avr-modular-system — a modular AVR driver library

avr-modular-system collects AVR peripheral drivers in C, with the modules and the protocols organized into separate directories.

The modules cover I2C (with the AT24C256 EEPROM), SPI, the ST7735S and ST7789 displays, the PCF8574 I/O expander, and the CP2102 USB-to-serial bridge. There are also routines for drawing geometric shapes and a serial-communication project with a GUI, plus clock (F_CPU) and SPI prescaler configuration.

avr-modular-system is on GitHub.