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by ceteras
Mon Dec 16, 2013 10:19 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 885
Views: 409991

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

I've installed the I2S drivers using pasdesignal's blog instructions. The driver seems to work quite well, but I have a side issue with my raspberry. After installing the driver, I can no longer halt the system. With "sudo shutdown -h now", or "sudo halt", or "sudo init 0", the system reboots. It us...
by ceteras
Sun Dec 15, 2013 9:07 pm
Forum: Troubleshooting
Topic: Restart instead of halt
Replies: 7
Views: 1097

Re: Restart instead of halt

An rpi-update on the misbehaving sd-card caused it to shut down properly, but also I've lost some changes I've made. I didn't want to write about what I did to get to this problem, because I was hoping for more general answers. It's koalo's I2S drivers that got me here, so I think I will post in his...
by ceteras
Thu Dec 12, 2013 8:47 am
Forum: Troubleshooting
Topic: Restart instead of halt
Replies: 7
Views: 1097

Re: Restart instead of halt

So a mismatch between the firmware and kernel could cause it.
Thank you for the replies. I was curious to know if many others have the same issue or not, and what could cause it.
by ceteras
Tue Dec 10, 2013 8:23 pm
Forum: Troubleshooting
Topic: Restart instead of halt
Replies: 7
Views: 1097

Re: Restart instead of halt

I've just tested the fresh raspbian install and it halts as is should, blinking ACT led and all. No restart.
Now if I only could get the other one to do the same... I don't want to re-install and configure everything here.
Any kind of hints would be much appreciated!
by ceteras
Tue Dec 10, 2013 2:29 pm
Forum: Troubleshooting
Topic: Restart instead of halt
Replies: 7
Views: 1097

Re: Restart instead of halt

I saw that thread, but I have nothing attached to my Pi, so I don't think it applies to my case.
by ceteras
Tue Dec 10, 2013 12:22 pm
Forum: Troubleshooting
Topic: Restart instead of halt
Replies: 7
Views: 1097

Restart instead of halt

Hi, I wanted to build something for my Pi, based on this behaviour I knew: after executing halt, shutdown -h now, or init 0, raspbian would blink the ACT led ten times then stay put. The plan was to build something to detect those 10 blinks with their timing too and cut the power. However, my Raspbe...
by ceteras
Wed Oct 09, 2013 5:51 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 885
Views: 409991

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

tjaekel wrote:Yes, I have created audiophile DAC PCB, with PCM1794, works nice on Raspberry Pi:
http://www.tjaekel.com/T-DAC
Nice work!
Please can you explain how you feed the SCK (system clock) to your board?
As far as I know, the RPi does not have a such system clock output on P5 connector.
by ceteras
Wed Oct 09, 2013 3:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Opinions on these cheap i2s S/PDIF/ TOSLINK/ analogue DACs?
Replies: 8
Views: 13804

Re: Opinions on these cheap i2s S/PDIF/ TOSLINK/ analogue DA

I've followed the I2S megathread for the same reason, I want to use an audio DAC which is not mentioned there, just hoping on compatibility. I use TDA1387 which I hope will work with the TDA1541 driver. My point is nobody should anser that "no, it definitely won't work". Read the datasheets for your...
by ceteras
Wed Sep 04, 2013 12:14 am
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

Yes, it was me. I'd do that.
Did you try to find a schematic diagram of the dvd player? It would help a lot.
by ceteras
Wed Sep 04, 2013 12:00 am
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

Negative. 100ohm is too small.
Traces could go underneath the chips then trough the other side of the pcb.
by ceteras
Tue Sep 03, 2013 11:38 pm
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

Look for an 100ohm resistor, check if it's between the two pins. The resistor might be marked 101.
by ceteras
Tue Sep 03, 2013 11:24 pm
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

No. Pin 63 might also be connected to something else in the dvd, you need to make sure it's not the case.
But first check pin 2 if it has a connection to pin 37 of CSC3100 .
by ceteras
Tue Sep 03, 2013 11:05 pm
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

You have been a little mislead. Pin 37 is tied to Vcc by a 1.8K, because it's an open collector output, so it needs a pull-up resistor. The 8D02D has separate sync inputs at pins 56, 57, and a composite sync input at pin 2. You need a connection from pin 37 CSC3100 to pin 2 8D02D . Also pin 63 8D02D...
by ceteras
Tue Sep 03, 2013 10:38 pm
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

I think you should check the sync signals now. There is another big chip near CSC3100. The OP had HX8806ALA. This is the timming controller. Let me know what kind of chip it is, so I can see its datasheet. You need to check pin 37(sync out) of CSC3100 if it is connected to the timming controller. Sy...
by ceteras
Tue Sep 03, 2013 10:00 pm
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

What about the original connection to video in pin, did you disconnect the pin from the dvd board?
by ceteras
Tue Sep 03, 2013 9:32 pm
Forum: Other projects
Topic: Salvaging screen from old portable DVD player (working)
Replies: 76
Views: 34421

Re: Salvaging screen from old portable DVD player (working)

Check also pin 7, it must be "low", tied to ground.
by ceteras
Tue Sep 03, 2013 4:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DSI Screen Availability
Replies: 35
Views: 9834

Re: DSI Screen Availability

The difference is that an LCD screen has far fewer parameter to set, no calibration and fine tuning required. It doesn't need to be as ubiquitous as I2C (which most anybody can work with). If 10 people of all the community have the skills to build adapters and config files for DSI, they would sell s...
by ceteras
Wed Aug 14, 2013 8:37 am
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi transistors and composite video
Replies: 1
Views: 890

Re: Raspberry Pi transistors and composite video

You can use a pnp transistor connected at the positive rail of TV's power supply. Emitter to +Vcc, collector to the TV power. 1K resistor between base and emitter, 10K resistor from base to GPIO. When GPIO is low, the power is on. What voltage your TV is working at? Edit: Actually if your TV voltage...
by ceteras
Tue Jun 04, 2013 2:15 pm
Forum: Other projects
Topic: Where do you want to see FBTFT go next?
Replies: 99
Views: 35280

Re: Where do you want to see FBTFT go next?

I think for the databus you need one more GPIO for switching between the 8bit latches. As far as I'm concerned, I prefer the solutions with the smallest parts count (and tracks count too). Perhaps a 16bit latch could be used. Tie the two 8bits inputs together and control their latching with their se...
by ceteras
Tue Jun 04, 2013 2:09 pm
Forum: Other projects
Topic: What's the situation with DSi?
Replies: 31
Views: 20212

Re: What's the situation with DSi?

I didn't mean that. I'm sorry. You mean the people who have worked on the CSI camera interface were neglecting their day jobs and families all this time? That is very sad. Or, perhaps they are not the same people that could work on the DSI, I am very confused about this. Perhaps we should open an In...
by ceteras
Tue Jun 04, 2013 12:50 pm
Forum: Other projects
Topic: What's the situation with DSi?
Replies: 31
Views: 20212

Re: What's the situation with DSi?

Any chance the Foundation overlords may share with us their DSI driver plans? Or at least plans for making an announcement? :mrgreen: I won't lie, having the camera whetted my apetite, while it will keep me busy for the coming months it would be excellent to know the timeframe for the display. +1, ...
by ceteras
Tue Jun 04, 2013 12:30 pm
Forum: Other projects
Topic: Where do you want to see FBTFT go next?
Replies: 99
Views: 35280

Re: Where do you want to see FBTFT go next?

I think that using an expander for 16bit interfaces would be more elegant. Such as the MCP23S17 for SPI or MCP23017 for I2C.
But these chips only provide 16bit, and no control for WR and CS signals.
Still, could this be somehow implemented?
by ceteras
Tue Jun 04, 2013 12:21 pm
Forum: Other projects
Topic: Cell Phone screens
Replies: 2
Views: 4909

Re: Cell Phone screens

Indeed, if you search the forum first, you can find your answer.

Smartphone screens are more likely to be DSI interfaced.
So google "dsi site:www.raspberrypi.org/phpBB3" .

Long story short: it will happen, but we the grasshoppers need to pay patience.
by ceteras
Tue Jun 04, 2013 9:57 am
Forum: Other projects
Topic: $61 HDMI LCD 800x480
Replies: 6
Views: 13413

Re: $61 HDMI LCD 800x480

This board is based on Realtek RTD2662 chip, which supports I2S output for HDMI. It's too bad if the board does not provide access to these pins/functionality (it doesn't seems so from the pictures) . Can anybody please post a high resolution picture of the board? Pins 108 - 114 are the I2S port and...
by ceteras
Tue May 28, 2013 7:31 pm
Forum: Other projects
Topic: Is 8bit to 6bit dithering possible?
Replies: 9
Views: 4488

Re: Is 8bit to 6bit dithering possible?

That would be great!

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