From dfa95c334b9cffff28059e0de39ae5305e315ee6 Mon Sep 17 00:00:00 2001 From: Jörg Hohensohn Date: Fri, 24 Dec 2004 08:42:45 +0000 Subject: different kind of recording beep: more faint, but not disturbing prerecording, can beep while we already record (no latency due to beep) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5511 a1c6a512-1295-4272-9138-f99709370657 --- firmware/mpeg.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'firmware/mpeg.c') diff --git a/firmware/mpeg.c b/firmware/mpeg.c index 26bfbc0dc3..becd3d54cb 100644 --- a/firmware/mpeg.c +++ b/firmware/mpeg.c @@ -2377,17 +2377,17 @@ void mpeg_set_recording_gain(int left, int right, bool use_mic) } /* try to make some kind of beep, also in recording mode */ -void mpeg_beep(int freq, int duration) +void mpeg_beep(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 */ + { /* toggle bit 0 of codec register 0, toggling the DAC off & on. + * While this is still audible even without an external signal, + * it doesn't affect the (pre-)recording. */ + mas_codec_writereg(0, shadow_codec_reg0 ^ 1); + mas_codec_writereg(0, shadow_codec_reg0); } while (current_tick - starttick < duration); - mas_codec_writereg(0, shadow_codec_reg0); /* restore it */ } void mpeg_new_file(const char *filename) -- cgit v1.2.3