Now let’s demonstrate how to use SPI on an Arduino by building a simple example project. How to Use an Arduino to Control an MCP4131 Digital Potentiometer With SPI If a response from a slave device is expected, the master device will continue to send clock pulses until all of the response data is received at its MISO pin.įor further reading about SPI communication, check out our other article on Basics of the SPI Communication Protocol. The master needs to send enough clock pulses for the data to reach the last slave device in the chain. Similar to the other SPI network configurations, the SS/CS pins are kept LOW for the duration of data transmission. The data sent from the master then flows from one slave to the next in the chain. At the same time, it generates clock pulses at the SCLK pin. The master device then sends data over its MOSI pin to the first slave device in the chain. This will signal all of the slave devices to prepare to receive data at their MOSI pins. In the daisy chain configuration, the master device first pulls the SS/CS pin LOW to initiate communication. Sending Data in a Daisy Chain Configuration The SS/CS pin should be set to LOW to inform the slave that the master will send or request data.
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