CMakeLists.txt

cmake_minimum_required(VERSION 3.20)

# Use AVR GCC toolchain
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_CXX_COMPILER avr-g++)
set(CMAKE_C_COMPILER avr-gcc)
set(CMAKE_ASM_COMPILER avr-gcc)

# Project name
project("Kabeltester")

# Product filename
set(PRODUCT_NAME kabeltester_fw)

## AVR Chip Configuration
# 8Mhz, this should match the crystal on your board,
set(F_CPU 8000000UL)
# CPU, you can find the list here:
# https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html
set(MCU atmega2560)
# Default Baudrate for UART, read avr include/util/setbaud.h for usage
set(BAUD 9600)
# The programmer to use, read avrdude manual for list
set(PROG_TYPE avrisp2)
# Target device 
set(TARGET_DEVICE /dev/cu.usbmodem1101)

# AVR Fuses, must be in concordance with your hardware and F_CPU
# http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega2560
set(E_FUSE 0xFF)
set(H_FUSE 0x99)
set(L_FUSE 0x42)
set(LOCK_BIT 0xFF)

# Pass defines to compiler
add_definitions(
    -DF_CPU=${F_CPU}
    -DBAUD=${BAUD}
)
# mmcu MUST be passed to bot the compiler and linker, this handle the linker
set(CMAKE_EXE_LINKER_FLAGS -mmcu=${MCU})

add_compile_options(
    -mmcu=${MCU} # MCU
    -std=gnu99 # C99 standard
    -Os # optimize
    -Wall # enable warnings
    -Wno-main
    -Wundef
    -pedantic
    -Wstrict-prototypes
    -Werror
    -Wfatal-errors
    -Wl,--relax,--gc-sections
    -g
    -gdwarf-2
    -funsigned-char # a few optimizations
    -funsigned-bitfields
    -fpack-struct
    -fshort-enums
    -ffunction-sections
    -fdata-sections
    -fno-split-wide-types
    -fno-tree-scev-cprop
)

# Libraries
add_subdirectory(gpio)
add_subdirectory(serial)
add_subdirectory(interrupt)
add_subdirectory(tester)
#add_subdirectory(twi)

# Executable
add_subdirectory(src)

# Clean extra files
set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${PRODUCT_NAME}")