Sudo

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...

You might also want to look into LVGL. It is a graphics library for embedded devices and it supports a variety of displays and the ability to use your own display interface that it will then be able to draw into. People most certainly use it for...

If you do decide to use a Nextion/my library use version 2 called (Nextion2) on GitHub. I pointed you to version 1 since it was that version that was used for the UTube video example.

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

I know these are not ePaper but also look at the Nextion displays. The display has built in intelligence and acts as an HMI which then talks to the Teensy. I have written a driver for them here. I have shown a YouTube video showing part of what I...

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...

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...

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...

If your library uses the SPI or Wire library for all communication, so there's no substantial code unique to Teensy hardware and it would work on all Arduino compatible boards with SPI / Wire libs, normally you would send a pull request to...

I'd start by asking Paul Stoffregen. There are quite a number of regular contributors to the Arduino codebase and heaps of links to GitHub for similar additions along these lines in C++ and such. I'd start with Paul.

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?

If you decide to explore the FlexIO route, look for the FlexIO_t4 library. It among the many libs that get automatically installed. In Arduino IDE, click File > Examples > FlexIO_t4 > SPI > Simple to get started.

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.

Using hardware SPI is generally better to match the timing requirements, with the Teensy being so fast it's very easy to miss inserting a manual delay somewhere (for example the code you posted doesn't show the timing of CS which typically has a...

There is also a third option on Teensy 4.x and use FlexIO to implement SPI.

For any IO, you really want to keep the CPU out of the loop as much as possible so it can do other stuff (regardless of the 600Mhz clock speed). If your project is simple enough, go ahead and use bit-banging, but it still wastes CPU time. From...

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...

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...

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