new makefile and avr-build

makefile

@@ -1,50 +1,28 @@
-name: AVR Build
+MCU ?= atmega644pa
+F_CPU ?= 8000000UL
 
-on:
-  push:
-    branches:
-      - dev
-      - live
-      - main
-  pull_request:
+BUILD_TYPE ?= dev
+VERSION ?= 0.1
+PREFIX ?= ENO
 
-jobs:
-  build:
-    runs-on: ubuntu-latest
+CC = avr-gcc
+OBJCOPY = avr-objcopy
 
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+SRC = src/main.c
 
-      - name: Install AVR toolchain
-        run: |
-          apt-get update
-          apt-get install -y gcc-avr avr-libc binutils-avr make cppcheck
+OUTDIR = build/$(BUILD_TYPE)
+TARGET = $(OUTDIR)/$(PREFIX)_$(VERSION)
 
-      - name: Set build type from branch
-        id: vars
-        run: |
-          BRANCH="${GITHUB_REF_NAME}"
+CFLAGS = -mmcu=$(MCU) -DF_CPU=$(F_CPU) -Os -Wall -DVERSION=\"$(VERSION)\"
 
-          if [ "$BRANCH" = "dev" ]; then
-            echo "BUILD_TYPE=dev" >> $GITHUB_ENV
-            echo "PREFIX=DEV_ENO" >> $GITHUB_ENV
-          else
-            echo "BUILD_TYPE=live" >> $GITHUB_ENV
-            echo "PREFIX=ENO" >> $GITHUB_ENV
-          fi
+all: $(TARGET).hex
 
-          echo "VERSION=${GITHUB_SHA::7}" >> $GITHUB_ENV
+$(TARGET).elf: $(SRC)
+	@mkdir -p $(OUTDIR)
+	$(CC) $(CFLAGS) $< -o $@
 
-      - name: Code check
-        run: cppcheck --enable=all --error-exitcode=1 src/
+$(TARGET).hex: $(TARGET).elf
+	$(OBJCOPY) -O ihex -R .eeprom $< $@
 
-      - name: Build firmware
-        run: |
-          make BUILD_TYPE=$BUILD_TYPE PREFIX=$PREFIX VERSION=$VERSION
-
-      - name: Upload hex
-        uses: actions/upload-artifact@v4
-        with:
-          name: firmware-${{ env.BUILD_TYPE }}
-          path: build/**/*.hex
+size: $(TARGET).elf
+	avr-size $<