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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
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1 State of blobs in FreeCalypso firmware
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2 ======================================
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3
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4 FC Tourmaline is almost completely deblobbed. Only the following very small
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5 components exist in the form of blobs (prebuilt binary objects for which we
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6 have no exact corresponding source) in the standard Tourmaline build:
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7
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8 * OSL and OSX glue components of GPF: 14992 bytes of code
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9 * TMS470 compiler's RTS library (libc/libgcc equivalent): 13152 bytes of code
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10
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11 For OSL and OSX we do have reconstructed C code written based on disassembly of
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12 the blobs, but I (Mother Mychaela) do not consider the current state of this C
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13 reconstruction to be fit for production use - hence standard Tourmaline fw
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14 builds use blob versions of these components. However, our configuration and
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15 build system gives you the freedom to select which version of each component
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16 you would rather use; the selection is made with Bourne shell config variables
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17 on the configure.sh invokation line:
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18
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19 OSL=0 use the blob version of OSL
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20 OSL=1 use the reconstructed C version of OSL
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21 OSX=0 use the blob version of OSX
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22 OSX=1 use the reconstructed C version of OSX
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23
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24 The current default is OSL=0 and OSX=0.
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25
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26 RTS library
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27 ===========
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28
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29 We do have source code for some versions of the TMS470 compiler's RTS library,
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30 but they may not be exactly corresponding to the blob version from TCS211 which
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31 we are using. This area is deemed to be such a low priority that no real
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32 investigation has been done yet.