libusbsio 2.1.4

Python wrapper around NXP LIBUSBSIO library

Python wrapper for NXP libusbsio binary library

The NXP libusbsio is a binary library for Win/Linux/MacOS systems used to exercise SPI, I2C bus and GPIO pins over USBSIO interface of NXP LPCLink2 and MCUlink Pro devices.

This Python component provides a wrapper object which encapsulates the binary library and exposes its API to Python applications.

Author: [e-mail] (https://www.nxp.com)

Dependencies

There are no dependencies to any external modules needed to use the LIBUSBSIO module.

The binary libraries use the HID_API library internally to access the USB HID interface on all supported OS platforms.

Installation

pypi.org

Use pip to download and install the package

python -m pip install libusbsio

Local

Use the following pip command to install the libusbsio module from the local NXP LIBUSBSIO installation package available at www.nxp.com:

python -m pip install dist/libusbsio-2.1.4-py3-none-any.whl

Running example code

Running the example code is easy. You do not even need to install the package, the example code will locate the module in the local directory (in ../libusbsio).

Go to examples directory and see the demo scripts there. Examine the script and the way how it creates the LIBUSBSIO object.

Without any constructor parameters, the USBSIO library is automatically located. There are also options to load the library from a given path.

from libusbsio import *
sio = LIBUSBSIO()

Use the loglevel parameter to specify logging verbosity:

import logging
from libusbsio import *

logging.basicConfig()
sio = LIBUSBSIO(loglevel=logging.INFO)

Running test code

The test code is located in the test directory and it is ready to be used with the unittest or pytest. Note that most of the tests assume that the target MCU application runs the siotest1 application test code which answers on SPI and I2C buses using a simple command/response protocol. The source code of the siotest application for different target boards is available as an optional part of the NXP MCUXpresso SDK package.

Run one of the following commands in the base 'python' directory. Note that some long duration tests and known-issues tests are skipped by default. See more in test/test_base.py main test file.

python -m unittest
.............s.......s...s...sssss.........s.
----------------------------------------------------------------------
Ran 45 tests in 11.034s

OK (skipped=9)

or:

pyttest

===================================== test session starts ======================================
platform win32 -- Python 3.8.7, pytest-6.2.3, py-1.10.0, pluggy-0.13.1
rootdir: d:\gitwork\libusbsio\python
collected 45 items

test\test_00_lib.py ..........                                                            [ 22%]
test\test_10_spi.py ...s....                                                              [ 40%]
test\test_20_i2c.py ...s...s...s...ssss                                                   [ 82%]
test\test_30_gpio.py ......s.                                                             [100%]

================================ 36 passed, 9 skipped in 11.38s ================================

History

v2.1.4 - July 2021

• Extend by low-level HID_API access, fix read buffer length when reading data.
• Refactor "PIDVID" variables, arguments and tuples to a correctly ordered "VIDPID"
• Fix example code.

v2.1.0 - April 2021

• The initial Python libusbsio library wrapper release supporting USBSIO library v2.1

---

Copyright NXP 2021