adcin and HPWM

[lerameur]

I am looking at B.3 through my scope.
I am using the same hardware as my digital thermometer now, which was using B.3 to get the temperature and have a LCDout. (and that circuit is working fine, but no a/d or HPWM)
So I removed that wire on B.3 (of course) , placed the new chip in place and I am not seeing anything to the scope

k

[lerameur]

CCPMX_ON .... that should be off....

[lerameur]

I found a working program from steve in another thread:
@ DEVICE MCLR_ON, INTRC_OSC, WDT_ON, LVP_OFF, BOD_OFF, PWRT_ON, PROTECT_OFF, CCPMX_ON
OSCCON=$60 ' use internal 4MHZ osc
PAUSE 100 ' start-up delay
TRISB=0
DEFINE CCP1_REG PORTB
DEFINE CCP1_BIT 3
HPWM 1,128,1000
HERE: GOTO HERE

I just change the oscillation to 20Mhz, and it si not working: I think this is the problem..
I change the program to:

@ DEVICE MCLR_ON, HS_OSC, WDT_ON, LVP_OFF, BOD_OFF, PWRT_ON, PROTECT_OFF, CCPMX_ON
DEFINE OSC 20 'use external 20mhz crystal 'OSCCON=$60 ' use internal 4MHZ osc
PAUSE 100 ' start-up delay
TRISB=0
DEFINE CCP1_REG PORTB
DEFINE CCP1_BIT 3
HPWM 1,128,1000
HERE: GOTO HERE

[skimask]

CCPMX_ON .... that should be off....

That's one problem I'm thinking of. Not reading the right pin...

I found a working program from steve in another thread:

Look at your manual under HPWM. Can't do 1000 Hz at 20Mhz...

[lerameur]

19531Hz for a 20Mhz

I remember using 5Khz for one of my project for motor driver PWM.

How can I change steve's program to use a 20Mhz crystal?

[skimask]

19531Hz for a 20Mhz

I remember using 5Khz for one of my project for motor driver PWM.

How can I change steve's program to use a 20Mhz crystal?

The MINIMUM is 1221 hz, the max is 19531 hz. Can't do a lot about is, built into the hardware.
Steve has a program called MultiCalc. Check it out...

[lerameur]

well 10800hz fall well within those range , so no problem there.

k