MCP2221A python test

Table of Contents

• 1. Implemented
• 2. Dependencies
• 3. Examples
  • 3.1. testGpio.py
  • 3.2. setDescriptorStrings.py
  • 3.3. setFlashGpioSettings.py
• 4. MCP2221A.py

• Really simple python scripts to test MCP2221A

• Tested with Python 3.9.5

• Starting point of this code was taken from twitchyliquid64 - mcp2221a_set_strings.py

1. Implemented

• ✓ Setting USB descriptor strings

• ✓ Controlling GP as outputs/inputs (for now only one option is possible for all pins)

• ✓ Setting default GP configuration (the one active after power-up)

• ❏ DAC

• ❏ ADC

• ❏ I2C

2. Dependencies

• pyusb: python -m pip install pyusb

• libusb:

  • Arch Linux: sudo pacman -S libusb

• On Linux you need to add MCP2221A to udev rules:

  1. Copy 99-MCP2221A.rules: sudo cp 99-MCP2221A.rules /etc/udev/rules.d/

  2. Log out then back in

3. Examples

3.1. testGpio.py

• Test GP as input or output

• Run: python3 testGpio.py

• Open file

3.2. setDescriptorStrings.py

• Print some MCP2221A parameters

• Set USB Manufacturer, Product and Serial Descriptor Strings (they are used during the USB enumeration)

• Run: python3 setDescriptorStrings.py

• Open file

3.3. setFlashGpioSettings.py

• Set default GPIO configuration (configuration which is active after power-up)

• Run: python3 setFlashGpioSettings.py

• Open file

4. MCP2221A.py

• Main library

• Open file