Macros
#define	LINE_IN 0

#define	MIC 1

#define	IIC_SLAVE_ADDR 0x3B

#define	IIC_SCLK_RATE 400000

#define	I2S_DATA_RX_L_REG 0x00

#define	I2S_DATA_RX_R_REG 0x04

#define	I2S_DATA_TX_L_REG 0x08

#define	I2S_DATA_TX_R_REG 0x0C

#define	I2S_STATUS_REG 0x10

Enumerations
enum	audio_adau1761_regs { R0_CLOCK_CONTROL = 0x00 , R1_PLL_CONTROL = 0x02 , R2_DIGITAL_MIC_JACK_DETECTION_CONTROL = 0x08 , R3_RECORD_POWER_MANAGEMENT = 0x09 , R4_RECORD_MIXER_LEFT_CONTROL_0 = 0x0A , R5_RECORD_MIXER_LEFT_CONTROL_1 = 0x0B , R6_RECORD_MIXER_RIGHT_CONTROL_0 = 0x0C , R7_RECORD_MIXER_RIGHT_CONTROL_1 = 0x0D , R8_LEFT_DIFFERENTIAL_INPUT_VOLUME_CONTROL = 0x0E , R9_RIGHT_DIFFERENTIAL_INPUT_VOLUME_CONTROL = 0x0F , R10_RECORD_MICROPHONE_BIAS_CONTROL = 0x10 , R11_ALC_CONTROL_0 = 0x11 , R12_ALC_CONTROL_1 = 0x12 , R13_ALC_CONTROL_2 = 0x13 , R14_ALC_CONTROL_3 = 0x14 , R15_SERIAL_PORT_CONTROL_0 = 0x15 , R16_SERIAL_PORT_CONTROL_1 = 0x16 , R17_CONVERTER_CONTROL_0 = 0x17 , R18_CONVERTER_CONTROL_1 = 0x18 , R19_ADC_CONTROL = 0x19 , R20_LEFT_INPUT_DIGITAL_VOLUME = 0x1A , R21_RIGHT_INPUT_DIGITAL_VOLUME = 0x1B , R22_PLAYBACK_MIXER_LEFT_CONTROL_0 = 0x1C , R23_PLAYBACK_MIXER_LEFT_CONTROL_1 = 0x1D , R24_PLAYBACK_MIXER_RIGHT_CONTROL_0 = 0x1E , R25_PLAYBACK_MIXER_RIGHT_CONTROL_1 = 0x1F , R26_PLAYBACK_LR_MIXER_LEFT_LINE_OUTPUT_CONTROL = 0x20 , R27_PLAYBACK_LR_MIXER_RIGHT_LINE_OUTPUT_CONTROL = 0x21 , R28_PLAYBACK_LR_MIXER_MONO_OUTPUT_CONTROL = 0x22 , R29_PLAYBACK_HEADPHONE_LEFT_VOLUME_CONTROL = 0x23 , R30_PLAYBACK_HEADPHONE_RIGHT_VOLUME_CONTROL = 0x24 , R31_PLAYBACK_LINE_OUTPUT_LEFT_VOLUME_CONTROL = 0x25 , R32_PLAYBACK_LINE_OUTPUT_RIGHT_VOLUME_CONTROL = 0x26 , R33_PLAYBACK_MONO_OUTPUT_CONTROL = 0x27 , R34_PLAYBACK_POP_CLICK_SUPPRESSION = 0x28 , R35_PLAYBACK_POWER_MANAGEMENT = 0x29 , R36_DAC_CONTROL_0 = 0x2A , R37_DAC_CONTROL_1 = 0x2B , R38_DAC_CONTROL_2 = 0x2C , R39_SERIAL_PORT_PAD_CONTROL = 0x2D , R40_CONTROL_PORT_PAD_CONTROL_0 = 0x2F , R41_CONTROL_PORT_PAD_CONTROL_1 = 0x30 , R42_JACK_DETECT_PIN_CONTROL = 0x31 , R67_DEJITTER_CONTROL = 0x36 , R58_SERIAL_INPUT_ROUTE_CONTROL = 0xF2 , R59_SERIAL_OUTPUT_ROUTE_CONTROL = 0xF3 , R61_DSP_ENABLE = 0xF5 , R62_DSP_RUN = 0xF6 , R63_DSP_SLEW_MODES = 0xF7 , R64_SERIAL_PORT_SAMPLING_RATE = 0xF8 , R65_CLOCK_ENABLE_0 = 0xF9 , R66_CLOCK_ENABLE_1 = 0xFA }

Functions
void	audio_init (void)

void	audio_select_input (int input)

void	write_audio_reg (unsigned char u8RegAddr, unsigned char u8Data, int iic_fd)

void	config_audio_pll (void)

void	config_audio_codec (void)

void	select_line_in (void)

void	select_mic (void)

void	deselect (void)

void	audio_bypass (unsigned int audio_mmap_size, unsigned int nsamples, unsigned int volume, int uio_index)

void	audio_record (unsigned int audio_mmap_size, unsigned int *BufAddr, unsigned int nsamples, int uio_index)

void	audio_play (unsigned int audio_mmap_size, unsigned int *BufAddr, unsigned int nsamples, unsigned int volume, int uio_index)

void	audio_repeat_play (unsigned int audio_mmap_size, unsigned int *BufAddr, unsigned int nsamples, unsigned int volume, unsigned int repetitions)

void	audio_generate_tone (unsigned int frequency, uint32_t time_ms, unsigned int volume)

Detailed Description

Low-level audio functions.

mic+ph and line_in can be used as audio input and mic+ph as output.

An example of using this library to play audio from line_in to mic+Ph:

#include <libpynq.h>
int main (void)
{
 pynq_init();
 audio_init();
 audio_select_input(MIC);
 while(1) {
   audio_bypass(64*1024, 32*1024, 50, 0);
 }
 deselect();
 pynq_destroy();
 return EXIT_SUCCES;
}

Macro Definition Documentation

◆ I2S_DATA_RX_L_REG

#define I2S_DATA_RX_L_REG 0x00

Definition at line 42 of file audio.h.

◆ I2S_DATA_RX_R_REG

#define I2S_DATA_RX_R_REG 0x04

Definition at line 43 of file audio.h.

◆ I2S_DATA_TX_L_REG

#define I2S_DATA_TX_L_REG 0x08

Definition at line 44 of file audio.h.

◆ I2S_DATA_TX_R_REG

#define I2S_DATA_TX_R_REG 0x0C

Definition at line 45 of file audio.h.

◆ I2S_STATUS_REG

#define I2S_STATUS_REG 0x10

Definition at line 46 of file audio.h.

◆ IIC_SCLK_RATE

#define IIC_SCLK_RATE 400000

Definition at line 39 of file audio.h.

◆ IIC_SLAVE_ADDR

#define IIC_SLAVE_ADDR 0x3B

Definition at line 36 of file audio.h.

◆ LINE_IN

#define LINE_IN 0

Definition at line 32 of file audio.h.

◆ MIC

#define MIC 1

Definition at line 33 of file audio.h.

Enumeration Type Documentation

◆ audio_adau1761_regs

enum audio_adau1761_regs

Enumerator
R0_CLOCK_CONTROL
R1_PLL_CONTROL
R2_DIGITAL_MIC_JACK_DETECTION_CONTROL
R3_RECORD_POWER_MANAGEMENT
R4_RECORD_MIXER_LEFT_CONTROL_0
R5_RECORD_MIXER_LEFT_CONTROL_1
R6_RECORD_MIXER_RIGHT_CONTROL_0
R7_RECORD_MIXER_RIGHT_CONTROL_1
R8_LEFT_DIFFERENTIAL_INPUT_VOLUME_CONTROL
R9_RIGHT_DIFFERENTIAL_INPUT_VOLUME_CONTROL
R10_RECORD_MICROPHONE_BIAS_CONTROL
R11_ALC_CONTROL_0
R12_ALC_CONTROL_1
R13_ALC_CONTROL_2
R14_ALC_CONTROL_3
R15_SERIAL_PORT_CONTROL_0
R16_SERIAL_PORT_CONTROL_1
R17_CONVERTER_CONTROL_0
R18_CONVERTER_CONTROL_1
R19_ADC_CONTROL
R20_LEFT_INPUT_DIGITAL_VOLUME
R21_RIGHT_INPUT_DIGITAL_VOLUME
R22_PLAYBACK_MIXER_LEFT_CONTROL_0
R23_PLAYBACK_MIXER_LEFT_CONTROL_1
R24_PLAYBACK_MIXER_RIGHT_CONTROL_0
R25_PLAYBACK_MIXER_RIGHT_CONTROL_1
R26_PLAYBACK_LR_MIXER_LEFT_LINE_OUTPUT_CONTROL
R27_PLAYBACK_LR_MIXER_RIGHT_LINE_OUTPUT_CONTROL
R28_PLAYBACK_LR_MIXER_MONO_OUTPUT_CONTROL
R29_PLAYBACK_HEADPHONE_LEFT_VOLUME_CONTROL
R30_PLAYBACK_HEADPHONE_RIGHT_VOLUME_CONTROL
R31_PLAYBACK_LINE_OUTPUT_LEFT_VOLUME_CONTROL
R32_PLAYBACK_LINE_OUTPUT_RIGHT_VOLUME_CONTROL
R33_PLAYBACK_MONO_OUTPUT_CONTROL
R34_PLAYBACK_POP_CLICK_SUPPRESSION
R35_PLAYBACK_POWER_MANAGEMENT
R36_DAC_CONTROL_0
R37_DAC_CONTROL_1
R38_DAC_CONTROL_2
R39_SERIAL_PORT_PAD_CONTROL
R40_CONTROL_PORT_PAD_CONTROL_0
R41_CONTROL_PORT_PAD_CONTROL_1
R42_JACK_DETECT_PIN_CONTROL
R67_DEJITTER_CONTROL
R58_SERIAL_INPUT_ROUTE_CONTROL
R59_SERIAL_OUTPUT_ROUTE_CONTROL
R61_DSP_ENABLE
R62_DSP_RUN
R63_DSP_SLEW_MODES
R64_SERIAL_PORT_SAMPLING_RATE
R65_CLOCK_ENABLE_0
R66_CLOCK_ENABLE_1

Definition at line 49 of file audio.h.

Function Documentation

◆ audio_bypass()

void audio_bypass	(	unsigned int	audio_mmap_size,
		unsigned int	nsamples,
		unsigned int	volume,
		int	uio_index
	)

Record and play the audio without storing in DRAM.

Parameters

audio_mmap_size	is the address range of the audio codec.
nsamples	is the number of samples to read and output.
uio_index	is the uio index in /dev list.

Definition at line 304 of file audio.c.

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◆ audio_generate_tone()

void audio_generate_tone	(	unsigned int	frequency,
		uint32_t	time_ms,
		unsigned int	volume
	)

Definition at line 570 of file audio.c.

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◆ audio_init()

void audio_init ( void )

Initializes the audio register. Sets the sampling frequency. defines several values such as audio record volume and playback volume. output is always played over mic+ph aux output.

Definition at line 72 of file audio.c.

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◆ audio_play()

void audio_play	(	unsigned int	audio_mmap_size,
		unsigned int *	BufAddr,
		unsigned int	nsamples,
		unsigned int	volume,
		int	uio_index
	)

Definition at line 430 of file audio.c.

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◆ audio_record()

void audio_record	(	unsigned int	audio_mmap_size,
		unsigned int *	BufAddr,
		unsigned int	nsamples,
		int	uio_index
	)

Function to support audio recording without the audio codec controller.

Notice that the buffer has to be twice the size of the number of samples, because both left and right channels are sampled.

Parameters

audio_mmap_size	is the address range of the audio codec.
BufAddr	is the buffer address.
nsamples	is the number of samples.
uio_index	is the uio index in /dev list.

Definition at line 381 of file audio.c.

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◆ audio_repeat_play()

void audio_repeat_play	(	unsigned int	audio_mmap_size,
		unsigned int *	BufAddr,
		unsigned int	nsamples,
		unsigned int	volume,
		unsigned int	repetitions
	)

Function to play one audio fragment for multiple repititions.

Parameters

audio_mmap_size	is the address range of the audio codec.
BufAddr	is the buffer address.
nsamples	is the number of samples.
volume	is the volume of the output.
repetitions	is the number of repitions.

Definition at line 502 of file audio.c.

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◆ audio_select_input()

void audio_select_input ( int input )

selects the audio input channel.

Parameters

input defines the input. Can be 0 LINE_IN or 1 MIC

Warning: Fails with program exit when input is not valid.

Definition at line 77 of file audio.c.

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◆ config_audio_codec()

void config_audio_codec ( void )

Definition at line 174 of file audio.c.

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◆ config_audio_pll()

void config_audio_pll ( void )

Definition at line 102 of file audio.c.

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◆ deselect()

void deselect ( void )

Function to deselect input, either LINE_IN, or MIC.

Definition at line 286 of file audio.c.

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◆ select_line_in()

void select_line_in ( void )

Function to select LINE_IN as input.

Definition at line 234 of file audio.c.

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◆ select_mic()

void select_mic ( void )

Function to select MIC as input.

Definition at line 257 of file audio.c.

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◆ write_audio_reg()

void write_audio_reg	(	unsigned char	u8RegAddr,
		unsigned char	u8Data,
		int	iic_fd
	)

Definition at line 90 of file audio.c.

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Macros

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ I2S_DATA_RX_L_REG

◆ I2S_DATA_RX_R_REG

◆ I2S_DATA_TX_L_REG

◆ I2S_DATA_TX_R_REG

◆ I2S_STATUS_REG

◆ IIC_SCLK_RATE

◆ IIC_SLAVE_ADDR

◆ LINE_IN

◆ MIC

Enumeration Type Documentation

◆ audio_adau1761_regs

Function Documentation

◆ audio_bypass()

◆ audio_generate_tone()

◆ audio_init()

◆ audio_play()

◆ audio_record()

◆ audio_repeat_play()

◆ audio_select_input()

◆ config_audio_codec()

◆ config_audio_pll()

◆ deselect()

◆ select_line_in()

◆ select_mic()

◆ write_audio_reg()