adcin and HPWM

[lerameur]

I tried the following program, very simple, still not getting anything out..
using internal osc, trying to cut down on the hardware...



'Test HPWM command
'
INCLUDE "modedefs.bas" 'Includes supoprt for PicBasic language
@ DEVICE pic16F88, CCPMX_ON, INTRC_OSC_NOCLKOUT

OSCCON = %110 ' Set OSC TO 4MHZ 'select the clock


'DEFINE OSC 20 'use external 20mhz crystal
PAUSE 100 ' start-up delay

'/////////////////////////
'// PIN configuration //
'/////////////////////////

DEFINE CCP1_REG PORTB 'Define output port of pulses out
DEFINE CCP1_BIT 3 'Define output port of pulses out

CMCON = 7 ' Disable analog comparator

TRISB = %00000000 ' Set PORTB to all output
TRISA = %11111111 ' Set PORTA to all input

'///////////////////////////////////////////////
'// Variable Declaration and initialization //
'///////////////////////////////////////////////

'//////////////////////////
'// Program starts here //
'//////////////////////////
HPWM 1,126,3000
PAUSE 200 ' delay

Mainloop:

GOTO Mainloop
end

[skimask]

I tried the following program, very simple, still not getting anything out..
using internal osc, trying to cut down on the hardware...

Which pin on the PIC are you looking at? And how are you looking at it?

[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?