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by jamesh
Mon Jun 21, 2021 8:11 am
Forum: General discussion
Topic: Is Purchasing Pi Zero in Larger #'s Possible?
Replies: 12
Views: 400

Re: Is Purchasing Pi Zero in Larger #'s Possible?

Yes, I should have said the Pi WH above, as the device that is available off the shelf in quantity. However, for large enough orders you can also buy the Pi0 and Pi0W direct from us. Note the price WILL be more than the listed educational price per unit, but not a huge amount more for the Pi0W. Cont...
by jamesh
Mon Jun 21, 2021 8:07 am
Forum: Raspberry Pi 400
Topic: Pi400 Sub Par Keyboard
Replies: 4
Views: 128

Re: Pi400 Sub Par Keyboard

We are aware of an issue with some keyboards, the test regime has already been improved, and other mitigations are in progress. So, yes, we are "on the double". Do people really believe that we just sit on reports like this and do nothing? Just because you cannot see things happening, does...
by jamesh
Mon Jun 21, 2021 7:56 am
Forum: C/C++
Topic: atomic or volatile, that is the question ( Whether 'tis nobler in the mind to mutex them)
Replies: 72
Views: 1761

Re: atomic or volatile, that is the question ( Whether 'tis nobler in the mind to mutex them)

dsyleixa123 wrote:
Mon Jun 21, 2021 7:02 am
yes, I see, that's why I wrote I'll abandon atomic for C++: too weird and too muddled up for my skills.
Robust multithreaded code is difficult. C++'s implementation is not weird, or muddled up, it's just a complex subject requiring a complex solution.
by jamesh
Mon Jun 21, 2021 7:46 am
Forum: Advanced users
Topic: Maximum stable overclocking speed of a Pi 4 or 400
Replies: 50
Views: 1693

Re: Maximum stable overclocking speed of a Pi 4 or 400

The Cm4 doesn't have the size of the Pi4, and cannot cool as effectively, so you might need extra cooling.
by jamesh
Sun Jun 20, 2021 7:32 pm
Forum: Raspberry Pi 400
Topic: Pi400 Sub Par Keyboard
Replies: 4
Views: 128

Re: Pi400 Sub Par Keyboard

Hi, We don't actually have tech support phone number, so that's why you won't be able to get through. As for the Pi400 issue, this is clearly a HW fault, and should be returned to the supplier. James Hughes Raspberry Pi engineer. (Hopefully that should be good enough for Amazon, although note that w...
by jamesh
Sun Jun 20, 2021 7:22 pm
Forum: Advanced users
Topic: Maximum stable overclocking speed of a Pi 4 or 400
Replies: 50
Views: 1693

Re: Maximum stable overclocking speed of a Pi 4 or 400

So, I've just spent the last hour seeing what OC I can get on a CM4. results are shocking compared to what some are getting on a RPI4. I can NOT go past 2300. I'm sat at 2250 with an over_voltage of 12. If I increase the 2275 and over_voltage above 13, it never boots into the OS. I ran a stress tes...
by jamesh
Sun Jun 20, 2021 7:21 pm
Forum: General
Topic: How would you add more ADCs to the Raspberry Pi Pico?
Replies: 27
Views: 827

Re: How would you add more ADCs to the Raspberry Pi Pico?

We've spent some time analysing the ADC, and a report has been written up, I have no idea of its publications status, but will try and find out.
by jamesh
Sun Jun 20, 2021 7:37 am
Forum: General discussion
Topic: Is Purchasing Pi Zero in Larger #'s Possible?
Replies: 12
Views: 400

Re: Is Purchasing Pi Zero in Larger #'s Possible?

You should be able to buy the wireless version in bulk, or email info@RaspberryPi.com with you needs and it will be passed onto sales.
by jamesh
Sat Jun 19, 2021 12:23 pm
Forum: Advanced users
Topic: Maximum stable overclocking speed of a Pi 4 or 400
Replies: 50
Views: 1693

Re: Maximum stable overclocking speed of a Pi 4 or 400

Many overclockers seem to be pushing more than 2GHz. Yep. CM4: 2250000 2250000 2250000 2250000 RPI4B: 1900000 1900000 1900000 1900000 Both are stable under a stress test. How do I find out the PCB revision? REV 1.0 isn't the same, right? https://www.raspberrypi.org/documentation/hardware/raspberryp...
by jamesh
Sat Jun 19, 2021 9:57 am
Forum: Troubleshooting
Topic: Low voltage warning message text
Replies: 47
Views: 22190

Re: Low voltage warning message text

Reading the many threads on this subject, I am surprised at the litany of "get a good power supply" where it is considered unthinkable that the message and the lightning bolt could just possibly be due to something else than the power supply. My Pi3B developed this annoying behaviour. I r...
by jamesh
Fri Jun 18, 2021 7:09 pm
Forum: Raspberry Pi OS
Topic: Raspberry PI OS 64-bit Release Date
Replies: 61
Views: 35451

Re: Raspberry PI OS 64-bit Release Date

I can't believe the 64-bit version is still not available for General Release. Why? It's a massive job making everything work as well as it does in 32bit, involving new camera stack, new graphics stack, new LCD drivers and the rest. And since 32bit works fine for the vast majority of people, it's n...
by jamesh
Fri Jun 18, 2021 7:05 pm
Forum: General discussion
Topic: MicroSD card failures after 6months or so.
Replies: 7
Views: 354

Re: MicroSD card failures after 6months or so.

We've always been aware of the lifetime of SD cards - it's a well known thing. The trade-off is ease of use, vs limited lifetime. There are lots of instructions around the web on how to reduce SD card accesses in order to improve lifetimes. One way is simply using a larger card, the cards inbuild we...
by jamesh
Fri Jun 18, 2021 4:44 pm
Forum: Troubleshooting
Topic: does rainbow screen flicker hint at a poor power supply?
Replies: 8
Views: 247

Re: does rainbow screen flicker hint at a poor power supply?

The chances of getting a Pi with exactly the same fault as a previous one are incredibly remote, so if this one starts doing the same as the other one, I would suspect something else, especially since washed out colours in not a fault I have heard of before. HDMI cable, the monitor itself would be t...
by jamesh
Fri Jun 18, 2021 4:23 pm
Forum: Official Foundation Display
Topic: How to switch initial brightness?
Replies: 5
Views: 153

Re: How to switch initial brightness?

No, it's controlled from a I2C message to the display board on the screen, via the firmware and some mailboxes.

If you are using KMS (unlikely) then you could mod the driver to start up with 0 brightness.
by jamesh
Fri Jun 18, 2021 4:22 pm
Forum: Troubleshooting
Topic: does rainbow screen flicker hint at a poor power supply?
Replies: 8
Views: 247

Re: does rainbow screen flicker hint at a poor power supply?

I hadn't realised it recovered after the flicker on the rainbow. Probably it's all OK then if everything works after that.
by jamesh
Fri Jun 18, 2021 4:21 pm
Forum: Official Foundation Display
Topic: Glass pulling away from frame
Replies: 4
Views: 192

Re: Glass pulling away from frame

Hi, we would like to get some of these back for examination. Can you email info@raspberrypi.com FAO James Hughes with your details, and someone will get in touch.

Thanks.
by jamesh
Fri Jun 18, 2021 3:33 pm
Forum: Advanced users
Topic: Maximum stable overclocking speed of a Pi 4 or 400
Replies: 50
Views: 1693

Re: Maximum stable overclocking speed of a Pi 4 or 400

Has anyone on this forum managed to get 2.4GHz (or higher) with their units and if so, has it been stable under heavy real-world loads? 2.4 GHz on RPi4B and 2.5 GHz on CM4, but with sub-zero temperatures. On the RPi4B 2.4 GHz was stable under heavy load (3+ hours x264 encoding) and the CM4 was able...
by jamesh
Fri Jun 18, 2021 3:32 pm
Forum: Official Foundation Display
Topic: Glass pulling away from frame
Replies: 4
Views: 192

Re: Glass pulling away from frame

I have passed this on.
by jamesh
Fri Jun 18, 2021 2:53 pm
Forum: Official Foundation Display
Topic: How to switch initial brightness?
Replies: 5
Views: 153

Re: How to switch initial brightness?

Not that I can think of.
by jamesh
Fri Jun 18, 2021 2:22 pm
Forum: Networking and servers
Topic: Connect in places without internet
Replies: 3
Views: 147

Re: Connect in places without internet

Mobile network? Satellite internet (e.g. starlink)? LoRA? Wifi?
by jamesh
Fri Jun 18, 2021 1:00 pm
Forum: Troubleshooting
Topic: does rainbow screen flicker hint at a poor power supply?
Replies: 8
Views: 247

Re: does rainbow screen flicker hint at a poor power supply?

I'd be more worried about the HDMI cable.
by jamesh
Fri Jun 18, 2021 9:49 am
Forum: Wanted
Topic: Hiring for consultation and more
Replies: 2
Views: 173

Re: Hiring for consultation and more

We have a number of design partners you may wish to contact one of them.

https://www.raspberrypi.org/for-industr ... -partners/
by jamesh
Fri Jun 18, 2021 9:44 am
Forum: C/C++
Topic: atomic or volatile, that is the question ( Whether 'tis nobler in the mind to mutex them)
Replies: 72
Views: 1761

Re: atomic or volatile, that is the question ( Whether 'tis nobler in the mind to mutex them)

well, I am using multithreading successfully since 10 years and more, all is fine (using volatile + mutexes + thread prios) - I only need to understand atomic which had been suggested, and answers should be suitable for non-professionals, finally the Pi is also for beginners. The answers given by t...
by jamesh
Fri Jun 18, 2021 9:01 am
Forum: C/C++
Topic: atomic or volatile, that is the question ( Whether 'tis nobler in the mind to mutex them)
Replies: 72
Views: 1761

Re: atomic or volatile, that is the question ( Whether 'tis nobler in the mind to mutex them)

I don't understand those technical documents and manuals https://stackoverflow.com/questions/81656/where-do-i-find-the-current-c-or-c-standard-documents - 99.9999% is exaggerated unspecific and verbose talk in technical terms and terminologies overloaded and overwhelmed with unnecessary and ambiguo...
by jamesh
Fri Jun 18, 2021 7:25 am
Forum: General
Topic: Raspberry Pi Pico
Replies: 8
Views: 311

Re: Raspberry Pi Pico

Still do not see much value in it outside education due to RAM and IO limits Good enough reason to do it :lol: Pimoroni should make a motherboard for these, 4x4 array? https://shop.pimoroni.com/products/pga2040 Stackable so they can stack 4 high, 3D Pico bramble, 128 x ARM CPUs. Keeping the serial ...

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