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 |
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 |
- Copy
libmcp2221.hto your compilers include directory (/usr/include/on Linux) - Windows: Copy
./lib/win/libmcp2221.dllto your compilers lib directory. Each program that uses libmcp2221 will need a copy oflibmcp2221.dllin the same directory. - Linux: Copy
./lib/unix/libmcp2221.soand./lib/unix/libmcp2221.ato/usr/lib/(these were compiled on Debian 8.4 x64 using the HIDRAW version of HIDAPI)
- 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.candhidapi.hfiles 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.hto your compilers include directory (/usr/include/on Linux) - Windows: Copy
libmcp2221.dllfrom the bin folder to your compilers lib directory. Each program that uses libmcp2221 will need a copy oflibmcp2221.dllin the same directory. - Linux: Copy
libmcp2221.soandlibmcp2221.afrom 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).
Zak Kemble