Request for GPIO Examples

[Ketul Shah]

Hi Punit,

Apart from what Worth Burruss suggested,

First of all setting on off timing and testing on LED would be OK for
primary testing.

You can always test your PWM signals on DSO/CRO to have a clear picture of
what is happening over signals.

And if you can manage to have second BBB you can test signals on it too:-
http://hackaday.com/2015/02/19/turn-your-beagleboneblack-in-to-a-14-channel-100msps-logic-analyzer/

Also thinking towards a bit application side,

Using PWM signals you can very DC motor speed using motor driver IC.
RGB Led would be a great visual to test it and many more....

Hope this helps for your further testing...

Ketul

On 23 March 2016 at 19:51, Worth Burruss <worth at motioncontrol.org> wrote:

> On 23 Mar 2016 at 0:57, punit vara wrote:
>
> > Hi Worth Burruss,
> >
> > This year I proposed a plan (https://goo.gl/cGCXbS) to develop Beagle
> > bone black BSP which includes PWM drivers as well as I2C driver. Could
> > you please suggest me testing methods to test PWM on BBB ?
> >
> > Regards,
> > Punit
> >
>
> Punit,
>
> I will preface this with my solutions tend to be overly complex and I do
> not know specifically
> what is available to use to test with in the BBB.  So this may not be what
> you are looking for.
> It also depends on the frequency of your PWM signals.
>
> When I think of test on hardware, I want to know it is working the way I
> think it is working
> (proving correctness).  For PWM, this means the duty cycle is correct.  I
> would be using
> another hardware counter timer to measure the High time followed by the
> Low time and doing
> the math to prove that the times are correct for the programmed duty cycle.
>
> As an alternate, with appropriate selection of PWM frequency and software
> timers, you can
> do the High and low counting using the timers.
>
> As for me, I would find it hard to see the change in an LED's intensity
> except in a crude
> fashion, so would not meet my personal goal of proving correctness.   But
> you may be
> thinking of ON and OFF times in seconds, In which case an LED and maybe a
> stop watch
> would be appropriate.
>
> Hopefully this gives you some ideas.
>
> Thank you,
>
> Worth Burruss
>
>
>
>
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