Go to advanced search

by jamesh
Wed Jan 23, 2019 10:25 am
Forum: General discussion
Topic: Features for future Pi, voltage/current reporting.
Replies: 49
Views: 887

Re: Features for future Pi, voltage/current reporting.

So you are expecting someone else to bear the R&D cost ? for this must have feature which is so badly needed that in 7 years no one has actually asked for ! I did not say it was badly needed, I said 1. It would be a good feature (gave couple of reasons why) 2. This post was a suggestion 3. Since th...
by jamesh
Tue Jan 22, 2019 4:47 pm
Forum: General discussion
Topic: Power Supply - Radio Interference
Replies: 11
Views: 214

Re: Power Supply - Radio Interference

Afternoon all, Progress of a sort. Here's what's been tested. - Use portable power bank instead of PSU: Reduced interference to a manageable level - Are other AM radios affected in proximity to Pi: No - Encase PSU in metal case: No difference but have not yet tried with earth wire connected - Use g...
by jamesh
Tue Jan 22, 2019 3:43 pm
Forum: Advanced users
Topic: Boot Raspberry Pi 3 from USB
Replies: 1
Views: 54

Re: Boot Raspberry Pi 3 from USB

Unles the Lubuntu image you are using was specifically built for the Raspberry Pi, and I suspect it wasn't and is simply a x86 version, then it will not work. It must be built for ARM and it must have the require Raspberry Pi firmware and extensions. Use one of our images from our downloaded page an...
by jamesh
Tue Jan 22, 2019 2:01 pm
Forum: General discussion
Topic: Features for future Pi, voltage/current reporting.
Replies: 49
Views: 887

Re: Features for future Pi? (suggestion)

The MxL7704 PMIC doesn't report its voltage input, but it does have two unused ADC inputs, one of which could perhaps be used to monitor the voltage input. That might be zero-cost except for the cost of tracking so maybe something to bear in mind for future generations of Pi if they use the same PM...
by jamesh
Tue Jan 22, 2019 1:42 pm
Forum: General discussion
Topic: Features for future Pi, voltage/current reporting.
Replies: 49
Views: 887

Re: Features for future Pi, voltage/current reporting.

For example (assuming this was built in from the start), lets say about 1% of people *need* this, but it costs $1 in extra parts, which is added to every Pi. 20M sold means $20M extra spent. But on 200k people who actually want the feature, so that means we spent $100 for each of those people. Whic...
by jamesh
Tue Jan 22, 2019 1:12 pm
Forum: Raspbian
Topic: vcgencmd get_throttled
Replies: 5
Views: 845

Re: vcgencmd get_throttled

Ah, yes, I've just updated the PR (in fact done a new one) so my link above no longer works.
by jamesh
Tue Jan 22, 2019 1:06 pm
Forum: General discussion
Topic: Features for future Pi, voltage/current reporting.
Replies: 49
Views: 887

Re: Features for future Pi, voltage/current reporting.

Of course, these are all things that could be done using additional equipment, and in most cases, they are measurements you're only likely to do a few times, per project. So actually, the overall cost benefit analysis would show that it's much cheaper for those that need these measurements to buy th...
by jamesh
Tue Jan 22, 2019 10:55 am
Forum: Off topic discussion
Topic: Academic Survey - Solar Raspberry Pi
Replies: 1
Views: 103

Re: Academic Survey - Solar Raspberry Pi

Before anyone else flags this, I've checked the linked websites, and they seem valid, so post is staying up. Deciding whether to fill in the survey is down to the reader.
by jamesh
Tue Jan 22, 2019 9:55 am
Forum: Other projects
Topic: RaspiTouch
Replies: 2
Views: 56

Re: RaspiTouch

When posting links to pics, its probably better to posting to an image hosting site that doesn't require a login, then link here. Not everyone has a FB account.
by jamesh
Tue Jan 22, 2019 9:52 am
Forum: Troubleshooting
Topic: CM3 dual cam MMAL out of resource at high resolution
Replies: 1
Views: 29

Re: CM3 dual cam MMAL out of resource at high resolution

Have you recently upgraded the OS?
by jamesh
Mon Jan 21, 2019 4:27 pm
Forum: General discussion
Topic: Unclear on throttling
Replies: 9
Views: 156

Re: Unclear on throttling

Close, but 80008 Hex translates to 1000 0000 0000 0000 1000 binary as you say, but that means bit 3 is 1 - I don't know what that means, and bit 19 is 1 which means "Soft Temp limit has occurred". Nothing about power throttling (if I've go that right). Bit 3 is soft temp limit currently active; I'v...
by jamesh
Mon Jan 21, 2019 3:05 pm
Forum: General discussion
Topic: Unclear on throttling
Replies: 9
Views: 156

Re: Unclear on throttling

There's some preliminary documentation for vcgencmd here that explains what the command does

https://github.com/raspberrypi/document ... cgencmd.md
by jamesh
Mon Jan 21, 2019 3:01 pm
Forum: General discussion
Topic: Features for future Pi, voltage/current reporting.
Replies: 49
Views: 887

Re: Features for future Pi? (suggestion)

It might be possible to access the PMIC to get the voltage coming in, but we already have the system automatically being told if it is undervolted - that is what drivers the lightning bolt/message log entries. (It's a single 'I'm undervolted' line) Ah I forgot about that. Is it possible to show the...
by jamesh
Mon Jan 21, 2019 2:56 pm
Forum: General discussion
Topic: Features for future Pi, voltage/current reporting.
Replies: 49
Views: 887

Re: Features for future Pi? (suggestion)

It might be possible to access the PMIC to get the voltage coming in, but we already have the system automatically being told if it is undervolted - that is what drivers the lightning bolt/message log entries. (It's a single 'I'm undervolted' line) Current measurement would be quite difficult, would...
by jamesh
Mon Jan 21, 2019 1:57 pm
Forum: Troubleshooting
Topic: Involuntary shutdown - RBP3B+
Replies: 9
Views: 140

Re: Involuntary shutdown - RBP3B+

Might be time to attach a monitor to see what is going on. Going to be difficult otherwise. One thing you might try, log in using ssh then run `dmesg -w` and see if anything is put in the log there - it displays entries that come in in real time. Isn't vcgencmd get_throttled supposed to show someth...
by jamesh
Mon Jan 21, 2019 12:45 pm
Forum: Troubleshooting
Topic: Involuntary shutdown - RBP3B+
Replies: 9
Views: 140

Re: Involuntary shutdown - RBP3B+

Might be time to attach a monitor to see what is going on. Going to be difficult otherwise.

One thing you might try, log in using ssh then run `dmesg -w` and see if anything is put in the log there - it displays entries that come in in real time.
by jamesh
Mon Jan 21, 2019 11:43 am
Forum: General discussion
Topic: STICKY: Making your own custom burn-n-boot Raspbian image
Replies: 10
Views: 356

Re: Making your own custom burn-n-boot Raspbian image

jahboater wrote:
Mon Jan 21, 2019 10:46 am
Helpful posts HawaiianPi and Sakaki, thanks.
Should be in a sticky!
Done. Probably best to avoid posting in the thread unless really needed, just to keep it on topic.
by jamesh
Mon Jan 21, 2019 11:42 am
Forum: Troubleshooting
Topic: Involuntary shutdown - RBP3B+
Replies: 9
Views: 140

Re: Involuntary shutdown - RBP3B+

So, does the Pi work fine with the motors detached? That would clearly indicate a power issue. Are you getting any lighting bolt symbol, or undervoltage warnings in the log just prior to shutdown?
by jamesh
Mon Jan 21, 2019 10:31 am
Forum: Troubleshooting
Topic: set wrong video mode, no display
Replies: 7
Views: 121

Re: set wrong video mode, no display

Success. I connected the good monitor and just re-installed. Then set lower resolution, I forget which. Maybe 1024 x 768 or such? The TV/monitor didn't like it much, but sort-of-worked, and I set to 800x600, and rebooted. It shows that ok. I finally nosed around to understand the partitioning. Natu...
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: 6
Views: 176

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: 6
Views: 176

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: 2
Views: 77

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: 3799

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: 18
Views: 294

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: 3799

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...

Go to advanced search