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annotate doc/Modem-operation @ 75:8697f358f505

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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
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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.