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author | Cástor Muñoz <cmvidal@gmail.com> | 2014-12-06 18:58:25 +0100 |
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committer | Cástor Muñoz <cmvidal@gmail.com> | 2015-10-07 06:15:03 +0200 |
commit | 42abc6a49670cd546737a4dc7542f9f3f62e3831 (patch) | |
tree | 48cd6b9d86ff868be72c968b61cd9102eb33a547 /utils/hwstub/tools | |
parent | 67b4e7f958f4b6569dce8c50c117b22c9f1f9ca7 (diff) | |
download | rockbox-42abc6a49670cd546737a4dc7542f9f3f62e3831.tar.gz rockbox-42abc6a49670cd546737a4dc7542f9f3f62e3831.zip |
iPod Classic: capture support for CS42L55 codec
There are a couple of power saving options that can be selected using
defines, they configure the CODEC in a different way than OF does:
MONO_MIC: jack microphone is connected to left channel, disabling
right channel saves ~1 mW, there is no reason to not to do it.
BYPASS_PGA: this option only applies to the line-in, OF does not
bypass the PGA and configures it to 0 dB gain. At the beginning,
this patch was written based on CODEC datasheet, bypassing PGA
because it saves power and incrementes dinamic range ~1dB, i have
used this setup for a while without problems. Finally this option
was disabled at the last minute, i decided to do it after reviewing
the OF and realizing that CS42L55 datasheet recommends to bypass the
PGA only if the HW includes a couple of capacitors (see Typical
Connection Diagram, Note 4), at this moment i don't know if Classic
includes these capacitors (probably not). Anyway, i am not able to
tell the difference listening to voice recodings.
TODO:
- Use variable PGA gain for jack microphone (it is fixed to +12 dB.
as OF does).
- I am not a fan of having lots of unused #define options, these could
be useful for a generic driver but actually this driver is Classic
oriented, i am not sure if it could be considered disirable to
eliminate them in the final version.
Change-Id: I3dadf2341f44d5e13f3847e6c9de4a76cd6f0918
Diffstat (limited to 'utils/hwstub/tools')
0 files changed, 0 insertions, 0 deletions