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failed to locate symbol '' in symbol table

我现在在用matlab调试2812开发板,已经通过matlab将工程文件添加到CCS IDE中并且build、load到目标板,也执行了。主源文件中有一个数组xn[],现在我想通过matlab读取dsp中的变量值,所以在matlab中执行语句:address(cc, 'xn')时,返回值为空,提示下列错误:

Warning: Address: Failed to locate symbol 'xn' in symbol table

> In F:\MATLABR2009a\toolbox\shared\idelinks\+linkfoundation\+autointerface\@baselink\address.p>address at 52

ans =

    []

不知道是什么原因? 哪位童鞋能帮忙解答一下,在网上没找到相关的答案....

谢谢