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rockbox/firmware/pcm_playback.c
Miika Pekkarinen 6e291fdcdf Fixed and removed the most annoying pops with iRiver. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7368 a1c6a512-1295-4272-9138-f99709370657
2005-08-21 17:34:56 +00:00

330 lines
8.4 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdbool.h>
#include "config.h"
#include "debug.h"
#include "panic.h"
#include <kernel.h>
#ifndef SIMULATOR
#include "cpu.h"
#include "i2c.h"
#if defined(HAVE_UDA1380)
#include "uda1380.h"
#elif defined(HAVE_TLV320)
#include "tlv320.h"
#endif
#include "system.h"
#endif
#include "logf.h"
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "pcm_playback.h"
#include "lcd.h"
#include "button.h"
#include "file.h"
#include "buffer.h"
#include "sprintf.h"
#include "button.h"
#include <string.h>
#ifdef HAVE_UDA1380
#define EBU_DEFPARM ((7 << 12) | (3 << 8) | (1 << 5) | (5 << 2))
#define IIS_DEFPARM(freq) ((freq << 12) | 0x300 | 4 << 2)
#define IIS_RESET 0x800
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 */
/* Reset the audio FIFO */
//IIS2CONFIG = IIS_RESET;
EBU1CONFIG = IIS_RESET;
/* 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);
/* Also send the audio to S/PDIF */
EBU1CONFIG = EBU_DEFPARM;
DCR0 = DMA_INT | DMA_EEXT | DMA_CS | DMA_SINC | DMA_START;
}
/* Stops the DMA transfer and interrupt */
static void dma_stop(void)
{
pcm_playing = false;
DCR0 = 0;
/* Reset the FIFO */
IIS2CONFIG = IIS_RESET | IIS_DEFPARM(pcm_freq);
EBU1CONFIG = IIS_RESET;
next_start = NULL;
next_size = 0;
pcm_paused = false;
}
/*
* This function goes directly into the DMA buffer to calculate the left and
* right peak values. To avoid missing peaks it tries to look forward a full
* refresh period (1/20 sec) although it's always possible that the entire
* period will not be visible. To reduce CPU load it only looks at every
* third sample, and this can be reduced even further if needed (even every
* tenth sample would still be pretty accurate).
*/
#define PEAK_SAMPLES 2205 /* 44100 sample rate / 20 Hz refresh */
#define PEAK_STRIDE 3 /* every 3rd sample is plenty... */
void pcm_calculate_peaks(int *left, int *right)
{
long samples = (BCR0 & 0xffffff) / 4;
short *addr = (short *) (SAR0 & ~3);
if (samples > PEAK_SAMPLES)
samples = PEAK_SAMPLES;
samples /= PEAK_STRIDE;
if (left && right) {
int left_peak = 0, right_peak = 0, value;
while (samples--) {
if ((value = addr [0]) > left_peak)
left_peak = value;
else if (-value > left_peak)
left_peak = -value;
if ((value = addr [PEAK_STRIDE | 1]) > right_peak)
right_peak = value;
else if (-value > right_peak)
right_peak = -value;
addr += PEAK_STRIDE * 2;
}
*left = left_peak;
*right = right_peak;
}
else if (left || right) {
int peak_value = 0, value;
if (right)
addr += (PEAK_STRIDE | 1);
while (samples--) {
if ((value = addr [0]) > peak_value)
peak_value = value;
else if (-value > peak_value)
peak_value = -value;
addr += PEAK_STRIDE * 2;
}
if (left)
*left = peak_value;
else
*right = peak_value;
}
}
/* sets frequency of input to DAC */
void pcm_set_frequency(unsigned int frequency)
{
switch(frequency)
{
case 11025:
pcm_freq = 0x4;
uda1380_set_nsorder(3);
break;
case 22050:
pcm_freq = 0x6;
uda1380_set_nsorder(3);
break;
case 44100:
default:
pcm_freq = 0xC;
uda1380_set_nsorder(5);
break;
}
}
/* 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))
{
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);
}
long pcm_get_bytes_waiting(void)
{
return next_size + (BCR0 & 0xffffff);
}
void pcm_play_stop(void)
{
if (pcm_playing) {
dma_stop();
}
}
void pcm_play_pause(bool play)
{
if(pcm_paused && play && next_size)
{
logf("unpause");
/* Reset chunk size so dma has enough data to fill the fifo. */
/* This shouldn't be needed anymore. */
//SAR0 = (unsigned long)next_start;
//BCR0 = next_size;
/* Enable the FIFO and force one write to it */
IIS2CONFIG = IIS_DEFPARM(pcm_freq);
EBU1CONFIG = EBU_DEFPARM;
DCR0 |= DMA_EEXT | DMA_START;
}
else if(!pcm_paused && !play)
{
logf("pause");
/* Disable DMA peripheral request. */
DCR0 &= ~DMA_EEXT;
IIS2CONFIG = IIS_RESET | IIS_DEFPARM(pcm_freq);
EBU1CONFIG = IIS_RESET;
}
pcm_paused = !play;
}
bool pcm_is_paused(void)
{
return pcm_paused;
}
bool pcm_is_playing(void)
{
return pcm_playing;
}
/* DMA0 Interrupt is called when the DMA has finished transfering a chunk */
void DMA0(void) __attribute__ ((interrupt_handler, section(".icode")));
void DMA0(void)
{
int res = DSR0;
DSR0 = 1; /* Clear interrupt */
DCR0 &= ~DMA_EEXT;
/* Stop on error */
if(res & 0x70)
{
pcm_play_stop();
logf("DMA Error:0x%04x", res);
}
else
{
if(next_size)
{
SAR0 = (unsigned long)next_start; /* Source address */
BCR0 = next_size; /* Bytes to transfer */
DCR0 |= DMA_EEXT;
if (callback_for_more)
callback_for_more(&next_start, &next_size);
}
else
{
/* Finished playing */
pcm_play_stop();
logf("DMA No Data:0x%04x", res);
}
}
IPR |= (1<<14); /* Clear pending interrupt request */
}
void pcm_init(void)
{
pcm_playing = false;
pcm_paused = false;
BUSMASTER_CTRL = 0x81; /* PARK[1,0]=10 + BCR24BIT */
DIVR0 = 54; /* DMA0 is mapped into vector 54 in system.c */
DMAROUTE = (DMAROUTE & 0xffffff00) | DMA0_REQ_AUDIO_1;
DMACONFIG = 1; /* DMA0Req = PDOR3 */
/* Reset the audio FIFO */
IIS2CONFIG = IIS_RESET;
/* Enable interrupt at level 7, priority 0 */
ICR4 = (ICR4 & 0xffff00ff) | 0x00001c00;
IMR &= ~(1<<14); /* bit 14 is DMA0 */
pcm_set_frequency(44100);
/* Prevent pops (resets DAC to zero point) */
IIS2CONFIG = IIS_DEFPARM(pcm_freq) | IIS_RESET;
#if defined(HAVE_UDA1380)
/* Initialize default register values. */
uda1380_init();
/* Turn on headphone power */
uda1380_enable_output(true);
/* Sleep a little so the power can stabilize. */
sleep(HZ/4);
/* Unmute the master channel (DAC should be at zero point now). */
uda1380_mute(false);
#elif defined(HAVE_TLV320)
tlv320_init();
tlv320_enable_output(true);
sleep(HZ/4);
tlv320_mute(false);
#endif
/* Call dma_stop to initialize everything. */
dma_stop();
}
#endif /* HAVE_UDA1380 */
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