e280 color temperature hack?

[defenseminister]

Dear Rockbox Developer,

I want to change two parameters in my e280 rockbox, but I don't know how. I hope its not too difficult.

Firstly, I would like to reduce the color temperature of rockbox permanently. That is to say, to do what f.lux* software does to one's desktop.

*http://stereopsis.com/flux/

I tried to manually reduce the "blue" values in the display settings, but it wasn't what I wanted.

Secondly, I would like to know if there is a way to increase the refresh rate of the screen. I don't mind if it drains the battery faster.

I hope these modifications are simple as changing a few numbers in SYS_CONFIG. Please let me know if and how I can do this.

Thank you.

Note: I am asking how to modify these parameters in my own e280 firmware. This is not a feature request for the main release.

[gbl08ma]

As far as I know, the answer for your questions is no and no.
There's no way to do color adjustments on the display of most (if not any) Rockbox targets. I think the color variables in the theme settings (if that's what you tried) just change the colors for the current theme.

For the second question, I think the refresh rate of the screen is a fixed thing, and I don't know if it can be changed in the code, or if it is something the LCD display handles itself.

[[Saint]]

As far as I know, the answer for your questions is no and no.
There's no way to do color adjustments on the display of most (if not any) Rockbox targets.
For the second question, I think the refresh rate of the screen is a fixed thing, and I don't know if it can be changed in the code, or if it is something the LCD display handles itself.

First no, I believe to be incorrect...however I am not certain. Using the brightness setting would be a lot easier but not *quite* the same.
The second no is definitely incorrect. Of course you cannot increase the refresh rate to more than the screen can physically handle, but the refresh rate of the .fms/.sbs/.wps and the menus/lists can definitely be raised by modifying the code. If I remember correctly the standard refresh rate is 10Hz for all screens, or 100Hz if a peak-meter is present.
It should be relatively simple to force the refresh rate to 100Hz at all times. Also tests done by our resident skin code developer indicated that any increase in battery usage due to increased refresh rate was negligible.


[St.]

[gbl08ma]

Thanks for the corrections, although I think what defenseminister is asking for is not brightness regulation (although lower brightness is easier on the eyes at night).

About the second part, I didn't know very well how refresh rate was handled... now I know Still, you can't change refresh rate from a setting, you must compile Rockbox yourself.

[defenseminister]

Hi,

Thank you for your replies.

Uh... I don't mind editing and compiling rockbox code myself, but if anyone could give me an indication what in the code to change to force higher refresh rate, that would be great.

Too bad about the color temperature thing. 

[saratoga]

Which screen do you want to have a higher refresh rate?