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iPod - Initial skeleton of an audio driver

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8248 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2005-12-16 11:00:44 +00:00
parent d22938286e
commit a472ed5114
4 changed files with 404 additions and 10 deletions
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111
firmware/pcm_playback.c
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@ -26,6 +26,8 @@
#include "i2c.h"
#if defined(HAVE_UDA1380)
#include "uda1380.h"
#elif defined(HAVE_WM8975)
#include "wm8975.h"
#elif defined(HAVE_TLV320)
#include "tlv320.h"
#endif
@ -343,50 +345,139 @@ void pcm_init(void)
#elif defined(HAVE_WM8975)
/* TODO: Implement for iPod - we should probably move the UDA1380 and
WM8975 specific code into separate files.
For now, just implement some dummy functions.
/* We need to unify this code with the uda1380 code as much as possible, but
we will keep it separate during early development.
*/
static bool pcm_playing;
static bool pcm_paused;
static int pcm_freq = 0x6; /* 44.1 is default */
static unsigned char *next_start;
static long next_size;
/* Set up the DMA transfer that kicks in when the audio FIFO gets empty */
static void dma_start(const void *addr, long size)
{
pcm_playing = true;
addr = (void *)((unsigned long)addr & ~3); /* Align data */
size &= ~3; /* Size must be multiple of 4 */
return;
/* This is the uda1380 code */
#if 0
/* Reset the audio FIFO */
/* Set up DMA transfer */
SAR0 = ((unsigned long)addr); /* Source address */
DAR0 = (unsigned long)&PDOR3; /* Destination address */
BCR0 = size; /* Bytes to transfer */
/* Enable the FIFO and force one write to it */
IIS2CONFIG = IIS_DEFPARM(pcm_freq);
DCR0 = DMA_INT | DMA_EEXT | DMA_CS | DMA_SINC | DMA_START;
#endif
}
/* Stops the DMA transfer and interrupt */
static void dma_stop(void)
{
pcm_playing = false;
#if 0
/* This is the uda1380 code */
DCR0 = 0;
DSR0 = 1;
/* Reset the FIFO */
IIS2CONFIG = IIS_RESET | IIS_DEFPARM(pcm_freq);
#endif
next_start = NULL;
next_size = 0;
pcm_paused = false;
}
void pcm_init(void)
{
pcm_playing = false;
pcm_paused = false;
/* Initialize default register values. */
wm8975_init();
/* The uda1380 needs a sleep(HZ) here - do we need one? */
/* Power on */
wm8975_enable_output(true);
/* Unmute the master channel (DAC should be at zero point now). */
wm8975_mute(false);
/* Call dma_stop to initialize everything. */
dma_stop();
}
void pcm_set_frequency(unsigned int frequency)
{
(void)frequency;
pcm_freq=frequency;
}
/* the registered callback function to ask for more mp3 data */
static void (*callback_for_more)(unsigned char**, long*) = NULL;
void pcm_play_data(void (*get_more)(unsigned char** start, long* size))
{
(void)get_more;
unsigned char *start;
long size;
callback_for_more = get_more;
get_more((unsigned char **)&start, (long *)&size);
get_more(&next_start, &next_size);
dma_start(start, size);
}
void pcm_play_stop(void)
{
if (pcm_playing) {
dma_stop();
}
}
void pcm_play_pause(bool play)
{
(void)play;
if(pcm_paused && play && next_size)
{
logf("unpause");
/* We need to enable DMA here */
}
else if(!pcm_paused && !play)
{
logf("pause");
/* We need to disable DMA here */
}
pcm_paused = !play;
}
bool pcm_is_paused(void)
{
return false;
return pcm_paused;
}
bool pcm_is_playing(void)
{
return false;
return pcm_playing;
}
void pcm_calculate_peaks(int *left, int *right)
{
(void)left;
(void)right;
*left=0;
*right=0;
}
long pcm_get_bytes_waiting(void)