28335串口更新只能是串口A吗?
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不一定,根据你的描述只能判断程序没有正常跑起来,可能是没代码也可能是boot方式不对;建议检查下cmd文件确定.txt段定义到Flash中;还有检查下仿真器拔了没有,或检查boot方式是否是跳到Flash中的。