PWMx8 object

Jonathan

Hi All,

I am having trouble getting the PWMx8 object to work on pin 13. It seems to have something to do with which pin I am trying to use. If I set the base_pin to 0, I can get PWM out of any pin 0-7. However, if I try to set the based_pin to 8 and get PWM out of 8-15, no joy. Here is the snip. It works fine 0-7, but nothing out of 8-15. The pins are all fine, I can manually twiddle them. The snip below should PWM all of the pins in the bank. For just pin 13 the pin select byte would be %0010_0000

CON
    _clkmode = xtal1 + pll16x
    _xinfreq = 5_000_000

  base_pin      = 8
   
VAR

byte duty

OBJ

pwm             : "PWMx8"

PUB init
    freq := 300
    duty := 128
    pwm.start(base_pin, %1111_1111,freq)
    pwm.duty(base_pin,duty)
    repeat

Any ideas what I am doing wrong?

Jonathan

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virtuPIC

Is any other cog running other software that could interfere with pin 13?

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Jonathan

Nope, the is the code, the whole code, and nothing but the code. Oh, except that I forgot to declare freq as a long above, which it is in the real code. I just triple checked.

Thanks!

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Phil Pilgrim (PhiPi)

Jonathan,

Are you using version 1.1 (17 Jul 08) of pwmx8? It fixed some issues related to base pins > 0. The demo program that comes with it uses a base pin of 16.

-Phil

Jonathan

Phil,

Yes, I am using the latest version. I went ahead and DL'd again just in case, but no luck.

Can anyone try out the code above to make sure it is something I am doing?

Thanks!

Jonathan

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shanghai_fool

Jonathan said...
Hi All,

I am having trouble getting the PWMx8 object to work on pin 13. It seems to have something to do with which pin I am trying to use. If I set the base_pin to 0, I can get PWM out of any pin 0-7. However, if I try to set the based_pin to 8 and get PWM out of 8-15, no joy. Here is the snip. It works fine 0-7, but nothing out of 8-15. The pins are all fine, I can manually twiddle them. The snip below should PWM all of the pins in the bank. For just pin 13 the pin select byte would be %0010_0000

You are only assigning duty cycle to 1 pin. It worked using these mods

CON
    _clkmode = xtal1 + pll16x
    _xinfreq = 5_000_000
  base_pin      = 8
   
VAR
byte duty
long    freq
OBJ
pwm             : "PWMx8"   
PUB init  | i
    freq := 300
    duty := 128
    pwm.start(base_pin, %1111_1111,freq)
    repeat i from 0 to 7
      pwm.duty(base_pin + i,duty)
    repeat

Jonathan

Shanghai,

Bingo! Thanks for the help! Much appreciated. Now I can dim the nixie tubes in my clock. [noparse]:)[/noparse]

Jonathan

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