targets: add nuttx interpreter build

targets/nuttx-stm32f4/Makefile.nuttx

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+# Copyright 2016 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# use TAB-8
+
+CURDIR     = `pwd`
+NUTTX     ?= $(CURDIR)/../nuttx/nuttx
+TYPE      ?= release
+JERRYHEAP ?= 64
+STFLASH   ?= ../../stlink/st-flash
+
+NUTTXINC   = $(NUTTX)/include
+NUTTXLIB   = $(NUTTX)/lib
+INTERM     = build/obj-nuttx-stm32f4
+OUTPUT     = build/bin/$(TYPE).nuttx-stm32f4
+COPYTARGET = $(NUTTXLIB)
+
+EXT_CFLAGS := -mlittle-endian -mthumb -mcpu=cortex-m4 -march=armv7e-m
+EXT_CFLAGS += -mfpu=fpv4-sp-d16 -mfloat-abi=hard -Wno-conversion
+
+
+.PHONY: nutx flash clean
+
+
+all:
+	mkdir -p $(INTERM)
+	mkdir -p $(OUTPUT)
+	cmake -B$(INTERM) -H./ \
+	 -DENABLE_LTO=OFF \
+	 -DENABLE_VALGRIND=OFF \
+	 -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_external.cmake \
+	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=armv7l-hf \
+	 -DEXTERNAL_CMAKE_C_COMPILER=arm-none-eabi-gcc \
+	 -DEXTERNAL_CMAKE_CXX_COMPILER=arm-none-eabi-g++ \
+	 -DEXTERNAL_BUILD_ENTRY_FILE=./targets/nuttx-stm32f4/main-nuttx.cpp \
+	 -DEXTERNAL_COMPILE_FLAGS="$(EXT_CFLAGS)" \
+	 -DEXTERNAL_LIBC_INTERFACE=$(NUTTXINC) \
+	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=arm \
+	 -DEXTERNAL_MEM_HEAP_SIZE_KB=$(JERRYHEAP)
+	make -C $(INTERM) $(TYPE).external
+	cp `cat $(INTERM)/$(TYPE).external/list` $(OUTPUT)/.
+	cp $(OUTPUT)/lib$(TYPE).jerry-core.a $(COPYTARGET)/libjerrycore.a
+	cp $(OUTPUT)/lib$(TYPE).jerry-fdlibm.third_party.lib.a \
+	 $(COPYTARGET)/libfdlibm.a
+	cp $(INTERM)/lib$(TYPE).external-entry.a $(OUTPUT)/.
+	cp $(OUTPUT)/lib$(TYPE).external-entry.a $(COPYTARGET)/libjerryentry.a
+
+
+nuttx:
+	cd $(NUTTX); make
+
+
+flash:
+	cd $(NUTTX); $(STFLASH) write nuttx.bin 0x8000000
+
+clean:
+	rm -rf $(INTERM)
+	rm -rf $(OUTPUT)

targets/nuttx-stm32f4/README.md

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+### About
+
+This folder contains files to run JerryScript on NuttX with
+[STM32F4-Discovery with BB](http://www.st.com/web/en/catalog/tools/FM116/SC959/SS1532/LN1199/PF255417)
+
+
+### How to build
+
+#### 1. Preface
+
+1, Directory structure
+
+Assume `harmony` as the root folder to the projects to build.
+The folder tree related would look like this.
+
+```
+harmony
+  + jerryscript
+  |  + targets
+  |      + nuttx-stm32f4
+  + nuttx
+  |  + nuttx
+  |      + lib
+  + st-link
+```
+
+
+2, Target board
+
+Assume [STM32F4-Discovery with BB](http://www.st.com/web/en/catalog/tools/FM116/SC959/SS1532/LN1199/PF255417)
+as the target board.
+
+
+3, Micro SD-Card memory for Script source files
+
+
+#### 2. Prepare NuttX
+
+Follow [this](https://bitbucket.org/seanshpark/nuttx/wiki/Home) page to get
+NuttX source and do the first build. When it stops with and error,
+change default project from `IoT.js` to `JerryScript` as follows;
+
+2-1) run menuconfig
+```
+# assume you are in nuttx folder where .config exist
+make menuconfig
+```
+2-2) Select `Application Configuration` --> `Interpreters`
+
+2-3) Check `[*] JerryScript interpreter` (Move cursor to the line and press `Space`)
+
+2-4) `< Exit >` once on the bottom of the sceen (Press `Right arrow` and `Enter`)
+
+2-5) Select `System Libraries and NSH Add-Ons`
+
+2-6) Un-Check `[ ] iotjs program` (Move cursor to the line and press `Space`)
+
+2-7) `< Exit >` till `menuconfig` ends. Save new configugation when asked.
+
+2-7) `make` again
+```
+make
+```
+
+It'll show the last error but it's ok. Nows the time to build JerryScript.
+
+
+#### 3. Build JerryScript for NuttX
+
+```
+# assume you are in harmony folder
+cd jerryscript
+make -f ./targets/nuttx-stm32f4/Makefile.nuttx
+```
+
+If you have NuttX at another path than described above, you can give the
+absolute path with `NUTTX` variable , for example,
+```
+NUTTX=/home/user/work/nuttx make -f ./targets/nuttx-stm32f4/Makefile.nuttx
+```
+
+Make will copy three library files to `nuttx/nuttx/lib` folder
+```
+libjerryentry.a
+libjerrycore.a
+libfdlibm.a
+```
+
+In NuttX, if you run `make clean`, above library files are also removed so you
+may have to build JerryScript again.
+
+#### 4. Continue build NuttX
+
+```
+# asssume you are in harmony folder
+cd nuttx/nuttx
+make
+```
+
+
+#### 5. Flashing
+
+Connect Mini-USB for power supply and connect Micro-USB for `NSH` console.
+
+Please refer [this](https://github.com/Samsung/iotjs/wiki/Build-for-NuttX#prepare-flashing-to-target-board)
+link to prepare `stlink` utility.
+
+
+To flash with `Makefile.nuttx`,
+```
+# assume you are in jerryscript folder
+make -f ./targets/nuttx-stm32f4/Makefile.nuttx flash
+```
+
+#### 6. Cleaning
+
+To clean the build result,
+```
+make -f ./targets/nuttx-stm32f4/Makefile.nuttx clean
+```
+
+
+### Running JerryScript
+
+Prepare a micro SD-card and prepare `hello.js` like this in the root directory of SD-card.
+
+```
+print("Hello JerryScript!");
+```
+
+Power Off(unplug both USB cables), plug the memory card to BB, and power on again.
+
+You can use `minicom` for terminal program, or any other you may like, but match
+baud rate to `115200`.
+
+```
+minicom --device=/dev/ttyACM0 --baud=115200
+```
+
+
+You may have to press `RESET` on the board and press `Enter` keys on the console
+several times to make `nsh` prompt to appear.
+
+If the prompt shows like this,
+```
+NuttShell (NSH)
+               nsh>
+                    nsh>
+                         nsh>
+```
+please set `Add Carriage Ret` option by `CTRL-A` > `Z` > `U` at the console,
+if you're using `minicom`.
+
+
+Run `jerryscript` with `hello.js`
+
+```
+NuttShell (NSH)
+nsh>
+nsh>
+nsh> jerryscript /mnt/sdcard/hello.js
+PARAM 1 : [/mnt/sdcard/hello.js]
+Hello JerryScript!
+```
+
+Please give absolute path of the script file or may get an error like this.
+```
+nsh> cd /mnt/sdcard
+nsh> jerryscript ./hello.js
+PARAM 1 : [./hello.js]
+Failed to fopen [./hello.js]
+JERRY_STANDALONE_EXIT_CODE_FAIL
+nsh>
+nsh>
+nsh> jerryscript /mnt/sdcard/hello.js
+PARAM 1 : [/mnt/sdcard/hello.js]
+Hello JerryScript!
+```