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annotate compal/audio/tfc139-headset-entry @ 378:82fb5a70c9fd

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compal/audio: results of simple experiments
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Oct 2021 23:20:00 +0000
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82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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1 The following results have been obtained by connecting to a C139 phone via the
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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2 headset jack, switching to "Trace On" via the **16379# hidden menu, breaking in
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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3 with tfc139, then running the new tfc139-audio-dump command in fc-loadtool:
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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4
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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5 d_aec_ctrl: 0x03C7
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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6 New AEC params: 0x0001 0x0014 0x4CCC 0x59AD 0x7500 0x0000 0x1000 0x1000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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7
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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8 Uplink FIR coefficients:
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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9
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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10 0x4000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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11 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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12 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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13 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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14
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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15 Downlink FIR coefficients:
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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16
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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17 0x7FFF 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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18 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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19 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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20 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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21
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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22 VBCTRL1: 0x004
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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23 VBCTRL2: 0x007
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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24 VBPOP: 0x004
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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25 VBUCTRL: 0x1B2
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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26 VBDCTRL: 0x069
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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27
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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28 Commentary: the values read out of VBCTRL1 and VBCTRL2 registers are consistent
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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29 with the headset audio channel being selected for both input and output, leading
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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30 to the suspicion that the firmware probably switched the audio path to headset
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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31 mode even though the **16379# hidden menu selection was set to "Trace On". The
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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32 Mother's primary interest here is to see the official C139 fw settings for the
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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33 handheld audio mode (built-in earpiece and mic) rather than the headset mode,
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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34 but it now appears that such capture won't be possible except maybe by
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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35 connecting to the production test pads inside the battery compartment,
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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36 bypassing the headset jack.
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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37
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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38 Looking at what appears to be C139 headset mode audio config, we see that
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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39 HSMICBIAS voltage is set to 2.0 V, the uplink gain is set to 8 dB, and the
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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40 sidetone level is set to -23 dB: we get this info from the MICBIAS bit in
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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41 VBCTRL1 and the VBUCTRL setting. Decoding VBDCTRL, we see that the volume
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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42 control is set to -6 dB and the PGA gain is set to 3 dB. However, these
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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43 VBDCTRL settings don't tell us much: see the volume-ctrl article.
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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44
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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45 Also note the FIR coefficient oddity: no frequency curve-transforming FIR
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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46 filters are being set up, neither UL nor DL, but DL FIR coefficient 0 is set to
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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47 0x7FFF instead of 0x4000. This oddity means that Calypso DL FIR block is
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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48 producing a 6 dB gain (doubling of the samples) purely on the digital side,
82fb5a70c9fd compal/audio: results of simple experiments
Mychaela Falconia <falcon@freecalypso.org>
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49 before DL audio passes to the ABB - certainly a noteworthy hack.