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documentation: caution on SPI clock speed for SAMD21

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This commit is contained in:
Dan Halbert 2018-01-30 14:31:20 -05:00
parent 64831f4e7d
commit cc87363234
1 changed files with 3 additions and 0 deletions
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3
shared-bindings/busio/SPI.c
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@ -140,6 +140,9 @@ static void check_lock(busio_spi_obj_t *self) {
//| :param int baudrate: the desired clock rate in Hertz. The actual clock rate may be higher or lower
//| due to the granularity of available clock settings.
//| Check the `frequency` attribute for the actual clock rate.
//| **Note:** on the SAMD21, it is possible to set the baud rate to 24 MHz, but that
//| speed is not guaranteed to work. 12 MHz is the next available lower speed, and is
//| within spec for the SAMD21.
//| :param int polarity: the base state of the clock line (0 or 1)
//| :param int phase: the edge of the clock that data is captured. First (0)
//| or second (1). Rising or falling depends on clock polarity.