Is the line for the master to select which slave to send data to?
MOSI (Master Output/Slave Input) – Line for the master to send data to the slave.
What is slave select in SPI?
Chip select (CS) or slave select (SS) is the name of a control line in the SPI bus used to select one (or a set) of the slave device (commonly called “chips”) out of several slave devices connected to the same master device.
How do I select a slave in SPI?
To begin SPI communication, the master must send the clock signal and select the slave by enabling the CS signal. Usually chip select is an active low signal; hence, the master must send a logic 0 on this signal to select the slave.
How does SPI communicate between master and slave?
SPI is a full-duplex interface; both master and slave can send data at the same time via the MOSI and MISO lines respectively. During SPI communication, the data is simultaneously transmitted (shifted out serially onto the MOSI/SDO bus) and received (the data on the bus (MISO/SDI) is sampled or read in).
What does SPI data transfer in either direction mean?
SPI data transfer in either direction means the master sends a clock and whoever wants to say something (including the master itself) puts it onto the data line with the clock cycles. In principle, the master could just generate the clock without sending data out, but this is the same as sending a 0x00.
How does the master and Slave interface work?
SPI is a synchronous, full duplex master-slave-based interface. The data from the master or the slave is synchronized on the rising or falling clock edge. Both master and slave can transmit data at the same time.
How does a multislave SPI daisy chain work?
Multislave SPI daisy-chain configuration. In daisy-chain mode, the slaves are configured such that the chip select signal for all slaves is tied together and data propagates from one slave to the next. In this configuration, all slaves receive the same SPI clock at the same time.