audio.c File Reference

#include <stdlib.h>
#include "asm.h"
#include "processor.h"
#include "irq.h"
#include "audio.h"
#include "lwp_watchdog.h"

Include dependency graph for audio.c:

Macros
#define	STACKSIZE   16384
#define	DSPCR_DSPRESET   0x0800
#define	DSPCR_DSPDMA   0x0200
#define	DSPCR_DSPINTMSK   0x0100
#define	DSPCR_DSPINT   0x0080
#define	DSPCR_ARINTMSK   0x0040
#define	DSPCR_ARINT   0x0020
#define	DSPCR_AIINTMSK   0x0010
#define	DSPCR_AIINT   0x0008
#define	DSPCR_HALT   0x0004
#define	DSPCR_PIINT   0x0002
#define	DSPCR_RES   0x0001
#define	AI_CONTROL   0
#define	AI_STREAM_VOL   1
#define	AI_SAMPLE_COUNT   2
#define	AI_INT_TIMING   3
#define	AI_PSTAT   0x01
#define	AI_AISFR   0x02
#define	AI_AIINTMSK   0x04
#define	AI_AIINT   0x08
#define	AI_AIINTVLD   0x10
#define	AI_SCRESET   0x20
#define	AI_DMAFR   0x40
#define	_SHIFTL(v, s, w)   ((u32) (((u32)(v) & ((0x01 << (w)) - 1)) << (s)))
#define	_SHIFTR(v, s, w)   ((u32)(((u32)(v) >> (s)) & ((0x01 << (w)) - 1)))

Functions
static u8 *__CallbackStack	__attribute__ ((used))
static void	__AICallbackStackSwitch (AIDCallback handler)
static void	__AIDHandler (u32 nIrq, void *pCtx)
static void	__AISRCINIT ()
void	AUDIO_Init (u8 *stack)
	Initialize the AUDIO subsystem. More...
AIDCallback	AUDIO_RegisterDMACallback (AIDCallback callback)
	Register a user callback function for the audio DMA interface. More...
void	AUDIO_InitDMA (u32 startaddr, u32 len)
	Initialize an audio DMA transfer. More...
u16	AUDIO_GetDMAEnableFlag ()
	Get the audio DMA flag. More...
void	AUDIO_StartDMA ()
	Start the audio DMA operation. More...
void	AUDIO_StopDMA ()
	Stop the previously started audio DMA operation. More...
u32	AUDIO_GetDMABytesLeft ()
	Get the count of bytes, left to play, from the audio DMA interface. More...
u32	AUDIO_GetDMAStartAddr ()
	Get the main memory address for the DMA operation. More...
u32	AUDIO_GetDMALength ()
	Get the DMA transfer length configured in the audio DMA interface. More...
void	AUDIO_SetDSPSampleRate (u8 rate)
	Set the sampling rate for the DSP interface. More...
u32	AUDIO_GetDSPSampleRate ()
	Get the sampling rate for the DSP interface. More...

Variables
static vu16 *const	_dspReg = (u16*)0xCC005000
static u32	__AIInitFlag = 0
static u32	__AIActive = 0
static u64	bound_32KHz
static u64	bound_48KHz
static u64	min_wait
static u64	max_wait
static u64	buffer
static AIDCallback	__AID_Callback

Macro Definition Documentation

_SHIFTL

#define _SHIFTL	(		v,
			s,
			w
	)		((u32) (((u32)(v) & ((0x01 << (w)) - 1)) << (s)))

_SHIFTR

#define _SHIFTR	(		v,
			s,
			w
	)		((u32)(((u32)(v) >> (s)) & ((0x01 << (w)) - 1)))

AI_AIINT

#define AI_AIINT   0x08

AI_AIINTMSK

#define AI_AIINTMSK   0x04

AI_AIINTVLD

#define AI_AIINTVLD   0x10

AI_AISFR

#define AI_AISFR   0x02

AI_CONTROL

#define AI_CONTROL   0

AI_DMAFR

#define AI_DMAFR   0x40

AI_INT_TIMING

#define AI_INT_TIMING   3

AI_PSTAT

#define AI_PSTAT   0x01

AI_SAMPLE_COUNT

#define AI_SAMPLE_COUNT   2

AI_SCRESET

#define AI_SCRESET   0x20

AI_STREAM_VOL

#define AI_STREAM_VOL   1

DSPCR_AIINT

#define DSPCR_AIINT   0x0008

DSPCR_AIINTMSK

#define DSPCR_AIINTMSK   0x0010

DSPCR_ARINT

#define DSPCR_ARINT   0x0020

DSPCR_ARINTMSK

#define DSPCR_ARINTMSK   0x0040

DSPCR_DSPDMA

#define DSPCR_DSPDMA   0x0200

DSPCR_DSPINT

#define DSPCR_DSPINT   0x0080

DSPCR_DSPINTMSK

#define DSPCR_DSPINTMSK   0x0100

DSPCR_DSPRESET

#define DSPCR_DSPRESET   0x0800

DSPCR_HALT

#define DSPCR_HALT   0x0004

DSPCR_PIINT

#define DSPCR_PIINT   0x0002

DSPCR_RES

#define DSPCR_RES   0x0001

STACKSIZE

#define STACKSIZE   16384

Function Documentation

__AICallbackStackSwitch()

static void __AICallbackStackSwitch ( AIDCallback  handler )

static

Here is the call graph for this function:

Here is the caller graph for this function:

__AIDHandler()

static void __AIDHandler ( u32  nIrq, void *  pCtx  )

static

Here is the call graph for this function:

Here is the caller graph for this function:

__AISRCINIT()

static void __AISRCINIT ( )

static

Here is the call graph for this function:

Here is the caller graph for this function:

__attribute__()

static u8* __CallbackStack __attribute__ ( (used)  )

static

Here is the call graph for this function:

AUDIO_GetDMABytesLeft()

u32 AUDIO_GetDMABytesLeft

(

)

Get the count of bytes, left to play, from the audio DMA interface.

Returns

count of bytes left to play.

AUDIO_GetDMAEnableFlag()

u16 AUDIO_GetDMAEnableFlag

(

)

Get the audio DMA flag.

Returns

state of the current DMA operation.

AUDIO_GetDMALength()

u32 AUDIO_GetDMALength

(

)

Get the DMA transfer length configured in the audio DMA interface.

Returns

length of data loaded into the audio DMA interface.

AUDIO_GetDMAStartAddr()

u32 AUDIO_GetDMAStartAddr

(

)

Get the main memory address for the DMA operation.

Returns

start address of mainmemory loaded into the audio DMA interface.

AUDIO_GetDSPSampleRate()

u32 AUDIO_GetDSPSampleRate

(

)

Get the sampling rate for the DSP interface.

Returns

DSP sampling rate (AI_SAMPLERATE_32KHZ,AI_SAMPLERATE_48KHZ)

Here is the caller graph for this function:

AUDIO_Init()

void AUDIO_Init

(

u8 *

stack

)

Initialize the AUDIO subsystem.

Parameters

[in]

stack

pointer to a memory area to work as stack when calling the callbacks. May be NULL

Returns

none

Here is the call graph for this function:

AUDIO_InitDMA()

void AUDIO_InitDMA	(	u32	startaddr,
		u32	len
	)

Initialize an audio DMA transfer.

Parameters

[in]	startaddr	start address of the memory region to load into the audio DMA. NOTE: Has to be aligned on a 32byte boundery!
[in]	len	lenght of data to load into the audio DMA. NOTE: Should be a multiple of 32

Returns

none

AUDIO_RegisterDMACallback()

AIDCallback AUDIO_RegisterDMACallback

(

AIDCallback

callback

)

Register a user callback function for the audio DMA interface.

   This callback will be called whenever the audio DMA requests new data.<br>
   Internally the DMA buffers are double buffered.

Parameters

[in]

callback

pointer to the function which to call when AID interrupt has triggered.

Returns

pointer to old callback function or NULL respectively.

Here is the call graph for this function:

AUDIO_SetDSPSampleRate()

void AUDIO_SetDSPSampleRate

(

u8

rate

)

Set the sampling rate for the DSP interface.

Parameters

[in]

rate

sampling rate to set for the DSP (AI_SAMPLERATE_32KHZ,AI_SAMPLERATE_48KHZ)

Returns

none

Here is the call graph for this function:

AUDIO_StartDMA()

void AUDIO_StartDMA

(

)

Start the audio DMA operation.

   Starts to transfer the data from main memory to the audio interface thru DMA.<br>
   This call should follow the call to AUDIO_InitDMA() which is used to initialize DMA transfers.

Returns

none

AUDIO_StopDMA()

void AUDIO_StopDMA

(

)

Stop the previously started audio DMA operation.

Returns

none

Variable Documentation

__AIActive

u32 __AIActive = 0

static

__AID_Callback

AIDCallback __AID_Callback

static

__AIInitFlag

u32 __AIInitFlag = 0

static

_dspReg

vu16* const _dspReg = (u16*)0xCC005000

static

bound_32KHz

u64 bound_32KHz

static

bound_48KHz

u64 bound_48KHz

static

buffer

u64 buffer

static

max_wait

u64 max_wait

static

min_wait

u64 min_wait

static