view doc/C139-notes @ 75:8697f358f505

backlight rework: Condat light driver accepts levels The present change is another intermediate step on the path toward new FreeCalypso backlight handling. At this intermediate step the Condat light driver accepts 0-255 backlight levels driven by MFW, and puts them out on PWL on Luna development boards. At the same time on C139 it is now possible to turn on the display backlight with or without the keypad bl - the lsb of the 0-255 backlight level controls the keypad bl. MFW presently drives only 0 and 255 backlight levels, thus there is no visible behavioral change yet - but the plan for subsequent stages of this backlight rework is to add a dimmed backlight state (no keypad bl on C139) during active calls.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 24 Oct 2020 20:44:04 +0000
parents a62e5bf88434
children
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FC Tourmaline firmware differs from Magnetite in two principal ways when it
comes to Mot C139 target support:

* C139 LCD support is implemented in a more forward-looking manner: instead of
  emulating TI's C-Sample at the lowest R2D driver level and therefore being
  forever limited to 84x48 pixel display size, Tourmaline implements a new
  96x64 pixel framebuffer, matching the native LCD size of C1xx phones.  The UI
  configuration is still black&white only though - the Mother of FreeCalypso
  has no current plans to support color UI on smaller LCD sizes than TI's
  original 176x220 pix.

* Our aftermarket FFS configuration has been changed from 64x3 at 0x3C0000 to
  64x7 at 0x300000.  Our earlier 64x3 config was chosen back in 2015, at that
  time we didn't know how much room we would end up needing for the firmware
  image vs. how much FFS content we would eventually have, and this 64x3 config
  is now deemed to be too small, allowing only one 64 KiB sector for FFS
  content.  Our new FC Tourmaline aftermarket FFS config supports up to 320 KiB
  of FFS content, matches what we use on other platforms with 4 MiB flash chips,
  leaves 3 MiB for the firmware image (our current smallbw UI fw is only 2 MiB),
  and still avoids intersection with Motorola's (or rather Compal's) original
  FFS, which is important for avoiding problems in converting C139 phones back
  and forth between Motorola and FreeCalypso firmwares.