From 7e26f31e221665ee059b02fc6beda025d39d6e75 Mon Sep 17 00:00:00 2001
From: David Phillips <david@yeah.nah.nz>
Date: Sun, 13 Dec 2020 16:35:58 +1300
Subject: Initial prototype

This patch adds a skeleton of AVR code for a "simulator" target (atmega2560)
and for the real intended hardware target (atmega32u4). The simulator target
is one that is supported by the QEMU AVR emulator, while the 32u4 is currently
not.
---
 Makefile | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Makefile

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..879452f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,54 @@
+CC ?= avr-gcc
+OBJCOPY ?= avr-objcopy
+AVRDUDE ?= avrdude
+QEMU_AVR ?= qemu-system-avr
+
+MCU ?= atmega32u4
+SIM_MCU ?= atmega2560
+CFLAGS += -DF_CPU=16000000UL -mmcu=$(MCU) -O3
+SIM_CFLAGS += -DF_CPU=16000000UL -mmcu=$(SIM_MCU) -g3 -gdwarf-2
+
+$(shell mkdir -p build/{real,sim})
+
+all: build/altimeter_sim.elf build/altimeter.hex
+
+emu: build/altimeter_sim.elf
+	$(QEMU_AVR) -s -S -nographic -machine mega2560 -bios $<
+
+flash: build/altimeter.hex
+	$(AVRDUDE) -F -V -c avr109 -p $(MCU) -P $(PORT) -b 115200 -U flash:w:$<
+
+clean:
+	rm -rf build/
+
+build/altimeter.elf: \
+	build/real/barometer_sim.o \
+	build/real/display_sim.o \
+	build/real/altimeter.o \
+	build/real/util.o
+	$(CC) -o $@ $^ $(CFLAGS)
+
+build/altimeter_sim.elf: \
+	build/sim/barometer_sim.o \
+	build/sim/display_sim.o \
+	build/sim/altimeter.o \
+	build/sim/util.o
+	$(CC) -o $@ $^ $(SIM_CFLAGS)
+
+include config.mk
+
+
+build/sim/%.o: %.c
+	$(CC) -c -o $@ $^ $(SIM_CFLAGS)
+
+build/real/%.o: %.c
+	$(CC) -c -o $@ $^ $(CFLAGS)
+
+build/%.hex: build/%.elf
+	$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+build/%.elf:
+	$(CC) -o $@ $^ $(CFLAGS)
+
+
+.PHONY: all emu flash clean
-- 
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