Introduction

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CircuitPython BlockDevice for USB mass storage devices

Dependencies

This driver depends on:

• Adafruit CircuitPython 9.0.0 and later <https://github.com/adafruit/circuitpython>_

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle <https://circuitpython.org/libraries> or individual libraries can be installed using circup <https://github.com/adafruit/circup>.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI <https://pypi.org/project/adafruit-circuitpython-usb-host-mass-storage/>_. To install for current user:

.. code-block:: shell

pip3 install adafruit-circuitpython-usb-host-mass-storage

To install system-wide (this may be required in some cases):

.. code-block:: shell

sudo pip3 install adafruit-circuitpython-usb-host-mass-storage

To install in a virtual environment in your current project:

.. code-block:: shell

mkdir project-name && cd project-name
python3 -m venv .venv
source .env/bin/activate
pip3 install adafruit-circuitpython-usb-host-mass-storage

Installing to a Connected CircuitPython Device with Circup

Make sure that you have circup installed in your Python environment. Install it with the following command if necessary:

.. code-block:: shell

pip3 install circup

With circup installed and your CircuitPython device connected use the following command to install:

.. code-block:: shell

circup install adafruit_usb_host_mass_storage

Or the following command to update an existing version:

.. code-block:: shell

circup update

Usage Example

Print basic information about a device and its first (and usually only) configuration.

.. code-block:: python

import usb.core
import os
import storage
import time

from adafruit_usb_host_descriptors import *

DIR_IN = 0x80

while True:
    print("searching for devices")
    for device in usb.core.find(find_all=True):
        print("pid", hex(device.idProduct))
        print("vid", hex(device.idVendor))
        print("man", device.manufacturer)
        print("product", device.product)
        print("serial", device.serial_number)
        print("config[0]:")
        config_descriptor = get_configuration_descriptor(device, 0)

        i = 0
        while i < len(config_descriptor):
            descriptor_len = config_descriptor[i]
            descriptor_type = config_descriptor[i + 1]
            if descriptor_type == DESC_CONFIGURATION:
                config_value = config_descriptor[i + 5]
                print(f" value {config_value:d}")
            elif descriptor_type == DESC_INTERFACE:
                interface_number = config_descriptor[i + 2]
                interface_class = config_descriptor[i + 5]
                interface_subclass = config_descriptor[i + 6]
                print(f" interface[{interface_number:d}] class {interface_class:02x} subclass {interface_subclass:02x}")
            elif descriptor_type == DESC_ENDPOINT:
                endpoint_address = config_descriptor[i + 2]
                if endpoint_address & DIR_IN:
                    print(f"  IN {endpoint_address:02x}")
                else:
                    print(f"  OUT {endpoint_address:02x}")
            i += descriptor_len
        print()
    time.sleep(5)

Documentation

API documentation for this library can be found on Read the Docs <https://docs.circuitpython.org/projects/usb-host-mass-storage/en/latest/>_.

For information on building library documentation, please check out this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>_.

Contributing

Contributions are welcome! Please read our Code of Conduct <https://github.com/adafruit/Adafruit_CircuitPython_USB_Host_Mass_Storage/blob/HEAD/CODE_OF_CONDUCT.md>_ before contributing to help this project stay welcoming.