Initial project, blinks led on PC5 (analog input 5)

.gitignore

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+/build/
+/.clangd/
+compile_commands.json

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+
+# Project name
+project("Blink")
+
+# Product filename
+set(PRODUCT_NAME blink)
+
+set(F_CPU 16000000UL)
+set(MCU atmega328p)
+set(BAUD 9600)
+
+set(PROG_TYPE arduino)
+set(PROG_PORT /dev/ttyACM0)
+
+
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_CXX_COMPILER avr-g++)
+set(CMAKE_C_COMPILER avr-gcc)
+set(CMAKE_ASM_COMPILER avr-gcc)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+
+add_definitions(
+    -DF_CPU=${F_CPU}
+    -DBAUD=${BAUD}
+)
+
+include_directories(SYSTEM /usr/avr/include)
+
+set(CMAKE_EXE_LINKER_FLAGS -mmcu=${MCU})
+
+add_compile_options(
+    -mmcu=${MCU} # MCU
+    -std=gnu++17
+    -Os # optimize
+    -Wall # enable warnings
+    -Wno-main
+    -Wundef
+    -pedantic
+    -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
+)
+
+# Create one target
+add_executable(${PRODUCT_NAME} 
+	src/blink.cpp
+)
+
+# Rename the output to .elf as we will create multiple files
+set_target_properties(${PRODUCT_NAME} PROPERTIES OUTPUT_NAME ${PRODUCT_NAME}.elf)
+
+# Strip binary for upload
+add_custom_target(strip ALL avr-strip ${PRODUCT_NAME}.elf DEPENDS ${PRODUCT_NAME})
+
+# Transform binary into hex file, we ignore the eeprom segments in the step
+add_custom_target(hex ALL avr-objcopy -R .eeprom -O ihex ${PRODUCT_NAME}.elf ${PRODUCT_NAME}.hex DEPENDS strip)
+# Transform binary into hex file, this is the eeprom part (empty if you don't
+# use eeprom static variables)
+add_custom_target(eeprom avr-objcopy -j .eeprom  --set-section-flags=.eeprom="alloc,load"  --change-section-lma .eeprom=0 -O ihex ${PRODUCT_NAME}.elf ${PRODUCT_NAME}.eep DEPENDS strip)
+
+# Upload the firmware with avrdude
+add_custom_target(upload avrdude  -c ${PROG_TYPE} -P ${PROG_PORT} -p ${MCU} -U flash:w:${PRODUCT_NAME}.hex DEPENDS hex)
+
+# Upload the eeprom with avrdude
+add_custom_target(upload_eeprom avrdude -c ${PROG_TYPE} -P ${PROG_PORT} -p ${MCU}  -U eeprom:w:${PRODUCT_NAME}.eep DEPENDS eeprom)
+
+# Clean extra files
+set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${PRODUCT_NAME}.hex;${PRODUCT_NAME}.eeprom;${PRODUCT_NAME}.lst")

src/blink.cpp

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+#include <avr/io.h>
+#include <util/delay.h>
+
+int main()
+{
+	DDRC |= (1 << PC5);
+
+	while (true)
+	{
+		PORTC ^= (1 << PC5);
+		_delay_ms(250);
+	}
+
+	return 0;
+}