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by jamesh
Sun Jan 20, 2019 8:48 am
Forum: Troubleshooting
Topic: Can't figure out what program is starting my PiCam every bootup or how to stop it
Replies: 5
Views: 135

Re: Can't figure out what program is starting my PiCam every bootup or how to stop it

sure it does. remove the vc4 kernel module and mmal quits working, right? so, sudo lsof | grep mmal would probably determine what tasks are using the camera. No, the v4l2 driver uses mmal, but mmal is still there if the V4l2 module isn't loaded. So things like raspistill work without it. And actual...
by jamesh
Sat Jan 19, 2019 12:31 pm
Forum: Troubleshooting
Topic: Can't figure out what program is starting my PiCam every bootup or how to stop it
Replies: 5
Views: 135

Re: Can't figure out what program is starting my PiCam every bootup or how to stop it

don't know off the top of my head what drivers feed the camera but if they are not compiled into the kernel then blacklist them so that they don't load. Also, install and use (as root) lsof and search for the /dev/video* devices...assuming the API is using video for linux. The Pi camera when used b...
by jamesh
Sat Jan 19, 2019 12:22 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: vcgencmd not compiled correctly ? files missing ?
Replies: 1
Views: 53

Re: vcgencmd not compiled correctly ? files missing ?

`vcgencmd` is an app that will only work on a Pi. None of the things it interogates are on a x86 PC.
by jamesh
Fri Jan 18, 2019 5:18 pm
Forum: General discussion
Topic: Obfuscation thread
Replies: 34
Views: 3788

Re: Obfuscation thread

And I think we are done here, cleared thread of some crap, locking.
by jamesh
Fri Jan 18, 2019 5:15 pm
Forum: Troubleshooting
Topic: GPS via USB data gets corrupted if the program loop delay exceeds incoming rate. Is this a TTYUSB0 Cache problem?
Replies: 15
Views: 249

Re: GPS via USB data gets corrupted if the program loop delay exceeds incoming rate. Is this a TTYUSB0 Cache problem?

What Aydan said, althogh I suspect what is happening here that means it will probably work most of the time Messages come in at a paritcular rate, IIRC, from GPS, not particularly quickly , so you get a message, then there is quite a gap till the next one, in comparison to the message send time. whi...
by jamesh
Fri Jan 18, 2019 4:29 pm
Forum: General discussion
Topic: Obfuscation thread
Replies: 34
Views: 3788

Re: Obfuscation thread

I don't quite much agree with all of you. We know offline softwares are all crackable, but the point of obfuscation and other techniques is to make them LESS EASY to crack. If you run a business, making your product harder to reverse engineer gives you an advantage over the product which can be dup...
by jamesh
Fri Jan 18, 2019 3:36 pm
Forum: General discussion
Topic: Convert HDMI out to in and CSI2 in to out
Replies: 8
Views: 443

Re: Redirecting output to stdout

hi everyone! I have some questions please. 1- what does " redirecting all Output to stdoutput means? 2- Is it possible to redirect the CSI2 data lane and clk lane to the GPIO Output from the CM3? 3- is it possible to control a camera with a CM3 (i2c from CM3 connect to i2c from the Kamera) but stor...
by jamesh
Fri Jan 18, 2019 11:10 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Received UART data gets the MSB (sometimes the 2nd MSB) changed to 1
Replies: 2
Views: 84

Re: Received UART data gets the MSB (sometimes the 2nd MSB) changed to 1

Are you running at the correct 3.3v, the Pi doesn't like 5v on the UART?
by jamesh
Fri Jan 18, 2019 10:26 am
Forum: General discussion
Topic: Too Many Pis
Replies: 5
Views: 262

Re: Too Many Pis

I haven't been following developments for the last few years, since I bought a couple of pi2 soon after release. I now want to purchase another Pi but am a bit bewildered by the available choices. Has anyone constructed a matrix showing the features of each available model? The answer is almost alw...
by jamesh
Fri Jan 18, 2019 10:22 am
Forum: Camera board
Topic: 2 new options for raspivid
Replies: 11
Views: 275

Re: 2 new options for raspivid

The one place you may gain is over a low bandwidth link, where you can start sending the data a couple of ms earlier, and get the decoder started a similar few ms sooner. I htink the latency advantage is that even if only decoding one slice at a time, you can be decoding earlier slices whilst later...
by jamesh
Fri Jan 18, 2019 8:32 am
Forum: C/C++
Topic: fb mailbox access in order to double-buffer
Replies: 4
Views: 149

Re: fb mailbox access in order to double-buffer

I'd be inclined to do my own FB handling of double buffering, and copy your FB to the actual FB at the frame rate. I htnk ther is the ability to sync on vsync somewhere.

I suspect that changing the FB via the mailbox calls will be a bit slow. But worth trying.
by jamesh
Fri Jan 18, 2019 8:30 am
Forum: Troubleshooting
Topic: Rpi3 hangs after 3 hours
Replies: 11
Views: 208

Re: Rpi3 hangs after 3 hours

SteMMo wrote:
Thu Jan 17, 2019 2:09 pm
There are a mouse, keyboard, webcam and touch-controller.

Do you need the syslog file?
Rremove the webcam. Does the Pi work for longer.

And as Dougie says, you probably need to upgrade to a more recent system.
by jamesh
Fri Jan 18, 2019 8:25 am
Forum: Camera board
Topic: 2 new options for raspivid
Replies: 11
Views: 275

Re: 2 new options for raspivid

As above, spstimings is a hint to the decoder as to the framerate, using the actual timestamps is far more accurate. Slices can only reduce latency in some circumstances. It won't give a big gain if decoding via any hardware acceleration (eg a Pi) as you won't have a second hw block to decode the s...
by jamesh
Thu Jan 17, 2019 9:04 pm
Forum: Troubleshooting
Topic: URGENT: Raspberry Pi 3B Fails to Connect to HDMI Monitor
Replies: 5
Views: 111

Re: URGENT: Raspberry Pi 3B Fails to Connect to HDMI Monitor

What do you mean by USB? You are trying to boot from a USB memory stick?

Have you tried to boot normally using an imaged SD card first?
by jamesh
Thu Jan 17, 2019 9:01 pm
Forum: Camera board
Topic: 2 new options for raspivid
Replies: 11
Views: 275

Re: 2 new options for raspivid

I just want to add the use cases for the options. -stm: if you put the created h264 file into a container with programs like MP4Box, ffmpeg or gstreamer, the program can read the frame rate from the h264 file and it can set the right frame rate for the output automatically. This is kind of useful a...
by jamesh
Thu Jan 17, 2019 8:58 pm
Forum: General discussion
Topic: How to contact moderator directly?
Replies: 15
Views: 423

Re: How to contact moderator directly?

Right, that's enough mad tin foil hat paranoia.

Please don't bring up this subject again.
by jamesh
Thu Jan 17, 2019 5:13 pm
Forum: General discussion
Topic: How to contact moderator directly?
Replies: 15
Views: 423

Re: How to contact moderator directly?

If it is an issue with the recently closed Zero RAM on startup thread, that one had run its course, there was really nothing else to say on it. We had had at least three reports on it asking for it to be closed. The Pi isn't sold as a secure system, and we have no plans to make it secure to the ext...
by jamesh
Thu Jan 17, 2019 2:50 pm
Forum: General discussion
Topic: How to contact moderator directly?
Replies: 15
Views: 423

Re: How to contact moderator directly?

Best to email [email protected].org. PM's are disabled, and we don't spread email addresses around willy nilly. If it is an issue with the recently closed Zero RAM on startup thread, that one had run its course, there was really nothing else to say on it. We had had at least three reports on it askin...
by jamesh
Thu Jan 17, 2019 1:38 pm
Forum: Beginners
Topic: VNC from Kano
Replies: 3
Views: 854

Re: VNC from Kano

I have the VNC app which is currently included in the latest KANO OS 4.2. However, when i access my raspberry pi 3b+ from my laptop only the clouds in KANO OS background are present, no apps or desktop. Could anyone suggest any obvious mistakes i may be making? It would be much better to start a ne...
by jamesh
Thu Jan 17, 2019 1:35 pm
Forum: Troubleshooting
Topic: Rpi3 hangs after 3 hours
Replies: 11
Views: 208

Re: Rpi3 hangs after 3 hours

@jamesh: would it be possible to include the status of the undervoltage flags into the kernel oops report? This might make things easier for debugging USB faults due to undervoltage. I think that would require Raspberry Pi specific changes to the upstream kernel oops code, and we are always very re...
by jamesh
Thu Jan 17, 2019 12:48 pm
Forum: Troubleshooting
Topic: Rpi3 hangs after 3 hours
Replies: 11
Views: 208

Re: Rpi3 hangs after 3 hours

Can you specify exactly what HW you have attached to the Pi? There's an error in there about UVC, which I think is to do with webcams?
by jamesh
Thu Jan 17, 2019 10:36 am
Forum: General discussion
Topic: Possibility of Raspberry pi crash when just powering off instead of shutting down.
Replies: 19
Views: 439

Re: Possibility of Raspberry pi crash

maybe becaue the hardware is low quality? I broke three of them in a month. Just sayin. pulled the sd carrier off two units because SD sticks out too far when inserted. and the third suffers from the "proprietary VC4" bootcode.bin mystery. won't do DHCP netboot requests anymore, even after cold pow...
by jamesh
Thu Jan 17, 2019 9:55 am
Forum: General discussion
Topic: Possibility of Raspberry pi crash when just powering off instead of shutting down.
Replies: 19
Views: 439

Re: Possibility of Raspberry pi crash

Can you explain how we have sold millions of devices in to embedded devices and people still keep coming back and buying more of them for exactly that? I mean, literally, 50k at a time type of sales... The HW can do it, you just tune the software for your particular use case. I've been an embedded S...
by jamesh
Wed Jan 16, 2019 8:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Linux ioctl SPI "discussion" - anybody?
Replies: 10
Views: 231

Re: Linux ioctl SPI "discussion" - anybody?

HW can be weird, often needing some sort of odd sequence to kick it in to life after boot up. Maybe that its, just soime dummy bytes whilst its gets itself going.

Who knows? And posting source code does make this sort of thing easier, having a disucssion without examples can be painful.
by jamesh
Wed Jan 16, 2019 8:51 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2346

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

and its so easy to circumvent it's not going to increase security overmuch. Can you tell me how easy it is to circument when you have glued the SD-Card and a shake sensor. Shakesensor leads to key erase after noticing shake. This little peace of hardware will cost in total much below 5 $. I'll buil...

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