Next hurdle. For some reason, the timer returns zero elapsed time, even with a deliberately inserted 4ms delay. Looking at the timer properties there is a 2MHz coount rate specified with no option to change it. Does FC, knowing the osc freq, insert a prescaler to get to 2MHz? My processor runs at 32...

Thanks Ben, that's a good tip.
At this moment I'm only looking at a rising edge, because I think that looking at rising edges only gives me an umambiguous pulse length.
Those NEC message designers were pretty smart!

Jan

If I look into the C file, I see: // Name: Interrupt, Type: Interrupt: Enable INT0 cr_bit(INTCON,INTEDG); INTPPS = 0x0A; st_bit(INTCON,GIE); st_bit(PIE0, INTE); This must be the section enabling the int and setting the edge direction. I can not find any definition of which port pin this INT0 is assi...

Quick update. The selection of interrupt pins for this device (PIC16F15355) is limited to portA and portB, although the other ports (C, D) also have this capability. Can live with that. I set up B2 as interrupt on falling edge, but for some reason that pin then gets configured as a low output. If I ...

Hmm. It seems an interrupt service routine can only be called from either a falling edge or a rising edge on a pin. For this setup, I need to service both a falling and a rising interrupt. The h/w of the PIC16F15355 can be set to interrupt on both a rising and a falling edge on a particular pin. Is ...

And for a lighter note:

Hmm. It seems an interrupt service routine can only be called from either a falling edge or a rising edge on a pin. For this setup, I need to service both a falling and a rising interrupt. The h/w of the PIC16F15355 can be set to interrupt on both a rising and a falling edge on a particular pin. Is ...

Yes, found it. I edited my msg above, seems to work in h/w.
Thanks for all your encouragement!

Jan

Martin, seems to work in h/w! Tried just a few numbers for ms delay, and they are correctly shown on the display. Funny enough, in simulation, as soon as I reset the counter in the flowchart, the counter in the 2D panel starts to count up to a value of around 3 (+/- 0.1). Ohh the intricacies of soft...

Yes - Int, my bad.
I'll see if I can whip something up on h/w tomorrow.
I also wasn't sure how to handle the fact that the timer read returns an Unsigned Integer, but with values this low, it should be OK to convert to Int for printing.

Jan