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TMS320C6748: SPI

Part Number: TMS320C6748

我学习C6748不久,我想要将C6748作为从机通过SPI接收数据,关于数据接收的程序,我想通过中断接收,具体内容如下:

报错如下:

看起来HWREG不能直接在主程序中调用,我想知道我应该怎么解决这个问题?或者有什么别的思路来接受数据么?