21. Lektion: Pin's

Was bietet uns die Klasse Pin?

Im M5Microphyton:

>>> import machine
>>> dir(machine.Pin)
['__class__', '__name__', 'value', '__bases__', '__dict__', 'IN', 'IRQ_FALLING', 'IRQ_RISING', 'OPEN_DRAIN', 
'OUT', 'PULL_DOWN', 'PULL_HOLD', 'PULL_UP', 'WAKE_HIGH', 'WAKE_LOW', 'init', 'irq', 'off', 'on']

Im Raspi Microphyton:

>>> import machine
>>> dir(machine.Pin)
['__class__', '__name__', 'value', '__bases__', '__dict__', 'ALT', 'ALT_GPCK', 'ALT_I2C', 'ALT_PIO0', 'ALT_PIO1', 
'ALT_PWM', 'ALT_SIO', 'ALT_SPI', 'ALT_UART', 'ALT_USB', 'IN', 'IRQ_FALLING', 'IRQ_RISING', 'OPEN_DRAIN', 
'OUT', 'PULL_DOWN', 'PULL_UP', 'board', 'cpu', 'high', 'init', 'irq', 'low', 'off', 'on', 'toggle']

Pins initialisieren.

So sieht eine umfangreiche Initialisierung aus:

machine.Pin(id, mode=- 1, pull=- 1, *, value=None, drive=0, alt=- 1)

Üblicherweise reicht diese Kurzform:

from machine import Pin
p0 = Pin(0, Pin.OUT)
p2 = Pin(2, Pin.IN, Pin.PULL_UP)

Bedeutung der Parameter:

id

Nummer des Pin (GPIOxx)

mode

Pin.IN, Pin.OUT, Pin.OPEN_DRAIN

pull

None, Pin.PULL_UP, Pin.PULL_DOWN

Pins als Eingang

Taster abfragen.

https://docs.m5stack.com/en/mpy/official/machine