I wrote drivers for the following devices:

 * '''DC-motors''' - Both on/off cw/ccw and PWM drive.
 * '''Stepper motors''' - With real-time stepping control, dynamic acceleration ramps, homing state-machine, etc.

 * '''7-segement BCD and british-flag alphanumerical displays'''
 * '''Alphanumerical LCD displays''' - Like the popular Hitachi HD44xxx controller.
 * '''B/W bitmap LCD displays''' - Using a homebrew library to draw text and graphics (see DevLib).
 * '''Thermal Printers''' - Both serial and full printing head control.
 * '''Keyboards''' - Simple and matrix scan, with debounce and complex input gestures.

 * '''A/D converters''' - Interrupt-driven, high-speed sampling and data processing
 * '''D/A converters''' - Employing PWMs and other techniques

 * '''Serial ports''' - RS232, RS485, SPI, I2C and many other custom serial lines, both interrupt-driven and software buffered.
 * '''Ethernet''' - CS8900A and RTL8019 (NE2000 compatible).
 * '''USB''' - With HCI drivers provided by manufacturer.

A few sample drivers for generic devices are available in DevLib.