pkg/cmsis-dsp: Add package for CMSIS DSP library

pkg/cmsis-dsp/Makefile

@@ -0,0 +1,34 @@
+PKG_NAME=cmsis-dsp
+PKG_URL=https://github.com/gebart/CMSIS-DSP.git
+PKG_VERSION=v1.4.5-riot1
+PKG_DIR=$(CURDIR)/$(PKG_NAME)
+
+ifneq ($(RIOTBASE),)
+include $(RIOTBASE)/Makefile.base
+endif
+
+.PHONY: all clean patch distclean
+
+all: $(PKG_DIR)/Makefile
+	$(MAKE) -C $(CURDIR)/$(PKG_NAME)
+
+$(PKG_DIR)/Makefile: $(PKG_DIR)/.git/config
+	@
+
+$(PKG_DIR)/.git/config:
+	test -d "$(PKG_DIR)" || git clone "$(PKG_URL)" "$(PKG_DIR)"; \
+		cd "$(PKG_DIR)" && git checkout -f "$(PKG_VERSION)"
+
+$(CURDIR)/$(PKG_NAME) $(PKG_NAME):
+	# Get PKG_VERSION of package from PKG_URL
+	git clone '$(PKG_URL)' '$(PKG_NAME)' && cd '$(PKG_NAME)' && git reset --hard '$(PKG_VERSION)'
+
+clean::
+	@echo "Cleaning up $(PKG_NAME) package..."
+	@-cd "$(PKG_DIR)" 2> /dev/null > /dev/null && \
+		git clean -x -f && \
+		git am --abort && \
+		git reset --hard "$(PKG_VERSION)"
+
+distclean::
+	rm -rf "$(PKG_DIR)"

pkg/cmsis-dsp/Makefile.include

@@ -0,0 +1 @@
+INCLUDES += -I$(RIOTBASE)/pkg/cmsis-dsp/cmsis-dsp/include

pkg/cmsis-dsp/README.md

@@ -0,0 +1 @@
+Since there is no official public repository for the CMSIS-DSP library, we are using our own repo.