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by jamesh
Mon Oct 22, 2018 3:51 pm
Forum: Bare metal, Assembly language
Topic: Touch screen sensitivity for official 7" screen (rpi-ft5406)
Replies: 7
Views: 161

Re: Touch screen sensitivity for official 7" screen (rpi-ft5406)

https://image.noelshack.com/fichiers/2018/43/1/1540219891-rpi.png I noticed with a multimeter that those I2C pins on the display PCB are directly connected to the FT5406, but the RPI doesn't need them since it controls it through the ribbon cable. Is it possible to disable the automatic touch scree...
by jamesh
Mon Oct 22, 2018 3:48 pm
Forum: Bare metal, Assembly language
Topic: Code between framebuffer and output?
Replies: 4
Views: 98

Re: Code between framebuffer and output?

There are some registers to allow the final HVS output to have a colour correction, but they are not used, and not apaprently expose via an API. Is this the sort of thing you are after?
by jamesh
Mon Oct 22, 2018 3:46 pm
Forum: Troubleshooting
Topic: Diagonal flashing when screen refreshes or images displayed in browser
Replies: 7
Views: 147

Re: Diagonal flashing when screen refreshes or images displayed in browser

I tried using extra_transpose_buffer and it seems to make little or no difference. Are there other options to try? I do note that display_rotate is deprecated so I replaced that with display_hdmi_rotate and am testing to see if that makes a difference. Also, our application uses Chromium and OMXPla...
by jamesh
Mon Oct 22, 2018 2:21 pm
Forum: Troubleshooting
Topic: Lightning bolt with 5.5 4A power supply
Replies: 10
Views: 267

Re: Lightning bolt with 5.5 4A power supply

To add to what has already been said... In my experience, just about any old power supply will do. In fact, the constant "advice" given on this forum to always buy the "official" power supply seems misguided. The fact is that you really only need all those amps if you are running lots of peripheral...
by jamesh
Mon Oct 22, 2018 2:19 pm
Forum: Beginners
Topic: Question about Backups
Replies: 6
Views: 104

Re: Questiob about Backups

Presumably your SD card is 16GB? The backup has probably copied the entire card, including the empty space. Using dd or Win32 diskimager will do that. Zipping up the backup should reduce size a lot. Or you could use PiClone which only copies data. My SD card is 128gb and i zipped it and reduced it ...
by jamesh
Mon Oct 22, 2018 12:22 pm
Forum: Beginners
Topic: Question about Backups
Replies: 6
Views: 104

Re: Questiob about Backups

Presumably your SD card is 16GB? The backup has probably copied the entire card, including the empty space. Using dd or Win32 diskimager will do that.

Zipping up the backup should reduce size a lot.

Or you could use PiClone which only copies data.
by jamesh
Mon Oct 22, 2018 12:17 pm
Forum: Bare metal, Assembly language
Topic: Touch screen sensitivity for official 7" screen (rpi-ft5406)
Replies: 7
Views: 161

Re: Touch screen sensitivity for official 7" screen (rpi-ft5406)

OK, tried setting the sensitivity pararmeter to 1, then 200 (max 255). I could not detect any difference in the 'sensitivity` of the touches - they were really quite sensitive at either end of the range - I hardly need to touch the display for the press to be detected. So not sure if there is anythi...
by jamesh
Mon Oct 22, 2018 12:02 pm
Forum: Advanced users
Topic: Moving Linux kernel to 4.19
Replies: 30
Views: 858

Re: Moving Linux kernel to 4.19

cjan wrote:
Mon Oct 22, 2018 11:39 am
4.19 is out.
Not in the apt repos yet, still testing AFAIK.
by jamesh
Mon Oct 22, 2018 10:47 am
Forum: Bare metal, Assembly language
Topic: Touch screen sensitivity for official 7" screen (rpi-ft5406)
Replies: 7
Views: 161

Re: Touch screen sensitivity for official 7" screen (rpi-ft5406)

Hmm, do appear to be some registers for sensitivity available on the FT5426, but they return 0 in my tests, might depend on whether we are using the 5406 or the 5426 (I believe we use both). I can try setting them but not sure if I would notice any changes.
by jamesh
Mon Oct 22, 2018 10:38 am
Forum: Graphics, sound and multimedia
Topic: Realtime H.264 encoding on the RPI 3B
Replies: 2
Views: 50

Re: Realtime H.264 encoding on the RPI 3B

Yes, that should be fine.

Ther eis an inbuilt H264 encoder, the raspistill app can be used to stream H264 directly, or you can use a gstreamer pipeline and the v4l2 driver.
by jamesh
Mon Oct 22, 2018 9:10 am
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 244
Views: 18232

Re: PoE HAT - USB Ports not working - over-current

Ok, so, I'm a little annoyed as well. I was able to order this product on the 19th Sept, I had not thought to do any google searches to find out if there are any problems. In between ordering (and shipping) of the HAT and it arriving i mentioned it on a forum thread i am a part of, a few people the...
by jamesh
Mon Oct 22, 2018 8:58 am
Forum: Troubleshooting
Topic: Video for 1080x2880
Replies: 34
Views: 569

Re: Video for 1080x2880

Just for the records: I tried with display_hdmi_rotate=2 and 3 as well and image always equal. Also tried with display_rotate=1 and gpu_mem=944 and didn't boot. Rotate on frambuffers over 2000x2000 are disabled. Simply because the Pi does not have the processing power to do that level of rotate and...
by jamesh
Mon Oct 22, 2018 8:55 am
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 244
Views: 18232

Re: PoE HAT - USB Ports not working - over-current

Is there anything that can be done? Other than send it back for replacement, probably not. It may depend on how much information we get about the gory details of what the problem turned out to be. I'm intrigued by James's anectdote: ... some community members sent guaranteed non-working devices, in...
by jamesh
Sun Oct 21, 2018 9:08 pm
Forum: Bare metal, Assembly language
Topic: Touch screen sensitivity for official 7" screen (rpi-ft5406)
Replies: 7
Views: 161

Re: Touch screen sensitivity for official 7" screen (rpi-ft5406)

Hmm. The driver for the official LCD touchscreen is on the GPU, so inaccessible. I'd need to make some changes to support this.

I'll take a look Monday to see if it is feasible.
by jamesh
Sat Oct 20, 2018 7:32 am
Forum: General discussion
Topic: Rpi 0W bulk buy
Replies: 4
Views: 186

Re: Rpi 0W bulk buy

Hi, On another thread jamesh said to PM him regarding bulk purchases of the Rpi0/1.3 and Rpi0W. I am interested in additional information; I'd like to get pricing, availability and delivery times for order quantities of 500, 1500, and 15k. I am an EE for a commercial vendor potentially interested i...
by jamesh
Fri Oct 19, 2018 2:48 pm
Forum: Android
Topic: unable to use touch via hdmi
Replies: 3
Views: 100

Re: unable to use touch via hdmi

Just connecting the Pi to an HDMI device will not provide any sort of touchscreen facility - HDMI is output only, and the touchscreen data need to get back to the Pi somehow. When connecting a HDMI monitor with touchscreen, usually there is a USB or similar connection as well.
by jamesh
Fri Oct 19, 2018 2:45 pm
Forum: Media centres
Topic: New TV Tuner from HQ
Replies: 65
Views: 1617

Re: New TV Tuner from HQ

recieved my tv hat this afternoon, followed the tutorial on PiHut to set up Tvheadend but the hat seems to kill the Pi's wifi, when the hat is removed the Pi connects to the network no problem, happens with Pi0w and Pi3. haven't tried ethernet yet, need to investigate further, hope I've not got a d...
by jamesh
Fri Oct 19, 2018 1:52 pm
Forum: Troubleshooting
Topic: Video for 1080x2880
Replies: 34
Views: 569

Re: Video for 1080x2880

I'm quite surprised it works at, apparently, 60fps. I would have expected that resoution to be too high. i wonder if the height is less important than the width. As the SBC was also used for mobile phones in the past this could be possible I think. Question now is: is it working when rotated to lan...
by jamesh
Fri Oct 19, 2018 1:20 pm
Forum: Troubleshooting
Topic: Video for 1080x2880
Replies: 34
Views: 569

Re: Video for 1080x2880

I'm quite surprised it works at, apparently, 60fps. I would have expected that resoution to be too high. i wonder if the height is less important than the width.
by jamesh
Fri Oct 19, 2018 12:36 pm
Forum: Media centres
Topic: New TV Tuner from HQ
Replies: 65
Views: 1617

Re: New TV Tuner from HQ

I guess some people will be looking at SDR capabilities, I've not read the release yet though. I did not find anything useful in that respect when I looked. There is no documentation on the chip used I could find and no one else seems to have had any luck either. Can it do S2 or is it just T2 ? Jus...
by jamesh
Fri Oct 19, 2018 12:34 pm
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 233
Views: 9736

Re: Multiple Frame buffer beta testers wanted

Tested with a fresh installation where it did not work (lost USB devices; same as already reported earlier). Then used an old installation. After update/upgrade/rpi-update/reboot only one framebuffer was generated. Replaced the kernel7.img and start_x.elf with your files and then got it working. Ne...
by jamesh
Fri Oct 19, 2018 12:22 pm
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 244
Views: 18232

Re: PoE HAT - USB Ports not working - over-current

I LIKE to be an early adopter but did not go for a pre-order or even an immediate order when available. Reason: Time between announcement and availability was too long - to me a warning sign. Then when they became available I waited a few weeks to first check for Raspberry POE hat Problems in a sea...
by jamesh
Fri Oct 19, 2018 9:51 am
Forum: Camera board
Topic: Realtime Geometric Camera/Lens Distortion Correction
Replies: 4
Views: 121

Re: Realtime Geometric Camera/Lens Distortion Correction

Worth noting that large distortions corrections in the ISP do slow down the frame rate. ISTR a colleague at BRCM using the distortion block to correct for odd sensor shapes, and we were unable to maintain required framerates. I believe it did depend on the extent of the correction required. That may...
by jamesh
Fri Oct 19, 2018 9:47 am
Forum: Off topic discussion
Topic: Add Analog to Digital pins to the pi
Replies: 14
Views: 1007

Re: Add Analog to Digital pins to the pi

Adding new stuff like this means the price increases for everyone (or profit levels decrease), even if not everyone wants to use the feature. Which we try and avoid. As others have said, it's what HAT's are for.
by jamesh
Fri Oct 19, 2018 9:44 am
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 244
Views: 18232

Re: PoE HAT - USB Ports not working - over-current

A Google search for "raspberry Pi PoE HAT overcurrent" Oh, come on - there's no way anyone can run that search until they not only know there's a problem, but something about the specific nature of the problem. Someone who just wants a hat and has no idea why they're out of stock most places isn't ...

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