Add support for producing UF2-format binaries. (#12435)

* First stab at enabling builds of UF2-format binaries.

* Add description on producing a UF2 file.

1 files changed, 25 insertions, 6 deletions

diff --git a/tmk_core/rules.mk b/tmk_core/rules.mk
index bbcfc1e4d1..8dbed35fb5 100644
--- a/tmk_core/rules.mk
+++ b/tmk_core/rules.mk
@@ -223,6 +223,12 @@ ifneq ($(filter Darwin FreeBSD,$(shell uname -s)),)
   MD5SUM = md5
 endif
 
+# UF2 format settings
+# To produce a UF2 file in your build, add to your keyboard's rules.mk:
+#      FIRMWARE_FORMAT = uf2
+UF2CONV = $(TOP_DIR)/util/uf2conv.py
+UF2_FAMILY ?= 0x0
+
 # Compiler flags to generate dependency files.
 #GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d
 GENDEPFLAGS = -MMD -MP -MF $(patsubst %.o,%.td,$@)
@@ -255,6 +261,7 @@ DFU_SUFFIX_ARGS ?=
 
 elf: $(BUILD_DIR)/$(TARGET).elf
 hex: $(BUILD_DIR)/$(TARGET).hex
+uf2: $(BUILD_DIR)/$(TARGET).uf2
 cpfirmware: $(FIRMWARE_FORMAT)
 	$(SILENT) || printf "Copying $(TARGET).$(FIRMWARE_FORMAT) to qmk_firmware folder" | $(AWK_CMD)
 	$(COPY) $(BUILD_DIR)/$(TARGET).$(FIRMWARE_FORMAT) $(TARGET).$(FIRMWARE_FORMAT) && $(PRINT_OK)
@@ -283,32 +290,44 @@ gccversion :
 
 # Create final output files (.hex, .eep) from ELF output file.
 %.hex: %.elf
-	@$(SILENT) || printf "$(MSG_FLASH) $@" | $(AWK_CMD)
 	$(eval CMD=$(HEX) $< $@)
+	#@$(SILENT) || printf "$(MSG_EXECUTING) '$(CMD)':\n"
+	@$(SILENT) || printf "$(MSG_FLASH) $@" | $(AWK_CMD)
+	@$(BUILD_CMD)
+
+%.uf2: %.hex
+	$(eval CMD=$(UF2CONV) $(BUILD_DIR)/$(TARGET).hex -o $(BUILD_DIR)/$(TARGET).uf2 -c -f $(UF2_FAMILY) >/dev/null 2>&1)
+	#@$(SILENT) || printf "$(MSG_EXECUTING) '$(CMD)':\n"
+	@$(SILENT) || printf "$(MSG_UF2) $@" | $(AWK_CMD)
 	@$(BUILD_CMD)
 
 %.eep: %.elf
-	@$(SILENT) || printf "$(MSG_EEPROM) $@" | $(AWK_CMD)
 	$(eval CMD=$(EEP) $< $@ || exit 0)
+	#@$(SILENT) || printf "$(MSG_EXECUTING) '$(CMD)':\n"
+	@$(SILENT) || printf "$(MSG_EEPROM) $@" | $(AWK_CMD)
 	@$(BUILD_CMD)
 
 # Create extended listing file from ELF output file.
 %.lss: %.elf
-	@$(SILENT) || printf "$(MSG_EXTENDED_LISTING) $@" | $(AWK_CMD)
 	$(eval CMD=$(OBJDUMP) -h -S -z $< > $@)
+	#@$(SILENT) || printf "$(MSG_EXECUTING) '$(CMD)':\n"
+	@$(SILENT) || printf "$(MSG_EXTENDED_LISTING) $@" | $(AWK_CMD)
 	@$(BUILD_CMD)
 
 # Create a symbol table from ELF output file.
 %.sym: %.elf
-	@$(SILENT) || printf "$(MSG_SYMBOL_TABLE) $@" | $(AWK_CMD)
 	$(eval CMD=$(NM) -n $< > $@ )
+	#@$(SILENT) || printf "$(MSG_EXECUTING) '$(CMD)':\n"
+	@$(SILENT) || printf "$(MSG_SYMBOL_TABLE) $@" | $(AWK_CMD)
 	@$(BUILD_CMD)
 
 %.bin: %.elf
-	@$(SILENT) || printf "$(MSG_BIN) $@" | $(AWK_CMD)
 	$(eval CMD=$(BIN) $< $@ || exit 0)
+	#@$(SILENT) || printf "$(MSG_EXECUTING) '$(CMD)':\n"
+	@$(SILENT) || printf "$(MSG_BIN) $@" | $(AWK_CMD)
 	@$(BUILD_CMD)
 	if [ ! -z "$(DFU_SUFFIX_ARGS)" ]; then \
+		#$(SILENT) || printf "$(MSG_EXECUTING) '$(DFU_SUFFIX) $(DFU_SUFFIX_ARGS) -a $(BUILD_DIR)/$(TARGET).bin 1>/dev/null':\n" ;\
 		$(DFU_SUFFIX) $(DFU_SUFFIX_ARGS) -a $(BUILD_DIR)/$(TARGET).bin 1>/dev/null ;\
 	fi
 	$(COPY) $(BUILD_DIR)/$(TARGET).bin $(TARGET).bin;
@@ -476,7 +495,7 @@ $(eval $(foreach OUTPUT,$(OUTPUTS),$(shell mkdir -p $(OUTPUT) 2>/dev/null)))
 
 # Listing of phony targets.
 .PHONY : all dump_vars finish sizebefore sizeafter qmkversion \
-gccversion build elf hex eep lss sym coff extcoff \
+gccversion build elf hex uf2 eep lss sym coff extcoff \
 clean clean_list debug gdb-config show_path \
 program teensy dfu dfu-ee dfu-start \
 flash dfu-split-left dfu-split-right \