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为什么在判断中断源，读取GIF寄存器时，进行16位的读取，会出现负值的情况？
请把数据类型改成无符号数试试。
CAN要求控制和状态寄存器需要32位读写。
控制和状态寄存器(Control and Status Registers)的定义在spru074的20页Figure 1−4. eCAN−A Memory Map中有罗列。
