DA7212 on nRF5

Audio playback implementation for a DA7212 codec fed by the nRF5 I2S peripheral. More...

Data Structures
struct	AudioDevice
	DA7212 audio device. More...

Macros
#define	NRF5_AUDIO_I2S_BUF_SAMPLES_MONO   512
	Mono samples per I2S buffer.
#define	NRF5_AUDIO_I2S_BUF_COUNT   2
	Number of I2S buffers.
#define	NRF5_AUDIO_CIRC_BUF_SIZE_BYTES   4096
	Size of the queue between audio_write() and DMA, in bytes (128 ms at 16 kHz).
#define	NRF5_AUDIO_REFILL_THRESHOLD_BYTES   1024
	Free queue space, in bytes, at which the driver requests a refill.

Detailed Description

Audio playback implementation for a DA7212 codec fed by the nRF5 I2S peripheral.

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Data Structure Documentation

AudioDevice

struct AudioDevice

DA7212 audio device.

SF32LB52 audio device.

QEMU audio device.

Data Fields
DMA_Channel_TypeDef *	audec_dma_channel	AUDCODEC DAC DMA channel.
IRQn_Type	audec_dma_irq	AUDCODEC DAC DMA interrupt.
uint32_t	audec_dma_request	AUDCODEC DAC DMA request.
DMA_Channel_TypeDef *	audprc_dma_channel	AUDPRC DMA channel; not used by the driver.
IRQn_Type	audprc_dma_irq	AUDPRC DMA interrupt; not used by the driver.
uint32_t	audprc_dma_request	AUDPRC DMA request; not used by the driver.
uint32_t	base_addr	Base address of the device registers.
uint32_t	channels	Number of channels.
I2CSlavePort *	codec	Codec control port.
uint8_t	data_format	Sample width in bits; not used by the driver.
uint8_t	data_mode	Data mode; not used by the driver.
nrfx_i2s_t	i2s_instance	I2S instance.
uint8_t	irq_priority	I2S interrupt priority.
uint32_t	irq_priority	DAC DMA interrupt priority.
int	irqn	Device interrupt number.
uint32_t	lrck_pin	I2S LRCK pin, to the codec WCLK.
uint32_t	mck_pin	I2S MCK pin, to the codec MCLK.
OutputConfig	pa_ctrl	Power amplifier enable output.
const BoardPowerOps *	power_ops	Board power hooks, or NULL.
uint32_t	samplerate	Sample rate in Hz.
uint32_t	sck_pin	I2S SCK pin, to the codec BCLK.
uint32_t	sdin_pin	I2S SDIN pin, or NRF_I2S_PIN_NOT_CONNECTED.
uint32_t	sdout_pin	I2S SDOUT pin, to the codec DATA_IN.
AudioDeviceState *	state	Driver runtime state.

Macro Definition Documentation

NRF5_AUDIO_CIRC_BUF_SIZE_BYTES

#define NRF5_AUDIO_CIRC_BUF_SIZE_BYTES   4096

Size of the queue between audio_write() and DMA, in bytes (128 ms at 16 kHz).

NRF5_AUDIO_I2S_BUF_COUNT

#define NRF5_AUDIO_I2S_BUF_COUNT   2

Number of I2S buffers.

NRF5_AUDIO_I2S_BUF_SAMPLES_MONO

#define NRF5_AUDIO_I2S_BUF_SAMPLES_MONO   512

Mono samples per I2S buffer.

The stereo I2S buffer holds twice as many 16-bit samples; 512 mono samples are 32 ms at 16 kHz.

NRF5_AUDIO_REFILL_THRESHOLD_BYTES

#define NRF5_AUDIO_REFILL_THRESHOLD_BYTES   1024

Free queue space, in bytes, at which the driver requests a refill.