digitalio – 基本数字引脚支持

digitalio 模块包含提供对基本数字 IO 的访问的类。

如果程序在使用后继续,所有类都会更改硬件状态,并且在不再需要它们时应取消初始化。为此,请调用deinit()或使用上下文管理器。有关更多信息,请参阅 Lifetime 和 ContextManagers

例如:

import digitalio
from board import *

pin = digitalio.DigitalInOut(D13)
print(pin.value)

此示例将初始化设备、读取 value 然后 deinit() 是硬件。

这是眨眼:

import digitalio
from board import *
import time

led = digitalio.DigitalInOut(D13)
led.direction = digitalio.Direction.OUTPUT
while True:
    led.value = True
    time.sleep(0.1)
    led.value = False
    time.sleep(0.1)

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class digitalio.DriveMode

定义数字引脚的驱动模式

用于定义输出数字值时使用的驱动模式的类枚举类。

PUSH_PULL :DriveMode

输出高低数字值

OPEN_DRAIN :DriveMode

输出低数字值但进入高 z 为数字高。这对于共享数字线路的 i2c 和其他协议很有用。

class digitalio.DigitalInOut(pin: microcontroller.Pin)

数字输入和输出

DigitalInOut 用于数字控制 I/O 引脚。有关引脚的模拟控制,请参阅analogio.AnalogInanalogio.AnalogOut类。

创建一个与引脚关联的新 DigitalInOut 对象。默认为无拉输入。使用switch_to_input()switch_to_output() 改变方向。

参数

pin (Pin) – 要控制的引脚

direction :Direction

引脚的方向。

设置此项将使用相应 switch_to_input()switch_to_output()方法的默认值 。如果您想在切换之前设置拉取、值或驱动模式,请改用这些方法。

value :bool

引脚的数字逻辑电平。

drive_mode :DriveMode

引脚驱动模式。之一:

pull :Optional[Pull]

引脚拉动方向。之一:

Raises

AttributeError – 如果directionOUTPUT.

deinit(self)None

关闭 DigitalInOut 并释放引脚以供其他用途。

__enter__(self)DigitalInOut

上下文管理器使用的无操作。

__exit__(self)None

退出上下文时自动取消初始化硬件。有关更多信息,请参阅 Lifetime 和 ContextManagers

switch_to_output(self, value: bool = False, drive_mode: DriveMode = DriveMode.PUSH_PULL)None

设置驱动模式和值,然后切换到写出数字值。

参数
  • value (bool) – 切换时设置的默认值

  • drive_mode (DriveMode) – 输出的驱动模式

switch_to_input(self, pull: Optional[Pull] = None)None

设置拉力,然后切换到读取数字值。

参数

pull (Pull) – 输入的拉配置

用法示例:

import digitalio
import board

switch = digitalio.DigitalInOut(board.SLIDE_SWITCH)
switch.switch_to_input(pull=digitalio.Pull.UP)
# Or, after switch_to_input
switch.pull = digitalio.Pull.UP
print(switch.value)
class digitalio.Direction

定义数字引脚的方向

类似枚举的类来定义数字值的走向。

INPUT :Direction

读入数字数据

OUTPUT :Direction

写出数字数据

class digitalio.Pull

定义数字输入引脚的拉力

类似枚举的类,用于定义在读取数字值时使用的拉取值(如果有)。

UP :Pull

当输入线没有被驱动时,上拉可以将线的状态拉高,因此它读为真。

DOWN :Pull

当输入线没有被驱动时,下拉可以将线的状态拉低,因此它读为假。