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backlight control on Luna: switch PWL instead of LEDB This change is preliminary toward upcoming rework of backlight control logic in our UI firmware. LEDB does not exist on Tango-based platforms (it is not brought out on Tango modules), thus turning it on and off produces absolutely no effect beyond making L1 disable deep sleep when LEDB is turned on. However, both iWOW DSK and our upcoming FC Caramel2 boards have a PWL LED, so let's switch that LED on and off to indicate the state of the UI firmware's backlight control. Note that we are NOT switching the actual Luna LCD backlight here, even though it is trivially controlled with a GPIO. The reason for this seemingly strange choice is that we don't want to turn this development board LCD backlight off until we bring the higher-level backlight control logic up to par, including new logic to "swallow" the first keypress that turns on the darkened LCD.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 24 Oct 2020 07:39:54 +0000
parents a62e5bf88434
children
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FreeCalypso Luna phone handset UI development platform consists of these 3
components:

* A Caramel-type Calypso motherboard, either iWOW DSK or FC Caramel2
* An LCD carrier board, currently using HaoRan HT020K1QC36S LCD module
* A 5x5 keyswitch matrix board for the keypad function

This Luna is our primary official platform for FreeCalypso phone handset UI
development.  The UI code we got from TI comes in two interesting versions:

* Big color version: 176x220 pixels, 16-bit color
* Small B&W version: originally 84x48 pixels, we are extending it to 96x64 pix

(Originally there was also a third version, large 176x220 pix B&W, but we find
 it uninteresting and we've removed it from our supported set.  It was really
 nothing more than a hack to display a minimal-effort derivative of the original
 small B&W UI on the large D-Sample LCD, so we are not removing anything of any
 real substance here.)

FC Luna hardware is required for anyone who wishes to work on the phone handset
UI project in FC Tourmaline: it is the only target platform that can display
both versions of our work-in-progress UI firmware.  Mot C1xx and other similar
phones have small LCDs that can only display the small B&W version of our
TI-based UI, and in the Mother's opinion working solely on the smallbw version
to the exclusion of the bigcolor version is not acceptable.