QRCode

https://github.com/ricmoo/QRCode

https://github.com/nayuki/QR-Code-generator

A simple library for generating QR codes in C, optimized for processing and memory constrained systems.

Features:

• Stack-based (no heap necessary; but you can use heap if you want)
• Low-memory foot print (relatively)
• Compile-time stripping of unecessary logic
• MIT License; do with this as you please