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by jamesh
Tue Jul 17, 2018 4:26 pm
Forum: Compute Module
Topic: What would be the next step up from CM3?
Replies: 29
Views: 1181

Re: What would be the next step up from CM3?

Ah I see so it was semi-flex / flex rigid I would be after. Wanted to do exactly what semi-flex does but didn't know the name for it so was thinking of using edge connectors atleast for connecting the extra PCBs to my design (looking at creating a design that could be worn like glasses). I knew you...
by jamesh
Tue Jul 17, 2018 4:22 pm
Forum: Troubleshooting
Topic: Wifi freeze
Replies: 2
Views: 62

Re: Wifi freeze

I presume you are using latest Rasbian?
by jamesh
Tue Jul 17, 2018 4:21 pm
Forum: Beginners
Topic: raspberrypi zero w raspbian omxplayer
Replies: 3
Views: 56

Re: raspberrypi zero w raspbian omxplayer

omxplayer output appears on the device attached to the HDMI port on the Pi itself, not over VNC - that's a remote desktop sytem, and the video does not appear on the desktop - its superimposed on the HDMMI output.
by jamesh
Tue Jul 17, 2018 3:01 pm
Forum: Beginners
Topic: raspberrypi zero w raspbian omxplayer
Replies: 3
Views: 56

Re: raspberrypi zero w raspbian omxplayer

Are you connected to a HDMI display, or using VNC?
by jamesh
Tue Jul 17, 2018 2:59 pm
Forum: General programming discussion
Topic: What Does Hiding the Details of I/O in Library Calls Teach?
Replies: 19
Views: 307

Re: What Does Hiding the Details of I/O in Library Calls Teach?

This is down to the teaching, not the libraries. If you want to teach low level register stuff, you get your students to write the library itself. They can use the existing code as a example, replicate, modify etc. AFter all, a huge amount of SW engineering nowadays is looking at others code and fix...
by jamesh
Tue Jul 17, 2018 9:39 am
Forum: Add-ons
Topic: Hardware Specification of the RPi's
Replies: 22
Views: 461

Re: Hardware Specification of the RPi's

He's the one that has been doing a lot of work getting the documentation updated and improved, especially with input form the forum (forum is in his personal time iirc) He one of the Engineers sat in the office. I do quite a bit of forum stuff behind my desk as well as at home, on the train, in bed...
by jamesh
Tue Jul 17, 2018 9:26 am
Forum: Troubleshooting
Topic: Raspi b+ slower than raspi B on image convert
Replies: 2
Views: 55

Re: Raspi b+ slower than raspi B on image convert

Presuming the 3B+ rather than the B+.

So if you take the SD card fomrthe B+ and put it in the B this shows the issue? So exactly the same version of ImageMagick is being used, in fact exactly the same everything?
by jamesh
Tue Jul 17, 2018 9:21 am
Forum: Raspbian
Topic: About Raspbian distribution
Replies: 1
Views: 63

Re: About Raspbian distribution

You can release Raspian with your software, but you MUST, on demand, provide access to the source of any GPL parts, which includes the Linux kernel itself. Since you are using a standard kernel, you could just link to our repo. So really, as long as your software does not use any GPL libraries, you ...
by jamesh
Tue Jul 17, 2018 9:18 am
Forum: Beginners
Topic: Windows 10 - Pi3B+ ----- SOLVED
Replies: 8
Views: 439

Re: Windows 10 - Pi3B+ ----- SOLVED

Hmm, does sounds like we need a comprehensive section on Samba shares in the docs. Shouldn't be that difficult to do, but although the Linux side is fairly simpy, sorting out the permission on the Windows side is a PITA, but tbh, I'm not a Windows expert any more! There is this from the MagPi. https...
by jamesh
Tue Jul 17, 2018 9:16 am
Forum: Compute Module
Topic: What would be the next step up from CM3?
Replies: 29
Views: 1181

Re: What would be the next step up from CM3?

If you want to develop a prototype, the CM3 is the best way to do this. I assume you've already developed and tested your system on a Pi3 and optimised it? If not I'd start there, optimising the software is the best way of getting to the next step. With software improvements, you can usually get fa...
by jamesh
Tue Jul 17, 2018 9:05 am
Forum: Add-ons
Topic: Hardware Specification of the RPi's
Replies: 22
Views: 461

Re: Hardware Specification of the RPi's

Recomended power supply is 5v 2.5A at the board. The official power supply is actually 5.1v to compensate for voltage drop over the supply cable. If in doubt, buy the reasonably priced official power supply. It's always worth noting that we have sold MILLIONS of devices in to commercial or industri...
by jamesh
Mon Jul 16, 2018 10:13 am
Forum: General discussion
Topic: New firmware for the official wireless dongle
Replies: 4
Views: 213

Re: New firmware for the official wireless dongle

Ah, C&P from the previous post, annoying it knackers those. Thanks for the heads up. Should now be fixed.
by jamesh
Mon Jul 16, 2018 10:13 am
Forum: Advanced users
Topic: What would the max frequency of a C program be?
Replies: 4
Views: 160

Re: What would the max frequency of a C program be?

Do you mean the maximum frequency you can run a GPIO at? Not the max frequency that the CPU running the C program is going at?
by jamesh
Mon Jul 16, 2018 9:58 am
Forum: Add-ons
Topic: Hardware Specification of the RPi's
Replies: 22
Views: 461

Re: Hardware Specification of the RPi's

Recomended power supply is 5v 2.5A at the board. The official power supply is actually 5.1v to compensate for voltage drop over the supply cable. If in doubt, buy the reasonably priced official power supply. It's always worth noting that we have sold MILLIONS of devices in to commercial or industria...
by jamesh
Mon Jul 16, 2018 9:52 am
Forum: General discussion
Topic: Announcements
Replies: 33
Views: 17584

Re: New firmware for the Raspberry Pi Wireless Dongle

We have a new beta release of wireless dongle firmware. This is for anyone using this dongle https://www.raspberrypi.org/products/raspberry-pi-usb-wifi-dongle/ This file linked below needs to be copied to the /lib/firmware/brcm folder. You may wish to backup the existing file of the same name just ...
by jamesh
Mon Jul 16, 2018 9:51 am
Forum: General discussion
Topic: New firmware for the official wireless dongle
Replies: 4
Views: 213

New firmware for the official wireless dongle

We have a new beta release of wireless dongle firmware. This is for anyone using this dongle https://www.raspberrypi.org/products/raspberry-pi-usb-wifi-dongle/ This file linked below needs to be copied to the /lib/firmware/brcm folder. You may wish to backup the existing file of the same name just i...
by jamesh
Sun Jul 15, 2018 7:36 pm
Forum: Add-ons
Topic: Hardware Specification of the RPi's
Replies: 22
Views: 461

Re: Hardware Specification of the RPi's

Me!
by jamesh
Sun Jul 15, 2018 7:34 pm
Forum: General discussion
Topic: RPi 3B+ gigabit ethernet bad download speeds.
Replies: 173
Views: 18654

Re: RPi 3B+ gigabit ethernet bad download speeds.

Sounds like flow control is not turned on on your router, that will cause these results.
by jamesh
Sat Jul 14, 2018 8:50 am
Forum: Beginners
Topic: how long does it take to get a forum post
Replies: 1
Views: 78

Re: how long does it take to get a forum post

Up to 24hrs depending on day of week and timezone.

Sometimes takes a bit longer.
by jamesh
Fri Jul 13, 2018 1:14 pm
Forum: Advanced users
Topic: Is there a performance penalty to using two byte structs instead of 4?
Replies: 16
Views: 448

Re: Is there a performance penalty to using two byte structs instead of 4?

Cool! I guess similar to C++ templating out liternals.to specific actions.

I guess this is knowledge that the older generation can sometimes not realise; when I started, compilers didn't do this .But suppose when you think about it, its fairly low hanging fruit for optimisation.
by jamesh
Fri Jul 13, 2018 1:11 pm
Forum: Wanted
Topic: Raspberry pi zero (not w or wh), buy several
Replies: 2
Views: 136

Re: Raspberry pi zero (not w or wh), buy several

Please contact [email protected], although I suspect that order quantity will be a little low, might be cheaper just to buy the WH.
by jamesh
Fri Jul 13, 2018 11:30 am
Forum: Advanced users
Topic: Is there a performance penalty to using two byte structs instead of 4?
Replies: 16
Views: 448

Re: Is there a performance penalty to using two byte structs instead of 4?

Seems wasteful to use memcpy for 4bytes. Just cast the pointers to uint32 and write. Avoids the overhead of a function call. Sorry, no its not. @ try.c:39: memcpy(&ups,mvect_buffer+offset,sizeof(struct vector_package)); ldr r3, [r0, #12] There is no function call. Writing things like: *(uint32_t*)p...
by jamesh
Fri Jul 13, 2018 10:54 am
Forum: Troubleshooting
Topic: Rasp 3B+ download speed capped to 63Mbit/s :-/
Replies: 12
Views: 306

Re: Rasp 3B+ download speed capped to 63Mbit/s :-/

Hi, Thanks for your help, I didn't manage to enable Flow control on my R7000 router, however, I learnt that my TP-Link switch (non-managable metal box) manages flow control by default. I tried to connect the Raspberry 3 B+ on it and tadaaaa, from 190 to 220 Mbit/s (stable) :D Cheers A quick Google ...
by jamesh
Fri Jul 13, 2018 10:30 am
Forum: Compute Module
Topic: can a camera share an i2c bus with other devices?
Replies: 6
Views: 251

Re: can a camera share an i2c bus with other devices?

And I've found the naughty step!

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