10-22-2019, 07:23 PM
The color problem come from the fact that all theses screens run on 16 bits color space so 5 bits (32 gradients) for red and blue and 6 (64) for green.
The screen used by Freeplaytech is able of 18 bits color display (64 gradients for all channels) but even modifying Juj driver to select this color space and changing framebuffer color space didn't work for me, maybe because of timing issues, IDK :/
Something that could be interresting to test is to reduce green to 32 gradient to have the same on each channel, I already used this tricks on a Arduino project to get "real" gray gradient.
I will try during the week if I have some spare time.
Pin compatibility is a issue but not a big one, there is always a workaround since all SPI screen use basically the same IO.
One problem is to found a proper driver (both screen and software) that is capable of a good framerate. Sadly, not all are abke of this :S
As Flavor pointed out, the oher problem is to fit the screen in the shell.
The screen used by Freeplaytech is able of 18 bits color display (64 gradients for all channels) but even modifying Juj driver to select this color space and changing framebuffer color space didn't work for me, maybe because of timing issues, IDK :/
Something that could be interresting to test is to reduce green to 32 gradient to have the same on each channel, I already used this tricks on a Arduino project to get "real" gray gradient.
I will try during the week if I have some spare time.
Pin compatibility is a issue but not a big one, there is always a workaround since all SPI screen use basically the same IO.
One problem is to found a proper driver (both screen and software) that is capable of a good framerate. Sadly, not all are abke of this :S
As Flavor pointed out, the oher problem is to fit the screen in the shell.