![]() This will mean that the usual acronyms can still be used. I will therefore be using the terms main device (or main controller) to indicate the computer that is controlling the SPI bus, and secondary device to indicate the device that the main device communicates with. The control only applies to the bus and not to the devices. In this example the Raspberry Pi will be controlling the communication bus, but by using an Arduino it's possible that it could be the Arduino telling the Raspberry Pi what to do. In addition the terminology isn't always correct. This is now considered by many to be inappropriate as it is trivialising the suffering of slaves both historically and through modern day slavery affecting vulnerable people around the world. SPI is sometimes referred to as a Master, Slave relationship. It's also a bus technology which means you can add multiple devices on the same serial ports. It uses a clock signal so that all devices can stay in sync and it's full-duplex allowing data to be transferred in both directions at the same time. ![]() Unlike the serial protocol used for USB which is asynchronous, SPI is synchronous. SPI is a serial protocol, which means that data is sent one bit at a time down a wire. In this I show an alternative way to communicate between a Raspberry Pi and an Arduino by using the SPI (Serial Peripheral Interface) protocol. In the previous page I showed how you can control an Arduino from a Raspberry Pi using USB serial communications (UART). ![]() Using Raspberry Pi and Arduino together through SPI serial communications ![]()
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