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I2S clock for mcHF STM32F4 corrected to 12.288Mhz #1464

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merged 1 commit into from
Feb 26, 2018

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@db4ple db4ple commented Feb 26, 2018

Found working clock configuration which provides exactly 12.288 Mhz as I2S
clock and not something slightly lower as before. This may reduce USB audio
issues but still depends on accurate clocks on BOTH ends of the USB
connection (which is never a 100% match). However, for most mcHF USB audio
user this should improve audio quality. No impact on OVI40 which already
uses the correct 12.288Mhz clock. See discussion on #1077
BTW: The previous "official" difference was about 0.01% or 100ppm.

Found working clock configuration which provides exactly 12.288 Mhz as I2S
clock and not something slightly lower as before. This may reduce USB audio
issues but still depends on accurate clocks on BOTH ends of the USB
connection (which is never a 100% match). However, for most mcHF USB audio
user this should improve audio quality. No impact on OVI40 which already
uses the correct 12.288Mhz clock. See discussion on df8oe#1077
@df8oe df8oe merged commit e5d32c1 into df8oe:active-devel Feb 26, 2018
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2 participants