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根据task中需要保存局部变量和函数调用的多少来决定，具体请看下面的dsp/bios user guide文档。
Stack size can be specified separately for each TSK object. Each stack must be large enough to handle normal subroutine calls as well as a single task preemption context. http://www.ti.com/lit/ug/spru423i/spru423i.pdf
