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TMS320F28379D: sci_boot启动

Part Number: TMS320F28379D
Other Parts Discussed in Thread: UNIFLASH, C2000WARE

我在上电前把GPIO84通过拨码开关上拉为1,其他两个下拉为0后接上电源,通过串口助手发送0x41给dsp,但是dsp没有任何回复,这是怎么回事?