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Maybe this is a noob suggestion, but if you are not using batteries and are ultimately drawing power from the mains, how about putting your setup behind a UPS (uninterruptible power supply) or at least a surge protector for the next test? Maybe your utility is giving you voltage spikes. Over...

Cool, I will take a look to get some inspiration.

I am planning to work on 3 applications in the following order: Teensy and big ePaper display (non-interactive self-updating dashboard). Teensy and small ePaper display with moderately interactive capabilities. Teensy and led touch screen with full interactive capabilities. Only 2D graphics...

I am looking for recommendations for 2D graphics libraries. I can think of 2 different needs: The case for drawing static dashboard-like images where one would need at least some geometric shapes and text rendering. Charts and other goodies would be a plus. The case for interactive UIs with...

Yes, that makes a lot of sense. Actually it uses minimal Teensy-specific code, like for example putting the framebuffer in DMAMEM and using Teensy <SPI.h> functions like beginTransaction and SPISettings. But as you mentioned, this is not a substantial difference and does not justify a separate...

I noticed Teensyduino does not come with Waveshare ePaper libraries. Does Teensyduino welcome contributions? If I wanted to contribute some ePaper libraries when they are finished, how should that be done?

Thanks to all for the insightful answers. I will dig deeper into all the information you have provided me. Might do a followup on the results in a few days.

I want to port some Waveshare ePaper libraries to Teensy 4. Waveshare has example drivers for ESP32 and Arduino. I see they bit-bang the SPI communication instead of using the SPI library. But their implementation looks strange to me, as they use some delays that the protocol apparently does not...

Forgive me if this is an obvious question, but given the speed of a Teensy 4, I wonder if there is a significant performance difference between using hardware SPI vs big-banged SPI. I get that in an 8-bit AVR microcontroller using hardware accelerated SPI could make a huge difference, but in a...

Just in case, I sent you a PM regarding the Teensies too :) Hope you still have some available.