MCP2221 HID Library

This is a library for interfacing with the HID features of the MCP2221 USB to UART and I2C/SMBus serial converter from Microchip. The converter includes 4 GPIO pins, 3x 10-bit ADCs, 1x 5-bit DAC and more.

Microchip does provide a library for interfacing with the chip, however it is supplied as proprietary DLLs. This project aims to be an open-source and multi-platform alternative.

This library also makes use of HIDAPI.

Documentation

Doxygen pages

Hint:

Setting up

Using pre-built binaries

• Copy libmcp2221.h to your compilers include directory (/usr/include/ on Linux)
• Windows: Copy ./lib/win/libmcp2221.dll to your compilers lib directory. Each program that uses libmcp2221 will need a copy of libmcp2221.dll in the same directory.
• Linux: Copy ./lib/unix/libmcp2221.so and ./lib/unix/libmcp2221.a to /usr/lib/ (these were compiled on Debian 8.4 x64 using the HIDRAW version of HIDAPI)

Compiling

• Download hid.c for your OS from https://github.com/signal11/hidapi (Windows | Linux (HIDRAW) | Linux (LibUSB - this doesn't seem to work at the moment) | Mac) and hidapi.h
• Place hid.c and hidapi.h files into the libmcp2221 directory
• Linux HIDAPI requires dev packages for libudev and libusb apt-get install libudev-dev libusb-1.0-0-dev
• Run make
• Copy libmcp2221.h to your compilers include directory (/usr/include/ on Linux)
• Windows: Copy libmcp2221.dll from the bin folder to your compilers lib directory. Each program that uses libmcp2221 will need a copy of libmcp2221.dll in the same directory.
• Linux: Copy libmcp2221.so and libmcp2221.a from the bin folder to /usr/lib/

Third party contents are copyrighted by their respective authors.

My productions are published under GNU GPL v3 (see License.txt).

MCP2221 HID Library

Zak Kemble

[email protected]