PWM problem with PIC16F777

Would really appreciate some help on getting the 3rd PWM to work on my PIC16F777.

I'm using the three PWM's to control R G B led strips. My PortB.5 will not light!

The code I'm using - primarily from this forum is below. I know that the circuit is fine, as all three colours work when I manually switch the pins high and low.

I've stripped the code down - for simplicity - to just flash through the three colours... but alas only ever get two!

Code:

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'-- Setup ---------------------------------------------------------------------
@ DEVICE PIC16F777, INTRC_OSC_NOCLKOUT

DEFINE  OSC 8

OSCCON = %01110010 'see data sheet for INTRC speed setting

' Word vars for 10-bit value of each PWM duty cycle
DutyR VAR WORD ' Channel #1
DutyG VAR WORD ' #2
DutyB VAR WORD ' #3

' Set CCPx pins to outputs
TRISC.2=0 ' CCP1 output
TRISC.1=0 ' CCP2 output (could also be assigned to RB3)
TRISB.5=0 ' CCP3 output

' Set CCP modules to PWM mode
CCP1CON = %00001100 ' Mode select = PWM
CCP2CON = %00001100 ' Mode select = PWM
CCP3CON = %00001100 ' Mode select = PWM

' Set period up for 1.22kHz PWM freq
PR2 = $FF

' Set TMR2 up for 1:16 prescale & turn it on
T2CON = %00000110 ' TMR2 ON 1:16 prescale


'-- Program ---------------------------------------------------------------------
MainRoutine:

dutyR = 719
dutyg = 0
dutyb = 0
gosub colourset
PAUSE 1000

dutyR = 0
dutyg = 719
dutyb = 0
gosub colourset
PAUSE 1000
 
dutyR = 0
dutyg = 0
dutyb = 719
gosub colourset
PAUSE 1000

goto MainRoutine

'-------------------------------------------------------------------------------

colourset:
CCP1CON.4 = Dutyr.0 ' Setup 10-bit duty cycle as
CCP1CON.5 = Dutyr.1 ' a 10-bit word
CCPR1L = Dutyr >> 2
             
CCP2CON.4 = Dutyg.0
CCP2CON.5 = Dutyg.1
CCPR2L = Dutyg >> 2
       
CCP3CON.4 = Dutyb.0
CCP3CON.5 = Dutyb.1
CCPR3L = Dutyb >> 2
return

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Many thanks in advance,
orjon.

Rule #1: Always check the pinout.

http://circuits.datasheetdir.com/19/...777-pinout.jpg

What's on PORTB.5?
Yeah right AN13... Now check the datasheet page 155 (ADCON1 register) to see how to disable the ADC on this pin.

Hi Steve,

Thank you for the prompt reply.

I've been looking through the datasheet in the A/D section, but it's quite over my head! I have done some searches and see that setting the ADCON1 to %00000001 for instance would set AN0 to A/D. But see not reference to AN13 (portb.5) in the table...

Another clue ... please?!

ADCON1 = 15 ' All I/O pins digital

Thanks!

Phew - that wasn't fun...

It is possible to set them individually?

Thank you both very much - you have just completed the spectrum for me!

Yes, goto the table Steve mentioned and take a look.
1111 = 15
:D

Ahhh... Sorry guys - I was looking at Page 155 (as per page number at bottom) and beyond - not Page 155 of the PDF! So I started (struggling) to read through missing the two pages before!

....This table looks much more understandable than Table 12-2 which I eventually go to on page 160 (162 of pdf)

Thanks again.

hey.... i am working on application note AN889...... open loop v/f control of pic16f777....... getting error as follows.......... ' Error - section '.udata_shr' can not fit the section. Section '.udata_shr' length=0x00000010' plz some one help with this error....Thanks

Quote:

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Originally Posted by oswalam

hey.... i am working on application note AN889...... open loop v/f control of pic16f777....... getting error as follows.......... ' Error - section '.udata_shr' can not fit the section. Section '.udata_shr' length=0x00000010' plz some one help with this error....Thanks

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looks you are asking questions about Microchip assembler aboard a Picbasic pro forum ...
sorry but you've hit the wrong door ...

Alain