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class PinAF --- Pin Alternate Functions
=======================================
A Pin represents a physical pin on the microcprocessor. Each pin
can have a variety of functions (GPIO, I2C SDA, etc). Each PinAF
object represents a particular function for a pin.
Usage Model::
x3 = pyb.Pin.board.X3
x3_af = x3.af_list()
x3_af will now contain an array of PinAF objects which are availble on
pin X3.
For the pyboard, x3_af would contain:
[Pin.AF1_TIM2, Pin.AF2_TIM5, Pin.AF3_TIM9, Pin.AF7_USART2]
Normally, each peripheral would configure the af automatically, but sometimes
the same function is available on multiple pins, and having more control
is desired.
To configure X3 to expose TIM2_CH3, you could use::
pin = pyb.Pin(pyb.Pin.board.X3, mode=pyb.Pin.AF_PP, af=pyb.Pin.AF1_TIM2)
or::
pin = pyb.Pin(pyb.Pin.board.X3, mode=pyb.Pin.AF_PP, af=1)
Methods
-------
.. method:: pinaf.__str__()
Return a string describing the alternate function.
.. method:: pinaf.index()
Return the alternate function index.
.. method:: pinaf.name()
Return the name of the alternate function.
.. method:: pinaf.reg()
Return the base register associated with the peripheral assigned to this
alternate function. For example, if the alternate function were TIM2_CH3
this would return stm.TIM2
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