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by jpers
Tue May 07, 2019 12:42 pm
Forum: General discussion
Topic: Eltechs ExaGear Desktop will be discontinued on Feb.28'th 2019
Replies: 22
Views: 10124

Re: Eltechs ExaGear Desktop will be discontinued on Feb.28'th 2019

They did not make enough money? Same old proprietary software problem. My speculation. If I read descriptions of ExaGear correctly, they took QEMU and Wine, optimized them, DRMed the whole package and sold it for $27. I bet this was gross violation of QEMU license, which is essentially GPL V2. http...
by jpers
Thu Jul 05, 2018 7:50 pm
Forum: Compute Module
Topic: Are lightning bolt and overheat indicators enabled in CM3?
Replies: 3
Views: 811

Re: Are lightning bolt and overheat indicators enabled in CM3?

vcgencmd can only measure the voltages within the SoC, which are all generated by your carrier board. The low voltage LED and lightning bolt are detecting the 5V rail dropping below USB specs, and that rail never actually enters the SoC. Ok, fair enough (thanks for the explanation). Given that ligh...
by jpers
Thu Jul 05, 2018 9:51 am
Forum: Compute Module
Topic: Are lightning bolt and overheat indicators enabled in CM3?
Replies: 3
Views: 811

Are lightning bolt and overheat indicators enabled in CM3?

Hello everyone, I've just assembled the prototype device, consisting of Computing Module 3 Lite, CM3 development kit, 2 cameras, LiPo battery pack with china-made regulator (set to 5.15V). During the testing using HDMI monitor II was kinda surprised that there was not one instance where lightning bo...
by jpers
Fri Jul 14, 2017 4:01 pm
Forum: Other projects
Topic: Open source USB DMX-512 with RDM (Enttec USB Pro protocol)
Replies: 12
Views: 8738

Re: Open source USB DMX-512 with RDM (Enttec USB Pro protoco

Hello, I plan to use this board as DMX controller, but not as a bare-bones solution - we will run multiple processes on the board, just one of them will control the DMX-enabled light. Is that possible (and is there any documentation about how to access the parallel interface to send DMX commands)? R...
by jpers
Fri Jun 30, 2017 7:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: One wire w1-gpio and w1-gpio-custom
Replies: 70
Views: 81549

Re: One wire w1-gpio and w1-gpio-custom

Thanks @fishfinger! :D I've used your code stub to compile a patched 3.12.21 kernel implementing four 1-w busmasters. For those interested, I've uploaded the patch file here http://holyhead.de/RaspberryPi/bcm2708-multiple_w-1.patch-3.12.21.txt . hi... Can you explain step by step how can i have mor...
by jpers
Wed Apr 05, 2017 6:48 am
Forum: Advanced users
Topic: ROI and metering
Replies: 7
Views: 1279

Re: ROI and metering

Crop is actually done as part of the high res resize almost right at the of the pipe, so the stats block is seeing the whole image. It does appear, however, that at least auto gain and exposure control is taking in the crop region details when computing metering areas - anything cropped off will th...
by jpers
Mon Apr 03, 2017 7:21 pm
Forum: Advanced users
Topic: ROI and metering
Replies: 7
Views: 1279

Re: ROI and metering

It does appear, however, that at least auto gain and exposure control is taking in the crop region details when computing metering areas - anything cropped off will therefore be ignored for metering purposes. I can't see a similar compensation being applied for auto white balance though. Thanks. We...
by jpers
Mon Apr 03, 2017 4:25 pm
Forum: Advanced users
Topic: ROI and metering
Replies: 7
Views: 1279

Re: ROI and metering

My vague recollection is that the crop is done fairly early on in the process, by the CSI peripheral, so the metering is done on the crop not the whole image, but for real confirmation you will need to wait! Thanks! Fingers crossed that that turns out to be true, it will solve a major problem we ha...
by jpers
Mon Apr 03, 2017 2:36 pm
Forum: Advanced users
Topic: ROI and metering
Replies: 7
Views: 1279

Re: ROI and metering

Latest version OpenCV 3.2.0. But the better one is Deep Learning a) Yes b) Yes Using houghLineS, but not houghlinesP What? My question has nothing to do with OpenCV, deep learning, or Hough transform. I simply want to know how metering algorithms work when ROI is set (e.g. raspivid --roi). Janez.
by jpers
Sat Apr 01, 2017 6:14 pm
Forum: Advanced users
Topic: ROI and metering
Replies: 7
Views: 1279

ROI and metering

How does metering algorithm (algorithms) behave when the "roi" option specifies only a part of the image to read?

a) does it work on the whole image, and ROI is applied as a last step?
b) does it measure the inputs only on the ROI (assuming then that ROI is the first step)?

Thanks,

Janez.
by jpers
Wed Mar 01, 2017 5:42 pm
Forum: Advanced users
Topic: Will this simple patch enable raspivid to record raw RGB?
Replies: 2
Views: 800

Re: Will this simple patch enable raspivid to record raw RGB

Your proposed change won't work as the video_encode component has no codec for RGB24 as it isn't a compressed format. However the job has already been done for you with commit https://github.com/raspberrypi/userland/commit/95b306cca4fda67dd341870437dc290d113d934c RaspiVid: Add raw (YUV420, RGB or g...
by jpers
Wed Mar 01, 2017 7:25 am
Forum: General discussion
Topic: Getting Kinect V2 to work with Pi
Replies: 10
Views: 31368

Re: Getting Kinect V2 to work with Pi

Now, the posible showstoppers & speculation: 1. Kinect V2 needs isochronous USB transfers. This means predefined latency, and the libraries definitely check for this. The question is whether the *device* checks for the latency? If it does via some kind of mandatory initialization routine, then the ...
by jpers
Tue Feb 28, 2017 2:00 pm
Forum: General discussion
Topic: Getting Kinect V2 to work with Pi
Replies: 10
Views: 31368

Re: Getting Kinect V2 to work with Pi

I know this thread is a bit old, so I will try to elaborate on problem of combining Kinect V2 and Pi. I just set up the Kinect V2 on CentOS PC computer with USB3 ports. I am also salivating at the prospect of having ToF camera for raspberry pi for that price :) First, the bad news: 1. Kinect V2 need...
by jpers
Fri Jan 27, 2017 10:34 am
Forum: Advanced users
Topic: Identifying Raspberry Pi version from MAC or serial number?
Replies: 6
Views: 1778

Re: Identifying Raspberry Pi version from MAC or serial numb

Does cat /proc/cpuinfo give what you want? I use this to tell if a processor is ARM or not - so I don't run pi stuff on my Linux system. Unnecessary for this purpose (and accepting "pi" as valid user is usually dead giveaway :D ). I get all I need from the nmap . For those not familiar, here is an ...
by jpers
Mon Jan 23, 2017 7:20 pm
Forum: Advanced users
Topic: Disable USB ports
Replies: 14
Views: 18323

Re: Disable USB ports

This is not how I remember it, but will check in a few days and report back.
by jpers
Sun Jan 22, 2017 6:53 pm
Forum: Advanced users
Topic: Disable USB ports
Replies: 14
Views: 18323

Re: Disable USB ports

Note that disabling power to the ports is an all or nothing action. You can't disable individual ports. You can, according to the link I posted (I tested the method, it works, but did not observed all the ports, since only one peripheral was attached in my setup). Unless things changed since the po...
by jpers
Sun Jan 22, 2017 6:31 pm
Forum: Advanced users
Topic: Will this simple patch enable raspivid to record raw RGB?
Replies: 2
Views: 800

Will this simple patch enable raspivid to record raw RGB?

Hello, We use Raspberry pi for computer vision / machine vision solutions. We developed our stuff offline using videos recorded using raspivid , but for real-time processing we are using video4linux 2 and gstreamer-1.0 with v4l2 input module. Now I have discovered that the raw video using v4l2 marke...
by jpers
Sun Jan 22, 2017 6:10 pm
Forum: Advanced users
Topic: Disable USB ports
Replies: 14
Views: 18323

Re: Disable USB ports

I know two ways to do this, but I am afraid both of them are incomplete solutions, and perhaps a complete one is not possible, since other peripherals use USB bus (for example, Ethernet). First solution: Cut the power to the ports you do not need. This will effectively disable the use of USB-powered...
by jpers
Thu Jan 19, 2017 3:27 pm
Forum: Advanced users
Topic: Identifying Raspberry Pi version from MAC or serial number?
Replies: 6
Views: 1778

Re: Identifying Raspberry Pi version from MAC or serial numb

If you have 'headless' access to the RPi sufficient to determine the serial number you could equally well interrogate the version information. Not true. Using sudo nmap -v -A network/netmask I can get MAC addresses of the devices present on the network. Pi's serial number can be derived from the MA...
by jpers
Thu Jan 19, 2017 1:44 pm
Forum: Advanced users
Topic: Identifying Raspberry Pi version from MAC or serial number?
Replies: 6
Views: 1778

Identifying Raspberry Pi version from MAC or serial number?

Hello all, is there any consistent serial numbering scheme for different Raspberry Pi models to enable model detection solely from the Raspberry Pi serial number? Serial number is also part of the MAC address (last 6 digits, afaik?), so it would be really helpful for us with different headless devic...
by jpers
Thu Jul 14, 2016 5:50 am
Forum: Troubleshooting
Topic: Slow i2cdetect on one Pi 3 board only!
Replies: 8
Views: 4102

Re: Slow i2cdetect on one Pi 3 board only!

See http://raspberrypi.stackexchange.com/questions/43697/i2cdetect-on-raspberry-pi-kernel-4-1-18-v7-takes-115-seconds which I guess is the same problem. I don't remember seeing a viable reason for the problem. Yes, I am aware of that post, but I confirmed that the same software behaves differently ...
by jpers
Fri Jul 08, 2016 9:23 am
Forum: Troubleshooting
Topic: Slow i2cdetect on one Pi 3 board only!
Replies: 8
Views: 4102

Re: Slow i2cdetect on one Pi 3 board only!

i2cdetect isn't very sophisticated, it fires a I2C command to the interface for each possible address and waits for the reply. So if you have a hardware or kernel driver problem where the I2C bus isn't working then each command will wait for the timeout and that takes a long time. Well, since the d...
by jpers
Thu Jul 07, 2016 11:20 am
Forum: Troubleshooting
Topic: Slow i2cdetect on one Pi 3 board only!
Replies: 8
Views: 4102

Slow i2cdetect on one Pi 3 board only!

Hello, I have the following problem: I found out that PiFace RTC addon did not work on one of the Raspberry Pi 3 boards we are preparing for a client. I used i2cdetect to scan I2c bus, and the scan is very slow (about one second per address, maybe slightly faster). It did not find the RTC. However, ...
by jpers
Thu May 26, 2016 4:52 pm
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 112721

Re: Overlay to remap Pi 3 UART

That's absolutely fine. I have a small correction though - please don't include the "-overlay" in the dtoverlay directive. It isn't guaranteed to work in the future. Hello Phil, Is there an "official" minimalistic guide how to revert Pi 3 to Pi 2 functionality regarding UART (I know all about the r...

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