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关于SCI接收问题

Other Parts Discussed in Thread: TMS320F2808

TMS320F2808芯片,SCI输入输出配置好后,采用中断触发,不是FIFO模式,自发自收可以;但是用串口调试助手实验时,调试助手只能接收到DSP的数据,发送数据给DSP,触发不了接收中断。请教下可能是什么问题?