# ###############################
# AVR-GCC toolchain file 
# ###############################

# Specify the cross-compiler
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_PROCESSOR avr)

# Without this flag, CMake is unable to pass the test compilation check
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

# Specify the compiler and linker
#set(AVR_MCU atmega328p) # The old Classic
#set(AVR_MCU attiny85) # The older ATtiny series, avr25
set(AVR_MCU attiny404) # this is the avrxmega3 series
#set(AVR_MCU avr64dd28) # Newer DX series, avrxmega2

# The default frequency of an 328p devboard using the external crystal.
#set(F_CPU 16000000UL)
set(F_CPU 20000000UL)
#set(F_CPU 8000000)
#set(F_PER 3333333)
add_compile_definitions(F_CPU=${F_CPU})
# add_compile_definitions(MCU=atmega328p)
#add_compile_definitions(__AVR_ATmega328P__)
add_compile_definitions(__AVR_ATtiny404__)

# Set up the programmer for it
#set(PROGRAMMER usbasp-clone)
#set(PROGRAMMER arduino)
set(PROGRAMMER serialupdi)


# Set the Port for the programmer
set(PORT /dev/ttyUSB0)


# Define the toolchain executables
set(CMAKE_C_COMPILER avr-gcc)
set(CMAKE_CXX_COMPILER avr-g++)
set(CMAKE_ASM_COMPILER avr-gcc)
set(CMAKE_LINKER avr-ld)
set(CMAKE_OBJCOPY avr-objcopy)
set(CMAKE_SIZE avr-size)


# Define compile options
set(CMAKE_C_FLAGS " -Os -mmcu=${AVR_MCU} -DF_CPU=${F_CPU}")
set(CMAKE_CXX_FLAGS "-mmcu=${AVR_MCU} -DF_CPU=${F_CPU}")
set(CMAKE_EXE_LINKER_FLAGS_INIT "-mmcu=${AVR_MCU}")


# Define the archiver and other tools
set(CMAKE_AR avr-ar)
set(CMAKE_RANLIB avr-ranlib)