47 lines
1.3 KiB
ReStructuredText
47 lines
1.3 KiB
ReStructuredText
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.. _pins_zephyr:
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GPIO Pins
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=========
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Use :ref:`machine.Pin <machine.Pin>` to control I/O pins.
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For Zephyr, pins are initialized using a tuple of port and pin number ``(\"GPIO_x\", pin#)``
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for the ``id`` value. For example to initialize a pin for the red LED on a FRDM-k64 board::
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LED = Pin(("GPIO_1", 22), Pin.OUT)
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Reference your board's datasheet or Zephyr documentation for pin numbers, see below for more examples.
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.. list-table:: Pin Formatting
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:header-rows: 1
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* - Board
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- Pin
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- Format
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* - frdm_k64f
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- Red LED = PTB22
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- ("GPIO_1", 22)
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* - 96b_carbon
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- LED1 = PD2
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- ("GPIOD", 2)
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* - mimxrt685_evk_cm33
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- Green LED = PIO0_14
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- ("GPIO0", 14)
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Interrupts
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----------
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The Zephyr port also supports interrupt handling for Pins using `machine.Pin.irq() <machine.Pin.irq>`.
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To respond to Pin change IRQs run::
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from machine import Pin
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SW2 = Pin(("GPIO_2", 6), Pin.IN) # create Pin object for switch 2
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SW3 = Pin(("GPIO_0", 4), Pin.IN) # create Pin object for switch 3
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SW2.irq(lambda t: print("SW2 changed")) # print message when SW2 state is changed (triggers change IRQ)
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SW3.irq(lambda t: print("SW3 changed")) # print message when SW3 state is changed (triggers change IRQ)
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while True: # wait
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pass
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