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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>
#include "pcm_playback.h"
#ifndef SIMULATOR
#include "cpu.h"
#include "i2c.h"
#include "uda1380.h"
#include "system.h"
#endif
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "lcd.h"
#include "button.h"
#include "file.h"
#include "buffer.h"
bool pcm_playing;
/* 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 = 1;
BUSMASTER_CTRL = 0x81; /* PARK[1,0]=10 + BCR24BIT */
/* Set up DMA transfer */
DIVR0 = 54; /* DMA0 is mapped into vector 54 in system.c */
SAR0 = (unsigned long)addr; /* Source address */
DAR0 = (unsigned long)&PDOR3; /* Destination address */
BCR0 = size; /* Bytes to transfer */
DMAROUTE = (DMAROUTE & 0xffffff00) | DMA0_REQ_AUDIO_1;
DMACONFIG = 1; /* Enable DMA0Req => set DMAROUTE |= DMA0_REQ_AUDIO_1 */
/* Start transfer when requested */
DCR0 = DMA_INT | DMA_EEXT | DMA_CS | DMA_SINC;
/* Enable interrupt at level 7, priority 0 */
ICR4 = (ICR4 & 0xffff00ff) | 0x00001c00;
IMR &= ~(1<<14); /* bit 14 is DMA0 */
IIS2CONFIG = 0x4300; /* CLOCKSEL = AudioClk/8 (44.1kHz),
data source = PDOR3 */
PDOR3 = 0; /* These are needed to generate FIFO empty request to DMA.. */
PDOR3 = 0;
PDOR3 = 0;
PDOR3 = 0;
PDOR3 = 0;
}
/* Stops the DMA transfer and interrupt */
static void dma_stop(void)
{
pcm_playing = 0;
DCR0 = 0;
/* Disable DMA0 interrupt */
IMR |= (1<<14);
ICR4 &= 0xffff00ff;
}
/* the registered callback function to ask for more mp3 data */
static void (*callback_for_more)(unsigned char**, long*) = NULL;
void pcm_play_data(const unsigned char* start, int size,
void (*get_more)(unsigned char** start, long* size))
{
callback_for_more = get_more;
dma_start(start, size);
}
void pcm_play_stop(void)
{
dma_stop();
}
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)
{
unsigned char* start;
long size = 0;
DSR0 = 1; /* Clear interrupt */
if (callback_for_more)
{
callback_for_more(&start, &size);
}
if(size)
{
SAR0 = (unsigned long)start; /* Source address */
BCR0 = size; /* Bytes to transfer */
}
else
{
/* Finished playing */
dma_stop();
}
IPR |= (1<<14); /* Clear pending interrupt request */
}
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