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关于C6748 SPI通信问题

使用C6748作为主处理器,通过AD5724来实现DA转换,但目前在采用率为10k下能正常输出模拟信号,当采样率提高时,采用SPI传输的DA模块输出为0,因此想要提高SPI的频率,但查找TI的库函数,并未找到SPI的频率设置处,请问SPI频率可以改吗?