Serial Peripheral Interface (SPI)

Serial Peripheral Interface (SPI) is commonly used for connecting to peripheral devices. A commonly used alternative is Inter-Integrated Circuit (I2C).

Conventions

• CS is Chip Select
  • On Raspberry Pi, this is CE0 or CE1
  • This is a digital signal that tells the slave device to listen to the master
• DC is Data/Command
  • This is a digital signal that tells the slave device whether the data on the MOSI line is a command or data
• SDA is data line
  • Also called MOSI (Master Out Slave In) or DIN (Data In)
  • This is the line that the master sends data to the slave
• SCL is clock line
  • Also called CLK or SCLK (Serial Clock)
  • This is the line that the master uses to send clock pulses to the slave
• RST is reset
  • This is a digital signal that resets the slave device