Fix example-fsm-55 and documentation.

doc/chopstx.texi

@@ -11,7 +11,7 @@
 This manual is for Chopstx (version @value{VERSION}).
 
 @noindent
-Copyright @copyright{} 2013, 2015, 2016 Flying Stone Technology @*
+Copyright @copyright{} 2013, 2015, 2016, 2017 Flying Stone Technology @*
 
 @quotation
 Permission is granted to copy, distribute and/or modify this document
@@ -59,6 +59,7 @@ section entitled ``Copying''.
 
 @menu
 * Introduction::                 What is Chopstx.
+* Use of sleep mode::            Use it carefully.
 * API::                          API.
 
 Appendix
@@ -83,9 +84,9 @@ Indexes
 @node Introduction
 @chapter Introduction
 
-Chopstx is an RT thread library for ARM Cortex-M0, Cortex-M0plus and
-Cortex-M3.  Specifically, it is used for STM32F030, MKL27Z and
-STM32F103.
+Chopstx is an RT thread library for ARM Cortex-M0, Cortex-M0plus,
+Cortex-M3 and GNU/Linux emulation.  Specifically, it is used for
+STM32F030, MKL27Z and STM32F103.
 
 While most RTOSes come with many features, drivers, and stacks,
 Chopstx just offers a RT thread library.
@@ -93,6 +94,16 @@ Chopstx just offers a RT thread library.
 With Chopstx, interrupt handling is also done by a thread.  This
 enables coherent code for ease of maintenance.
 
+@node Use of sleep mode
+Calling the chopstx_conf_idle function with 1 to allow the idle thread
+going to sleep.  MCU will be in sleep mode when no threads are
+running.  By setting relevant system registers, MCU will be able to be
+into deep sleep or stand-by mode.
+
+If you use this sleep feature, please consider and implement
+carefully.  Enabling sleep, it may result bricked board; A board with
+no RESET pin cannot be debugged by JTAG/SWD.
+
 
 @node API
 @chapter API