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lines changed Original file line number Diff line number Diff line change @@ -140,6 +140,9 @@ static void check_lock(busio_spi_obj_t *self) {
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//| :param int baudrate: the desired clock rate in Hertz. The actual clock rate may be higher or lower
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//| due to the granularity of available clock settings.
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//| Check the `frequency` attribute for the actual clock rate.
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+ //| **Note:** on the SAMD21, it is possible to set the baud rate to 24 MHz, but that
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+ //| speed is not guaranteed to work. 12 MHz is the next available lower speed, and is
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+ //| within spec for the SAMD21.
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//| :param int polarity: the base state of the clock line (0 or 1)
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//| :param int phase: the edge of the clock that data is captured. First (0)
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//| or second (1). Rising or falling depends on clock polarity.
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