Okay I think I see what you are saying. The MODE0 for GPIO3_21 is
"mcasp0_ahclkx", so with that beaglescript code, when I say
"b.pinmode("P9_25",b.output)" it is outputting the results of the MODE0
(clock generator output) and not the MODE7(GPIO output) as I had expected?
But if this were the case, in my Python ADAfruit code, I explicitly set
that pin to GPIO, so shouldn't behave like that?
Thanks for your help, really trying to get a solid grasp on these concepts!
-Joe
On Wednesday, July 8, 2015 at 10:14:00 PM UTC-4, Gerald wrote:
>
> Take a look at the schematic. GPIO3_21 is connected to the output of a
> clock generator. To use it you must disable the Oscillator.
>
> *Oscillator can be disabled via SW*
> *for power down modes or if*
> *GPIO3_21 needs to be used*
>
> My suggestion is to pick another pin to work with. Less headaches.
>
> Gerald
>
>
> On Wed, Jul 8, 2015 at 8:47 PM, <[email protected] <javascript:>> wrote:
>
>>
>> Hey all,
>>
>> I am pretty new to the BBB and I came across something pretty odd that I
>> have been trying to figure out for a few hours now as I was creating a push
>> button circuit:
>>
>> P9_25 is a GPIO pin. I set it to input but noticed that it would not
>> respond to my button. After some digging I realized that the pin itself
>> was acting funky, so I isolated it to run some tests with BB's Bonescript
>> tutorial on GPIO digitalWrite(). I ran this code below (apologies for the
>> sloppy picture) with the adjacent circuit configuration shown as well.
>> Obviously, the LED should turn off, but it doesn't:
>>
>>
>>
>> <https://lh3.googleusercontent.com/-UVZwTNBSR00/VZ3RjMNpQiI/AAAAAAAAAGM/mjWtyKl5LTw/s1600/20150708_212210.jpg>
>>
>> <https://lh3.googleusercontent.com/-lmn1_9_NGTM/VZ3PwVv6MLI/AAAAAAAAAF4/-yVeDLNf7fY/s1600/20150708_212158.jpg>
>>
>>
>> I then tried the same tests on other pins, such as P9_26, and it worked
>> perfectly, so that's where I'm startled.
>>
>>
>> I have two theories:
>>
>>
>> 1) I messed with P9_25 in the past, and it is reconfigured in a weird
>> way; if someone has this hunch, could you please perhaps inform me how to
>> reset the pin to its original glory?
>>
>>
>> 2) The pin is busted. Fingers crossed for #1.
>>
>>
>> If anybody has run into something similar, or has any idea what I should
>> do, please let me know!
>>
>>
>> Thank you for you time.
>>
>>
>> -Joe
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>
>
>
> --
> Gerald
>
> [email protected] <javascript:>
> http://beagleboard.org/
>
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