FREQOUT 4mhz

[mark_s]

I realized that after posting -- thanks. Will try that part you suggested. Can't believe something so simple has been such a headache.

Thanks.

It also helps to place a 1K resistor in parallel with the transducer when driving with a logic signal. Like the others said use HPWM. Sound and Freqout are blocking commands.

[Art]

You could eliminate any doubt with the pic by oscillating port b yourself,
and connecting an LED to any of the other port b pins, and changing the delay value.

buffer var byte = 0
TRISB = 0

cycle:

if buffer == $00 then
buffer = $FF
else
buffer = $00
endif
pauseus 1
PORTB = buffer

goto cycle