Quick, how do you wire up an SPI bus between a microcontroller and a peripheral? SCK goes to SCK, MISO goes to MISO, and MOSI goes to MOSI, right? Yeah. You’ll need to throw in a chip select pin ...
While the Raspberry Pi has very good support for an I2C bus, a lot of very cool chips – including the in system programmer for just about every ATtiny and ATmega microcontroller – use an SPI bus.
A SPI bus is a common multi-wire bus used to connect components ... If you using a Raspberry Pi, see the clock-stretching bug. The following shows a bus IO expander connected via I2C to the processor.
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