rPi 3 : Dual display SPI LCD and HDMI

Hi.

I’d like to know if it’s possible to draw on the piLCD screen and the HDMI screen simultaneously (but not the same thing) ?

The Raspberry pi 3 hardware can do that. The job has been partially done under linux
https://www.youtube.com/watch?v=zzugiINb3Zo

The best and nicest solution would be to have 2 distinct framebuffer.
- One for the piLCD
- One for the HDMI

Do you think this is possible under RISCOS ?

Thank’s
Etienne

Not at the moment, no.

Dual display support for the Pi is one of the things I want to add support for, but it’s likely to be a few months away at least.

…few months away at least. Argh… ;(

I really need this feature !
Is there anything we can do to speed up the development ?

Thank’s

For the past few years the problem has been that there aren’t enough developers working on the OS, so the best way of speeding up development is to become a developer! (or find someone else to become a developer).

Hum…
This is big work just to understand how the RiscOs works !
Is there some documentation about that ?

But first, I’ll try to understand how the bcm2835 works and how to send something to a SPI LCD/TFT…

Is there anything we can do to speed up the development ?

Duplicate Jeffrey more and more? :)

so the best way of speeding up development is to become a developer!

… or be an hero yourself.

Jeffrey, can I have your email on temp1267@riscos.fr?

This is big work just to understand how the RiscOs works !
Is there some documentation about that ?

UserGuide in process of update, Tutorials etc and Programmers Reference Manual on line, but then if you have a Pi running RISC OS you have an install that already has a lot of documentation to read through already loaded.

how to send something to a SPI LCD/TFT

Bill Antonia has written a SPI driver, if you know the details of the protocol the display uses then you should be able to use that to talk to it.

http://www.beaconhillcott.net/index.php?option=com_content&view=category&layout=blog&id=37&Itemid=70

See also this thread

Jeffrey, can I have your email on temp1267@riscos.fr?

Done!

Thank’s Jeffrey

Finally there are several excellent works that probe how to implemente a SPI LCD and give some source code
http://electrodacus.com/SBMS100/SW/SBMS_ILI9341.zip (the code is in comment)
https://github.com/PaulStoffregen/XPT2046_Touchscreen

and the bcm2835 it documented here
http://www.airspayce.com/mikem/bcm2835/

With the link you gave me, I should be able to get by :)