Go to advanced search

by jamesh
Sat Jul 24, 2021 3:10 pm
Forum: General discussion
Topic: Rpi4 - 8gb raspios 32bit - laggy, low fps, tearing video streaming.
Replies: 7
Views: 208

Re: Rpi4 - 8gb raspios 32bit - laggy, low fps, tearing video streaming.

So amazon firetv stick is powerful than rpi4? Or poor software compatibility? Also is there any android os with hardware acceleration?? The Fire stick has a faster data path from the wireless to the HW, which can be highly optimised, so you don't need a huge amount of processing power. On the Pi, y...
by jamesh
Sat Jul 24, 2021 2:27 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

Trading are a Linux shop... Trading is not your market. Think about your users. We understand the you are understaffed, but this these days is the reality in any team, including in much larger companies. The way to deal with it is to work smart, levering of the enormous set of software products, fr...
by jamesh
Sat Jul 24, 2021 1:59 pm
Forum: SDK
Topic: CMSIS
Replies: 8
Views: 721

Re: CMSIS

I think its is easy to measure a real MCU company by checking how the company had understood the IP they had invested money into. In the todays world, hardware is just one pice. The other bigger portion of IP is software. If you implement a ARM Cortex M core IP into a product and you did not unders...
by jamesh
Sat Jul 24, 2021 1:46 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

It would be very interesting to know what proportion of uController software engineers use Linux vs Windows vs Mac, and what the trend is towards. I moved from Windows to Linux (although still use Windows on my work laptop, but work mainly in Linux in a VM) about 10-15years ago, although the VC4 deb...
by jamesh
Sat Jul 24, 2021 11:28 am
Forum: Troubleshooting
Topic: Issue with Latest Hardware Revision 1.4 for 4B boards
Replies: 15
Views: 720

Re: Issue with Latest Hardware Revision 1.4 for 4B boards

I am having issues with the 4B 1.4 in that LibreElec 9.2 just doesn't boot on it. I've tried copying start.elf and fixup.dat from the github zip file, but now the green LED blinks 4 times slowly and then 4 times rapidly; and the Pi doesn't boot. https://www.raspberrypi.org/documentation/configurati...
by jamesh
Sat Jul 24, 2021 8:31 am
Forum: Troubleshooting
Topic: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.
Replies: 17
Views: 524

Re: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.

If the problem goes away with 32, just use that. I doubt we will spend any time trying to find out the problem and its likely unfixable anyway, as it seems changes to the firmware need a bit more memory, and changes care there for a reason.
by jamesh
Fri Jul 23, 2021 2:31 pm
Forum: Troubleshooting
Topic: Pi 4 cannot support a 4094x2400@30Hz display well
Replies: 1
Views: 71

Re: Pi 4 cannot support a 4094x2400@30Hz display well

That is a bit more than 4k, its possible that we don't support a resolution that high. I'll check. I wonder if enabled 4kp60 in config.txt will help, might be an insufficiently high clock.

edit: Had a quick look at the firmware, there is no 4096x2400 mode in there. Might work under KMS.
by jamesh
Fri Jul 23, 2021 2:30 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

Would my suggestion that "Windows" provides a substandard uController development environment go down well at this point? ;-) It comes down to the fact that we are a Linux shop, always have been. Sorting out a seamless Windows installation process is out of our bailiwick. Over time I am su...
by jamesh
Fri Jul 23, 2021 1:50 pm
Forum: Troubleshooting
Topic: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.
Replies: 17
Views: 524

Re: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.

It's unclear whether that was with gpu_mem=16 or 32, or default.
by jamesh
Fri Jul 23, 2021 10:53 am
Forum: Camera board
Topic: Bit depth of JPEG and PNG Images From PiCam v2.1?
Replies: 6
Views: 172

Re: Bit depth of JPEG and PNG Images From PiCam v2.1?

That gives you the size of the data portion of the file, but PNG has a header, which may be a set numbers of bytes, you will need to look that up and add it to the total.
by jamesh
Fri Jul 23, 2021 10:52 am
Forum: General discussion
Topic: Can you install a graphics card into any kind of raspberry pi (rpi3 etc.)
Replies: 10
Views: 486

Re: Can you install a graphics card into any kind of raspberry pi (rpi3 etc.)

Video cards with the Raspberry Pi? The nvidia-driver software package in the Debian repository does have support for ARMHF computers. I'm not sure what hardware would be supported by the nvidia-driver software with ARM computers. Same with the AMD graphics drivers, the xserver-xorg-video-amdgpu sof...
by jamesh
Fri Jul 23, 2021 10:51 am
Forum: Advanced users
Topic: Lost HDMI1 ouput on 10% of Pi4Bs
Replies: 2
Views: 121

Re: Lost HDMI1 ouput on 10% of Pi4Bs

Hmm, that's an odd one. Got a few questions;

1. Are they behaving in all other respects?
2. Have you made any updates or similar on them recently?
3. Does running a standard Raspberry Pi OS image on a new SD card work OK?
by jamesh
Thu Jul 22, 2021 4:05 pm
Forum: General discussion
Topic: What is RPi 3 Bluetooth ID / passcode ?
Replies: 6
Views: 201

Re: What is RPi 3 Bluetooth ID / passcode ?

Not sure we set one? 0000?
by jamesh
Thu Jul 22, 2021 4:03 pm
Forum: Troubleshooting
Topic: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.
Replies: 17
Views: 524

Re: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.

I expect a firmware change somewhere has used up a tiny bit more memory and pushed it over the edge, although it does depend on what features of the firmware you are using. What things are you getting the Pi to do that might involve firmware memory usage (camera, multiple screens, codec usage etc).
by jamesh
Thu Jul 22, 2021 1:51 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

@AllOfThePiCrew You realize of course, despite a few minor warts, that your stuff is pretty damned impressive! ;) Been saying that all along! It's just that people don't believe me! I only had a minor* part in development but I think it's great. * I did the Doxygen, some of the examples, a few litt...
by jamesh
Thu Jul 22, 2021 1:47 pm
Forum: General discussion
Topic: Plug in monitor HDMI cable after boot up
Replies: 4
Views: 153

Re: Plug in monitor HDMI cable after boot up

The very latest KMS driver (the ARM side system rather than using the firmware) should support HDMI hotplugging. To try it out, update config.txt. Find the line dtoverlay=vc4-fkms-v3d and amend it to dtoverlay=vc4-kms-v3d This is still code in beta, so make sure everything you need to work is still ...
by jamesh
Thu Jul 22, 2021 1:28 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

I find this odd. The amount of CMake you need to know is about 5 lines worth (and we are working to get those 5 lines better documented). I really is not lot of effort, but clearly there is some work need to explain it. I'm not complaining -- I'm merely reporting my observations. The CMake system w...
by jamesh
Thu Jul 22, 2021 1:03 pm
Forum: General discussion
Topic: MSOffice on a Pi-400
Replies: 75
Views: 2303

Re: MSOffice on a Pi-400

bjtheone wrote:
Thu Jul 22, 2021 12:59 pm
Beyond being rather anti Microsoft, I an very unenthused about single vendor lock in.
Which we try to avoid, and having an MS OS available, along with Office, increases the number of vendors. It not like we (Or anyone else) would stop providing Linux if Windows became available!
by jamesh
Thu Jul 22, 2021 12:59 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

Mindset dictates success, as Henry Ford said: "Whether you think you can, or you think you can't – you're right." Sounds like new-age nonsense. English has a saying to convey just about anything... doesn't make it true. Henry Ford (July 30, 1863 – April 7, 1947) Somewhat before "New ...
by jamesh
Thu Jul 22, 2021 12:31 pm
Forum: General discussion
Topic: What is that?
Replies: 16
Views: 569

Re: What is that?

We don't make a laptop!
by jamesh
Thu Jul 22, 2021 12:07 pm
Forum: General
Topic: Pi Pico - the most user un-friendly MCU?
Replies: 231
Views: 6396

Re: Pi Pico - the most user un-friendly MCU?

But we can't expect to be spoon-fed for every single thing that comes up. It's not only hugely inefficient in terms of lag, but you never get to know what the range of functionality is and thereby run the risk of missing some incredibly useful piece of functionality. In my day-job, I deal every day...
by jamesh
Thu Jul 22, 2021 10:56 am
Forum: General discussion
Topic: MSOffice on a Pi-400
Replies: 75
Views: 2303

Re: MSOffice on a Pi-400

Don't forget that the users on this forum are a tiny subset of total Pi users. It's a bit of an echo chamber, in that people most likely to post a lot on here are more likely to be anti-MS, so I don't think its a safe extrapolation to apply the same to the general Pi populace.
by jamesh
Thu Jul 22, 2021 9:15 am
Forum: Troubleshooting
Topic: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.
Replies: 17
Views: 524

Re: gpu_mem=16 in /boot/config.txt causes bus-errors, panics etc.

I suspect the firmware is simply running out of memory. I'd stick it at 32 instead, losing 16MB won't make a huge difference.
by jamesh
Thu Jul 22, 2021 9:06 am
Forum: General discussion
Topic: MSOffice on a Pi-400
Replies: 75
Views: 2303

Re: MSOffice on a Pi-400

But whether MS see any advantage in allowing this remains to be seen. They have a far larger ARM market - the Apple M1 - to deal with at the moment. Larger, yes, but I'm not so sure about "far larger". So far as i know, Apple's share of the PC/laptop market has been hovering around 10%. W...
by jamesh
Thu Jul 22, 2021 9:02 am
Forum: General discussion
Topic: Pi 400 case
Replies: 11
Views: 436

Re: Pi 400 case

The higher default clock is because of that stiffener plate/heat sink. I thought it was partially because of the plate/Heatsink. The Pi400 received a C0 stepping revision that the pi4b did not get. https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=314313&p=1880810#p1880597 Has it alre...

Go to advanced search