by Elliot Williams is a definitive guide for makers who want to move beyond the Arduino IDE's abstractions and program Atmel’s AVR microcontrollers at the register level . Published by Maker Media/O'Reilly in 2014, it remains a highly-rated resource for those seeking to "squeeze" more performance and efficiency out of 8-bit chips like the ATmega328p . Core Premise: Moving Past Abstraction
Use the standard , including avr-gcc for compiling, avr-libc for standard libraries, and avrdude for uploading code . Topics & Key Projects
: Direct port manipulation to build "Cylon Eyes" (LED scanners) .
: Learning low-power modes and interrupt-driven I/O for battery-operated devices . Who Is This For?
: Implementing UART (serial), SPI, and I2C/TWI .
