Tobias Johansson 5fb835b1df boards: cxd56: enable Nuttx audio driver
Adds an initial Nuttx audio driver supporting the Spresense CXD56.
Being a work in progress the driver has a number of limitations:
- Audio playback only, no recording yet.
- Only 16 bit stereo playback is supported.
- In practice only 48kHz playback is supported due to missing SRC.
2020-04-16 12:50:05 -06:00
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