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by pik33
Tue Jun 25, 2019 1:22 pm
Forum: General
Topic: Raspberry Pi 4 and Ultibo
Replies: 6
Views: 71

Re: Raspberry Pi 4 and Ultibo

All omx stuff and mailbox interface was left intact so the framebuffer should work without a lot of changes The problem with RPi4 boot is its new MMU which has to be set up before all the rest of the stuff can run. To do this one has to know how the new MMU works. Then the Ultibo has to fit in the n...
by pik33
Mon Jun 24, 2019 3:37 pm
Forum: News
Topic: There is a RPi4 on the wild
Replies: 8
Views: 130

Re: There is a RPi4 on the wild

The memory in RPi3 was too slow to display 4k@60fps. Even RPi4 cannot do this on both outputs. The limiting factor is the memory speed. 4k is 8 MPixels = 32 MBytes At 60 fps you need 1.92 GB/s (!)
by pik33
Mon Jun 24, 2019 8:04 am
Forum: News
Topic: There is a RPi4 on the wild
Replies: 8
Views: 130

Re: There is a RPi4 on the wild

I ordered the board. They have them in stock so it can arrive tomorrow. They still didn't make a link to the new OS.
by pik33
Mon Jun 24, 2019 6:19 am
Forum: News
Topic: There is a RPi4 on the wild
Replies: 8
Views: 130

There is a RPi4 on the wild

https://www.raspberrypi.org/blog/raspbe ... w-from-35/

The question is... how much work and time will it get to port Ultibo to this new board...
by pik33
Sun Jun 16, 2019 6:35 pm
Forum: Projects
Topic: Window manager
Replies: 139
Views: 18485

Re: Window manager

To make the project usable, it needs an API defined. The idea is: if you want a program running in the environment, you have to write your unit for the program, which uses "mwindows" The unit has to define a thread for the applet's main loop Then you can register your applet in the system ...
by pik33
Mon May 13, 2019 3:59 pm
Forum: General
Topic: Expansion board for PI
Replies: 3
Views: 219

Re: Expansion board for PI

What is this? Is it a passive board which multiplies every GPIO pin x3 ?
by pik33
Sun May 12, 2019 6:14 am
Forum: General
Topic: Camera, SMI, JPEG
Replies: 17
Views: 1811

Re: Camera, SMI, JPEG

The main problem with SMI is GPIO pins available (or rather not available) in RPi. Only 4 address lines are available on RPi GPIO which makes all this SMI stuff nearly unusable.
by pik33
Fri May 03, 2019 1:39 pm
Forum: Projects
Topic: Datalogger Ultibo/ATmega328p
Replies: 13
Views: 405

Re: Datalogger Ultibo/ATmega328p

A simple correction: PageTableGetEntry needs an integer, not a pointer, so addr:=cardinal(@test); entry:=PageTableGetEntry(addr);

I want to keep passive cooling at all cost


A thing like this will do :)
https://www.raspberrypi.org/forums/view ... p?t=158301
by pik33
Fri May 03, 2019 7:31 am
Forum: Projects
Topic: Datalogger Ultibo/ATmega328p
Replies: 13
Views: 405

Re: Datalogger Ultibo/ATmega328p

does the GPU updates them from memory whatever there was a change on the layer or not? Yes, it does. It reads all layers memory in the real time, so 6 fullHD (1920x1200) layers on overclocked (1400/560/560) RPi3 makes it unusable (my experimental result) due to memory bandwidth used by GPU I'll giv...
by pik33
Tue Apr 30, 2019 10:40 am
Forum: Projects
Topic: Datalogger Ultibo/ATmega328p
Replies: 13
Views: 405

Re: Datalogger Ultibo/ATmega328p

The funny thing is that when you start pushing things on each core with a millisecond maximum cycle time, this becomes the main bottleneck. The memory subsystem is a main bottleneck for RPi. You can overclock it in config.txt up to 600 MHz giving it up to 1.2 G transfers/sec. The same memory is use...

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