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No source available for "0x4" 是因为什么原因造成的?



我程序里有一个引脚控制led灯在定时闪烁。通过上位机软件会设置一些变量,然后下位机接收到数据后进行保存。这个时候灯就会不再闪烁,而且会报错No source available for "0x4" 。