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F28069M SCI通讯例程问题



导入了controlsuits里的SCI的echoback例程,在F28069的板子上,JP6跳帽是断开的,JP7是连接的。但是无法通讯,用示波器查看4号管脚也没有输出波形,其他跳帽都是连接的,BOOT的三个开关也都是在on状态,不知道为何不能输出?