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by james-at-lo-tech
Wed Mar 22, 2017 12:24 pm
Forum: Device Tree
Topic: DPI Framebuffer Driver
Replies: 1
Views: 1125

Re: DPI Framebuffer Driver

Anyone know of the latest on this?
by james-at-lo-tech
Thu Feb 16, 2017 8:56 pm
Forum: Beginners
Topic: STICKY: Using a Gert VGA 666 adapter - [HOWTO]
Replies: 199
Views: 211088

Re: Using a Gert VGA 666 adapter - [HOWTO]

No, the resistor values simply govern the DAC accuracy and any resultant non linearities at bit place boundaries, which show up as dark or light lines across smooth colour shading gradients. The values should really be slightly lower than specified, especially at the MSB end, due to the output imped...
by james-at-lo-tech
Wed Feb 15, 2017 7:35 pm
Forum: Beginners
Topic: STICKY: Using a Gert VGA 666 adapter - [HOWTO]
Replies: 199
Views: 211088

Re: Using a Gert VGA 666 adapter - [HOWTO]

So I plugged the Gert666 into a new RPi 3B and the image quality was much better than the RPi A+. Nothing else was changed. It still wasn't good enough for me (still a slight noise level), so I switched to an HDMI-to-VGA adapter instead for best quality. There must be something about the A+ giving ...
by james-at-lo-tech
Thu Jan 26, 2017 8:56 pm
Forum: Beginners
Topic: STICKY: Using a Gert VGA 666 adapter - [HOWTO]
Replies: 199
Views: 211088

Re: Using a Gert VGA 666 adapter - [HOWTO]

it would transform the use of this board for desktop (thin client) purposes, e.g. Citrix, WTware etc
by james-at-lo-tech
Mon Jan 09, 2017 7:58 am
Forum: Beginners
Topic: Can I hire someone to set up TOR
Replies: 5
Views: 1490

Re: Can I hire someone

Maybe not as invisible as you think, read up on Windows 10 DNS leakage.
by james-at-lo-tech
Thu Jan 05, 2017 8:08 pm
Forum: Device Tree
Topic: DPI Framebuffer Driver
Replies: 1
Views: 1125

DPI Framebuffer Driver

I need to create a framebuffer instance for a parallel DPI interface whilst primary display is connected to HDMI, i.e. to have /dev/fb0 as HDMI and /dev/fb1 as DPI. The dpi overlays work OK in that the displays work together, but only e.g. omxplayer can use the secondary display pretty much. I think...
by james-at-lo-tech
Thu Jan 05, 2017 7:48 pm
Forum: Other projects
Topic: Sharp LQ092B5DW01 (960x160pixel TFT module) meets RPi3
Replies: 26
Views: 8904

Re: Sharp LQ092B5DW01 (960x160pixel TFT module) meets RPi3

In my testing,
  • To play on DPI device when desktop is on HDMI device: omxplayer --display 4 test.mp4
  • To play on HDMI device when desktop is on DPI device: omxplayer --display 5 test.mp4
by james-at-lo-tech
Thu Jan 05, 2017 5:08 pm
Forum: Other projects
Topic: Sharp LQ092B5DW01 (960x160pixel TFT module) meets RPi3
Replies: 26
Views: 8904

Re: Sharp LQ092B5DW01 (960x160pixel TFT module) meets RPi3

Omxplayer works fine with DPI interface, but we need a framebuffer driver to create /Dev/fb1 for the non-primary display for it to be usable by lightdm.
by james-at-lo-tech
Thu Jan 05, 2017 2:54 pm
Forum: Other projects
Topic: Sharp LQ092B5DW01 (960x160pixel TFT module) meets RPi3
Replies: 26
Views: 8904

Re: Sharp LQ092B5DW01 (960x160pixel TFT module) meets RPi3

Did you achieve concurrent output to this and the HDMI output via framebuffer device mapping somehow?
by james-at-lo-tech
Sun Jan 01, 2017 8:33 am
Forum: Off topic discussion
Topic: Will windows soon work on the pi?
Replies: 35
Views: 7144

Re: Will windows soon work on the pi?

Windows for me has become an odd beast as it with '10, it seems to be really quite unreliable technically but also very disjointed cosmetically. The hardware requirements are though the killer in terms of the RPi though as it's really quite unusable without an SSD. Running '10 on the RPi I think wou...
by james-at-lo-tech
Sat Dec 31, 2016 1:28 pm
Forum: Beginners
Topic: STICKY: Using a Gert VGA 666 adapter - [HOWTO]
Replies: 199
Views: 211088

Re: Using a Gert VGA 666 adapter - [HOWTO]

I've released a 24-bit VGA board today - see here . With the 6-bits per channel, the colours in the current design already show 'banding' (In some places the colour jumps are clearly visible). The banding I think is because of the GPIO output impedance; in my testing it can be reduced somewhat by s...
by james-at-lo-tech
Fri Dec 30, 2016 8:36 pm
Forum: General discussion
Topic: Just out of curiosity, what x86 is RPi3 equivalent.
Replies: 44
Views: 87292

Re: Just out of curiosity, what x86 is RPi3 equivalent.

According to Geekbench, it scores about the same as an iPhone 6 or an Intel E5300. RPi: https://browser.primatelabs.com/geekbench2/2596704 Charts: https://browser.primatelabs.com/processor-benchmarks/ It really does depend on the application though; some database needing heaps of IOPS will be fairly...
by james-at-lo-tech
Thu Dec 29, 2016 5:05 pm
Forum: Compute Module
Topic: Has the CM3 launched?
Replies: 11
Views: 2482

Re: Has the CM3 launched?

Is there Zero somehow subsidised? It's just the the CM is such a lot more per unit.
by james-at-lo-tech
Thu Dec 29, 2016 8:14 am
Forum: General discussion
Topic: Deciding to take the plunge
Replies: 5
Views: 1418

Re: Deciding to take the plunge

Indeed, the main draw is surely the GPIO header, meaning it can be connected to other things - your house alarm, the coffee machine, an infrared beam in the bird box - whatever you want really ;)
by james-at-lo-tech
Thu Dec 29, 2016 8:01 am
Forum: Español
Topic: [Solucionado] Problemas Dual Screen
Replies: 7
Views: 4396

Re: Problemas Dual Screen

Currently Raspbian appears to support only one screen. The second can be used by certain software, for example omxplayer. Hopefully this will change in the future.
by james-at-lo-tech
Tue Dec 27, 2016 6:49 pm
Forum: Device Tree
Topic: GPIO Drive Strength
Replies: 2
Views: 1326

Re: GPIO Drive Strength

OK, rc.local script I think is easier, thanks.
by james-at-lo-tech
Tue Dec 27, 2016 6:00 pm
Forum: Device Tree
Topic: GPIO Drive Strength
Replies: 2
Views: 1326

GPIO Drive Strength

Is it possible to set the GPIO drive strength via an overlay?

I tried already brcm,drive-strength and brcm,drive_strength_mA but without success.
by james-at-lo-tech
Mon Dec 26, 2016 4:28 pm
Forum: General discussion
Topic: SD Card replacement with on-board memory ?
Replies: 24
Views: 6525

Re: SD Card replacement with on-board memory ?

Personally I've seen highest failure rates in the top branded cards. I don't have enough data to present any scientific information though, only enough experience to know that they are a weak point.
by james-at-lo-tech
Mon Dec 26, 2016 4:08 pm
Forum: General discussion
Topic: SD Card replacement with on-board memory ?
Replies: 24
Views: 6525

Re: SD Card replacement with on-board memory ?

It's never been a problem with other embedded solutions eg OpenWRT. We just need a reset button to do (something). Or boot from SD card if present by preference.
by james-at-lo-tech
Mon Dec 26, 2016 3:26 pm
Forum: General discussion
Topic: SD Card replacement with on-board memory ?
Replies: 24
Views: 6525

Re: SD Card replacement with on-board memory ?

I'm with the OP as in my experience SD cards are not particularly reliable - made down to a price, I guess. Some higher quality on-board flash would be good.
by james-at-lo-tech
Sat Dec 24, 2016 7:56 pm
Forum: Troubleshooting
Topic: 1+1 watt amplifier attached to 3.5mm line out interference
Replies: 10
Views: 2232

Re: 1+1 watt amplifier attached to 3.5mm line out interferen

Try changing the USB supply. Apple charges have very good noise performance.
by james-at-lo-tech
Sat Dec 24, 2016 11:28 am
Forum: General discussion
Topic: Using RPi in a commercial project
Replies: 27
Views: 6918

Re: Using RPi in a commercial project

Just about every commercial router, switch, firewall, access point etc depends on open source software, namely some Linux variant.
by james-at-lo-tech
Sat Dec 24, 2016 10:16 am
Forum: General discussion
Topic: RiPi and 3v switch
Replies: 4
Views: 1017

Re: RiPi and 3v switch

If you are happy with soldering then my GPIO board could do what you need with just the ULN2803 (and headers) populated; the DS1820 temperature sensor might also be useful in turning off the appliance once the room gets above a certain point (assuming opening the switch turns it off).
by james-at-lo-tech
Sat Dec 24, 2016 10:07 am
Forum: Media centres
Topic: Help me finish my audio project - To connect speakers do I n
Replies: 3
Views: 1193

Re: Help me finish my audio project - To connect speakers do

Audio can also be delivered through HDMI to an amplifier that way. There are also high-quality DAC HATs available, which again would be used to feed an amplifier (or active speakers).

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