FreeCalypso > hg > freecalypso-reveng
comparison compal/audio/volume-ctrl @ 378:82fb5a70c9fd
compal/audio: results of simple experiments
| author | Mychaela Falconia <falcon@freecalypso.org> |
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| date | Sat, 09 Oct 2021 23:20:00 +0000 |
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| 377:34490934ff02 | 378:82fb5a70c9fd |
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| 1 It appears that the only way to bring up audio volume control (as opposed to | |
| 2 ringer volume) on a C139 phone running Mot official fw is to be in active call, | |
| 3 implying the need for a valid SIM, a GSM network, working service with that | |
| 4 SIM+network combination and a party one can test-call. When you do get into | |
| 5 the necessary active call state, navigation left and right buttons bring up the | |
| 6 audio volume control screen and move this volume up or down. However, instead | |
| 7 of seeing just 5 possible volume levels as would be available if Iota ABB | |
| 8 downlink volume controls were used in TI's simple way, we see 8 possible volume | |
| 9 levels being offered by Motorola's fw, numbered from 0 through 7. Level 0 is | |
| 10 not mute - downlink audio is still present in the earpiece speaker, albeit | |
| 11 quiet. | |
| 12 | |
| 13 It appears that Compal did something similar to Foxconn/Pirelli, probably | |
| 14 manipulating both volume and PGA gain settings in Iota VBDCTRL in order to | |
| 15 offer more than 5 possible volume levels to the user. However, because Compal | |
| 16 firmwares don't have ETM and their oabbr TM3 command is broken (returns | |
| 17 garbage), we don't have a way to just read out the register settings for each | |
| 18 volume level. Furthermore, because the audio volume setting is so difficult to | |
| 19 get to (requiring not only a SIM, but also network registration and a call), | |
| 20 doing a tfc139 break-in for each possible volume level would be too much work. |