added support for cmd.exe as a shell on make.

examples/make.mk

@@ -34,9 +34,14 @@ CXX = $(CROSS_COMPILE)g++
 OBJCOPY = $(CROSS_COMPILE)objcopy
 SIZE = $(CROSS_COMPILE)size
 MKDIR = mkdir
+ifeq ($(UNAME),Windows)
+CP = copy
+RM = del
+else
 SED = sed
 CP = cp
 RM = rm
+endif
 
 #-------------- Source files and compiler flags --------------
 

examples/rules.mk

@@ -81,7 +81,11 @@ uf2: $(BUILD)/$(BOARD)-firmware.uf2
 OBJ_DIRS = $(sort $(dir $(OBJ)))
 $(OBJ): | $(OBJ_DIRS)
 $(OBJ_DIRS):
+ifeq ($(UNAME),Windows)
+	@$(MKDIR) $(subst /,\,$@)
+else
 	@$(MKDIR) -p $@
+endif
 
 $(BUILD)/$(BOARD)-firmware.elf: $(OBJ)
 	@echo LINK $@
@@ -107,6 +111,7 @@ vpath %.c . $(TOP)
 $(BUILD)/obj/%.o: %.c
 	@echo CC $(notdir $@)
 	@$(CC) $(CFLAGS) -c -MD -o $@ $<
+ifneq ($(UNAME),Windows)
 	@# The following fixes the dependency file.
 	@# See http://make.paulandlesley.org/autodep.html for details.
 	@# Regex adjusted from the above to play better with Windows paths, etc.
@@ -114,6 +119,7 @@ $(BUILD)/obj/%.o: %.c
 	  $(SED) -e 's/#.*//' -e 's/^.*:  *//' -e 's/ *\\$$//' \
 	      -e '/^$$/ d' -e 's/$$/ :/' < $(@:.o=.d) >> $(@:.o=.P); \
 	  $(RM) $(@:.o=.d)
+endif
 
 # ASM sources lower case .s
 vpath %.s . $(TOP)
@@ -134,7 +140,11 @@ size: $(BUILD)/$(BOARD)-firmware.elf
 
 .PHONY: clean
 clean:
+ifeq ($(UNAME),Windows)
+	rd /S /Q $(subst /,\,$(BUILD))
+else
 	$(RM) -rf $(BUILD)
+endif
 
 # Print out the value of a make variable.
 # https://stackoverflow.com/questions/16467718/how-to-print-out-a-variable-in-makefile

tools/top.mk

@@ -2,6 +2,12 @@ ifneq ($(lastword a b),b)
 $(error This Makefile require make 3.81 or newer)
 endif
 
+# Detect windows or not
+# https://stackoverflow.com/questions/714100/os-detecting-makefile/52062069#52062069
+ifeq '$(findstring ;,$(PATH))' ';'
+UNAME := Windows
+endif
+
 # Set TOP to be the path to get from the current directory (where make was
 # invoked) to the top of the tree. $(lastword $(MAKEFILE_LIST)) returns
 # the name of this makefile relative to where make was invoked.
@@ -9,9 +15,16 @@ endif
 THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
 TOP := $(patsubst %/tools/top.mk,%,$(THIS_MAKEFILE))
 
+ifeq ($(UNAME),Windows)
+TOP := $(subst \,/,$(shell for %%i in ( $(TOP) ) do echo %%~fi))
+else
 TOP := $(shell realpath $(TOP))
-
+endif
 #$(info Top directory is $(TOP))
 
+ifeq ($(UNAME),Windows)
+CURRENT_PATH := $(subst $(TOP)/,,$(subst \,/,$(shell echo %CD%)))
+else
 CURRENT_PATH := $(shell realpath --relative-to=$(TOP) `pwd`)
+endif
 #$(info Path from top is $(CURRENT_PATH))