Rough 'n Ready Audio Frequency extraction with a PIC

[HankMcSpank]

Thanks Darrel....I'll check it out later.

So here's the ludicrously simple 'get me up & running' setup I have (lifted/edited fromthe Microchip Tips' n trick sheet)



I put a sawtooth from a sig gen on the comparator input, but get nowt on the output

Now like I say, I always struggle with the registers - and even then, it's been a while - so try not to laugh...

@MyConfig = _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON  
@MyConfig = MyConfig & _MCLRE_OFF 

DEFINE OSC 4           ' Internal 4MHz

CMCON0 = %00000001   	'CIN pins are configured as analog, COUT pin configured as Comparator output?
ADCON0 = %00000000	'ADC disabled?
ANSEL = %00001111	'All Analogue inputs enabled?
TRISIO = %111011	'GPIO2 output (Comparator Out)

' PIN# NAME     USE & CONNECTION
'  1   Vdd      +5VDC power supply
'  2   GPIO.5   Debug Port (PicKit2 needs switching from here to pin Pin 7 to allow programming)
'  3   GPIO.4   
'  4   GPIO.3   
'  5   GPIO.2   Comparator Out (GP2)
'  6   GPIO.1   CIN-  Signal In  (GP1)
'  7   GPIO.0   CIN+  trigger level (GP0)
'  8   Vss      Power supply ground
'-------------------------------------------------------------------------

EDIT Ok, spotted it..

ANSEL = %00001011		'All Analogue inputs except AN2 enabled

& here we have an output...



Now...what to do with the output?!!!