Fix I2S timing (#728)

BCLK was running at 50% of expected speed. Fixes #714

Fix I2S timing (#728)
BCLK was running at 50% of expected speed. Fixes #714
5ab19e9a · Earle F. Philhower, III · GitHub · 82abc76e · 5ab19e9a
Unverified Commit 5ab19e9a authored Jul 29, 2022 by Earle F. Philhower, III Committed by GitHub Jul 29, 2022
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libraries/I2S/src/I2S.cpp libraries/I2S/src/I2S.cpp +1 -1

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--- a/libraries/I2S/src/I2S.cpp
+++ b/libraries/I2S/src/I2S.cpp
@@ -78,7 +78,7 @@ bool I2S::setBuffers(size_t buffers, size_t bufferWords, int32_t silenceSample)
 bool I2S::setFrequency(int newFreq) {
    _freq = newFreq;
    if (_running) {
-        float bitClk = _freq * _bps * 2.0;
+        float bitClk = _freq * _bps * 2.0 /* channels */ * 2.0 /* edges per clock */;
        pio_sm_set_clkdiv(_pio, _sm, (float)clock_get_hz(clk_sys) / bitClk);
    }
    return true;