Merge pull request #490 from shino-ixy/rs422_example

examples : add RS-422 sample

examples/rs422/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_RS422
+	tristate "RS422 master/slave example"
+	default n
+	---help---
+		Enable the RS422 master/slave communication sample
+
+if EXAMPLES_RS422
+
+choice
+	prompt "Read Enable Pin Assign"
+	default EXAMPLES_RS422_RE_PIN_I2S_DIN
+
+	config EXAMPLES_RS422_RE_PIN_EMMC_DATA3
+		bool "EMMC_DATA3"
+
+	config EXAMPLES_RS422_RE_PIN_I2S_DIN
+		bool "I2S_DIN"
+endchoice
+
+choice
+	prompt "Data Enable Pin Assign"
+	default EXAMPLES_RS422_DE_PIN_I2S_DOUT
+
+	config EXAMPLES_RS422_DE_PIN_EMMC_DATA2
+		bool "EMMC_DATA3"
+
+	config EXAMPLES_RS422_DE_PIN_I2S_DOUT
+		bool "I2S_DOUT"
+endchoice
+
+config EXAMPLES_RS422_PROGNAME
+	string "Program name"
+	default "rs422"
+	---help---
+		This is the name of the program that will be use when the NSH ELF
+		program is installed.
+
+config EXAMPLES_RS422_PRIORITY
+	int "rs422 task priority"
+	default 100
+
+config EXAMPLES_RS422_STACKSIZE
+	int "rs422 stack size"
+	default 2048
+
+endif

examples/rs422/Make.defs

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+############################################################################
+# rs422/Make.defs
+############################################################################
+ifneq ($(CONFIG_EXAMPLES_RS422),)
+CONFIGURED_APPS += rs422
+endif

examples/rs422/Makefile

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+############################################################################
+# rs422/Makefile
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# RS422 built-in application info
+PROGNAME  = $(CONFIG_EXAMPLES_RS422_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_RS422_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_RS422_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_RS422)
+
+# RS422 Example
+ASRCS =
+CSRCS = 
+MAINSRC = rs422_main.c
+
+include $(APPDIR)/Application.mk

examples/rs422/README.txt

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+examplex/rs422
+^^^^^^^^^^^^^^
+
+  Example for communicate nodes via RS422. 
+
+  Sample application to link two SPRESENSEs using RS422. 
+  There is a loopback mode to verify operation with one
+  SPRESENSE and a master/slave mode to link two SPRESENSEs.
+  Communication results are displayed in stdout.
+
+  The following configuration options can be selected:
+
+  CONFIG_EXAMPLES_RS422 -- rs422 example. 
+       Default: n
+  CONFIG_EXAMPLES_RS422_RE_PIN_EMMC_DATA3 
+  or CONFIG_EXAMPLES_RS422_RE_PIN_I2S_DIN
+    -- Read Enable Pin Assign
+      Default: "CONFIG_EXAMPLES_RS422_RE_PIN_I2S_DIN"
+  CONFIG_EXAMPLES_RS422_RE_PIN_EMMC_DATA3 
+  or CONFIG_EXAMPLES_RS422_RE_PIN_I2S_DIN
+    -- Data Enable Pin Assign
+      Default: "CONFIG_EXAMPLES_RS422_DE_PIN_I2S_DOUT"
+  CONFIG_EXAMPLES_RS422_PROGNAME -- this program if change this field.
+      Default: "rs422"
+  CONFIG_EXAMPLES_RS422_PRIORITY -- Specified this example's task priority.
+	  Default: 100
+  CONFIG_EXAMPLES_RS422_STACKSIZE -- Specified this example's stack size.
+	  Default: 2048
+
+  Build kernel and SDK:
+
+  This application can be used by rs422 default config.
+
+  $ ./tools/config.py examples/rs422
+  $ make
+
+  Execute under nsh:
+
+  Type 'rs422' and option on nsh like this.
+
+  If you want to run in loopback mode,
+  nsh> rs422 -l
+
+  If you want to run in master/slave mode,
+  First execute the following in the slave mode side of the presense
+  nsh> rs422 -s
+
+  Next, on the master mode side, in the spresense, do the following
+  nsh> rs422 -m
+