+Anatolij, Nikita
Hi,
Hi, many thanks for response.
On 2 March 2015 at 03:12, Hannes Petermaier Hannes.Petermaier@br-automation.com wrote:
Hello everybody,
A short question about lcd-console:
Today u-boot only supports a 'linear framebuffer', meaning the next
pixel
of a character is allways right after left and the framebuffer address
is
incrementing. We call this the display is mounted with 0° rotation.
In some cases we have a rotated display. Maybe rotated by 90° to have portrait mode or even 180° due to
mechanical
issues.
My question is: Is anybody currently working around this, having rotated display ? If not so, i would like start a implementation.
180° is quite easy, we only need to add some offset (total len of framebuffer) to our framebuffer base address and do -- instead ++ for drawing characters. Font can be reused.
In the other cases, 90° and 270° it will maybe a bit tricky. I think a ?rotated font? is also necessary.
Of course we have to think about the other functions like scroll
up/down.
I don't know of anything, but it sounds useful.
Okay, Anatolij doesn't also know anything that there is something going on. I will start to form some ideas how to implement such feature.
Also I wonder if some hardware has support for this?
"Support" is the wrong word, sometimes the the lcd is mechanical built in rotated and the logical start of the framebuffer isn't as usual at top-left, rather it it bottom-right - means rotated by 180°.
Nikita (on CC) is tidying up this part of U-Boot so get in touch with
him. Nikita, whats your opinion around that ?
Regards, Simon
best regards, Hannes