需要注意的是,HSPI和VSPI并不是网友们认为的high-speed SPI 和Very High-speed SPI,这是SPI和HSPI、VSPI是一样的,只不过是换个名字用于区分,SPI相当于SPI0或SPI1,HSPI相当于SPI2,VSPI相当于SPI3。
* When work in full-duplex mode at frequency > 26.7MHz, device cannot read correct data. * Try to use IOMUX pins to increase the frequency limit, or use the half duplex mode. * Please note the SPI master can only work at divisors of 80MHz, and the driver always tries to find the closest frequency to your configuration. * Specify ``SPI_DEVICE_NO_DUMMY`` to ignore this checking. Then you can output data at higher speed, or read data at your own risk.
如果需要IOMUX提高SPI速率,则可以做一下配置
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