examples: Add i2c_direct sample application

examples/i2c_direct/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_I2C_DIRECT
+	tristate "I2C direct to control sensor (like BMI270 6axis-IMU)"
+	default n
+	---help---
+		Enable the i2c_direct without SCU function
+
+if EXAMPLES_I2C_DIRECT
+
+config EXAMPLES_I2C_DIRECT_PROGNAME
+	string "Program name"
+	default "i2c_direct"
+	---help---
+		This is the name of the program that will be use when the NSH ELF
+		program is installed.
+
+config EXAMPLES_I2C_DIRECT_PRIORITY
+	int "i2c_direct task priority"
+	default 100
+
+config EXAMPLES_I2C_DIRECT_STACKSIZE
+	int "i2c_direct stack size"
+	default 2048
+
+config EXAMPLES_I2C_DIRECT_DEBUG_ON
+	bool "Enable Debug Print"
+	default n
+	---help---
+		Enable the Debug print in i2c_direct
+
+if EXAMPLES_I2C_DIRECT_DEBUG_ON
+
+config EXAMPLES_I2C_DIRECT_DPRINT_DEBUG
+	bool "Enable Debug Print (DEBUG) in i2c_direct"
+	default n
+	---help---
+		Enable the DEBUG Debug print in i2c_direct
+
+config EXAMPLES_I2C_DIRECT_DPRINT_TRACE
+	bool "Enable Debug Print (TRACE) in i2c_direct"
+	default n
+	---help---
+		Enable the TRACE Debug print in i2c_direct
+
+config EXAMPLES_I2C_DIRECT_DPRINT_INFO
+	bool "Enable Debug Print (INFO) in i2c_direct"
+	default n
+	---help---
+		Enable the INFO Debug print in i2c_direct
+
+config EXAMPLES_I2C_DIRECT_DPRINT_WARN
+	bool "Enable Debug Print (WARN) in i2c_direct"
+	default n
+	---help---
+		Enable the WARN Debug print in i2c_direct
+
+config EXAMPLES_I2C_DIRECT_DPRINT_ERROR
+	bool "Enable Debug Print (ERROR) in i2c_direct"
+	default n
+	---help---
+		Enable the ERROR Debug print in i2c_direct
+endif
+
+endif

examples/i2c_direct/Make.defs

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+############################################################################
+# i2c_direct/Make.defs
+############################################################################
+ifneq ($(CONFIG_EXAMPLES_I2C_DIRECT),)
+CONFIGURED_APPS += i2c_direct
+endif

examples/i2c_direct/Makefile

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+############################################################################
+# i2c_direct/Makefile
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# i2c_direct built-in application info
+PROGNAME  = $(CONFIG_EXAMPLES_I2C_DIRECT_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_I2C_DIRECT_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_I2C_DIRECT_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_I2C_DIRECT)
+
+# I2C direct Example
+ASRCS =
+CSRCS = i2c_common.c i2c_bmi270.c bmi270.c
+MAINSRC = i2c_direct_main.c
+
+CFLAGS += -I ./include
+CXXFLAGS += -I ./include
+
+include $(APPDIR)/Application.mk

examples/i2c_direct/README.txt

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+examplex/i2c_direct
+^^^^^^^^^^^^^^^^^^^
+
+  Example for using i2c_direct with BMI270 
+
+  Sample application to control I2C-connected sensors
+  by directly manipulating /dev/i2cx.
+  This sample controls a BMI270 Bosch 6-axis IMU, taking
+  512 measurements and displaying acceleration and angular
+  rate of rotation. It also displays the tilt using LEDs
+  on the SPRESENSE Main Board.
+
+  The following configuration options can be selected:
+
+  CONFIG_EXAMPLES_I2C_DIRECT -- i2c_direct example. 
+       Default: n
+  CONFIG_EXAMPLES_I2C_DIRECT_PROGNAME -- You can choice other name for
+    this program if change this field. Default: "i2c_direct"
+  CONFIG_EXAMPLES_I2C_DIRECT_PRIORITY -- Specified this example's task priority.
+	  Default: 100
+  CONFIG_EXAMPLES_I2C_DIRECT_STACKSIZE -- Specified this example's stack size.
+	  Default: 2048
+  CONFIG_EXAMPLES_I2C_DIRECT_DEBUG_ON -- Toggle with or without debug display.
+    Default: n
+  CONFIG_EXAMPLES_I2C_DIRECT_DPRINT_DEBUG -- Toggle with or without DEBUG display.
+    Default: n
+  CONFIG_EXAMPLES_I2C_DIRECT_DPRINT_TRACE -- Toggle with or without TRACE display.
+    Default: n
+  CONFIG_EXAMPLES_I2C_DIRECT_DPRINT_INFO -- Toggle with or without INFO display.
+    Default: n
+  CONFIG_EXAMPLES_I2C_DIRECT_DPRINT_WARN -- Toggle with or without WARN display.
+    Default: n
+  CONFIG_EXAMPLES_I2C_DIRECT_DPRINT_ERROR -- Toggle with or without ERROR display.
+    Default: n
+
+  Build kernel and SDK:
+
+  This application can be used by i2c_direct default config.
+
+  $ ./tools/config.py examples/i2c_direct
+  $ make
+
+  Execute under nsh:
+
+  Type 'i2c_direct' on nsh like this.
+  nsh> i2c_direct