我在用serialbootloader的PC工具SBDemo.exe时遇到问题,提示未收到回复的错误(见附图),不知道是什么原因呢?我用的DB9的2、3、5,分别接的板子的P0_2、P0_3、GND(P0_2、P0_3对调也试过),串口线测试时好的呀,是什么原因呢?
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