Hello there again Gerald, I was trying to get a piece of TDA19988 chip but he is not avaible in a single distributor :|. I was trying to find some simmilar chips from other distributors but I am not sure either they would be compatible. Would you mind helping me out in this case?
W dniu środa, 8 października 2014 21:03:58 UTC+2 użytkownik Gerald napisał: > > 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 <[email protected] <javascript:>> > 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 <[email protected] >> <javascript:>> 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 <[email protected] >>> <javascript:>> 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 <[email protected] >>>> <javascript:>> 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 <[email protected] >>>>> <javascript:>> 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 < >>>>>> [email protected] <javascript:>> 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 <[email protected] >>>>>>> <javascript:>> 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 < >>>>>>>> [email protected] <javascript:>> 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 <[email protected] >>>>>>>>> <javascript:>> 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 < >>>>>>>>>> [email protected] <javascript:>> 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 <[email protected] >>>>>>>>>>> <javascript:>> 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 [email protected] >>>>>>>>>>>> <javascript:>. >>>>>>>>>>>> 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 [email protected] <javascript:>. >>>>>>>>>>> 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 [email protected] <javascript:>. >>>>>>>>>> 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 [email protected] <javascript:>. >>>>>>>>> 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 [email protected] <javascript:>. >>>>>>>> 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 >>>>>>> [email protected] <javascript:>. >>>>>>> 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 [email protected] <javascript:>. >>>>>> 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 >>>>> [email protected] <javascript:>. >>>>> 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 [email protected] <javascript:>. >>>> 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 >>> [email protected] <javascript:>. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this 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