The definitions are C++11 header-only and expose hardware metadata.

Include

#define MCU_PACKAGE_TQFP100
#define MCU_GRADE_INDUSTRIAL_85C
#include <atmega2560/ATmega2560.h>
namespace mcu = atmega2560;
 
static_assert(mcu::gpio::port_count == 11, "GPIO ports");
static_assert(mcu::usart::module_count == 4, "USART count");
static_assert(mcu::register_map::PORTB == 0x25, "Data-space address");

Add include/ to the compiler search path. Include only the headers you need, or include the aggregate header.

Addresses and pins

register_map values are data-space addresses. They are not compiler intrinsics or volatile register objects. pin::Pin values encode logical MCU port and bit, not Arduino board pin numbers.

Package

Choose MCU_PACKAGE_TQFP100 or MCU_PACKAGE_CBGA100 before any definition header. package::selected exposes package metadata.