🇩🇰🇺🇸🏳️🌈 he/him - Senior Engineer and Tech Lead on @Zendesk's Core Engineering team. Find me here: https://xitter.cf/t.co/YtI0GCRv8o
Copenhagen, Denmark
Joined March 2008
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🚀 Let's explore Closures in #Ruby with a space-themed example! 🌌 #ThomasTip
Closures are functions/methods that can be invoked from other functions or methods, while retaining access to variables from their original scope.
Low-Poly Image Generation using Evolutionary Algorithms in Ruby thomascountz.com/2023/07/30/…
What we're looking at here is the first initialization instructions being sent from MicroPython (uPy) running on Raspberry Pi Pico (RPi Pico) through a PCF8574 8-bit I/O expander via I2C, to an HD44780 controlling a "1602" Dot Matrix LCD.🧵
So what is PB4 doing with data length?
Setting it to 1, as we've done, tells the HD44780 that we're sending and receiving data in 8-bit lengths. Confusingly, we're sending in 4-bit lengths, but during initialization, we must use 8-bit mode and allow PB0-PB3 to be considered 0.
I reached the Twitter thread limit with this rabbit hole. It wasn't going anywhere in particular, so I appreciate you coming for the ride.
If you've ever written drivers, I'd love to hear about your experience! I have no idea what I'm doing 😅
xitter.cf/ThomasCountz/status/17…
