From 3bf321ff1c515da30357f830c435f3cb1c8d899e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Hohensohn?= <hohensoh@rockbox.org>
Date: Tue, 21 Dec 2004 23:49:43 +0000
Subject: [PATCH] aid for blind recorders: longer beep when starting a
 recording, short beep when resuming it (you may disable the voice UI to get
 rid of it)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5502 a1c6a512-1295-4272-9138-f99709370657
---
 apps/recorder/recording.c |  8 ++++++++
 firmware/export/mpeg.h    |  1 +
 firmware/mpeg.c           | 30 +++++++++++++++++++++++-------
 3 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/apps/recorder/recording.c b/apps/recorder/recording.c
index d67124a6cf..71cd20d797 100644
--- a/apps/recorder/recording.c
+++ b/apps/recorder/recording.c
@@ -322,6 +322,10 @@ bool recording_screen(void)
                 /* Only act if the mpeg is stopped */
                 if(!(mpeg_status() & MPEG_STATUS_RECORD))
                 {
+                    if (global_settings.talk_menu)
+                    {   /* no voice possible here, but a beep */
+                        mpeg_beep(0,HZ/4); /* longer beep on start */
+                    }
                     have_recorded = true;
                     talk_buffer_steal(); /* we use the mp3 buffer */
                     mpeg_record(rec_create_filename(path_buffer));
@@ -332,6 +336,10 @@ bool recording_screen(void)
                 {
                     if(mpeg_status() & MPEG_STATUS_PAUSE)
                     {
+                        if (global_settings.talk_menu)
+                        {   /* no voice possible here, but a beep */
+                            mpeg_beep(0,HZ/8); /* short beep on resume */
+                        }
                         mpeg_resume_recording();
                     }
                     else
diff --git a/firmware/export/mpeg.h b/firmware/export/mpeg.h
index f24664edc9..d61789c26e 100644
--- a/firmware/export/mpeg.h
+++ b/firmware/export/mpeg.h
@@ -99,6 +99,7 @@ unsigned int mpeg_error(void);
 void mpeg_error_clear(void);
 int mpeg_get_file_pos(void);
 unsigned long mpeg_get_last_header(void);
+void mpeg_beep(int freq, int duration);
 
 /* in order to keep the recording here, I have to expose this */
 void rec_tick(void);
diff --git a/firmware/mpeg.c b/firmware/mpeg.c
index 5a199a4169..26bfbc0dc3 100644
--- a/firmware/mpeg.c
+++ b/firmware/mpeg.c
@@ -53,6 +53,7 @@ static void stop_recording(void);
 static int get_unsaved_space(void);
 static void pause_recording(void);
 static void resume_recording(void);
+static int shadow_codec_reg0;
 #endif /* #if CONFIG_HWCODEC == MAS3587F */
 
 #ifndef SIMULATOR
@@ -2090,7 +2091,8 @@ static void init_recording(void)
     }
 
     /* Enable A/D Converters */
-    mas_codec_writereg(0x0, 0xcccd);
+    shadow_codec_reg0 = 0xcccd;
+    mas_codec_writereg(0x0, shadow_codec_reg0);
 
     /* Copy left channel to right (mono mode) */
     mas_codec_writereg(8, 0x8000);
@@ -2366,12 +2368,26 @@ void mpeg_set_recording_options(int frequency, int quality,
 void mpeg_set_recording_gain(int left, int right, bool use_mic)
 {
     /* Enable both left and right A/D */
-    mas_codec_writereg(0x0,
-                       (left << 12) |
-                       (right << 8) |
-                       (left << 4) |
-                       (use_mic?0x0008:0) | /* Connect left A/D to mic */
-                       0x0007);
+    shadow_codec_reg0 = (left << 12) |
+                        (right << 8) |
+                        (left << 4) |
+                        (use_mic?0x0008:0) | /* Connect left A/D to mic */
+                        0x0007;
+    mas_codec_writereg(0x0, shadow_codec_reg0);
+}
+
+/* try to make some kind of beep, also in recording mode */
+void mpeg_beep(int freq, int duration)
+{
+    (void)freq; /* not used yet */
+    long starttick = current_tick;
+    do
+    {
+        mas_codec_writereg(0, 0); /* some little-understood sequence, */
+        mas_codec_writereg(0, 1); /*  there may be better ways */
+    }
+    while (current_tick - starttick < duration);
+    mas_codec_writereg(0, shadow_codec_reg0); /* restore it */
 }
 
 void mpeg_new_file(const char *filename)