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by Gavinmc42
Fri Sep 17, 2021 6:30 am
Forum: General discussion
Topic: Keyboard case for a Raspberry Pi 4
Replies: 17
Views: 462

Re: Keyboard case for a Raspberry Pi 4

If you find some guys will to do it, please let the rest of us know. There seems to be a few around. For a price, for example. https://lasergist.com/laser-cut-custom-keyboards/ I looked at 14 x14 mm hole punches that could do 1.6mm aluminum or steel. DIY 14 x14mm broaching tool in a drill press, go...
by Gavinmc42
Fri Sep 17, 2021 12:44 am
Forum: General discussion
Topic: Keyboard case for a Raspberry Pi 4
Replies: 17
Views: 462

Re: Keyboard case for a Raspberry Pi 4

It would be really, really, nice if someone came out with a product that was a good mechanical keyboard with a CM4 slot inside. Ethernet jack and USB- C power, USB2 hub, Pico for keyboard scanning, PCIe NVMe slot. Two full size HDMI, RTC, what else? "a" product, just one version? 78 keys ...
by Gavinmc42
Wed Sep 15, 2021 11:02 am
Forum: Graphics, sound and multimedia
Topic: Utilizing Multiple RPIs as Cameras and Hub
Replies: 4
Views: 278

Re: Utilizing Multiple RPIs as Cameras and Hub

MotionEye OS can use webcams.
I got a dozen of old PS3 Eyecams for $2 each :D
Only 640x480 but bigger pixels so a bit better in low light but with more noise.
by Gavinmc42
Wed Sep 15, 2021 8:40 am
Forum: SDK
Topic: Bidirectional I2C communications for a split keyboard
Replies: 3
Views: 120

Re: Bidirectional I2C communications for a split keyboard

Nice keyboard.
Haven't seen that keyboard layout website before.
Thinking something like the Atreus is for me.

Anyone sell keyboard hole punches?
Got lots of 1.5mm brass sheet lying around.

I am looking at using those keyswitch connectors so they can be swapped without resoldering.
by Gavinmc42
Wed Sep 15, 2021 6:51 am
Forum: Other projects
Topic: How can I do AR?
Replies: 4
Views: 196

Re: How can I do AR?

There is some AR/VR stuff showing up in VulkanSceneGraph https://vsg-dev.github.io/VulkanSceneGraph/ It will mostly compile in 32 and 64Bit Raspberry Pi OS with some tweaking. Vulkan is a bit faster than OpenGL even on Pi's. But I am waiting for the Pi VK drivers to be 1.1 compliant and stop vanishi...
by Gavinmc42
Wed Sep 15, 2021 5:14 am
Forum: Other projects
Topic: How can I do AR?
Replies: 4
Views: 196

Re: How can I do AR?

Did they have a PI based reference version?
https://www.khronos.org/OpenXR/

Or was that for vision?
https://www.khronos.org/openvx/
by Gavinmc42
Wed Sep 15, 2021 4:54 am
Forum: Beginners
Topic: What is pi capable of
Replies: 3
Views: 211

Re: What is pi capable of

Those apps don't need high resolution. Even 320x240 might be enough. Arducam have a bunch of cameras down to SPI ones even a Pico can use. 2 x CSI cameras and 6 SPI cams? Even more if you use their CSI mux boards. Libcamera now has a detect app, might be a place to start. https://github.com/raspberr...
by Gavinmc42
Wed Sep 15, 2021 4:48 am
Forum: Camera board
Topic: detecting camera without firmware stack
Replies: 18
Views: 447

Re: detecting camera without firmware stack

Just noticed the mode .h files. Limited number of modes for imx477? Or this just for basic settings and the other modes are DIY? Baremetal setup by just copying those register settings. Where is that hiding in the Libcamera stuff? Libcamera now has a new detect app. Libcamera is for 64bit Pis, so th...
by Gavinmc42
Wed Sep 15, 2021 3:40 am
Forum: Advanced users
Topic: Dual boot on SD Card
Replies: 39
Views: 716

Re: Dual boot on SD Card

those conditionals also work in the under-documented autoboot.txt file Autoboot, never heard of it. ;) Very interesting . bootcode.bin and autoboot.txt must live on the 1st fat32 partition, but no other files are needed Pi4's only need autoboot.txt? 2nd, 3rd partitions should be 256MB fats? Will it...
by Gavinmc42
Wed Sep 15, 2021 2:49 am
Forum: OpenVG
Topic: OpenVG 1.1 Lite
Replies: 0
Views: 69

OpenVG 1.1 Lite

https://www.khronos.org/news/press/khronos-group-releases-openvg-1.1-lite-bring-high-quality-vector-graphics-to-opengl-es-2.0-compatible-gpus I really like using OpenVG on VC4 Pi's. Will we see OpenVG 1.1 Lite support for VC6 Pi4s? OpenVG support was pulled from Mesa 3D, so will it come back via Mes...
by Gavinmc42
Wed Sep 15, 2021 1:22 am
Forum: Java
Topic: Raspberry Pi 4, program made in Java is very laggy.
Replies: 2
Views: 163

Re: Raspberry Pi 4, program made in Java is very laggy.

Probably software rendering? I stopped using Java after they dropped support for JavaFX and the Pi's "GPU" acceleration. Not sure of the current state of Java and Acceleration support. Processing on PC's is cool but is best with accelerated video. Edit - Looks like hardware support for Pi4...
by Gavinmc42
Tue Sep 14, 2021 9:15 am
Forum: Advanced users
Topic: Dual boot on SD Card
Replies: 39
Views: 716

Re: Dual boot on SD Card

There is also the GPIO conditional filters in config.txt https://www.raspberrypi.org/documentation/computers/config_txt.html#the-gpio-filter. You could put a switch on a GPIO pin. If pulled high on boot then it runs one Kernel/OS. If switched to gnd then it runs the other OS. 2 x GPIO pins gives you...
by Gavinmc42
Tue Sep 14, 2021 7:53 am
Forum: Compute Module
Topic: CM4 has what OS preinstalled? Where download images?
Replies: 6
Views: 222

Re: CM4 has what OS preinstalled? Where download images?

You might be thinking of the bootloader which is put into the Eeprom. You will get a display but that is not Linux. You will need the USBboot utilities to program the eMMC. You can USBboot into the MSD mode then use RPI Imager to burn a OS image to the USD(eMMC). https://github.com/raspberrypi/usbbo...
by Gavinmc42
Tue Sep 14, 2021 3:32 am
Forum: Compute Module
Topic: Will CM5 has the same form factor as CM4?
Replies: 14
Views: 446

Re: Will CM5 has the same form factor as CM4?

CM4 dual-connector style, could easily be upgraded to a triple or quad connector format Sounds like a good idea but PCB routing that design would be challenging. No hurry, still got lot of learning to do on the old Pi's. Pi5/Pi500 will be first, that will give a better idea of what the CM5 features...
by Gavinmc42
Tue Sep 14, 2021 2:40 am
Forum: Compute Module
Topic: Will CM5 has the same form factor as CM4?
Replies: 14
Views: 446

Re: Will CM5 has the same form factor as CM4?

The PCIe interface and dual HDMI and other things needed more pins.
What extras are likely in a Pi5 SoC that adds even more pins?


Edit - I think Eben said Pi5 SoC spec is pretty much locked in now anyway.
They might even have some prototype ones by now?
by Gavinmc42
Tue Sep 14, 2021 2:37 am
Forum: General programming discussion
Topic: css with Geany
Replies: 2
Views: 184

Re: css with Geany

Code: Select all

href="./style.css"
Probably a path name issue.
Might need to put the full path name in below the index.html folder.
by Gavinmc42
Tue Sep 14, 2021 1:39 am
Forum: Compute Module
Topic: Will CM5 has the same form factor as CM4?
Replies: 14
Views: 446

Re: Will CM5 has the same form factor as CM4?

At a guess NO.

But with 32 versions of the CM4, there may be a similar range for the CM5.
There might be a CM4 footprint version and a CM5+ version with more "stuff".
64 versions? :lol:
by Gavinmc42
Tue Sep 14, 2021 1:35 am
Forum: General discussion
Topic: Raspberry wont boot with external harddrive
Replies: 20
Views: 845

Re: Raspberry wont boot with external harddrive

Externally powered HDD caddy will be needed.
Less current available on the Pi3's via USB port and HDD (spinning) need more current than SSDs.

I have used externally powered 3.5" HDD for years 24/7 even on old PiB+.
But to boot a 3 from USB HDD is trickier as they also take time to spin up.
by Gavinmc42
Mon Sep 13, 2021 2:39 am
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

from this channel, i have seen that PCR machines can be pretty expensive, so there is definitely a market for DIY ones and plans for making them more cheaply It took me six years but I ended up with a Zero controlled PCR that I am told works better than a $80,000 one ;) The tech has moved on and a ...
by Gavinmc42
Mon Sep 13, 2021 1:16 am
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

but linux can boot in the background, and deal with the wifi uplink and cloud style features Good idea. Linux does have that stuff sorted. The VPUs are running a ThreadX app. Replace that with a LK one? I prefer Open firmware all around. QEMU for VPU is looking more useful. I checked years ago the ...
by Gavinmc42
Sun Sep 12, 2021 11:09 am
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

but the hardware can go as low as 8bpp RGB332 images Of course, the obvious, 256 colours. Plenty enough for Info slides. Been using 32bit with Alpha till now. Going to have to think about that some more, not sure if it will be needed. 3 second boot time is probably going to be fast enough for slide...
by Gavinmc42
Sun Sep 12, 2021 8:55 am
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

it now takes only ~3 seconds to show the first image, and ~4 seconds to load them all That's more like it :D Try it on a Zero at full speed? Didn't know LK did images, that explains those tga files. Tweaking from now on might save fractions of seconds. Hardware JPEG decoding, there is the HelloPi J...
by Gavinmc42
Sun Sep 12, 2021 2:07 am
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

Filesystem seems to work :D
Nearly there, image file reader and render to FB next?
by Gavinmc42
Sun Sep 12, 2021 12:07 am
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

i could very easily throw together a signage example, just load an array of images from disk, and cycle thru them Did that 3? years ago, did not know all the tricks back then. 8 secs per images was as fast as I could cycle. Loading the images into ram and swapping them in and out etc. Other tricks ...
by Gavinmc42
Sat Sep 11, 2021 1:00 pm
Forum: Bare metal, Assembly language
Topic: open firmware and booting custom apps fast
Replies: 42
Views: 1553

Re: open firmware and booting custom apps fast

Probably the use of the eeprom bootloader has slowed it down. Boot order need tweaking sometimes. Variations between the CM4's too, uSD or eMMC etc I read the commits for eeprom bootloader, mostly for NVMe but I did see some delays removed recently. Will need to figure out the CM4 boot speeds soon....

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