format. It is targeted at 32 bit microcontrollers, but is also fit for
other embedded systems with tight (2-10 kB ROM, <1 kB RAM) memory
constraints.(http://koti.kapsi.fi/jpa/nanopb/)

How to use the example:
	1. move examples/nanopb to bsp/xxxx/
	2. enable macro RT_USING_NANOPB in rtconfig.h
	3. regenerate the project file (scons --target=xxxx)
	4. rebuild the project

Fix some "unused variable" and "used before set" warnings.

Some component that depend on TC would like to include the tc_comm.h.

We should not use the _tc_stat to determine whether we should loop the
TCs. Use an other variable and introduce tc_loop FinSh command.

With system that has RT_TICK_PER_SECOND is 1000, it's easy to get one
tick error.

No functional changes.

The tc thread should delay more time than tid2 in order to let it run
the test. The hard-coded "27" is not enough in some cases.

TCs are supposed to exit with the TC_STAT_RUNNING cleared. If it forgot
to do this, do it by ourselves.

The sem that has been created should be deleted. The sem that has been
inited should be detached.

There can be a race condition that the sem has alread been detached
after we did the cleanup. Besides, there is a RT_IPC_CMD_RESET command
in rt_sem_control which is more clear in setting the sem values.

After `log_trace_init()`, call `memlog_init`. It then turn the logtrace
into a "in-memory" logger which will buffer all the log in memory. It
also set a hook in idle to flush all the log into console. One may
create an other thread to flush the logs but idle might be the simplest
place to go.

Real-YModem implemented a flexible YModem support. It use callback-based
structure to let the user application to deal with the data. It contains
3 examples:

    1. echo.c: write the data recieved on YModem to an other device
    2. null.c: discard the YModem data
    3. tofile.c: write the data to the file system

Currently, it does not support batch file transmission.

error: expected expression before 'void'
error: too many arguments to function

As part of RTGUI, we should also remove gui examples. Copy
demo/examples/* in RT-Thread/RTGUI to examples/gui in RTT When you need
them.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2550 bbd45198-f89e-11dd-88c7-29a3b14d5316