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by Gavinmc42
Mon Oct 18, 2021 6:40 am
Forum: Graphics programming
Topic: All about accelerated video on the Raspberry Pi (check my notes)?
Replies: 27
Views: 2778

Re: All about accelerated video on the Raspberry Pi (check my notes)?

5 pixel valves, but only 3 channels on the HVS that generates image data so you must select a max of 3 PV's from the set of 5 with more work on the linux drivers, it may be possible to solve that So possible for 3 displays in baremetal? The VC4's had HDMI or VEC, not both at the same time. Somehow ...
by Gavinmc42
Mon Oct 18, 2021 6:09 am
Forum: Graphics programming
Topic: All about accelerated video on the Raspberry Pi (check my notes)?
Replies: 27
Views: 2778

Re: All about accelerated video on the Raspberry Pi (check my notes)?

https://github.com/librerpi/rpi-open-fi ... ipeline.md And the other files in that directory VC6 pi's have 5 pixelvalves: PV0 can drive DSI0/DPI PV1 can drive DSI1/SMI PV2 can drive HDMI0 PV3 can drive VEC PV4 can drive HDMI1 That tends to indicate a Pi4 can do two HDMI and composite at the same ti...
by Gavinmc42
Mon Oct 18, 2021 4:48 am
Forum: Teaching and learning resources
Topic: Super-cheap Computing Cluster for Learning
Replies: 71
Views: 62661

Re: Super-cheap Computing Cluster for Learning

A 42U rack = 672 x CM4 = 2688 CPU's. 10KW of power for how many MIPs? Cheap Super Cluster, not a Super Cheap Cluster :roll: Net boot them all to Ram, no flash? Use the cheapest CM4 without eMMC. No NVM, they cost money too ;) But if the learning to be done on this system is security of storage.........
by Gavinmc42
Mon Oct 18, 2021 4:25 am
Forum: Advanced users
Topic: PI4 measure the power consumption of arm processor
Replies: 2
Views: 57

Re: PI4 measure the power consumption of arm processor

U2 is the main power supply chip, U3 is a smaller one.
U2 has an A to D converter, AN1, AN2 but only one is used for power detection.
There is no current measuring electronics in the Pi4.

An external current measuring system will measure the entire PCB power consumption not just the Arm part.
by Gavinmc42
Mon Oct 18, 2021 3:28 am
Forum: Teaching and learning resources
Topic: Super-cheap Computing Cluster for Learning
Replies: 71
Views: 62661

Re: Super-cheap Computing Cluster for Learning

The Blade is for a 1U rack with a POE Switch powering it.
16 Blades in a single 1U rack :D
https://www.jeffgeerling.com/tags/uptime-lab

Getting enough/any might be any issue.

A cluster of RN2040s with Hyper ram/Flash might be fun without serious wallet damage.
by Gavinmc42
Mon Oct 18, 2021 2:13 am
Forum: Graphics programming
Topic: All about accelerated video on the Raspberry Pi (check my notes)?
Replies: 27
Views: 2778

Re: All about accelerated video on the Raspberry Pi (check my notes)?

Been a while since I checked, AV1 looks to be the Codec many are using/going to use.
Is dav1d the fastest decoder?
https://code.videolan.org/videolan/dav1d
Optimized C and assembler for the various Arm chips Pi use :D

Will it compile on a Pi?
by Gavinmc42
Mon Oct 18, 2021 1:19 am
Forum: Teaching and learning resources
Topic: Super-cheap Computing Cluster for Learning
Replies: 71
Views: 62661

Re: Super-cheap Computing Cluster for Learning

Have you seen Jeff Geerling's CM4 Pi Blade server/cluster?
Not sure I could justify that to my finance manager just for "learning"
I guess "Super cheap" has different meanings depending on budget ;)

A cluster of RN2040's is within my budget ;)
by Gavinmc42
Mon Oct 18, 2021 1:11 am
Forum: Graphics programming
Topic: All about accelerated video on the Raspberry Pi (check my notes)?
Replies: 27
Views: 2778

Re: All about accelerated video on the Raspberry Pi (check my notes)?

I don't think anyone has done a Pi4 accelerated decoding video player yet. Most are mods of existing apps like VLC which uses fffmpeg which uses LibAV..... The older VC4 Pi's have been done but are using the built-in H.264 decoder. Simple demo, https://github.com/Gavinmc42/AV-Player How to do that w...
by Gavinmc42
Fri Oct 15, 2021 1:36 am
Forum: Other projects
Topic: Using 80×64 Heimann thermal camera sensor with raspberry Pi 4
Replies: 1
Views: 108

Re: Using 80×64 Heimann thermal camera sensor with raspberry Pi 4

Cool sensor, had not seen them before.
3V3 and 6 wire SPI, should be easy to use.
Electrically they are a direct connection to the Pi GPIO pins.

Software is the harder bit.
by Gavinmc42
Thu Oct 14, 2021 11:44 pm
Forum: General
Topic: Finding 18MB of RAM
Replies: 19
Views: 710

Re: Finding 18MB of RAM

yeah, if PIO is generating all of the HyperBUS signals, it should be fine And then we need someone to make RP2040 boards with that BGA chip on it ;) Hmm, anyone makes a HyperBus NN/ML/AI coprocessor? Two PIO, two Hyperbus interfaces? Pushes Picos into a serious memory range area for big IoT gadgets...
by Gavinmc42
Thu Oct 14, 2021 11:25 pm
Forum: Off topic discussion
Topic: Car chip shortage, and RP 2040?
Replies: 43
Views: 2059

Re: Car chip shortage, and RP 2040?

open pilot? MIght need to paint some lines on your lawn though. Wonder if the Comma AI is better than the Kia one? Most robot mowers use a perimeter wire. Ok if you have a nice neat lawn, not so good if you have the road works equivalent backyard :lol: Some places will need a chainsaw attachment. B...
by Gavinmc42
Thu Oct 14, 2021 11:18 pm
Forum: Compute Module
Topic: does new compute module 4 have unformatted eMMC, and will not show up as a drive
Replies: 13
Views: 581

Re: does new compute module 4 have unformatted eMMC, and will not show up as a drive

Since I have a USB drive with Raspberry OS, why couldn't I similarly boot the CM4 from my USB drive with Raspberry OS in the CM4 IO board USB A socket? Not sure which version of bootloader you have and if it still works My first one was around Sep2020 from memory. If the bootloader does not find a ...
by Gavinmc42
Thu Oct 14, 2021 6:50 am
Forum: Compute Module
Topic: does new compute module 4 have unformatted eMMC, and will not show up as a drive
Replies: 13
Views: 581

Re: does new compute module 4 have unformatted eMMC, and will not show up as a drive

I have used USBboot on a Pi400, it seems pretty reliable so far. https://github.com/raspberrypi/usbboot The first time with a blank eMMC CM4 I booted from a USB stick with Raspberry OS in the CM4 IO board USB A socket. It was a bit slow to boot, but the OS did allow me to use Imager to write the bla...
by Gavinmc42
Thu Oct 14, 2021 6:39 am
Forum: Off topic discussion
Topic: Car chip shortage, and RP 2040?
Replies: 43
Views: 2059

Re: Car chip shortage, and RP 2040?

Were you able to turn it off? No, I gladly handed it back to the rental place and picked up my 4 year old clunker from the repair shop. Plenty of YTs from Kia showing off their fancy new capabilities. Plenty of forum posts from Kia owners complaining about this feature. Regulating away personal res...
by Gavinmc42
Thu Oct 14, 2021 2:09 am
Forum: General
Topic: Finding 18MB of RAM
Replies: 19
Views: 710

Re: Finding 18MB of RAM

but it looks like HyperBUS instead uses a dedicated clock line, and sends data on both the rising and falling edge
Pi4 Bitbang it or add a flip flop?
No idea, which means more learning :lol:

Would be cool if this gets working on Pico.
Adding some highspeed RAM would be useful.
by Gavinmc42
Thu Oct 14, 2021 1:57 am
Forum: Off topic discussion
Topic: Car chip shortage, and RP 2040?
Replies: 43
Views: 2059

Re: Car chip shortage, and RP 2040?

https://www.autocar.co.uk/opinion/tester%E2%80%99s-notes/matt-prior-why-lane-keeping-assist-systems-need-rethink Plenty of YTs and posts from Kia owners about lanekeeper being default to on. Euro NCAP regulations for the world. Doesn't work on the rubbish secondary roads we have in Oz. Fighting that...
by Gavinmc42
Thu Oct 14, 2021 1:42 am
Forum: Off topic discussion
Topic: Car chip shortage, and RP 2040?
Replies: 43
Views: 2059

Re: Car chip shortage, and RP 2040?

Never would have known about this feature unless I had a new car as a rental.
https://en.wikipedia.org/wiki/Lane_depa ... ing_system

I did think it would be easier if they had better markings on the roads.
Expect QR codes on roads near you soon?
by Gavinmc42
Thu Oct 14, 2021 1:17 am
Forum: General
Topic: Finding 18MB of RAM
Replies: 19
Views: 710

Re: Finding 18MB of RAM

Well someone needs to make hyperbus on rp2040 so...wish me luck, I'm GOING IN
Goodluck.
Perhaps start with SPI mode to test the hardware.
Wonder if SMI mode on the Pi4 could fake it enough to work?

Have not played with HyperBUS, more learning to do :lol:
by Gavinmc42
Thu Oct 14, 2021 1:05 am
Forum: Off topic discussion
Topic: Car chip shortage, and RP 2040?
Replies: 43
Views: 2059

Re: Car chip shortage, and RP 2040?

My Kia Niro EV has that. It took a while to get used to it, but it doesn't half enhance safety. There is a button to disable it, as it's not useful in roadworks where you have to cross the white lines. The rental I had was a Kia Sportage and lots of roadworks in my neighborhood. Sounds like Kia hav...
by Gavinmc42
Wed Oct 13, 2021 2:33 am
Forum: General
Topic: Finding 18MB of RAM
Replies: 19
Views: 710

Re: Finding 18MB of RAM

Can a PIO be programmed to do Hyperbus? Could be a useful standard capability in future parts too. There are Hyperbus Ram, flash and combos parts around. From the overclocking capability of the existing RP2040 chip, CPU speeds are getting into those ranges. Implications for low cost digital signage ...
by Gavinmc42
Wed Oct 13, 2021 1:46 am
Forum: General discussion
Topic: About the New Raspberry Pi 4b cpu revision
Replies: 35
Views: 1458

Re: About the New Raspberry Pi 4b cpu revision

yeah, then you have the problem of drivers assuming coherency, and being closed source, so you cant even fix the driver! How much is closed? https://nouveau.freedesktop.org/ For AMD this looks interesting. https://gpuopen.com/amd-open-source-driver-for-vulkan/ Once the BCM2711/VC6 has Vulkan 1.2 dr...
by Gavinmc42
Wed Oct 13, 2021 1:22 am
Forum: Off topic discussion
Topic: Car chip shortage, and RP 2040?
Replies: 43
Views: 2059

Re: Car chip shortage, and RP 2040?

My first car, had no mats, no heater, vacuum wipers & rod brakes, why do we need 'chips' at all........ Job security? Just had a new hire car for a week while mine was in the shop. Some weird beeping and weird steering handling. Turned out there was a lane keeping/warning function built into th...
by Gavinmc42
Tue Oct 12, 2021 7:50 am
Forum: General discussion
Topic: why some posts are locked with unknown reason?
Replies: 12
Views: 667

Re: why some posts are locked with unknown reason?

Wow, many locked.
Perhaps it happened when the forum post server got moved to raspberrypi.com?
by Gavinmc42
Tue Oct 12, 2021 6:04 am
Forum: General discussion
Topic: why some posts are locked with unknown reason?
Replies: 12
Views: 667

Re: why some posts are locked with unknown reason?

Mostly locked because someone got silly or everything has been said and nothing more to add.
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