Rockbox open source high quality audio player as a Music Player Daemon
mpris
rockbox
mpd
libadwaita
audio
rust
zig
deno
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
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firmware/target/arm/as3525/clock-target.h
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firmware/target/arm/as3525/clock-target.h
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#define AS3525_PLLA_FREQ 240000000
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#define AS3525_PLLA_SETTING 0x113B
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#define AS3525_PLLB_FREQ 192000000
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#define AS3525_PLLB_FREQ 192000000 /* allows 44.1kHz with 0.04% error*/
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#define AS3525_PLLB_SETTING 0x155F
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#define AS3525_FCLK_PREDIV 0
···
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#endif /* CONFIG_CPU == AS3525v2 */
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/* MCLK */
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#if CONFIG_CPU == AS3525v2
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/* on AMSv2 we can enable PLLB for MCLK to increase PCM sample rate accuracy
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with no significant impact on battery life */
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#define AS3525_MCLK_SEL AS3525_CLK_PLLB
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#else
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#define AS3525_MCLK_SEL AS3525_CLK_PLLA
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#endif /* CONFIG_CPU == AS3525v2 */
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#if (AS3525_MCLK_SEL==AS3525_CLK_PLLA)
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#define AS3525_MCLK_FREQ AS3525_PLLA_FREQ
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#elif (AS3525_MCLK_SEL==AS3525_CLK_PLLB)