i2s_at91.c File Reference

I2S driver implementation. More...

#include "i2s_at91.h"
#include <drv/timer.h>
#include <cfg/log.h>
#include <io/arm.h>

Go to the source code of this file.

Functions

uint8_t * i2s_getBuffer (unsigned buf_num)
 Returns one of the two buffers or NULL if none is available.
uint8_t * i2s_getFreeBuffer (void)
 Returns a buffer that will be played after the current one.
bool i2s_start (void)
 Starts playing from I2S_FIRST_BUFFER.
void i2s_init (void)
 Initializes the module and sets current buffer to I2S_FIRST_BUF.

Detailed Description

I2S driver implementation.

Version:
$Id$
Author:
Luca Ottaviano <lottaviano@develer.com>

Definition in file i2s_at91.c.

Function Documentation

uint8_t* i2s_getBuffer ( unsigned  buf_num  ) 

Returns one of the two buffers or NULL if none is available.

You can't call this function if you have already started the player.

Parameters:
buf_num The number of the buffer, ie I2S_FIRST_BUF or I2S_SECOND_BUF.
Returns:
A pointer to the buffer if the buffer is available (not full), 0 on errors

Definition at line 59 of file i2s_at91.c.

uint8_t* i2s_getFreeBuffer ( void   ) 

Returns a buffer that will be played after the current one.

You should fill it faster than your reproduction time. You can't call this function if the player is not running

Returns:
The next buffer to be played, 0 if both are busy.

Definition at line 77 of file i2s_at91.c.

bool i2s_start ( void   ) 

Starts playing from I2S_FIRST_BUFFER.

You must have filled both buffers before calling this function. Does nothing if already playing.

Returns:
false on errors, true otherwise.

Definition at line 111 of file i2s_at91.c.