In the previous implementation, cxd56_stop() checked the internal
state before sending AUDIO_MSG_STOP to the message queue. However,
if the worker thread took time to turn on AMP, cxd560_stop() was
not able to send the message and caused a deadlock.
This commit fixes this issue by always sending AUDIO_MSG_STOP
regardless of the internal state.
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Add recording support to the Nuttx audio driver for Spresense.
- Supports 16 bit data with 48 kHz sample rate only for now.
- Supports 1 (dual mono) 2 or 4 channels.
- Only analog mics have been tested so digital is considered
unsupported.
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.
- Configure driver in "Device Drivers --> Audio Device Support".
