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用2.2版本的sdk（ble），用sensortag的例子工程，在iar中编译正常，但功能异常，跟踪发现在i2c的初始化调用pin_open()出现异常，提示cstack指针超出范围：Sun Jan 28, 2018 19:20:51: The stack pointer for stack 'CSTACK' (currently 0x200030F0) is outside the stack range (0x20003F48 to 0x20004348)
