FreeCalypso > hg > fc-tourmaline
annotate doc/Modem-operation @ 273:5caa86ee2cfa
enable L1_NEW_AEC in l1_confg.h (bold change)
The AEC function implemented in DSP ROM 3606 on the Calypso silicon
we work with is the one that corresponds to L1_NEW_AEC; the same holds
for DSP 34 and even for DSP 33 with more recent patch versions.
However, TI shipped their TCS211 reference fw with L1_NEW_AEC set to 0,
thus driving AEC the old way if anyone tried to enable it, either via
AT%Nxxxx or via the audio mode facility. As a result, the fw would
try to control features which no longer exist in the DSP (long vs short
echo and the old echo suppression level bits), while providing no way
to tune the 8 new parameter words added to the DSP's NDB page.
The only sensible solution is to bite the bullet and enable L1_NEW_AEC
in L1 config, with fallout propagating into RiViera Audio Service
T_AUDIO_AEC_CFG structure and into /aud/*.cfg binary file format.
The latter fallout will be addressed in further code changes.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 29 Jul 2021 18:32:40 +0000 |
| parents | a62e5bf88434 |
| children |
| rev | line source |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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1 FC Tourmaline stdmodem functional configuration is equivalent to Magnetite |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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2 hybrid. The only intentional diff from Magnetite to Tourmaline in the modem |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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3 configuration is the change of Nucleus: Magnetite uses the blob version of |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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4 Nucleus which came with TCS211-20070608, whereas Tourmaline uses the source |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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5 version of Nucleus by Comrade XVilka. It is essentially a change from an |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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6 unknown version of Nucleus to a known one, thus it should generally be |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
7 considered an improvement - but as always with such changes, extensive |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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8 verification and testing needs to be done in order to ensure that nothing got |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 broken. |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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10 |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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11 Aside from the one intentional change of Nucleus version, FC Tourmaline is an |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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12 entirely new firmware source tree, thus it is always possible that something |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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13 could have got broken unintentionally, particularly in rarely-tested areas of |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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14 the firmware. Therefore, extensive testing will need to be done before we can |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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15 declare Tourmaline stdmodem as officially replacing Magnetite hybrid for stable |
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a62e5bf88434
first round of documentation
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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16 modem products. |