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.
boards: arm: cxd56xx: audio: add power_control and audio_tone_generator
* boards: arm: cxd56xx: audio: add power_control
Add a simeple way to control the audio power for userspace apps
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
* boards: arm: cxd56xx: audio: add audio_tone_generator
Add a simple way to control the audio buzzer with defined frequency
for userspace apps
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Approved-by: Gregory Nutt <gnutt@nuttx.org>
