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control suite中,2837xS的sci_echoback例程无法进入接收中断的问题



遇到的问题如题目所示

硬件电路设计中,需要通过DSP引脚切换串口的输入输出功能:

因此我仅将代码做出如下改动:

然后在运行过程当中,程序就卡在了光标所在的位置

请问是哪里出了问题呢