From 1107e66c889cc62e9e7381853134448feac6e18c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sat, 8 Sep 2018 13:49:41 +0200
Subject: dice: add template for firmware

---
 dice/firmware/Makefile | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 dice/firmware/main.c   | 13 +++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 dice/firmware/Makefile
 create mode 100644 dice/firmware/main.c

diff --git a/dice/firmware/Makefile b/dice/firmware/Makefile
new file mode 100644
index 0000000..80cffce
--- /dev/null
+++ b/dice/firmware/Makefile
@@ -0,0 +1,49 @@
+MAKEFLAGS += --no-builtin-rules --no-builtin-variables
+
+# This variable can be overwritten to show executed commands
+Q ?= @
+
+# TODO use CC instead of GCC but at the moment --no-builtin-variables seems to
+# break somehow detection of not defined variable.
+TARGET ?= avr-
+GCC ?= $(TARGET)gcc
+OBJCOPY ?= $(TARGET)objcopy
+AVRDUDE ?= avrdude
+
+MCU ?= attiny85
+F_CPU ?= 16000000L
+CFLAGS ?= -Os -mmcu=$(MCU) -DF_CPU=$(F_CPU)
+LDFLAGS ?= -Os -mmcu=$(MCU)
+
+#####################
+SRC := main.c
+#####################
+OBJ := $(patsubst %.c,%.o,$(SRC))
+
+.PHONY: all
+all: firmware.hex
+
+$(OBJ): %.o: %.c
+	@echo "CC	$@"
+	$(Q)$(GCC) -c $(CFLAGS) $< -o $@
+
+firmware.elf: $(OBJ)
+	@echo "LD	$@"
+	$(Q)$(GCC) $(LDFLAGS) $< -o $@
+
+firmware.hex: firmware.elf
+	@echo "OBJCOPY	$@"
+	$(Q)$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+
+.PHONY: install
+install: firmware.hex
+	@echo "AVRDUDE	$@"
+	$(Q)$(AVRDUDE) -p$(MCU) -cusbasp -D -Uflash:w:$<:a
+
+# TODO probably configure fuses
+
+.PHONY: clean
+clean:
+	rm -f $(OBJ)
+	rm -f firmware.elf firmware.hex
diff --git a/dice/firmware/main.c b/dice/firmware/main.c
new file mode 100644
index 0000000..6b6f6f8
--- /dev/null
+++ b/dice/firmware/main.c
@@ -0,0 +1,13 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+int main() {
+	DDRB |= _BV(DDB3);
+
+	while (1) {
+		PORTB |= _BV(PORTB3);
+		_delay_ms(500);
+		PORTB &= ~_BV(PORTB3);
+		_delay_ms(500);
+	}
+}
-- 
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