I am using the USB SD board and I want to use it with SPI.
The “V” command (Get Version Number) and “J” command (Read Status Register) work fine, but I cannot initialize and mount the SD card with the “I” command.
I found that the RFB ALFAT response is not right with the “I” command. I miss two RFB (blue signal)! Decreasing the bus frequency and tracking the SPI_BUSY state was not successful.
Thank you very much!