PIC16F616 HWPM Problem

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- 3rd April 2009, 22:31
Tobias

PIC16F616 HWPM Problem

I am using a PIC16F616. I can't get the HWPM to work. I threw in the Toggle command for a channel to check if the processor is operating. PortC.5 is going hi/lo.
Any ideas?

Code:

'**************************************************************** '* Name : UNTITLED.BAS * '* Author : [select VIEW...EDITOR OPTIONS] * '* Notice : Copyright (c) 2009 [select VIEW...EDITOR OPTIONS] * '* : All Rights Reserved * '* Date : 4/3/2009 * '* Version : 1.0 * '* Notes : * '* : * '**************************************************************** INCLUDE "modedefs.bas" OPTION_REG.7 = 0 'Pull Ups enabled TRISA.2=1 TRISC.0 = 1 TRISC.1 = 0 TRISC.2 = 0 TRISC.3 = 1 TRISC.4 = 0 TRISC.5 = 0 '0 Digital 1 Analogue ANSEL.7=0 ANSEL.6=0 ANSEL.5=0 ANSEL.4=1 ANSEL.3=0 ANSEL.2=0 ANSEL.1=0 ANSEL.0=0 ADCON0.7=1 'Right Justified ADCON0.6=0 ''Voltage reference is VDD ADCON0.5=0 'Turns on AN4 to analogue ADCON0.4=1 ADCON0.3=0 ADCON0.2=0 'HPWM DEFINES DEFINE CCP1_REG PORTC DEFINE CCP1_BIT 1 'Hpwm 2 --> portc.1 DEFINE CCP2_REG PORTC DEFINE CCP2_BIT 2 'Hpwm 1--> portc.2 Define ADC_BITS 8 ' Set number of bits in result Define ADC_CLOCK 3 ' Set clock source (3=rc) Define ADC_SAMPLEUS 50 ' Set sampling time in uSec Switch var PortA.2 ' FF var PortC.0 FrontOut var PortC.1 RearOut var PortC.2 GS var PortC.3 Watch var PortC.5 HPWM 1,127,400 HPWM 2,127,400 Loop: If Switch = 1 then Toggle Watch pause 100 endif goto Loop
- 3rd April 2009, 23:05
Darrel Taylor

Are you sure it's a PIC16F616?

The 616 only has 1 CCP module.
It's on RC5 and can't be changed with a DEFINE.
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- 4th April 2009, 04:18
Tobias

Come on isn't that just a minor technical difficulty??? I thought I was doing good reading the spec sheet. Table 2 has RC5 as CCP1, I thought that I could get away using RC2,3, and 4 because there was P1B, P1C, and P1D. What would I use RC2, 3, and 4 as if they are labeled as P1B, P1C, and P1D? Does that mean I can use them as HPWM's yet they will share the same pulse width as the CCP1? For my project I need two different PWM's so I would need a chip that has two CCP's?
Thanks
Toby
- 4th April 2009, 09:20
Darrel Taylor

Quote:

Originally Posted by Tobias

Come on isn't that just a minor technical difficulty???

Insignificant, in the scope of world events. :)<hr>
The CCP module on that chip is an ECCP.
The P1A thru P1D outputs can be used to run "half-bridge" or "full-bridge" motor drivers and a few other tricky things. All the outputs would have the same PWM freq/duty, but uses complimentary signals with programmable delays when switching states.

But the way the HPWM command uses the CCP module, it's a single output on the CCP pin.

You can only get 1 PWM signal out of it.

Quote:

For my project I need two different PWM's so I would need a chip that has two CCP's?

Depends on what you need. There are alternatives to HPWM.
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