From d915fd32a7becdf0f0492960fa5b241ee407aee9 Mon Sep 17 00:00:00 2001
From: Sarah Wilson <sarah@swilson.id.au>
Date: Fri, 10 Jan 2025 20:09:05 +1100
Subject: Initial version

---
 Makefile | 164 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 Makefile

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..90edd99
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,164 @@
+.PHONY: \
+	vars \
+	help \
+	clean \
+	compile \
+	link \
+	upload \
+	fuses \
+	check-fuses
+
+# Hack to get the directory this makefile is in:
+MKFILE_PATH   := $(lastword $(MAKEFILE_LIST))
+MKFILE_DIR    := $(notdir $(patsubst %/,%,$(dir $(MKFILE_PATH))))
+MKFILE_ABSDIR := $(abspath $(MKFILE_DIR))
+
+# Hack to get all *.h files into compile dependencies:
+HEADERS        = $(shell find $(MKFILE_DIR) -name "*.h")
+
+
+BUILDTMP         ?= $(MKFILE_DIR)/build-tmp
+OPTIMIZATION     ?= -Os
+AVRCC            ?= avr-gcc
+AVRDUDE          ?= avrdude
+#---------------------------------------------------------
+# AVRDUDE_FLASHARG:
+# This preserves the chip memory when updating the fuses.
+# To erase the chip when setting fuses, do:
+#
+#     make AVRDUDE_FLASHARG=-e fuses
+#
+AVRDUDE_FLASHARG ?= -D
+#---------------------------------------------------------
+AVR_SIZE         ?= avr-size
+AVR_OBJCOPY      ?= avr-objcopy
+DEVICE           ?= attiny85
+CLOCK            ?= 8000000L
+PROGRAMMER       ?= avrisp
+PORT             ?= /dev/ttyACM0
+BAUD             ?= 19200
+UNIT             ?= main.c
+FUSE_EXT         ?= 0xff
+FUSE_HIGH        ?= 0xdf
+FUSE_LOW         ?= 0xe2
+
+# Misc target info:
+help_spacing  := 12
+
+.DEFAULT_GOAL := compile
+
+#---------------------------------------------------------
+# Ensure temp directories.
+#
+# In order to ensure temp dirs exit, we include a file
+# that doesn't exist, with a target declared as PHONY
+# (above), and then have the target create our tmp dirs.
+#---------------------------------------
+-include ensure-tmp
+ensure-tmp:
+	@mkdir -p $(BUILDTMP)
+
+vars: ## Print relevant environment vars
+	@printf  "%-20.20s%s\n"  "MKFILE_PATH:"    "$(MKFILE_PATH)"
+	@printf  "%-20.20s%s\n"  "MKFILE_DIR:"     "$(MKFILE_DIR)"
+	@printf  "%-20.20s%s\n"  "MKFILE_ABSDIR:"  "$(MKFILE_ABSDIR)"
+	@printf  "%-20.20s%s\n"  "BUILDTMP:"       "$(BUILDTMP)"
+	@printf  "%-20.20s%s\n"  "OPTIMIZATION:"   "$(OPTIMIZATION)"
+	@printf  "%-20.20s%s\n"  "AVRCC:"          "$(AVRCC)"
+	@printf  "%-20.20s%s\n"  "AVRDUDE:"        "$(AVRDUDE)"
+	@printf  "%-20.20s%s\n"  "AVRDUDE_OPTS:"   "$(AVRDUDE_OPTS)"
+	@printf  "%-20.20s%s\n"  "AVR_SIZE:"       "$(AVR_SIZE)"
+	@printf  "%-20.20s%s\n"  "AVR_OBJCOPY:"    "$(AVR_OBJCOPY)"
+	@printf  "%-20.20s%s\n"  "DEVICE:"         "$(DEVICE)"
+	@printf  "%-20.20s%s\n"  "CLOCK:"          "$(CLOCK)"
+	@printf  "%-20.20s%s\n"  "PROGRAMMER:"     "$(PROGRAMMER)"
+	@printf  "%-20.20s%s\n"  "BAUD:"           "$(BAUD)"
+	@printf  "%-20.20s%s\n"  "UNIT:"           "$(UNIT)"
+
+help: ## Print this makefile help menu
+	@echo "TARGETS:"
+	@grep '^[a-z_\-]\{1,\}:.*##' $(MAKEFILE_LIST) \
+		| sed 's/^\([a-z_\-]\{1,\}\): *\(.*[^ ]\) *## *\(.*\)/\1:\t\3 (\2)/g' \
+		| sed 's/^\([a-z_\-]\{1,\}\): *## *\(.*\)/\1:\t\2/g' \
+		| awk '{$$1 = sprintf("%-$(help_spacing)s", $$1)} 1' \
+		| sed 's/^/  /'
+	@printf "\nUsage:\n    make \\ \n    %s \\ \n    %s \\ \n    %s \\ \n    %s\n" \
+		"USBDEVICE=/dev/cu.usbserial-1234" \
+		"UNIT=my_source.c" \
+		"DEVICE=<mcu>" \
+		"<make target>"
+
+clean: ## Clean build artifacts
+	rm -rf $(BUILDTMP)/*
+	rm -vf *.s
+
+compile: $(UNIT) $(HEADERS) ## Compile project
+	$(AVRCC) \
+	     -c \
+	     -Wall \
+	     $(OPTIMIZATION) \
+	     -DF_CPU=$(CLOCK) \
+	     -mmcu=$(DEVICE) \
+	     -I$(MKFILE_DIR) \
+ 	     $(UNIT) \
+	     -o $(BUILDTMP)/$(UNIT).o
+
+link: compile ## Link compilation artifacts and package for upload
+	$(AVRCC) \
+	    -w \
+	    $(OPTIMIZATION) \
+	    -flto \
+	    -fuse-linker-plugin \
+	    -Wl,--gc-sections \
+	    -mmcu=$(DEVICE) \
+	    -o $(BUILDTMP)/$(UNIT).elf \
+	    $(BUILDTMP)/$(UNIT).o \
+	    -L$(BUILDTMP) \
+	    $(LDFLAGS)
+	$(AVR_OBJCOPY) \
+	    -O ihex \
+	    -j .eeprom \
+	    --set-section-flags=.eeprom=alloc,load \
+	    --no-change-warnings \
+	    --change-section-lma .eeprom=0 \
+	    $(BUILDTMP)/$(UNIT).elf \
+	    $(BUILDTMP)/$(UNIT).eep
+	$(AVR_OBJCOPY) \
+	    -O ihex \
+	    -R .eeprom \
+	    $(BUILDTMP)/$(UNIT).elf \
+	    $(BUILDTMP)/$(UNIT).hex
+	$(AVR_SIZE) \
+	    -A $(BUILDTMP)/$(UNIT).elf
+
+upload: link ## Upload
+	$(AVRDUDE) \
+	    $(AVRDUDE_OPTS) \
+	    -v \
+	    -p$(DEVICE) \
+	    -c$(PROGRAMMER) \
+			-P${PORT} \
+	    -b$(BAUD) \
+	    -Uflash:w:$(BUILDTMP)/$(UNIT).hex:i
+
+
+fuses: ## Flash the fuses
+	$(AVRDUDE) \
+	    $(AVRDUDE_OPTS) \
+	    -v \
+	    -D \
+	    -p$(DEVICE) \
+	    -c$(PROGRAMMER) \
+			-P${PORT} \
+	    -b$(BAUD) \
+	    -Uefuse:w:$(FUSE_EXT):m \
+	    -Uhfuse:w:$(FUSE_HIGH):m \
+	    -Ulfuse:w:$(FUSE_LOW):m
+
+check-fuses: ## Verify device signature and check fuse values
+	$(AVRDUDE) \
+	    $(AVRDUDE_OPTS) \
+	    -p$(DEVICE) \
+	    -c$(PROGRAMMER) \
+			-P${PORT} \
+	    -b$(BAUD)
-- 
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