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Integrating MindConnect Library (MCL) to Sony Spresense Environment

Copying MCL to Spresense SDK

  • After cloning Spresense repository as told here, a new folder named "mcl" should be created in "spresense/externals".

  • Copy "mcl_core" and "mcl_connectivity" folders into the new folder "spresense/externals/mcl".

Add Kconfig, LibIncludes.mk, Library.mk Make.defs files

In "spresense/externals/mcl" folder, we need these four files (Kconfig, LibIncludes.mk, Library.mk and Make.defs).

Kconfig

For mcl_core and mcl_connectivity modules, this sample Kconfig can be used.

menu "MindConnect Library"

config EXTERNALS_MINDCONNECT_LIBRARY_CORE
    bool "MCL Core Component"
    default n
    select LIBC_FLOATINGPOINT
    ---help---
        Enable MindConnect Library Core component.

config EXTERNALS_MINDCONNECT_LIBRARY_CONNECTIVITY
    bool "MCL Connectivity Component"
    default n
    depends on EXTERNALS_MINDCONNECT_LIBRARY_CORE
    ---help---
        Enable MindConnect Library Connectivity component.

endmenu # MindConnect Library

LibIncludes.mk

For mcl_core and mcl_connectivity modules, this sample LibIncludes.mk can be used.

ifeq ($(CONFIG_EXTERNALS_MINDCONNECT_LIBRARY_CORE),y)
CFLAGS   += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" "$(SDKDIR)/../externals/mcl/mcl_core/include"}
CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" "$(SDKDIR)/../externals/mcl/mcl_core/include"}
CFLAGS += -DMCL_STATICLIB=1
CXXFLAGS += -DMCL_STATICLIB=1
endif

ifeq ($(CONFIG_EXTERNALS_MINDCONNECT_LIBRARY_CONNECTIVITY),y)
CFLAGS   += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" "$(SDKDIR)/../externals/mcl/mcl_connectivity/include"}
CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" "$(SDKDIR)/../externals/mcl/mcl_connectivity/include"}
endif

Library.mk

For mcl_core and mcl_connectivity modules, this sample Library.mk can be used.

ifeq ($(CONFIG_EXTERNALS_MINDCONNECT_LIBRARY_CORE),y)
  EXTRA_LIBPATHS += -L "$(EXTLIBDIR)$(DELIM)mcl$(DELIM)mcl_core$(DELIM)src"
  EXTRA_LIBS     += -lmcl_core
endif

ifeq ($(CONFIG_EXTERNALS_MINDCONNECT_LIBRARY_CONNECTIVITY),y)
  EXTRA_LIBPATHS += -L "$(EXTLIBDIR)$(DELIM)mcl$(DELIM)mcl_connectivity$(DELIM)src"
  EXTRA_LIBS     += -lmcl_connectivity
endif

Make.defs

For mcl_core and mcl_connectivity modules, this sample Make.defs can be used.

ifeq ($(CONFIG_EXTERNALS_MINDCONNECT_LIBRARY_CORE),y)
CONFIGURED_APPS += mcl/mcl_core/src
endif

ifeq ($(CONFIG_EXTERNALS_MINDCONNECT_LIBRARY_CONNECTIVITY),y)
CONFIGURED_APPS += mcl/mcl_connectivity/src
endif

Kconfig file in spresense/externals folder

If these directory structure changes are applied before setting up the Spresense development environment, this Kconfig file (which is autogenerated) should contain the line:

source "/<Path for spresense>/externals/mcl/Kconfig"
Otherwise, this line should be added manually.

Add Makefiles

Makefile for mcl_core

Makefile for mcl_core should be placed in "spresense/externals/mcl/mcl_core/src". Here is the sample Makefile for mcl_core module:

-include $(TOPDIR)/Make.defs
-include $(SDKDIR)/Make.defs

BIN = libmcl_core$(LIBEXT)

MCL_CORE_DIR = $(EXTERNAL_DIR)$(DELIM)mcl$(DELIM)mcl_core

CSRCS =  $(wildcard *.c)
CSRCS += ..$(DELIM)lib$(DELIM)cJSON$(DELIM)cJSON.c
CSRCS += http_client$(DELIM)basic$(DELIM)http_client_basic.c
CSRCS += http_client$(DELIM)basic$(DELIM)mbedtls$(DELIM)tls_socket_mbedtls.c
CSRCS += memory$(DELIM)standard$(DELIM)memory.c
CSRCS += crypto$(DELIM)mbedtls$(DELIM)security_mbedtls.c
CSRCS += file_util$(DELIM)standard$(DELIM)file_util.c

VPATH += :..$(DELIM)lib
VPATH += :memory$(DELIM)standard
VPATH += :http_client$(DELIM)basic
VPATH += :http_client$(DELIM)basic$(DELIM)mbedtls

ROOTDEPPATH += --dep-path .
ROOTDEPPATH += --dep-path ..$(DELIM)lib
ROOTDEPPATH += --dep-path memory$(DELIM)standard
ROOTDEPPATH += --dep-path http_client$(DELIM)basic
ROOTDEPPATH += --dep-path http_client$(DELIM)basic$(DELIM)mbedtls

ifeq ($(WINTOOL),y)
CFLAGS += -I"${shell cygpath -w $(MCL_CORE_DIR)$(DELIM)lib}"
else
CFLAGS += -I$(MCL_CORE_DIR)$(DELIM)lib
endif

include $(APPDIR)/Application.mk

Makefile for mcl_connectivity

Makefile for mcl_connectivity should be placed in "spresense/externals/mcl/mcl_connectivity/src". Here is the sample Makefile for mcl_connectivity module:

-include $(TOPDIR)/Make.defs
-include $(SDKDIR)/Make.defs

BIN = libmcl_connectivity$(LIBEXT)

CSRCS =  $(wildcard *.c)

ROOTDEPPATH = --dep-path .

include $(APPDIR)/Application.mk

mbedTLS Network Module

By default MBEDTLS_NET_C is defined and mbedTLS will use its own network module (implemented in net_sockets.c). You may choose to disable it in the configuration header file of mbedTLS and implement your own mbedtls_net_init, mbedtls_net_connect, mbedtls_net_recv, mbedtls_net_send, mbedtls_net_free functions.

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Last update: September 14, 2020