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