yes you can use as a double buffer.The double buffer can be thought of as two completely separate units where the interrupt routine works with one unit and the program works with another unit. For the sake of modeling, the interrupt routine will be r...
Usually, the SPI Master clocks data out while the Slave clocks data back in. So if you were sending and receiving 8 bits per transaction you can clock out 8 bits and at the same time clock in 8 bits for a total of 8 clocks. This is described in this ...
