Digital microphone

Digital microphones on a PDM interface, as a codec without a gain: powered from their reference supply while recording, the gain left to the interface. More...

Data Structures
struct	pbl_audio_dmic
	Digital microphones. More...

Macros
#define	PBL_AUDIO_DMIC_DEFINE(sym, _name, _vref, _wakeup_delay_ms)
	Define digital microphones.

Detailed Description

Digital microphones on a PDM interface, as a codec without a gain: powered from their reference supply while recording, the gain left to the interface.

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Data Structure Documentation

pbl_audio_dmic

struct pbl_audio_dmic

Digital microphones.

Data Fields
struct pbl_audio_codec	codec	Codec.
const struct pbl_regulator *	vref	Reference supply, or NULL.
uint32_t	wakeup_delay_ms	Time the microphones take to wake up once powered, in ms.

Macro Definition Documentation

PBL_AUDIO_DMIC_DEFINE

#define PBL_AUDIO_DMIC_DEFINE	(		sym,
			_name,
			_vref,
			_wakeup_delay_ms
	)

Value:

  PBL_DEVICE_STATE_DEFINE(sym);                                                    \
  PBL_DEVICE_INSTANCE(sym, struct pbl_audio_dmic, struct pbl_audio_codec, codec) { \
    .codec =                                                                       \
        {                                                                          \
          .dev = PBL_DEVICE_INIT(sym, _name, nullptr, nullptr, nullptr),           \
          .ops = &pbl_audio_dmic_ops,                                              \
        },                                                                         \
    .vref = (_vref), .wakeup_delay_ms = (_wakeup_delay_ms),                        \
  }

Define digital microphones.

Parameters

sym	Symbol of the codec.
_name	Device name.
_vref	Reference supply, or NULL.
_wakeup_delay_ms	Time they take to wake up once powered, in ms.