DAC routines. More...

#include <dev/board.h>
#include <dev/irqreg.h>
#include <sys/event.h>
#include <sys/timer.h>
#include <stdlib.h>
#include <string.h>
#include <memdebug.h>
#include <dev/tlv320dac.h>

Include dependency graph for tlv320dac.c:

Data Structures
struct	_PCM_BUFFER
	PCM buffer type. More...
Defines
#define	TWI_SLA_DAC 0x1A
#define	TLV320DAC_VOL 0x18
#define	SAMPLE_BUFFERS 3
#define	DACI2S_PIO_ID PIOA_ID
#define	DACI2S_PINS_A _BV(PA23_TD_A) \| _BV(PA21_TF_A) \| _BV(PA22_TK_A)
#define	DACI2S_PINS_B 0
#define	DACI2S_PDR PIOA_PDR
#define	DACI2S_ASR PIOA_ASR
#define	DACI2S_BSR PIOA_BSR
#define	PCM_CHANS 2
	Number of channels.
#define	PCM_BITS 16
	Number of bits per sample.
#define	TWI_ENABLE()
#define	SDA_LOW()
#define	SDA_HIGH()
#define	SCL_LOW()
#define	SCL_HIGH()
#define	SDA_STAT() (1)
#define	TWI_DELAY 8
Typedefs
typedef struct _PCM_BUFFER	PCM_BUFFER
	PCM buffer type.
Functions
u_char	Tlv320DacReadReg (unsigned int reg)
	Read value from specified DAC register.
void	Tlv320DacWriteReg (unsigned int reg, unsigned int val)
	Write value to specified DAC register.
int	Tlv320DacSetRate (unsigned int rate)
int	Tlv320DacInit (unsigned int rate)
	Initialize TLV320AIC23B DAC interface.
int	Tlv320DacFlush (void)
	Wait until all buffered samples have been transmitted.
int	Tlv320DacWrite (void *buf, int len)
	Add audio samples to the TLV320AIC23B transmit queue.
int	Tlv320DacSetVolume (int left, int right)
	Set volume.

Detailed Description

DAC routines.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

For additional information see http://www.ethernut.de/

 * $Id: tlv320dac.c 4473 2012-08-20 15:12:45Z haraldkipp $
 *

Define Documentation

#define TWI_SLA_DAC 0x1A

Referenced by Tlv320DacWriteReg().

#define TLV320DAC_VOL 0x18

#define SAMPLE_BUFFERS 3

Referenced by Tlv320DacWrite().

#define DACI2S_PIO_ID PIOA_ID

#define DACI2S_PINS_A _BV(PA23_TD_A) | _BV(PA21_TF_A) | _BV(PA22_TK_A)

#define DACI2S_PINS_B 0

#define DACI2S_PDR PIOA_PDR

#define DACI2S_ASR PIOA_ASR

#define DACI2S_BSR PIOA_BSR

#define PCM_CHANS 2

Number of channels.

#define PCM_BITS 16

Number of bits per sample.

#define TWI_ENABLE ( )

Referenced by TwBbifInit().

#define SDA_LOW ( )

#define SDA_HIGH ( )

Referenced by TwBbifInit().

#define SCL_LOW ( )

#define SCL_HIGH ( )

Referenced by TwBbifInit().

#define SDA_STAT ( ) (1)

#define TWI_DELAY 8

Typedef Documentation

typedef struct _PCM_BUFFER PCM_BUFFER

PCM buffer type.

Function Documentation

u_char Tlv320DacReadReg ( unsigned int reg )

Read value from specified DAC register.

Not implemented, because the TLV320AIC23B is a write-only device.

Parameters:

reg	DAC register address.

Returns:: Always 0xFF.

void Tlv320DacWriteReg	(	unsigned int	reg,
		unsigned int	val
	)

Write value to specified DAC register.

Communicates with the DAC chip via TWI.

Parameters:

reg	DAC register address.
val	Value to store in specified register.

References NULL, and TWI_SLA_DAC.

Referenced by Tlv320DacInit(), Tlv320DacSetRate(), and Tlv320DacSetVolume().

int Tlv320DacSetRate ( unsigned int rate )

References DAC_SRATE, DAC_SRATE_BOSR, DAC_SRATE_SR_LSB, DAC_SRATE_USB, and Tlv320DacWriteReg().

Referenced by Tlv320DacInit().

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int Tlv320DacInit ( unsigned int rate )

Initialize TLV320AIC23B DAC interface.

Parameters:

rate	Sample rate.

Returns:: 0 on success, -1 otherwise.

References DAC_ANA_PATH, DAC_ANA_PATH_DAC, DAC_ANA_PATH_INSEL, DAC_ANA_PATH_MICB, DAC_DAI_FMT, DAC_DAI_FMT_FOR_I2S, DAC_DAI_FMT_MS, DAC_DI_ACT, DAC_DI_ACT_ACT, DAC_DIG_PATH, DAC_LHP_VOL, DAC_LHP_VOL_LHV_LSB, DAC_LHP_VOL_LRS, DAC_PWRDN, DAC_PWRDN_LINE, DAC_RESET, Tlv320DacSetRate(), and Tlv320DacWriteReg().

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int Tlv320DacFlush ( void )

Wait until all buffered samples have been transmitted.

Returns:: Always 0.

References NutEventWait(), and rc.

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int Tlv320DacWrite	(	void *	buf,
		int	len
	)

Add audio samples to the TLV320AIC23B transmit queue.

Parameters:

buf	Points to PCM data.
len	Number of samples.

Returns:: 0 on success or -1 if out of memory.

References free(), malloc(), memcpy(), NULL, NutEventWait(), SAMPLE_BUFFERS, _PCM_BUFFER::wbf_dat, _PCM_BUFFER::wbf_len, and _PCM_BUFFER::wbf_siz.

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int Tlv320DacSetVolume	(	int	left,
		int	right
	)

Set volume.

Sets the master playback gain. Range is +6..-73 dB.

Parameters:

left	Left channel gain in dB.
right	Right channel gain in dB.

Returns:: 0 on success, -1 otherwise.

References DAC_LHP_VOL, DAC_MAX_VOLUME, DAC_MIN_VOLUME, DAC_RHP_VOL, and Tlv320DacWriteReg().

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Data Structures

Defines

Typedefs

Functions

Detailed Description

Define Documentation

Typedef Documentation

Function Documentation