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by ceteras
Thu Jun 26, 2014 10:59 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Getting vsync from hdmi.
Replies: 11
Views: 4835

Re: Getting vsync from hdmi.

I've sent you a link to a schematic. You can identify the trace on the schematic going to two pins on the "IC9517 HD64F3694 SUB MICRO". Pins 27 and 28. It's a lot easier to tap there as they are two adjacent pins so you can stick a thin wire between them and carefully solder it. I've successfully us...
by ceteras
Wed Jun 25, 2014 10:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Getting vsync from hdmi.
Replies: 11
Views: 4835

Re: Getting vsync from hdmi.

The vsync coming out of that Sony hdmi board is that before converting to analog video with the source refresh rate intact? I tried finding some schematic for it but I haven't had any luck so far. Is that a fpga under the heatsink? That vsync is decoded from the HDMI signal, so it's the original. C...
by ceteras
Wed Jun 18, 2014 8:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Getting vsync from hdmi.
Replies: 11
Views: 4835

Re: Getting vsync from hdmi.

You can use this board , it's from a sony lcd tv (KV30HS420). The board has a Vsync signal, I can help you find it (schematics are available on the internet too). With this board you can still send component video to a TV and sound from HDMI is also available. It only needs 9Vdc power. Edit: the bro...
by ceteras
Tue May 13, 2014 8:13 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 926
Views: 473331

Re: I2S: Anyone got it running? (answer is yes!)

It would be nice to have an update on the new driver here, I think I'm not the only one for whom it would be difficult to find this out from github. Thanks!
by ceteras
Mon May 05, 2014 1:34 pm
Forum: Other projects
Topic: LCD - HMDI - LVDS to build a complete system
Replies: 8
Views: 7651

Re: LCD - HMDI - LVDS to build a complete system

You can find boards with LVDS output, custom configured for your display, if you search ebay for "lvds controller board".
by ceteras
Mon Apr 21, 2014 9:18 pm
Forum: Other projects
Topic: Is 8bit to 6bit dithering possible?
Replies: 11
Views: 5428

Re: Is 8bit to 6bit dithering possible?

Your problem is a different one. Your LCD panel's native resolution is higher than the one the Pi is sending out, that's all. Give the panel make/model and the resolution settings in config.txt, and we'll see. My guess is that your panel is an 1280x800 and your Pi is configured at 1024x768. That's h...
by ceteras
Tue Apr 15, 2014 3:09 pm
Forum: Compute Module
Topic: Powering the compute module
Replies: 17
Views: 10570

Re: Powering the compute module

Look at the IO board schematic, you need to provide all the voltages that board provides.
Except the Vdac, 2.5V, which is the power for the video out feature.
by ceteras
Tue Apr 15, 2014 12:49 pm
Forum: Compute Module
Topic: Basic IO board for the CM
Replies: 25
Views: 16837

Re: Basic IO board for the CM

I wonder what would the limits be for a two-layers board? A four-layers pcb seems a little too much for me right now. If you need to use any of the differential signals: HDMI, CAM,DSI and even USB routing on 2 layers will be difficult. 2 layer carrier board with some GPIO (UART, I2C, SPI) should be...
by ceteras
Tue Apr 15, 2014 12:29 pm
Forum: Compute Module
Topic: What would you do with a Compute Module?
Replies: 50
Views: 11839

What would you do with a Compute Module?

Even if it is clearly intended for the bigger guns, not for hobbyists, the CM has sparkled a huge amount of interest. Show someone a toy, tell them it's not for them, and they'll want it really bad! :lol: I wonder how many of us could design a complete IO board for the CM, at a production-ready leve...
by ceteras
Fri Apr 11, 2014 9:19 pm
Forum: Compute Module
Topic: Basic IO board for the CM
Replies: 25
Views: 16837

Re: Basic IO board for the CM

I wonder what would the limits be for a two-layers board?
A four-layers pcb seems a little too much for me right now.
by ceteras
Fri Apr 11, 2014 7:23 am
Forum: Compute Module
Topic: Basic IO board for the CM
Replies: 25
Views: 16837

Re: Basic IO board for the CM

cleverca22 wrote:it would also be usefull if the starting schematic would have the basic power supply on it, so you just tie something to the 5v bus and data pins
This is what I want to do next.
by ceteras
Thu Apr 10, 2014 1:29 pm
Forum: Compute Module
Topic: Basic IO board for the CM
Replies: 25
Views: 16837

Re: Basic IO board for the CM

I believe at this level the schematic should be easy to be directly created in KiCad, by someone experienced.
It's only a part, after all.
by ceteras
Wed Apr 09, 2014 4:55 pm
Forum: Compute Module
Topic: Basic IO board for the CM
Replies: 25
Views: 16837

Re: Basic IO board for the CM

You need to extract the archive, you will get a folder with the two files in it: basicBoard.brd and basicBoard.sch .
Open those with eagle.
by ceteras
Wed Apr 09, 2014 12:29 pm
Forum: Compute Module
Topic: Basic IO board for the CM
Replies: 25
Views: 16837

Basic IO board for the CM

Designing an IO board for the CM is a lot of work, but that doesn't mean one should not try it, for an exercise at least. I've created a small eagle 6.5 schematic containing only a DDR2 sodimm socket, where each pin has its name according to the Computing Module pinout. So it is a starting point for...
by ceteras
Sat Mar 22, 2014 4:36 pm
Forum: Graphics, sound and multimedia
Topic: 60 pin LCD screen hdmi controller thing
Replies: 1
Views: 6751

Re: 60 pin LCD screen hdmi controller thing

This device (a TCON - timing controller) converts lvds signal to 60-pin ttl (including all power supplies and gamma voltages needed). http://www.ebay.com/itm/HCR-TCON-V2-TCON-Board-LVDS-TTL-converter-board-20-pin-60-Pin-A104SN03-V1-/280919109393?pt=US_Server_Boards&hash=item4168156f11 Then you need ...
by ceteras
Wed Mar 19, 2014 12:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: HDMI In Module: read 256 bytes from a single I2C address
Replies: 2
Views: 1615

Re: HDMI In Module: read 256 bytes from a single I2C address

That is a very interesting project. What chip do you use for parallel to CSI interfacing?
by ceteras
Tue Mar 18, 2014 10:10 pm
Forum: Advanced users
Topic: Removing the ethernet controller from a model B?
Replies: 12
Views: 4237

Re: Removing the ethernet controller from a model B?

I think you should also cut the power traces to the hub, if you want to make sure to lower your device's power consumption.
by ceteras
Mon Mar 17, 2014 1:10 pm
Forum: General discussion
Topic: Any news on official Raspberry Display?
Replies: 260
Views: 97023

Re: Any news on official Raspberry Display?

You can see an example of DSI reverse enineering work in this playlist from mikeselectricstuff youtube channel . Mike has reversed engineered an ipod nano DSI display and managed to interface it with his own circuitry. His job was not really the same as connecting one such display to a raspbberry pi...
by ceteras
Sun Mar 09, 2014 1:21 pm
Forum: General discussion
Topic: Any news on official Raspberry Display?
Replies: 260
Views: 97023

Re: Any news on official Raspberry Display?

[...] And here's a pic http://raspi.tv/wp-content/uploads/2014/03/DSC_0579.jpg If I understand correctly, they have a different blob running on the VC4 that enables DSI and sends the correct initialisation commands for the display. I hope this procedure will be made customisable so others could ini...
by ceteras
Sun Mar 09, 2014 1:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Interfacing Lcd with Rpi
Replies: 1
Views: 698

Re: Interfacing Lcd with Rpi

"8 bit 8080 parallel interface Lcd" is too generic, at least for me.
Can you be more specific about the exact lcd device you have?
At least a model number, or a picture, but a link to it's specs would be best.
by ceteras
Sun Feb 16, 2014 9:50 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: scavenged lcd display
Replies: 3
Views: 2162

Re: scavenged lcd display

That's negative. DSI is still an disabled port, nobody can get anything working on it.
Read the threads for more on this.
by ceteras
Wed Feb 12, 2014 11:34 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: TI ADS12313P ADC
Replies: 1
Views: 560

Re: TI ADS12313P ADC

Yes, you can say it is pre-programmed, that is you don't need to learn a programming language for its internal microcontroller. It reacts to instructions and commands sent to it from the raspberry pi (or other system if you want). You always need to make sure you understand each and every word and f...
by ceteras
Thu Jan 23, 2014 12:01 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 926
Views: 473331

Re: I2S: Anyone got it running? (answer is yes!)

Negative! If you look at the shield schematic the SPI-named signals at J3 are buffered towards WM831, so let's look at the trace names after the buffers: - SPI SCK -> BCLK - SPI MOSI -> DACDAT - SPI MISO -> ADCDAT - SPI SS -> LRC On the arduino, WM831 is configured to work wit an SPI interface (WM a...
by ceteras
Wed Jan 22, 2014 5:48 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 926
Views: 473331

Re: I2S: Anyone got it running? (answer is yes!)

Hi, does anybody know how to connect the Audio Codec Shield form Open Music Labs to the raspi? http://www.openmusiclabs.com/projects/codec-shield/ Thanks, Werner You can see the schematic for the shield on their wiki page . The WM831 on the shield is configured to use 2-wire interface, that is I2C....

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