Yes. There are a certain amount of pins on the expansion headers. Each pin has up to 8 functions per pin. For each pin that is set to the HDMI function, the other 7 functions are no longer available to the expansion header when the HDMI is in use. Some of these functions are some of the more popular functions. So, we went 16bit so those other function could be there for people to use and still have HDMI capabilities.
Gerald On Tue, Nov 12, 2013 at 3:03 PM, <[email protected]> wrote: > Higher color output through the HDMI connector uses up pins? > > > On Tuesday, November 12, 2013 12:14:46 PM UTC-5, Gerald wrote: > >> We did this for a reason. Our focus was expansion and due to the pin >> muxing, the extra 8 bits would wipe out a lot of functionality. Se we >> decided to make those easily accessible when connected to a monitor. >> >> Gerald >> >> >> On Tue, Nov 12, 2013 at 10:27 AM, <[email protected]> wrote: >> >>> Thanks Gerald, >>> >>> I will have to confirm this by wiring up another LCD panel to the >>> expansion headers. It's unfortunate to learn that there is a 16-bit color >>> limitation via HDMI output. On the Raspberry Pi I can issue the "fbset >>> -depth 24" bash command and the HDMI output switches to 24-bit color depth. >>> When I try that command on the BBB it returns with the error "ioctl >>> FBIOPUT_VSCREENINFO: Invalid argument". Only 8 and 16 work as valid bit >>> depths with the BBB. >>> >>> >>> On Tuesday, November 12, 2013 9:41:30 AM UTC-5, Gerald wrote: >>> >>>> All 24 bits are available on the expansion headers. I cannot speak for >>>> 4D systems as to how their board is designed and if they support 24b mode >>>> or not. >>>> >>>> HDMI only has 16 bits connected, so you cannot get 24b color on it. >>>> >>>> Gerald >>>> >>>> >>>> >>>> On Tue, Nov 12, 2013 at 8:37 AM, <[email protected]> wrote: >>>> >>>>> I'd like to refine my question to you Gerald... >>>>> >>>>> How can I get 24-bit color with the BBB via either HDMI or LCD >>>>> (assuming the LCD I wire up is a 24/32-bit color panel)? I thought the TI >>>>> spec indicated the BBB could drive true-color but all I can manage to get >>>>> out of the BBB is 16-bit color regardless if I use HDMI or the LCD from 4D >>>>> Systems. >>>>> >>>>> >>>>> On Monday, November 11, 2013 2:26:02 PM UTC-5, [email protected]: >>>>>> >>>>>> Great, now how does one specify a particular resolution and audio >>>>>> option upon startup? >>>>>> >>>>>> On Saturday, November 2, 2013 4:32:32 PM UTC-4, Gerald wrote: >>>>>>> >>>>>>> 1920x1080@24HZ is the best it can do. >>>>>>> >>>>>>> Gerald >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Sat, Nov 2, 2013 at 1:19 PM, <[email protected]> wrote: >>>>>>> >>>>>>>> Per above, it seemed that 1920x1080 was possible in the 50-60Hz >>>>>>>> range without audio. Has the community been able to figure out a way >>>>>>>> to >>>>>>>> get that to work? >>>>>>>> Thanks! >>>>>>>> >>>>>>>> >>>>>>>> On Friday, November 1, 2013 3:24:35 AM UTC-4, [email protected]: >>>>>>>>> >>>>>>>>> People, read your docs… According to the latest System Reference >>>>>>>>> Manual, BBB added support for 1920x1080@24Hz resolution: >>>>>>>>> https://github.com/CircuitCo/BeagleBone-Black/tr >>>>>>>>> ee/master/BBB_SRM.pdf<https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&ved=0CFwQFjAD&url=https%3A%2F%2Fgithub.com%2FCircuitCo%2FBeagleBone-Black%2Fblob%2Fmaster%2FBBB_SRM.pdf%3Fraw%3Dtrue&ei=NVVzUrLINaO62AWi9oCgBA&usg=AFQjCNGHgKSW6eN6wCnTOUguqfvWLjtP8Q&sig2=b12eANaFMCe-U0hiVGZLpw&bvm=bv.55819444,d.b2I> >>>>>>>>> >>>>>>>>> >>>>>>>>> 6.10 HDMI Interface >>>>>>>>> >>>>>>>>> The BeagleBone Black has an onboard HDMI framer that converts the >>>>>>>>> LCD signals and audio signals to drive a HDMI monitor. The design >>>>>>>>> uses an >>>>>>>>> NXP TDA19988 HDMI Framer. >>>>>>>>> >>>>>>>>> The following sections provide more detail into the design of this >>>>>>>>> interface. >>>>>>>>> >>>>>>>>> 6.10.1 Supported Resolutions >>>>>>>>> >>>>>>>>> The maximum resolution supported by the BeagleBone Black is >>>>>>>>> 1280x1024 @ 60Hz. Table 9 below shows the supported resolutions. >>>>>>>>> Not all resolutions may work on all monitors, but these have been >>>>>>>>> tested >>>>>>>>> and shown to work on at least one monitor. EDID is supported on the >>>>>>>>> BeagleBone Black. Based on the EDID reading from the connected >>>>>>>>> monitor, the >>>>>>>>> highest compatible resolution is selected. >>>>>>>>> >>>>>>>>> Table 9. HDMI Supported Monitor Resolutions >>>>>>>>> [image: page71image9400] [image: page71image9824] [image: >>>>>>>>> page71image10248] [image: page71image11640] >>>>>>>>> >>>>>>>>> RESOLUTION >>>>>>>>> [image: page71image12800] [image: page71image13416] [image: >>>>>>>>> page71image13576] >>>>>>>>> >>>>>>>>> AUDIO >>>>>>>>> [image: page71image14600] [image: page71image14760] [image: >>>>>>>>> page71image15352] [image: page71image15920] [image: >>>>>>>>> page71image16344] >>>>>>>>> >>>>>>>>> 800 x 600 @60Hz >>>>>>>>> >>>>>>>>> 800 x 600 @56Hz >>>>>>>>> [image: page71image20208] >>>>>>>>> >>>>>>>>> 640 x 480 @75Hz >>>>>>>>> [image: page71image23392] [image: page71image24296] >>>>>>>>> >>>>>>>>> 640 x 480 @60Hz >>>>>>>>> >>>>>>>>> YES >>>>>>>>> >>>>>>>>> 720 x 400 @70Hz >>>>>>>>> [image: page71image29160] >>>>>>>>> >>>>>>>>> 1280 x 1024 @75Hz >>>>>>>>> [image: page71image32416] [image: page71image33184] >>>>>>>>> >>>>>>>>> 1024 x 768 @75Hz >>>>>>>>> [image: page71image35248] [image: page71image36016] >>>>>>>>> >>>>>>>>> 1024 x 768 @70Hz >>>>>>>>> [image: page71image38080] [image: page71image38848] >>>>>>>>> >>>>>>>>> 1024 x 768 @60Hz >>>>>>>>> [image: page71image41264] [image: page71image41744] [image: >>>>>>>>> page71image42632] >>>>>>>>> >>>>>>>>> 800 x 600 @75Hz >>>>>>>>> [image: page71image44912] >>>>>>>>> >>>>>>>>> 800 x 600 @72Hz >>>>>>>>> >>>>>>>>> 720 x 480 @60Hz >>>>>>>>> >>>>>>>>> YES >>>>>>>>> >>>>>>>>> 1280 x 720 @60Hz >>>>>>>>> >>>>>>>>> YES >>>>>>>>> [image: page71image53920] >>>>>>>>> >>>>>>>>> 1920x1080@24Hz >>>>>>>>> >>>>>>>>> YES >>>>>>>>> [image: page71image57840] [image: page71image58304] [image: >>>>>>>>> page71image58784] >>>>>>>>> >>>>>>>>> *NOTE: The updated software image used on the Rev A5B board added >>>>>>>>> support for 1920x1080@24HZ.* >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Wednesday, 8 May 2013 03:05:24 UTC-7, [email protected]: >>>>>>>>>> >>>>>>>>>> The Beagle Board Black system reference manual rev A5.2 says (in >>>>>>>>>> the HDMI section): >>>>>>>>>> >>>>>>>>>> Currently the following resolutions are supported via the >>>>>>>>>> software: >>>>>>>>>> 1280 x 1024 >>>>>>>>>> 1440 x 900 >>>>>>>>>> 1024 x 768 >>>>>>>>>> 1280 x 720 >>>>>>>>>> >>>>>>>>>> This is a bit disappointing because we don't have 1920 x 1080... >>>>>>>>>> arguable "full HD". I believe the current Raspberry Pie has more >>>>>>>>>> than 1920 >>>>>>>>>> x 1080. >>>>>>>>>> Is this limit imposed by the hardware of the software? Are we >>>>>>>>>> expecting higher resolutions in future software releases? >>>>>>>>>> >>>>>>>>>> Thnaks >>>>>>>>>> >>>>>>>>>> Richard. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>> 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]. >>>>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>>>> >>>>>>> >>>>>>> -- >>>>> 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]. >>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>> >>>> >>>> -- >>> 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]. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> -- > 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]. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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]. For more options, visit https://groups.google.com/groups/opt_out.
