My SAMA5 board has an LCD with variable brightness (pwm controlled).
arch/arm/src/chip/sam_lcd.c has a function called "sam_backlight) that
takes a level value, but it appears to be local to that file, and the
only call to it is in the LCD init functions in that file, complete with
a comment that says:
/REVISIT: Backlight level could be dynamically adjustable/
That's what I need.
But from an app perspective I can't get my mind around what the right
function call would be to ripple that down to something low level and
board specific. So if I change the processor, for example, the app will
still work and not rely (for example) on board ioctls.
Can someone point me in the direction of the "right" way to handle this,
please? Once I know the "flow" I can work out how and where it is best
to expose the right function.
Thanks!
