If you do it right, you should have nothing to do. But, be warned, the
expansion connectors are not what you call high speed. So it is possible
that your HDMI may not be able to get to the same resolution as the one on
the board.
Gerald
On Wed, Oct 8, 2014 at 2:00 PM, Bremenpl <breme...@gmail.com> wrote:
> I see now. Thank you a lot, i will take this under consideration when I
> get to the hdmi part in my board. I already aprichiate your help, but do
> you have any other tips that might help? Any software config problems you
> predict?
>
> Dnia 8 października 2014 20:54:39 Gerald Coley <ger...@beagleboard.org>
> napisał(a):
>
>> No there are not. That is why I am saying you need them on the expansion
>> board. The reason there is no buffer on the board is because it had to be
>> cheap and fit in an Altoids box. I could not do that and add the buffer,
>>
>> By buffers I mean like the one used on the LCD board.
>>
https://github.com/CircuitCo/BeagleBone-LCD7-RevA3/blob/master/BeagleBone-LCD7-RevA3-schematic.pdf?raw=true
>>
>>
>> Look at U1. Replace the VDD_LCD with 1.8V.
>>
>>
>> Gerald
>>
>>
>> On Wed, Oct 8, 2014 at 1:48 PM, Bremenpl <breme...@gmail.com> wrote:
>>
>>> I am only asking, no hard feelings :p. Ive just noticed that there
>>> were no buffers on the lcd lines between nxp and mcu on the bbb. Thats why
>>> I asked. Why are there no buffers on the bbb? By buffers do you mean that a
>>> voltage follower would do if the inputs are 3.3V tollerant?
>>>
>>> Dnia 8 października 2014 20:44:37 Gerald Coley <ger...@beagleboard.org>
>>> napisał(a):
>>>
>>>> It already is powered from 1.8V. The processor however, is powered from
>>>> 3.3V. The NXP part is 3.3V tolerant.
>>>>
>>>> You need the buffer to clean up the signals and provide better drive as
>>>> is being done on the LCD boards..
>>>>
>>>> I just designed the BeagleBone Black. You are designing your mother
>>>> board so do as you see fit.
>>>>
>>>> Gerald
>>>>
>>>>
>>>> On Wed, Oct 8, 2014 at 1:37 PM, Bremenpl <breme...@gmail.com> wrote:
>>>>
>>>>> Cant I just power the NXP from 1.8V? If the lines are 1.8V I would
>>>>> need no translation then. Also there are no buffer on the bbb itself
so why
>>>>> would I need such?
>>>>>
>>>>> Dnia 8 października 2014 20:12:06 Gerald Coley <ger...@beagleboard.org>
>>>>> napisał(a):
>>>>>
>>>>>> It is the low voltage level as these are 1.8V inputs. The issue is
>>>>>> making sure you get low enough, fast enough due to capacitance and
at the
>>>>>> correct frequency to yield a good data integrity. You can try using a
>>>>>> translator buffer from 3.3V to 1.8V. That should help.
>>>>>>
>>>>>>
>>>>>> Gerald
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 8, 2014 at 12:55 PM, Bremenpl <breme...@gmail.com> wrote:
>>>>>>
>>>>>>> I could do buffers as well, thats not a problem. I am building
>>>>>>> the board from scratch. Besides, arent the nxp input very high
impedance?
>>>>>>>
>>>>>>> Dnia 8 października 2014 19:52:48 Gerald Coley <
>>>>>>> ger...@beagleboard.org> napisał(a):
>>>>>>>
>>>>>>>> I am talking about you adding two NXP parts on those lines as you
>>>>>>>> indicated that you were doing. LCD cape uses buffers do boost the
signal.
>>>>>>>> The NXP pins are 1.8V inputs.
>>>>>>>>
>>>>>>>> Gerald
>>>>>>>>
>>>>>>>> On Wed, Oct 8, 2014 at 12:38 PM, Bremenpl <breme...@gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> There are resistors on the lines, worse case scenarion I can
>>>>>>>>> take them off. But tgose lines are used for lcd cape already so
it does
>>>>>>>>> work, whats the problem?
>>>>>>>>>
>>>>>>>>> Dnia 8 października 2014 19:06:54 Gerald Coley <
>>>>>>>>> ger...@beagleboard.org> napisał(a):
>>>>>>>>>
>>>>>>>>>> I doubt it will work but you are free to try. Adding two loads
>>>>>>>>>> such as that on those pins is asking for trouble.
>>>>>>>>>>
>>>>>>>>>> Gerald
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Oct 8, 2014 at 1:50 AM, bremenpl <breme...@gmail.com>
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hello there,
>>>>>>>>>>> I am currently working on a motherboard for the BeagleBone
>>>>>>>>>>> Black. One of the requiments is to have a HDMI output on the
side of the
>>>>>>>>>>> motherboard. I Know that there are LCD pins on the BeagleBone
Black header
>>>>>>>>>>> and there is a possibility to connect a LCD cape. I was
wondering either it
>>>>>>>>>>> would work to duplicate the NXP HDMI framer circuit that is on
the board to
>>>>>>>>>>> the motherboard and use it for hdmi output? If I am correct the
only
>>>>>>>>>>> difference would be that there is no acces to I2C0 from headers
so I would
>>>>>>>>>>> have to use I2C1/2 for the NXP chip. That way at least I wont
chave to
>>>>>>>>>>> worry about addressing 2 chips at once (not sure If you can
change address
>>>>>>>>>>> of the hdmi framer yet).
>>>>>>>>>>>
>>>>>>>>>>> My question is, would this solution be bard to implement in
>>>>>>>>>>> software, or is it easy to change the I2C bus config for hdmi?
Are there
>>>>>>>>>>> any obstacles that I am not aware of? I would really aprichiate
any help in
>>>>>>>>>>> here.
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>>>>>>> ---
>>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>>> Google Groups "BeagleBoard" group.
>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from
>>>>>>>>>>> it, send an email to beagleboard+unsubscr...@googlegroups.com.
>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>>>>>> ---
>>>>>>>>>> You received this message because you are subscribed to a topic
>>>>>>>>>> in the Google Groups "BeagleBoard" group.
>>>>>>>>>> To unsubscribe from this topic, visit
>>>>>>>>>>
https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe
>>>>>>>>>> .
>>>>>>>>>> To unsubscribe from this group and all its topics, send an email
>>>>>>>>>> to beagleboard+unsubscr...@googlegroups.com.
>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>>>>> ---
>>>>>>>>> You received this message because you are subscribed to the Google
>>>>>>>>> Groups "BeagleBoard" group.
>>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>>> send an email to beagleboard+unsubscr...@googlegroups.com.
>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>>>> ---
>>>>>>>> You received this message because you are subscribed to a topic in
>>>>>>>> the Google Groups "BeagleBoard" group.
>>>>>>>> To unsubscribe from this topic, visit
>>>>>>>> https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe
>>>>>>>> .
>>>>>>>> To unsubscribe from this group and all its topics, send an email to
>>>>>>>> beagleboard+unsubscr...@googlegroups.com.
>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>
>>>>>>> --
>>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>>> ---
>>>>>>> You received this message because you are subscribed to the Google
>>>>>>> Groups "BeagleBoard" group.
>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>> send an email to beagleboard+unsubscr...@googlegroups.com.
>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>
>>>>>>
>>>>>> --
>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>> ---
>>>>>> You received this message because you are subscribed to a topic in
>>>>>> the Google Groups "BeagleBoard" group.
>>>>>> To unsubscribe from this topic, visit
>>>>>> https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe
>>>>>> .
>>>>>> To unsubscribe from this group and all its topics, send an email to
>>>>>> beagleboard+unsubscr...@googlegroups.com.
>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>> --
>>>>> For more options, visit http://beagleboard.org/discuss
>>>>> ---
>>>>> You received this message because you are subscribed to the Google
>>>>> Groups "BeagleBoard" group.
>>>>> To unsubscribe from this group and stop receiving emails from it, send
>>>>> an email to beagleboard+unsubscr...@googlegroups.com.
>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>
>>>>
>>>> --
>>>> For more options, visit http://beagleboard.org/discuss
>>>> ---
>>>> You received this message because you are subscribed to a topic in the
>>>> Google Groups "BeagleBoard" group.
>>>> To unsubscribe from this topic, visit
>>>> https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe.
>>>> To unsubscribe from this group and all its topics, send an email to
>>>> beagleboard+unsubscr...@googlegroups.com.
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>> --
>>> For more options, visit http://beagleboard.org/discuss
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "BeagleBoard" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to beagleboard+unsubscr...@googlegroups.com.
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
>> ---
>> You received this message because you are subscribed to a topic in the
>> Google Groups "BeagleBoard" group.
>> To unsubscribe from this topic, visit
>> https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe.
>> To unsubscribe from this group and all its topics, send an email to
>> beagleboard+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/d/optout.
>>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to a topic in the
Google Groups "BeagleBoard" group.
To unsubscribe from this topic, visit
https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe.
To unsubscribe from this group and all its topics, send an email to
beagleboard+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
