1 files changed, 132 insertions, 0 deletions
diff --git a/firmware/pcm_playback.c b/firmware/pcm_playback.c
new file mode 100644
index 0000000000..fba85f083b
--- /dev/null
+++ b/firmware/pcm_playback.c
@@ -0,0 +1,132 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 */
+}