Thanks for the info. I downloaded the driver code you referenced and it looks workable, but very incomplete. So next I downloaded the datasheet for the TDA9983. That's more along the lines of what I was expecting in the datasheet for the 19988. How close are the registers for the 9983 to the 19988? Are they a spot-on match? I know the rest of the information will be different, but the registers are all I care about at this point. I can figure the rest out once I have that part down.
On Sunday, January 19, 2014 9:40:19 AM UTC-5, Thomas Cort wrote: > > Hi, > > I was a Google Summer of Code student writing drivers for the Minix > operating system last summer. I was working on implementing EDID reading > (i.e. getting the supported resolutions, etc from the connected > display/monitor via the HDMI chip). I searched far and wide and there isn't > documentation with register definitions for the TDA19988. I sort of had to > piece things together using the datasheet for a similar chip (TDA9983B), > that pre-production draft of the TDA19988 datasheet (I think it's the one > you are referring to), some example code from NXP (Google search for > LPC4350_FPU_TFT_HDMI-v2.0.zip), and the Linux driver sources. I've > contacted the author of the Linux driver and various people at > BeagleBoard.org and that's the only documentation available. Well, there is > the Minix driver now but it only does EDID reading at the moment (no hdmi > output as there isn't a driver for the am335x lcd controller yet for Minix). > > As for initializing the chip. Yes, there are several commands you need to > send it via I2C to turn on the HDMI interface and configure the output. > > Thomas > > On Saturday, January 18, 2014 3:26:27 PM UTC-5, Travis Estep wrote: >> >> Hello! I've been hacking around with the BBB for some time now, mostly >> doing bare metal programming. On other boards that I build projects with, I >> usually use one of my TFTs that I have laying around and use my custom >> graphical interface for the UI part. But the BBB is different. While I have >> been able to use a TFT with it, I'd like to get the HDMI up and running on >> bare metal if possible. Looking over the datasheet for the TDA19988BHN I >> can see that basically it just takes the LCD RGB signals and concerts that >> to HDMI output. However, I have not had any luck with feeding it from the >> library I wrote for my TFT. Is there something different I need to do with >> the signals? Does the HDMI chip require some kind of initialization before >> being used? The datasheet I have is one that I found on some third party >> website and I suspect it may be incomplete. I can't find the official >> datasheet on NXP's website at all. >> >> Any help would be appreciated. Any advice for anyone else who has had >> success in this arena would also be much appreciated. Thanks in advance! >> >> -- 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/groups/opt_out.
