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authorJens Arnold <amiconn@rockbox.org>2007-01-14 12:38:40 +0000
committerJens Arnold <amiconn@rockbox.org>2007-01-14 12:38:40 +0000
commit72f1027b3edae94ad9962c654519c2cab8566078 (patch)
treebe2a6f877292070bcea86882994a9e061e44504b /firmware/drivers/wm8731l.c
parenta25fa2c6a67760c7fd59d9d3c23ca307c77630ba (diff)
downloadrockbox-72f1027b3edae94ad9962c654519c2cab8566078.tar.gz
rockbox-72f1027b3edae94ad9962c654519c2cab8566078.zip
Enabled zero crossing detection for volume changes in the WM8721/WM8731 driver (iPod G3, iPod Mini G1/G2, Iriver H10).
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12006 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/drivers/wm8731l.c')
-rw-r--r--firmware/drivers/wm8731l.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/firmware/drivers/wm8731l.c b/firmware/drivers/wm8731l.c
index 4f0f249149..62b1b6a81e 100644
--- a/firmware/drivers/wm8731l.c
+++ b/firmware/drivers/wm8731l.c
@@ -43,6 +43,9 @@
#define IPOD_PCM_LEVEL 0x65 /* -6dB */
+/* use zero crossing to reduce clicks during volume changes */
+#define VOLUME_ZC_WAIT (1<<7)
+
/* convert tenth of dB volume (-730..60) to master volume register value */
int tenthdb2master(int db)
{
@@ -159,8 +162,8 @@ int audiohw_set_master_vol(int vol_l, int vol_r)
/* 0110000 == -73dB */
/* 0101111 == mute (0x2f) */
- wmcodec_write(LOUTVOL, vol_l);
- wmcodec_write(ROUTVOL, vol_r);
+ wmcodec_write(LOUTVOL, VOLUME_ZC_WAIT | vol_l);
+ wmcodec_write(ROUTVOL, VOLUME_ZC_WAIT | vol_r);
return 0;
}