Eagle C Makefile

README.md

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.

Feature Status
ADC Supported
DAC Supported
GPIO Supported
Interrupt input Supported
Clock reference output Supported
USB Descriptors (Manufacturer, product, serial, VID, PID) Supported
I2C/SMB Limited support, WIP
Flash password protection Not yet implemented
C++ and C# wrappers Not yet implemented

Documentation

Doxygen pages

Hint:

Function prefix Description
mcp2221_set* Set SRAM config, this takes immediate effect
mcp2221_get* Get SRAM config
mcp2221_save* Writes to flash, this setting is used at startup
mcp2221_load* Read from flash
mcp2221_read* Read ADC/GPIO/interrupt values

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

contact@zakkemble.co.uk