You need to pass -fdata-sections and -ffunction-sections to the GCC compiler when compiling ALL code and --gc-sections to the linker to eliminate unused data and functions in the ELF executable. Perhaps those aren't...
One thing you might have to be careful about are pins 48-54 that are used for soldering in either 2 PSRAM chips, or 1 PSRAM chaip and 1 flash memory chip. I believe the Teensy initialization functions (called before...
It depends. A lot is compatible (first serial port, first SPI bus, first I2C bus, first 10 analog pins), some things are not.
I wrote this high level guide about compatibility some time ago:
...
It used to, but the interface was re-written some time ago (at least in Teensy land, but perhaps in the general Arduino library) to use a template. This means if you do a put or get of a structure or a base type like a...
I've used it with no problems on both the Teensy 4.0 and 4.1. With the Teensy 4.0 you can also use the memory above the program as a filesystem that can be exported with MTP. If you have the audio shield mounted, you...
It really depends on what else you are hooking up, and whether they need 5v power. For example some devices (servos, older displays, older neopixels) really, really want 5v power. For audio devices where you are...
I believe the reason is the original Audio Shields were designed for Teensy 3.1 and 3.2 (later adding the 3.5, and 3.6). These microprocessors have 2 different ground pins. The first ground pin (left of pin #0) is the...
If memory serves, the EEPROM code was changed some time ago so that it used templates for the get and put functions. Thus you can write/read the whole structure all at one go without having to convert it to bytes and...
If you were boosting the lipo battery, pololu as a series of step-up/step-down boosters that either have a fixed 3v minimum input, or you can adjust the minimum voltage with a potentiometer. I bought a few of the...
Sure, everybody has different needs, but it is always a balance. If the machine is so stripped down, then new people won't consider using it. I suspect in general, the cost of adding charging and such is fairly small....
That is assuming you want to do the necessary soldering and such. Using the feather system from Adafruit, I can just go to the drawer and pick out a random battery, and attach it to the feather without having to do any...
I have wanted batteries in so many different ways, that it would be hard to have a 1 size fits all configuration.
If you aren't aware of it, a forum member (or previous forum member) designed a charger that is made...
You might want to look at this article Paul wrote some time ago:
https://www.pjrc.com/better-spi-bus-design-in-3-steps/
I found with doing Uncanny Eyes with two displays on the same SPI bus, I needed to add...
Well a RJ45 cable comes to mind, but if you want it different than ethernet, it may not be what you want.
I would think a 2x3 2.54mm shrouded header would do what you want:
https://www.pololu.com/product/854
...
I would imagine if you clone all of the chip specific stuff in the Littlefs library, you might be able to get it to work in the SerialFlash library.
I don't have that particular chip, but I did order a Teensy 4.1...
At one time there was the Gamedunio 3X Dazzler for Teensy that could do 1280x720. However, it looks like it is sold out at excamera, adafruit, crowdsupply, and digikey (mouser may have 3, but I suspect it isn't the...
Wow, blast from the past. Note, while I bought the OctoWS2811 board some time in the past, I've never used it, and I generally only use small numbers of WS2812B leds instead of APA102.
But I have to imagine that if...
Most of the recent talk about Uncanny Eyes is in this thread:
https://forum.pjrc.com/threads/71068-Uncanny-Eyes-is-getting-expensive
In general, most of the discussion for Teensy 4.0 or 4.1 is centered on...
I am a computer programmer that has worked on compilers for over 33 years. I have been working on the GNU GCC compiler for over 20. Outside of work, I tend to be known for my steampunk camera (see http://www.steampunkmike.org for more details).
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