> How close are the registers for the 9983 to the 19988? Are they a spot-on > match?
I don't think they're a spot-on match. I remember having to cross reference all the information I could find in order to build my own list of register definitions. My code is here if it helps: http://git.minix3.org/?p=minix.git;a=blob;f=drivers/tda19988/tda19988.c;hb=HEAD Though it's only for EDID reading (not using the chip for actually outputting HDMI). Thomas On Mon, Jan 20, 2014 at 10:21 AM, Travis Estep <teste...@gmail.com> wrote: > 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 a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/jb8jD3Y_zZ0/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/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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
