HI @Tim Edwards @Matt Venn Is the master spi full duplex? i wrote the following code but I am not able to read the sdi data which i am receiving in the chip. Transmitted is 0xd2 from slave but i read 69 inside caravel master firmware. mosi data which is 0xab is received at the slave side. 2) can house keeping spi and master spi run in parallel or they run sequential?