15)
Advanced hardware details
The following section is for more advanced users.
Software:
•
Depending on the Linux kernel version, the audio mixer / volumes will report the Hardware volume
mixer as either “PCM”, “Playback Digital” or more recently just “Digital”. Please see alsamixer for
the name used in your particular kernel version.
•
Not all features of the PCM512x device driver have been fully tested. Changing settings other
than the standard Mixer may NOT provide the expected result.
•
We expect the following Raspberry Pi GPIO to be used by IQaudIO products
o
GPIO22 (AMP+ & DigiAMP+ mute / unmute support)
o
GPIO23/24 for our Rotary Encoder (volume control) software
o
GPIO25 for the IR Sensor software.
Hardware I/O information (Pi-DAC+ and Pi-DigiAMP+):
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