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Changelog

EasyMCP2221.Device

V1.6

V1.6.2

ADC/DAC:
  • Fixed bug: when ADC reference is VDD and DAC reference is VRM and a new GPIO configuration is applied, DAC stops working. It seems to be related with a known MCP limitation.
  • Fixed bug: Restore DAC reference value after reset.
  • In some cases MCP2221A's firmware does not restore DAC or ADC pin assignment when it boots. Software workaround.
I2C:
  • Deprecated I2C_cancel and I2C_is_idle. Bus is now managed automatically. You can use _i2c_release and _i2c_status as replacement if needed.
  • Fixed. Low SCL and low SDA exceptions were swapped.
  • When the I2C bus detects SDA activity, the next transfer does not work fine. Prevented via software. See _i2c_status.
Documentation:
  • Instructions and schematic for testing in the install section.
  • Replaced PNG schematics by SVG versions in examples.
  • Troubleshooting section to run as an unprivileged user in Linux (udev rule).
  • Added developers section with details about I2C transfers. See internals.
Misc:
  • Added test suite.
  • Added IOC edge detection setting in device representation.
  • Fixed. Bug when reset a device with customized VID/PID.
  • Multiple tries to find the device after a reset (until timeout).

V1.6.1

Improved USB stability:
  • Added timeout in HID read.
  • Added retries in send_cmd.
  • Better USB trace_commands output format.
  • Removed sleep parameter in send_cmd.
GPIO / ADC and DAC:
  • GPIO output values given with GPIO_write function are now preserved when calling SRAM_config (like to change DAC value, or pin function).
  • Restore ADC/DAC Vref when calling SRAM_config (see limitations_bugs).
  • Reload Vrm after power-up according to saved configuration.
More reliable I2C functions:
  • Rewritten I2C_read to take into account internal I2C engine status.
  • Rewritten I2C_write to prevent infinite loop, quicker write and ACK checking.
  • Timeout and early failure check in read and write to prevent infinite loop.
  • Custom exceptions for better error handling (see Exceptions in api_reference)
  • Automatically try to recover from an I2C error in past operation.
New features:
  • Function to save current state: save_config.
  • Added speed parameter in I2C Slave class.
Documentation:
  • Removed self argument from autodoc methods.
  • Added pictures and schematics.
  • Added MCP2221 pinout guide.
  • Added advanced ADC/DAC examples section.
  • Added license.
  • Corrected typos.
  • Formatting.

V1.6.0

Released 1.5.1 again by mistake.

V1.5

V1.5.1

Add I2C Slave helper class.

V1.5.0

First EasyMCP2221 version.

Older releases

This project was initially a fork of PyMCP2221A library by Yuta KItagami (https://github.com/nonNoise/PyMCP2221A).

I made a few changes, then a few more, until I ended up rewriting almost all the code. Since the API is no longer compatible with PyMCP2221A, I decided to create a new package.

Tags v1.4 and earlier are from PyMCP2221A.