diff options
| author | Bertrik Sikken <bertrik@sikken.nl> | 2010-08-18 21:42:03 +0000 |
|---|---|---|
| committer | Bertrik Sikken <bertrik@sikken.nl> | 2010-08-18 21:42:03 +0000 |
| commit | b73d15e9c6175ac48b2280b089a40f0554d15d6f (patch) | |
| tree | d12eacb864e4335104ae8dc1270f4760653e3042 /firmware/target/arm | |
| parent | 2e572e4da09bbdc1a218b5c1113ec07983f5cd99 (diff) | |
Sansa AMSv2: enable PLLB and use it to generate a more accurate PCM frequency (playback rate error improves from 1.1% to 0.04%) - FS #10906 by me.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27845 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm')
| -rw-r--r-- | firmware/target/arm/as3525/clock-target.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/firmware/target/arm/as3525/clock-target.h b/firmware/target/arm/as3525/clock-target.h index 1689c59448..7c388ad6c9 100644 --- a/firmware/target/arm/as3525/clock-target.h +++ b/firmware/target/arm/as3525/clock-target.h @@ -73,7 +73,7 @@ #define AS3525_PLLA_FREQ 240000000 #define AS3525_PLLA_SETTING 0x113B -#define AS3525_PLLB_FREQ 192000000 +#define AS3525_PLLB_FREQ 192000000 /* allows 44.1kHz with 0.04% error*/ #define AS3525_PLLB_SETTING 0x155F #define AS3525_FCLK_PREDIV 0 @@ -146,7 +146,14 @@ #endif /* CONFIG_CPU == AS3525v2 */ /* MCLK */ +#if CONFIG_CPU == AS3525v2 +/* on AMSv2 we can enable PLLB for MCLK to increase PCM sample rate accuracy + with no significant impact on battery life */ +#define AS3525_MCLK_SEL AS3525_CLK_PLLB +#else #define AS3525_MCLK_SEL AS3525_CLK_PLLA +#endif /* CONFIG_CPU == AS3525v2 */ + #if (AS3525_MCLK_SEL==AS3525_CLK_PLLA) #define AS3525_MCLK_FREQ AS3525_PLLA_FREQ #elif (AS3525_MCLK_SEL==AS3525_CLK_PLLB) |