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by 6by9
Sat Nov 17, 2018 5:21 pm
Forum: Compute Module
Topic: Which Compute Module 3 pins for I2C bus to R-Pi Display?
Replies: 1
Views: 23

Re: Which Compute Module 3 pins for I2C bus to R-Pi Display?

https://www.raspberrypi.org/documentati ... display.md
Connect these pins together with jumper wires:

GPIO0 - CD1_SDA
GPIO1 - CD1_SCL
by 6by9
Sat Nov 17, 2018 5:17 pm
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 318
Views: 15007

Re: Multiple Frame buffer beta testers wanted

Did as suggested. Thanks! Now I want to know how to judge if VLC player really runs HW-accelerated. Opened a video for playback and moved the window 'accidentally' to the second display (frame buffer). This is what I got to see when stretched across the full desktop (video source file is FHD only, ...
by 6by9
Sat Nov 17, 2018 10:52 am
Forum: General discussion
Topic: Log Files for OpenCV or V4L2
Replies: 4
Views: 88

Re: Log Files for OpenCV or V4L2

V4l2 kernel logging is enabled via either /sys/class/video4linux/video0/dev_debug (bitmask of things to log), or for the Pi camera v4l2 driver via /sys/module/bcm2835_v4l2/parameters/debug (log level from 0 to 3). Both will log into the kernel log, so view with dmesg. (Typing that from memory, so I ...
by 6by9
Thu Nov 15, 2018 5:11 pm
Forum: Compute Module
Topic: EMMC_EN_N_1V8 troubles
Replies: 3
Views: 68

Re: EMMC_EN_N_1V8 troubles

Have you got pull ups on the HDMI I2C lines? If not then the firmware ends up clock stretching and timing out whilst trying to read the EDID.
by 6by9
Thu Nov 15, 2018 2:17 pm
Forum: Bare metal, Assembly language
Topic: Raspberry Pi 3 Model A+ details
Replies: 23
Views: 708

Re: Raspberry Pi 3 Model A+ details

jamesh wrote:
Thu Nov 15, 2018 1:36 pm
No 3A+ specific section, so assume it uses the same as the 3B+?
Ah yes, it's obfuscated to stop pesky users finding out about it before launch ;)
Yes it's based on the 3B+ with very few mods. I suspect Phil will be along with a patch adding the 3aplus fairly soon.
by 6by9
Thu Nov 15, 2018 1:14 pm
Forum: Bare metal, Assembly language
Topic: Raspberry Pi 3 Model A+ details
Replies: 23
Views: 708

Re: Raspberry Pi 3 Model A+ details

Thanks for infos! For the moment I suppose, the Act LED is High-active on GPIO 29 like on the RPi 3 B+. For the moment best to assume same as 3B+ unless indicated (ie. No ethernet, USB Hub, less memory). I'll try and find better answers but the guy who designed it is out of the office. Check the dt...
by 6by9
Wed Nov 14, 2018 9:51 pm
Forum: HATs and other add-ons
Topic: TV Hat is not detected by Tvheadend
Replies: 4
Views: 181

Re: TV Hat is not detected by Tvheadend

Linux version 4.9.29 ([email protected]) (gcc version 6.2.0 (GCC) ) #1 SMP Thu May 25 02:23:55 BST 2017 I believe Libreelec is now be using the 4.19 kernel, and that does support the TVHat. If you haven't updated to a release from approximately the time the product was released, then don't expect it...
by 6by9
Wed Nov 14, 2018 12:25 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 37
Views: 4094

Re: Hardware camera sync pulses

Don't forget to compile the dt-blob.dts file into a dt-blob.bin.

Code: Select all

sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob.dts
by 6by9
Wed Nov 14, 2018 12:24 pm
Forum: General discussion
Topic: How Raspberry Pi work with DMX512 RGBW led strip
Replies: 7
Views: 146

Re: How Raspberry Pi work with DMX512 RGBW led strip

Do you really want the DMX version? That means getting a DMX interface for the Pi (either USB, via the UART, or as a HAT). I wasn't aware of the UCS512A chip but it does seem to have implemented the USITT DMX-512 1990 protocol in a way which allows it to be used with any serial interface. It appear...
by 6by9
Wed Nov 14, 2018 9:56 am
Forum: General discussion
Topic: How Raspberry Pi work with DMX512 RGBW led strip
Replies: 7
Views: 146

Re: How Raspberry Pi work with DMX512 RGBW led strip

The DMX512 RGBW led strip is with 4-in-1 RGBW leds and ucs512a chip, just wondering how raspberry pi work with the tape? Do you really want the DMX version? That means getting a DMX interface for the Pi (either USB, via the UART, or as a HAT). There are a fair number of RGB LED tapes that can be dr...
by 6by9
Tue Nov 13, 2018 5:43 pm
Forum: Camera board
Topic: 4x4 binning
Replies: 5
Views: 425

Re: 4x4 binning

narragansett wrote:
Fri Nov 09, 2018 7:19 pm
Following up on this -- any developments?
As the PR isn't in a form that can be merged, it's been down my priority list.
I would convert it into a new mode, but with the range of computed values in there it isn't immediately clear to me all the register values.
by 6by9
Tue Nov 13, 2018 5:20 pm
Forum: Camera board
Topic: Pi Zero Camera v1.3 dropped frames
Replies: 13
Views: 296

Re: Pi Zero Camera v1.3 dropped frames

So I've been doing a few tests with this, also saving the output and converting to mp4 to rule out the conversion (I used ffmpeg in my testing) And I've gotten it to not drop frames on a few tests which is very good, not perfect but good, however it seems to be recording in a lower framerate than s...
by 6by9
Tue Nov 13, 2018 12:39 pm
Forum: Official Foundation Display
Topic: official display with dsi interface for bought
Replies: 4
Views: 212

Re: official display with dsi interface for bought

Eric has also written up some notes on adding DSI panels https://github.com/anholt/linux/wiki/Ra ... lay-panels
by 6by9
Tue Nov 13, 2018 11:20 am
Forum: Camera board
Topic: Pi Zero Camera v1.3 dropped frames
Replies: 13
Views: 296

Re: Pi Zero Camera v1.3 dropped frames

You've not given the Python scripts so we can't comment on them. Simplest test is to run raspivid -t 60000 -w 1280 -h 720 -o /dev/null -pts pts.txt -fps 30 Add any extra parameters that you're using. That will record with the camera for a minute and save the timestamps of every frame to a text file ...
by 6by9
Tue Nov 13, 2018 8:51 am
Forum: General discussion
Topic: Temporary failure resolving 'mirrordirector.raspbian.org'
Replies: 5
Views: 1527

Re: Temporary failure resolving 'mirrordirector.raspbian.org'

STATUS OF STRETCH as of 2018-11-12 Err:1 http://archive.raspberrypi.org/debian stretch InRelease Temporary failure resolving 'archive.raspberrypi.org' Err:2 http://raspbian.raspberrypi.org/raspbian stretch InRelease Temporary failure resolving 'raspbian.raspberrypi.org' Reading package lists... Don...
by 6by9
Mon Nov 12, 2018 4:24 pm
Forum: C/C++
Topic: H264 Encoding: OpenMax or MMAL, which one is the recommended C API?
Replies: 1
Views: 508

Re: H264 Encoding: OpenMax or MMAL, which one is the recommended C API?

Hello all, Having reached the stage in the development of a new Pi-based prototype where all the GPU-accelerated encoding features are working as expected, I don't want to find that my choice of API makes future features either difficult or impossible to implement further down the line. Broadcom's ...
by 6by9
Mon Nov 12, 2018 3:30 pm
Forum: Camera board
Topic: raspistill gives shifted image (in vertical direction) output
Replies: 3
Views: 141

Re: raspistill gives shifted image (in vertical direction) output

There's a known issue with the settings in mode 5 on the OV5647 - the vertical offset is defined incorrectly. The still captures are always taken using the full 5MPix mode and downscaled. Fixing mode 5 will affect anyone who has set up their camera to record a 16:9 image using mode 5 (ie 720P or sma...
by 6by9
Mon Nov 12, 2018 12:47 pm
Forum: General discussion
Topic: DIY POE?
Replies: 32
Views: 1408

Re: DIY POE?

I don't know what that circuit is supposed to do in the context of PoE. Might work for condenser microphones but with those 6.8k resistors there is no way it can provide sufficient power for a piece of equipment using ethernet. That looks like a fairly standard audio phantom power supply (ie inject...
by 6by9
Mon Nov 12, 2018 9:39 am
Forum: Advanced users
Topic: Upgrading a FiveNinja Slice with a Compute Module 3
Replies: 1
Views: 74

Re: Upgrading a FiveNinja Slice with a Compute Module 3

As long as the OS has been updated to support it, then yes you can do a straight swap out. I'm fairly certain LibreElec has various users of the Slice, although I'm not sure whether it has all the kernel tweaks for the LEDs. Use the Compute Module 3 (NOT Lite) as the Slice does not have the required...
by 6by9
Sun Nov 11, 2018 8:58 am
Forum: Camera board
Topic: ISP output 1 ? (vc.ril.isp:out:1)
Replies: 3
Views: 106

Re: ISP output 1 ? (vc.ril.isp:out:1)

It is in the docs - https://github.com/raspberrypi/firmware/blob/master/documentation/ilcomponents/isp.html (I'll make another request to get that lot hosted on raspberrypi.org. http://www.jvcref.com/files/PI/documentation/ilcomponents/ is a hosted version but quite out of date). updates! I just up...
by 6by9
Sat Nov 10, 2018 6:26 pm
Forum: Off topic discussion
Topic: Cortex-A72 compared to Pi 3B+
Replies: 23
Views: 708

Re: Cortex-A72 compared to Pi 3B+

I've never used a big.LITTLE architecture system. I wonder how the scheduler decides which type of core for each process. With a lot of complexity! There were also two alternative modes of operation for big.LITTLE - either have a matched number of big and little cores and migrate all processes to t...
by 6by9
Fri Nov 09, 2018 5:19 pm
Forum: OpenMAX
Topic: How tunnel of openmax work?
Replies: 16
Views: 401

Re: How tunnel of openmax work?

I achieved decode video but just I can see display, I couldn't audio. I did ffmpeg process for audio and I converted from .mp4 file to .aac file. Openmax can decoding to .aac file with 'OMX_AUDIO_CodingAAC'. I try doing decode audio but I don't know what will result. I don't sure both video and aud...
by 6by9
Fri Nov 09, 2018 5:11 pm
Forum: Graphics programming
Topic: Video decoder output port info
Replies: 3
Views: 101

Re: Video decoder output port info

longo92 wrote:
Fri Nov 09, 2018 2:09 pm
But the question is: why the opaque encoding is not listed as a supported encoding in the output port?
It's a quirk of the handling. All the pixel formats are probed via one parameter, opaque would have to be detected via another.
I might see if I can add it for completeness.
by 6by9
Fri Nov 09, 2018 11:24 am
Forum: Device Tree
Topic: Attaching Display to the Compute Module IO Board by the DISP0 [solved]
Replies: 10
Views: 1422

Re: Attaching Display to the Compute Module IO Board by the DISP0

aBUGSworstnightmare wrote:
Fri Nov 09, 2018 11:15 am
That means we can now eiter use DSI0 or DSI1 on custom design with Compute Module? Good to know!
Yes, should be able to.
by 6by9
Fri Nov 09, 2018 11:12 am
Forum: Camera board
Topic: ISP output 1 ? (vc.ril.isp:out:1)
Replies: 3
Views: 106

Re: ISP output 1 ? (vc.ril.isp:out:1)

It is in the docs - https://github.com/raspberrypi/firmware/blob/master/documentation/ilcomponents/isp.html (I'll make another request to get that lot hosted on raspberrypi.org. http://www.jvcref.com/files/PI/documentation/ilcomponents/ is a hosted version but quite out of date). This component wrap...

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