zephyr: Initial Zephyr RTOS port, Zephyr part.

zephyr/Kbuild

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+#subdir-ccflags-y += -I$(SOURCE_DIR)/../mylib/include
+
+obj-y += src/

zephyr/Makefile.zephyr

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+#
+# Copyright (c) 2016 Intel Corporation
+#
+# 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.
+#
+
+KERNEL_TYPE = nano
+# BOARD must be passed on command line from main Makefile
+#BOARD =
+CONF_FILE = prj.conf
+
+#export SOURCE_DIR = $(ZEPHYR_BASE)/samples/static_lib/hello_world
+export LDFLAGS_zephyr += -L$(CURDIR)
+export ALL_LIBS += micropython
+
+include ${ZEPHYR_BASE}/Makefile.inc

zephyr/prj.conf

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+CONFIG_STDOUT_CONSOLE=y
+CONFIG_CONSOLE_HANDLER=y
+CONFIG_NEWLIB_LIBC=y
+CONFIG_FLOAT=y

zephyr/src/Makefile

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+#
+# Copyright (c) 2016 Intel Corporation
+#
+# 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.
+#
+
+obj-y += zephyr_start.o zephyr_getchar.o

zephyr/src/zephyr_start.c

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+#include <zephyr.h>
+#include "zephyr_getchar.h"
+
+int real_main(void);
+
+void main(void) {
+    zephyr_getchar_init();
+    real_main();
+}