However, I'm wondering if there's any other ways to control the SPI only through the SPI interface. In that way, I can debug the SPI under the condition that the iio device is unrecognizable because of some unknown reasons.
By doing some searching, I think probably using /spidev/ is a solution. But I can't find such directory after I boot the design and search in the /dev folder.
Could you provide any recommended ways to control the SPI without iio? Thanks.