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Enabled zero crossing detection for volume changes in the WM8721/WM8731 driver (iPod G3, iPod Mini G1/G2, Iriver H10).

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12006 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-01-14 12:38:40 +00:00
parent a25fa2c6a6
commit 72f1027b3e
1 changed files with 5 additions and 2 deletions
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7
firmware/drivers/wm8731l.c
View file

@ -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;
}