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annotate doc/Luna-notes @ 221:5bf097aeaad7

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LLS: when turning off all LEDs on boot, skip LED-C Having LLS turn off LED-A and LED-B on boot is normally unnecessary (they should already be off in Iota), but it is harmless, hence this logic is kept for robustness. However, having LLS read-modify-write the BCICTL2 register (to turn off LED-C) creates a potential race condition with FCHG writes to this register, especially in the case when baseband switch-on is caused by VCHG and charging is expected to start right away. Furthermore, control of the charging LED itself (on those hw targets that have it) is the responsibility of the FCHG SWE, hence LLS should leave it alone.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 21:55:13 +0000
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1 FreeCalypso Luna phone handset UI development platform consists of these 3
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2 components:
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3
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4 * A Caramel-type Calypso motherboard, either iWOW DSK or FC Caramel2
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5 * An LCD carrier board, currently using HaoRan HT020K1QC36S LCD module
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6 * A 5x5 keyswitch matrix board for the keypad function
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7
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8 This Luna is our primary official platform for FreeCalypso phone handset UI
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9 development. The UI code we got from TI comes in two interesting versions:
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10
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11 * Big color version: 176x220 pixels, 16-bit color
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12 * Small B&W version: originally 84x48 pixels, we are extending it to 96x64 pix
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13
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14 (Originally there was also a third version, large 176x220 pix B&W, but we find
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15 it uninteresting and we've removed it from our supported set. It was really
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16 nothing more than a hack to display a minimal-effort derivative of the original
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17 small B&W UI on the large D-Sample LCD, so we are not removing anything of any
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18 real substance here.)
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19
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20 FC Luna hardware is required for anyone who wishes to work on the phone handset
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21 UI project in FC Tourmaline: it is the only target platform that can display
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22 both versions of our work-in-progress UI firmware. Mot C1xx and other similar
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23 phones have small LCDs that can only display the small B&W version of our
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24 TI-based UI, and in the Mother's opinion working solely on the smallbw version
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25 to the exclusion of the bigcolor version is not acceptable.