error: #256: invalid redeclaration of type name "u8" (declared at line 55 of "D:\Keil_v5\ARM\ARMCC\Bin\..\include\stdint.h")

根据引用和引用，错误代码#256表示类型名称"uint32_t"在datatypes.h文件的第20行处被无效地重新声明。而类型名"u8"在错误消息中也被重新声明，但这个类型名在stdint.h文件的第55行已经声明过了。因此，错误提示显示了类型名称"u8"的无效重新声明。为了解决这个问题，你可以注释掉或直接删除"u8"的重新定义。你还可以检查一下是否还有其他地方对"u8"进行了重新声明或定义。这样应该能解决错误代码#256的问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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