From 6ab53ba458164921361cf6579069b4ebb691f6a7 Mon Sep 17 00:00:00 2001
From: Miika Pekkarinen <miipekk@ihme.org>
Date: Tue, 14 Jun 2005 07:54:09 +0000
Subject: Even more quiet audio initialization.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6705 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/uda1380.c | 23 +++++++++++++++--------
 firmware/export/uda1380.h  |  1 +
 firmware/pcm_playback.c    | 23 +++++++++++------------
 3 files changed, 27 insertions(+), 20 deletions(-)

(limited to 'firmware')

diff --git a/firmware/drivers/uda1380.c b/firmware/drivers/uda1380.c
index 67479fd92e..4b63ccd744 100644
--- a/firmware/drivers/uda1380.c
+++ b/firmware/drivers/uda1380.c
@@ -128,20 +128,27 @@ int uda1380_set_regs(void)
     return 0;
 }
 
+/* Silently enable / disable audio output */
+void uda1380_enable_output(bool enable)
+{
+    if (enable) {
+        uda1380_write_reg(REG_PWR, uda1380_regs[REG_PWR] | PON_HP);
+        
+        /* Sleep a while, then disable the master mute */
+        sleep(HZ/8);
+        uda1380_write_reg(REG_MUTE, MUTE_CH2);
+    } else {
+        uda1380_write_reg(REG_MUTE, MUTE_MASTER);
+        uda1380_write_reg(REG_PWR, uda1380_regs[REG_PWR] & ~PON_HP);
+    }
+}
+
 /* Initialize UDA1380 codec with default register values (uda1380_defaults) */
 int uda1380_init(void)
 {
     if (uda1380_set_regs() == -1)
         return -1;
     
-    /* Sleep a while, then power on headphone amp */
-    sleep(HZ/8);
-    uda1380_write_reg(REG_PWR, uda1380_regs[REG_PWR] | PON_HP);
-
-    /* Sleep a little more, then disable the master mute */
-    sleep(HZ/8);
-    uda1380_write_reg(REG_MUTE, MUTE_CH2);
-    
     return 0;
 }
 
diff --git a/firmware/export/uda1380.h b/firmware/export/uda1380.h
index c92a6fe30c..c6993ef84c 100644
--- a/firmware/export/uda1380.h
+++ b/firmware/export/uda1380.h
@@ -27,6 +27,7 @@
 #define _UDA1380_H
 
 extern int uda1380_init(void);
+extern void uda1380_enable_output(bool enable);
 extern int uda1380_setvol(int vol);
 extern int uda1380_mute(int mute);
 extern void uda1380_close(void);
diff --git a/firmware/pcm_playback.c b/firmware/pcm_playback.c
index 582f04cd72..3548caded5 100644
--- a/firmware/pcm_playback.c
+++ b/firmware/pcm_playback.c
@@ -116,10 +116,11 @@ void pcm_boost(bool state)
 static void dma_stop(void)
 {
     pcm_playing = false;
+    uda1380_enable_output(false);
+    pcm_boost(false);
 
     /* Reset the FIFO */
     IIS2CONFIG = 0x800;
-    pcm_boost(false);
 }
 
 /* set volume of the main channel */
@@ -222,17 +223,23 @@ void pcm_play_data(const unsigned char* start, int size,
     dma_start(start, size);
     
     get_more(&next_start, &next_size);
+    
+    /* Sleep a while, then power on audio output */
+   sleep(HZ/16);
+   uda1380_enable_output(true);
 }
 
 void pcm_play_stop(void)
 {
-    dma_stop();
+    if (pcm_playing)
+        dma_stop();
+    pcmbuf_unplayed_bytes = 0;
+    last_chunksize = 0;
     audiobuffer_pos = 0;
     audiobuffer_fillpos = 0;
     audiobuffer_free = PCMBUF_SIZE;
     pcmbuf_read_index = 0;
     pcmbuf_write_index = 0;
-    pcmbuf_unplayed_bytes = 0;
     next_start = NULL;
     next_size = 0;
     pcm_set_boost_mode(false);
@@ -431,7 +438,7 @@ bool audiobuffer_insert(char *buf, size_t length)
     if (!pcm_is_playing() && !pcm_paused) {
         pcm_boost(true);
         crossfade_active = false;
-        if (audiobuffer_free < PCMBUF_SIZE - CHUNK_SIZE*2)
+        if (audiobuffer_free < PCMBUF_SIZE - CHUNK_SIZE*4)
             pcm_play_start();
     }
 
@@ -497,14 +504,6 @@ void pcm_play_init(void)
     pcmbuf_unplayed_bytes = 0;
     crossfade_enabled = false;
     pcm_play_set_watermark(PCM_WATERMARK, pcm_watermark_callback);
-    
-    /* Play a small chunk of zeroes to initialize the playback system. */
-    audiobuffer_pos = 32000;
-    audiobuffer_free -= audiobuffer_pos;
-    memset(&audiobuffer[0], 0, audiobuffer_pos);
-    pcm_play_add_chunk(&audiobuffer[0], audiobuffer_pos, NULL);
-    pcm_play_start();
-
 }
 
 void pcm_crossfade_enable(bool on_off)
-- 
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