Going from Arduino TWI to BeagleBone Black Bonescript #BeagleBoneBlack @TXInstruments @BeagleBoardOrg


NewImage

How to go from Arduino TWI to Beaglebone Black Bonescript. by Monkeyiq

Going from Arduino TWI to BeagleBone Black Bonescript

It’s handy for a robot to know what orientation it is holding, and for that a Magnetometer can give you where north is at relative to the chip orientation. For this I used the HMC5883. I started out with a cut down minimal version of code running on Arduino and then started porting that over to Bonescript for the BeagleBone Black to execute.

The HMC5883 only needs power (3v3), ground, and the two wires of a TWI.

One of the larger API changes of the port is the Arduino line:

Wire.requestFrom( HMC5883_ADDRESS_MAG, 6 );

Which takes the TWI address of the chip you want 6 bytes from. It has to be prefixed by another TWI transmission to set the read byte address to start from where you would like, in this case HMC5883_REGISTER_MAG_OUT_X_H_M = 0x03.

On the Bonescript side this becomes the following. The TWI address isn’t used because the wire object already knows that, but you pass the register address to start reading from directly to the request to read bytes:

self.wire.readBytes( HMC5883_REGISTER_MAG_OUT_X_H_M,
BUFFER_SIZE,
function(err, res) { … });

I pushed the code up to github bbbMagnetometerHMC5883. Note that getting “north” requires both a proper declination angle for your location and also some modification to allow for how your magneto chip is physically oriented on your robot. Actual use of the chip is really easy with the async style of nodejs.

Read more


BeagleBone Adafruit Industries Unique fun DIY electronics and kitsEach Tuesday is BeagleBone Black Day here Adafruit! What is the BeagleBone? The BeagleBones are a line of affordable single-board Linux computers (SBCs) created by Texas Instruments. New to the Bone? Grab one of our Adafruit BeagleBone Black Starter Packs and check out our extensive resources available on the Adafruit Learning System including a guide to setting up the Adafruit BeagleBone IO Python Library. We have a number of Bone accessories including add-on shields (called “capes”) and USB devices to help you do even more with your SBC. Need a nice display to go along with your Bone? Check out our fine selection of HDMI displays, we’ve tested all of them with the Beagle Bone Black!


As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email circuitpython2022@adafruit.com to let us know about your post so we can blog it up here.

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 32,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — Pololu’s account of the chip shortage

Wearables — Make it sticky

Electronics — Your job’s a joke, you’re broke, your semiconductor is DOA

Python for Microcontrollers — Python on Microcontrollers Newsletter: Raspberry Pi Pico turns one and more! #Python #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — 2021 in Recap!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — NEW PRODUCT – ESP32­-S3­-DevKitC-1 – ESP32-S3-WROOM-2 – 32MB Flash 8MB PSRAM

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.