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I2S: Use 8 MHz oscillator source if 48MHz divider does not fit in 8 bits

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This commit is contained in:
Sandeep Mistry 2018-03-22 15:19:32 -04:00 committed by Cristian Maglie
parent e7ebbdfcb1
commit 09f867e86d
1 changed files with 11 additions and 2 deletions
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13
libraries/I2S/src/I2S.cpp
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@ -398,15 +398,24 @@ void I2SClass::onReceive(void(*function)(void))
void I2SClass::enableClock(int divider)
{
int div = SystemCoreClock / divider;
int src = GCLK_GENCTRL_SRC_DFLL48M_Val;
if (div > 255) {
// divider is too big, use 8 MHz oscillator instead
div = 8000000 / divider;
src = GCLK_GENCTRL_SRC_OSC8M_Val;
}
// configure the clock divider
while (GCLK->STATUS.bit.SYNCBUSY);
GCLK->GENDIV.bit.ID = _clockGenerator;
GCLK->GENDIV.bit.DIV = SystemCoreClock / divider;
GCLK->GENDIV.bit.DIV = div;
// use the DFLL as the source
while (GCLK->STATUS.bit.SYNCBUSY);
GCLK->GENCTRL.bit.ID = _clockGenerator;
GCLK->GENCTRL.bit.SRC = GCLK_GENCTRL_SRC_DFLL48M_Val;
GCLK->GENCTRL.bit.SRC = src;
GCLK->GENCTRL.bit.IDC = 1;
GCLK->GENCTRL.bit.GENEN = 1;