Serial peripheral interface (SPI) is a common communication protocol used by many microcontrollers, sensors, and driver hardware to pass data back and forth. It relies on 4 pins for communication:
- Clock (SCK)
- Data out from controller (MOSI, COPI, etc.)
- Data in from controller (MISO, CIPO, etc.)
- Chip select (CS)
In this video, we show you how to use SPI from the Raspberry Pi Pico to communicate with an ADXL343 accelerometer. We give an example in MicroPython as well as C/C++.
A written form of this tutorial along with the code can be found here: https://www.digikey.com/en/maker/projects/raspberry-pi-pico-rp2040-spi-example-with-micropython-and-cc/9706ea0cf3784ee98e35ff49188ee045
More information about SPI can be found in this article: https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html
We recommend following this guide to set up the toolchain and VS Code if you are working with the Raspberry Pi Pico C/C++ SDK: https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-1-blink-and-vs-code/7102fb8bca95452e9df6150f39ae8422
SPI can be used for relatively high data rates, easily reaching speeds over 5 Mbps. However, it requires extra lines over other protocols (e.g. I2C). Additionally, a chip select (CS) pin needs to be dedicated to each peripheral, unless the peripherals support daisy-chain operation (as is common with some LED drivers). Because of this high data rate and extra required pins, you will often see SPI used for sensors that report lots of data or driver boards where high data rate is needed. For low data rate sensors, I2C is often the preferred protocol.
Product Links:
https://www.digikey.com/en/products/detail/raspberry-pi/SC0915/13624793
https://www.digikey.com/en/products/detail/adafruit-industries-llc/4097/9951931
Related Videos:
Intro to Raspberry Pi Pico and RP2040 - MicroPython Part 1: Blink - https://www.youtube.com/watch?v=JCk9QaCH5QU
Intro to Raspberry Pi Pico and RP2040 - C/C++ Part 1: VS Code and Blink - https://www.youtube.com/watch?v=B5rQSoOmR5w
Intro to Raspberry Pi Pico and RP2040 - C/C++ Part 2: Debug with Picoprobe - https://www.youtube.com/watch?v=jnC5LrTx470
Related Project Links:
https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-micropython-part-1-blink/58b3c31ac93649849b58824caa00529c
https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-1-blink-and-vs-code/7102fb8bca95452e9df6150f39ae8422
https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-2-debugging-with-vs-code/470abc7efb07432b82c95f6f67f184c0
Learn more:
Maker.io - https://www.digikey.com/en/maker
Digi-Key’s Blog – TheCircuit https://www.digikey.com/en/blog
Connect with Digi-Key on Facebook https://www.facebook.com/digikey.elec...
And follow us on Twitter https://twitter.com/digikey
- Clock (SCK)
- Data out from controller (MOSI, COPI, etc.)
- Data in from controller (MISO, CIPO, etc.)
- Chip select (CS)
In this video, we show you how to use SPI from the Raspberry Pi Pico to communicate with an ADXL343 accelerometer. We give an example in MicroPython as well as C/C++.
A written form of this tutorial along with the code can be found here: https://www.digikey.com/en/maker/projects/raspberry-pi-pico-rp2040-spi-example-with-micropython-and-cc/9706ea0cf3784ee98e35ff49188ee045
More information about SPI can be found in this article: https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html
We recommend following this guide to set up the toolchain and VS Code if you are working with the Raspberry Pi Pico C/C++ SDK: https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-1-blink-and-vs-code/7102fb8bca95452e9df6150f39ae8422
SPI can be used for relatively high data rates, easily reaching speeds over 5 Mbps. However, it requires extra lines over other protocols (e.g. I2C). Additionally, a chip select (CS) pin needs to be dedicated to each peripheral, unless the peripherals support daisy-chain operation (as is common with some LED drivers). Because of this high data rate and extra required pins, you will often see SPI used for sensors that report lots of data or driver boards where high data rate is needed. For low data rate sensors, I2C is often the preferred protocol.
Product Links:
https://www.digikey.com/en/products/detail/raspberry-pi/SC0915/13624793
https://www.digikey.com/en/products/detail/adafruit-industries-llc/4097/9951931
Related Videos:
Intro to Raspberry Pi Pico and RP2040 - MicroPython Part 1: Blink - https://www.youtube.com/watch?v=JCk9QaCH5QU
Intro to Raspberry Pi Pico and RP2040 - C/C++ Part 1: VS Code and Blink - https://www.youtube.com/watch?v=B5rQSoOmR5w
Intro to Raspberry Pi Pico and RP2040 - C/C++ Part 2: Debug with Picoprobe - https://www.youtube.com/watch?v=jnC5LrTx470
Related Project Links:
https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-micropython-part-1-blink/58b3c31ac93649849b58824caa00529c
https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-1-blink-and-vs-code/7102fb8bca95452e9df6150f39ae8422
https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-2-debugging-with-vs-code/470abc7efb07432b82c95f6f67f184c0
Learn more:
Maker.io - https://www.digikey.com/en/maker
Digi-Key’s Blog – TheCircuit https://www.digikey.com/en/blog
Connect with Digi-Key on Facebook https://www.facebook.com/digikey.elec...
And follow us on Twitter https://twitter.com/digikey
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