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annotate doc/Modem-operation @ 72:7bf39f5e834d

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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 FC Tourmaline stdmodem functional configuration is equivalent to Magnetite
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2 hybrid. The only intentional diff from Magnetite to Tourmaline in the modem
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3 configuration is the change of Nucleus: Magnetite uses the blob version of
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4 Nucleus which came with TCS211-20070608, whereas Tourmaline uses the source
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5 version of Nucleus by Comrade XVilka. It is essentially a change from an
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6 unknown version of Nucleus to a known one, thus it should generally be
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7 considered an improvement - but as always with such changes, extensive
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8 verification and testing needs to be done in order to ensure that nothing got
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9 broken.
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10
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11 Aside from the one intentional change of Nucleus version, FC Tourmaline is an
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12 entirely new firmware source tree, thus it is always possible that something
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13 could have got broken unintentionally, particularly in rarely-tested areas of
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14 the firmware. Therefore, extensive testing will need to be done before we can
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15 declare Tourmaline stdmodem as officially replacing Magnetite hybrid for stable
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16 modem products.