SPI with display modules in Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does SPI stand for and what is its main purpose in Raspberry Pi display modules?

SPI stands for Serial Peripheral Interface. It is a way for the Raspberry Pi to talk quickly with display modules by sending data one bit at a time over a few wires.

beginner

Name the four main wires used in SPI communication with display modules.

The four main wires are: MOSI (Master Out Slave In), MISO (Master In Slave Out), SCLK (Serial Clock), and CS (Chip Select). For displays, MISO is often not used.

intermediate

Why do SPI display modules often require a 'Data/Command' pin?

The Data/Command pin tells the display if the information sent is a command (like 'clear screen') or actual data (like pixels to show). This helps the display understand what to do.

beginner

What Python library is commonly used on Raspberry Pi to control SPI displays?

The 'spidev' library is commonly used to control SPI devices, including display modules, on Raspberry Pi.

beginner

How do you enable SPI on a Raspberry Pi before using SPI display modules?

You enable SPI by running 'sudo raspi-config', navigating to 'Interface Options', then enabling SPI. After reboot, SPI pins become active for use.

Which SPI wire sends data from Raspberry Pi to the display?

A MOSI

B MISO

C SCLK

D CS

MOSI stands for Master Out Slave In, so it sends data from the Raspberry Pi (master) to the display (slave).

What is the role of the Chip Select (CS) pin in SPI communication?

A It provides power to the display

B It resets the display

C It selects which device to communicate with

D It sends clock signals

The CS pin tells the display when the Raspberry Pi wants to talk to it, enabling communication only with the selected device.

Which Python library is typically used to communicate with SPI devices on Raspberry Pi?

A pygame

B spidev

C tkinter

D numpy

The spidev library provides an easy way to send and receive data over SPI on Raspberry Pi.

Why might the MISO wire be unused in SPI display modules?

A MISO is used for clock signals

B MISO is only for power supply

C MISO is replaced by CS pin

D Displays only receive data, they don't send data back

Most SPI displays only receive data from the Raspberry Pi and do not send data back, so MISO is often not connected.

What must you do before using SPI on Raspberry Pi?

A Enable SPI interface in Raspberry Pi settings

B Install a special display driver

C Connect the display to USB port

D Update the Raspberry Pi OS

SPI must be enabled in the Raspberry Pi configuration settings before it can be used.

Explain how SPI communication works between Raspberry Pi and a display module.

Think about how the Pi sends commands and data step by step.

Describe the steps to set up and use an SPI display module on Raspberry Pi using Python.

Start from turning on SPI to showing something on the screen.