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spi实现同时读写



 dsp5535那个板子,csl库里的读写函数好像并不是双工的,但我接的外设的时序图说,发完命令后的一个byte就已经是数据了,那如果我先调用write函数发命令,再用read函数读命令,会不会有可能读不到想要的数据?
请问怎么实现读写同时进行?