the start to end of a for/next loop or select case in a program

Depends on what's available. I usually just set a pin high at the start and low again at the end of the routine I want to measure and then look at the pin using a scope or logic analyzer. Another option is to use one of the hardware timers and send the result to the PC using whatever serial connection is available (DEBUG, SEROUT, HSEROUT) but for longer routines one has to be little bit careful as to not overflow the timer and therefor get misleading values.

/Henrik.

[jackberg1]

Thank you HenrikOlsson

This is a very usefull solution since I got on hand a logic analyzer + scope.

[jackberg1]

Hello HenrikOlsson,

I did some timing test for the 'Select case' for key # 1 ~ key # 64

case # 1 : 3.48us and the last of the case key # 64 : 134.9us

Thanks again for this clever trick.