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28027f中的datalog显示图像问题

#pragma DATA_SECTION(datalogBuff1,"graph_data");
#pragma DATA_SECTION(datalogBuff2,"graph_data");
#pragma DATA_SECTION(datalogBuff3,"graph_data");

不加这段代码就说内存不够,加上就警告creating output section "graph_data" without a SECTIONS。也显示不出图像,但是数据是有的。

想知道是什么原因,以及这段代码的意义,谢谢!