如何在使用 Circuit Python 时使 Raspberry Pico 不自动挂载为 USB 存储器

问题描述

我在 RaspBerry Pi Pico 上使用 Circuit Python 来为我提供键盘快捷键的硬件按钮。我使用的是 Circuit Python 而不是 MicroPython，因为它具有 USB_HID 库。

我不希望 Pico 在插入时自动挂载为 USB 存储设备。我只希望它充当 HID 设备。我知道除了 code.py 之外，我还可以编写 boot.py 脚本，但我无法在网上找到任何可以防止它安装为 USB 设备的内容。有时我仍然希望它作为 USB 安装（当按下按钮/连接 GPIO 引脚时），所以我仍然有办法更改设备上的代码。

这可能吗？并且，如果是这样，那么只有在连接了某个 GPIO 引脚时，boot.py 应该是什么样子的？

解决方法

我最近遇到了一个需要做你正在寻找的同样的事情，在一个不错的兔子洞之后，我决定现在不能做。

https://github.com/adafruit/circuitpython/issues/1015

看起来请求是在几年前打开的，现在仍然列为打开状态。

我不确定在“小工具”模式下运行 pi 零是否可以实现这一点，但可能值得一看

,

CircuitPython 学习指南的这一部分涵盖了这一点：https://learn.adafruit.com/circuitpython-essentials/circuitpython-storage

,

这是一个很好的 HID 指南：

https://learn.adafruit.com/circuitpython-essentials/circuitpython-hid-keyboard-and-mouse

这是 HID 示例：

import time

import board
import digitalio
import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
from adafruit_hid.keycode import Keycode

# A simple neat keyboard demo in CircuitPython

# The pins we'll use,each will have an internal pullup
keypress_pins = [board.A1,board.A2]
# Our array of key objects
key_pin_array = []
# The Keycode sent for each button,will be paired with a control key
keys_pressed = [Keycode.A,"Hello World!\n"]
control_key = Keycode.SHIFT

# The keyboard object!
time.sleep(1)  # Sleep for a bit to avoid a race condition on some systems
keyboard = Keyboard(usb_hid.devices)
keyboard_layout = KeyboardLayoutUS(keyboard)  # We're in the US :)

# Make all pin objects inputs with pullups
for pin in keypress_pins:
    key_pin = digitalio.DigitalInOut(pin)
    key_pin.direction = digitalio.Direction.INPUT
    key_pin.pull = digitalio.Pull.UP
    key_pin_array.append(key_pin)

# For most CircuitPython boards:
led = digitalio.DigitalInOut(board.D13)
# For QT Py M0:
# led = digitalio.DigitalInOut(board.SCK)
led.direction = digitalio.Direction.OUTPUT

print("Waiting for key pin...")

while True:
    # Check each pin
    for key_pin in key_pin_array:
        if not key_pin.value:  # Is it grounded?
            i = key_pin_array.index(key_pin)
            print("Pin #%d is grounded." % i)

            # Turn on the red LED
            led.value = True

            while not key_pin.value:
                pass  # Wait for it to be ungrounded!
            # "Type" the Keycode or string
            key = keys_pressed[i]  # Get the corresponding Keycode or string
            if isinstance(key,str):  # If it's a string...
                keyboard_layout.write(key)  # ...Print the string
            else:  # If it's not a string...
                keyboard.press(control_key,key)  # "Press"...
                keyboard.release_all()  # ..."Release"!

            # Turn off the red LED
            led.value = False

    time.sleep(0.01) ```

The example only prints Hello World,so it's not very useful,but it's a good base to mod.