when "PLATFORM  == armcc", the option "CFLAGS += '  -g -O0' " needs to change to "CFLAGS += ' --c99 -g -O0'" to support the keyword "inline"

详细内容请参见《see mips run》中的5.3节——异常向量：异常处理开始的地方

浮点经常会用到，所以默认使用硬浮点。

 Fix some exception handling，such as when rt_sem_take failed in tx，transmission cannot be resumed。

code style clean