Thomas Countz 🤍

🇩🇰🇺🇸🏳️‍🌈 he/him - Senior Engineer and Tech Lead on @Zendesk's Core Engineering team. Find me here:

[Thomas Countz 🤍 @ThomasCountz]

🚀 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.

[Thomas Countz 🤍 @ThomasCountz]

Low-Poly Image Generation using Evolutionary Algorithms in Ruby https://t.co/51j4IhuPsm

[Thomas Countz 🤍 @ThomasCountz]

@WokwiMakes Thanks for your amazing tool!!

[Thomas Countz 🤍 @ThomasCountz]

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.🧵

[Thomas Countz 🤍 @ThomasCountz]

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 😅

https://t.co/pJWoglPL4u

[Thomas Countz 🤍 @ThomasCountz]

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.🧵

[Thomas Countz 🤍 @ThomasCountz]

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.