图中的#else到#endif是灰色的底色,是指这一段代码没有使用吗?

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如果您用的是C6748的话,只有C674x内核,灰底这一段代码没有使用。
_TMS320C6X的定义见下面的帖子。
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/323699/c6748-starterware-_tms320c6x