setup cmake for avr

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+
+# Project name and version
+project(tool_probe VERSION 1.0)
+
+
+# enable_language(C ASM)
+
+# toolchain file for AVR
+# set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/avr-gcc-toolchain.cmake)
+
+# Set executable name
+add_executable(${PROJECT_NAME})
+
+# generate hex file
+add_custom_command(
+    TARGET ${PROJECT_NAME} POST_BUILD
+    COMMAND avr-objcopy -O ihex -R .eeprom ${PROJECT_NAME}.elf ${PROJECT_NAME}.hex
+    COMMAND avr-size ${PROJECT_NAME}.elf
+    COMMENT "Generating HEX file"
+)
+
+# add custom target for uploading
+add_custom_target(flash
+    COMMAND avrdude -p ${AVR_MCU} -c ${AVR_PROGRAMMER} -U flash:w:${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.hex:i
+    DEPENDS ${PROJECT_NAME}
+    COMMENT "Uploading HEX file to microcontroller"
+)
+
+# Link directories setup
+target_link_directories(${PROJECT_NAME} PRIVATE
+    src
+)
+
+# Add sources to executable
+target_sources(${PROJECT_NAME} PRIVATE
+    src/main.c
+)

CMakePresets.json

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+{
+    "version": 3,
+    "configurePresets": [
+        {
+            "name": "default",
+            "hidden": true,
+            "generator": "Ninja",
+            "binaryDir": "${sourceDir}/build/${presetName}",
+            "toolchainFile": "${sourceDir}/avr-gcc-toolchain.cmake",
+            "cacheVariables": {}
+        },
+        {
+            "name": "Release",
+            "inherits": "default",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Release"
+            }
+        }
+    ],
+    "buildPresets": [
+        {
+            "name": "Release",
+            "configurePreset": "Release"
+        }
+    ]
+}

avr-gcc-toolchain.cmake

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+# CMake toolchain file for AVR microcontrollers
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR avr)
+
+set(AVR_MCU "ATtiny24")
+set(AVR_PROGRAMMER "usbasp")
+
+# compiler and linker settings
+set(CMAKE_C_COMPILER avr-gcc)
+set(CMAKE_CXX_COMPILER avr-g++)
+set(CMAKE_OBJCOPY avr-objcopy)
+set(CMAKE_SIZE_UTIL avr-size)
+
+set(CMAKE_EXECUTABLE_SUFFIX_ASM     ".elf")
+set(CMAKE_EXECUTABLE_SUFFIX_C       ".elf")
+set(CMAKE_EXECUTABLE_SUFFIX_CXX     ".elf")
+
+# compiler flags
+# set(CMAKE_C_FLAGS "-mmcu=${AVR_MCU} -Wall -Os" CACHE STRING "")
+set(CMAKE_C_FLAGS "-mmcu=${AVR_MCU} -Wall -Os -DF_CPU=8000000UL" CACHE STRING "")
+
+# compiler flags
+set(CMAKE_EXE_LINKER_FLAGS "-mmcu=${AVR_MCU}" CACHE STRING "")
+
+# 
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+####
+
+

src/main.c

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+#include <avr/io.h>
+
+int main(void)
+{
+    // Main loop
+    while (1)
+    {
+        // Do nothing
+    }
+    return 0;
+}