Why SPI is used for fast peripherals in Raspberry Pi - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize SPI communication on Raspberry Pi.

Raspberry Pi

import spidev
spi = spidev.SpiDev()
spi.open(0, [1])

Drag options to blanks, or click blank then click option'

A3

B1

C2

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using device number instead of bus number

Confusing bus and device numbers

The SPI device on Raspberry Pi is usually opened with bus 0 and device 0.

2fill in blank

medium

Complete the code to set SPI speed to 1 MHz.

Raspberry Pi

spi.max_speed_hz = [1]

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A100000

B5000000

C1000000

D10000

Attempts:

3 left

💡 Hint

Common Mistakes

Using 100000 instead of 1000000

Confusing kHz and MHz

Setting max_speed_hz to 1000000 sets SPI speed to 1 MHz, suitable for fast peripherals.

3fill in blank

hard

Fix the error in the code to send data over SPI.

Raspberry Pi

data = [0x01, 0x02, 0x03]
response = spi.[1](data)

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Axfer

Bread

Cwrite

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using write which only sends data

Using read which only reads data

The xfer method sends data and receives response simultaneously in SPI communication.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps pin numbers to their SPI modes.

Raspberry Pi

spi_modes = {pin: [1] for pin in range(1, 5) if pin [2] 3}

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A0

B>

C<

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operator

Assigning wrong SPI mode

This comprehension assigns SPI mode 0 to pins less than 3.

5fill in blank

hard

Fill all three blanks to filter and map SPI devices with speed over 500 kHz.

Raspberry Pi

fast_devices = [1]: [2] for [3] in devices if devices[[3]] > 500000}

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Adevice

Bspeed

Cdev

Ddevices

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names

Incorrect dictionary comprehension syntax

This comprehension creates a dictionary of devices with speed over 500 kHz, mapping device names to their speeds.