PaulStoffregen
Senior Member

I don't know. I haven't tested these ancient LCDs in quite some time. I wrote LiquidCrystalFast over 10 years ago, when we only had slow 8 bit boards. It was designed to get the best performance on that hardware. ...

Kurt is right. The Teensy 4.x hardware simply does not support enough endpoints to add a 4th CDC serial. But it could be done on Teensy 3.x. Each CDC serial needs 2 endpoints (1 bidirectional data, 1 unidirectional...

First a word of caution. These displays usually run with 5V power. Of the 32 bit Teensy models, only 3.2 and 3.5 are 5V tolerant. The 6 signal mode is safe, because all 6 signals are always in the Teensy-to-LCD...

Not all of the chip's pins can come to the outside pins on Teensy. Some are connected to the ethernet and flash chips on the PCB. Some aren't connected to anything at all, only because it's not physically feasible to...

This probably won't help much, but here's a page written 10 years ago when I tested Oleg's original hardware (long before any Chinese clones existed) with Teensy 2.0 and Teensy++ 2.0, which were the only 2 Teensy models...

Please show complete programs. Even if the rest of the code is trivial, it is much easier to answer if we can copy the code into Arduino and run on a Teensy without the work of adding (guessing) the missing lines.

The connector is a "magjack", which means is more than just a plain RJ45. It has the ethernet magnetic coupling parts built in. The kit does more or less just break out the pins, but to a magjack. It also has 1...

USB can do 2 meters. It's the way needing the least amount of extra hardware, just a good quality 2 meter cable. USB provides power, but for 2 meters make sure the cable has #24 or larger wires for the power. Cheap...

Good point. The documentation on the USB serial page says: "Initialize the Serial object. The baud rate is ignored and communication always occurs at full USB speed." I've updated that page with better info.

You can generally expect Teensy 4.0 & 4.1 to give about 25% better DSP performance than STM32H7. They have exactly the same Cortex-M7 processor, but Teensy's runs at 600 MHz compared to only 480 MHz on the STM32...

Well, this is also a discussion of pinout & form factor for the next Teensy.

Like most details of the audio library, it's documented in the design tool. If you click any of these 3 outputs in the left column, their documentation appears in the right side column. Scroll down to "Hardware"...

I've updated the Serial.rts() documentation on the website to mention this Windows bug, with a link to this thread. https://www.pjrc.com/teensy/td_serial.html

Quick followup to this old thread, 1.47-beta7 adds more detailed printing of memory usage. It does most but not all of the things discussed here. This is the source code:...

I unblocked this IP.

I've updated the 6 main product pages to have the word "analogWriteFrequency" (in the Digital Pins > PWM section) link directly to the part of the PWM page about controlling the frequency and which pins are associated...

The purpose here is to improve compatibility with code designed using Arduino Uno & Mega, even if we can't get to the bottom of what really went wrong with JaredReabow's system. I do not believe adding a...

Thanks everyone! ;)

This is how I2S works. Teensy sends BCLK and LRCLK to the SGTL5000 chip. Then it transmits data bits on each BCLK. In the mode we use, the SGTL5000 has no control over the clocks. It has to use whatever clock it...

On the Teensy 4.1 page: https://www.pjrc.com/store/teensy41.html Scroll down to "Software" and look for "Command Line with Makefile". We use an older version of gcc. Sometimes newer versions print warnings or...

I've merged the latest code, moved the constants into the class private members, and taken a few small liberties with the public API to make it similar to the rest of the audio library. Documentation still needs...

Hypothetically... if I were to add this for Teensy LC - 4.1, which PC-side software should I use for testing? A big question I have, which can probably only be answered by experimenting, is whether the PC software...

I've updated the pinlist example. https://github.com/PaulStoffregen/OctoWS2811/commit/affd97eb9d670cdabeedf94e2f78013f833a6216

Yes. SD was changed to a thin wrapper around SdFat (so all SD card access is SdFat) back at 1.54-beta3. https://forum.pjrc.com/threads/64235-Teensyduino-1-54-Beta-3

Even though the while (!Serial) doesn't explain the lockup where pressing the pushbutton was needed, I do believe it's time to reconsider the previously failed attempt to have Serial.begin() wait. I'm going to put...

Two things... 1: The same PCB is used for both Teensy 3.5 and 3.6. 2: This was my first BGA and first 6 layer PCB design, which was done under time pressure for a Kickstarter campaign launch. A *lot* of work when...

Before merging this to the audio library, I want to see these new constants moved either inside the class definition (eg, at static const types) or to the cpp file. I can do it, if you would like to go with whatever...

Lower source impedance allows for the voltage sampling capacitor inside the chip to charge (or discharge) to the right voltage during the limited time for sampling, and it also helps overcome small errors due to "charge...

Hopefully this can help? https://forum.pjrc.com/threads/60599?p=238070&viewfull=1#post238070 There's a photo of the wiring and a video demo! This particular microphone has a DC offset. You probably want to...

Try uncommenting this line in usb.c //USB1_PORTSC1 |= USB_PORTSC1_PFSC; // force 12 Mbit/sec

First, a quick disclaimer, this message isn’t a contractual promise or guarantee or legal advice. PJRC currently has no plans to discontinue Teensy LC or any of the 32 bit products. While I can’t predict the distant...

Just to repeat, I did indeed run the code you shared on a Teensy 4.1 here. I was able to upload several times without pressing the pushbutton. I can’t explain the behavior you have described. But I did test with a...

This is a really intriguing idea, to just use ethernet as a raw serial-like byte stream at 100 Mbit speed. Or maybe as a raw packet delivery? If the ethernet mac is configured in promiscuous mode and automatic...

Maybe Teensy is transmitting "*** ONLINE ***" before your PC is able to complete USB detection, and then you interpret the lack of that message as the USB device not working? But that doesn't explain needing the press...

Nope. The cards are always included for distributors. The distributors get the cards bulk packaged, usually in sets of 100. But mistakes and misunderstandings can happen. Sometimes a person will misplace the bulk...

I'm really sorry this happened. Every Teensy is always supposed to come with the documentation card. Robin & I will contact TinyTronics.... If you want the original printed card (which is much nicer & more...

I might be reading too much into your question, but it sure sounds like you have a misunderstanding how of how programming Teensy really works. The "Arduino language" really is just C++ which very minor...

I believe you should test without the Moxa products. If the same error happens with both plugged into the same LAN, that is much easier to reproduce and investigate. If the error only happens with Moxa, perhaps it...

Which Teensy pins each configuration of input & output uses are also documented in the design tool right-side panel.

The answer depends on so many unknowns. Nobody could possibly give you a definitive answer. The best anyone can do is help you figure out which things you need to know, or just make up some numbers by sheer guesswork....

Yup, PCM1808 is really simple. You can use either I2S or I2S2 on Teensy 4.x. Just connect the 4 signals. MCLK is named SCKI on that chip. The other 3 have names the same as Teensy uses. PCM1808 has 3 config pins....

That's not how unwanted ground loop currents work. They change the observed signal by altering the ground reference. The signal could be absolutely perfect, but if you alter the ground voltage seen by the equipment...

Looks like this project isn't using USBHost at all. But yeah, improved USB host MIDI transmit was recently put into USBHost_t36 and it's in 1.54-beta7 (published yesterday). Part of that improvement is a change to...

Pretty sure that's on me. I've never bothered to put metadata beyond the bare minimum into the resource file. It only has the program's icon and an XML file that prevents the "This program might not have installed...

Yeah, this beta was prompted by changes to the builds on all 3 operating systems. On Windows, we were forced to get a new code signing cert. They rubber stamp reissue the old one if you renew within 39 months. The...

Two questions for everyone using Windows 1: Is Teensy Loader chewing up CPU while idle, like it was on Linux? 2: How difficult is the download & install (before Microsoft's servers re-learn PJRC is safe)?

I2S slave mode causes the entire audio library to run at the sample rate dictated by the incoming LRCLK signal. Hopefully the fundamental reason why 2 ports running in slave mode can't work is apparent. Someday...

It should work, but hasn't been tested.

Maybe I should package up 1.54-beta7 today, or soon-ish? Might also be a good time to test Windows installs signed with the new cert (PJRC was forced to renew a couple weeks ago).

You can also click the button to skip the udev rules check.

I'll admit, I've sometimes wondered if the 512 tap FIR filter was really a good idea. I wrote the code more as a challenge to see if Teensy could implement such an extreme filter rather than a careful plan. The...

To quickly answer your 3 questions... Yes. For Teensy 3.2, in mk20dx256.ld on line 49:

Arduino Uno is woefully underpowered, only 8 bits and only 16 MHz. Uno also lacks DMA to efficiently move data between memory and audio hardware. It has no hope of running the audio library code. Your best path is...

Feels good to finally get these many lingering Linux issues fixed. :)

Probably not worthwhile. I tested 32 bits on Raspberry Pi 4. Unless Kurt turns up any more issues, I'm going to cross ARM64 troubles off my bug list.

Did you run 32 bits or 64 bits on your Raspberry Pi? So far, I've only tested 32 bits. Yup, added the hidraw rule. The usb subsystem rule also applies. But it looks like the more complex wildcard syntax is buggy...

Today I went down the deep rabbit hole of Linux udev rules. To make serial raw mode configure work well on Raspberry Pi, I had to rename the file from 49-teensy.rules to 00-teensy.rules. ...

Well, after much removing and restoring files, I finally tracked it down to this line (meant for some Arduino.org boards): SUBSYSTEMS=="usb", ATTRS{idVendor}=="05e3", ATTRS{idProduct}=="*", MODE:="0666" I have...

Arduino kinda does support UTF8. If you type or copy non-latin characters into strings, the Arduino IDE does end up putting UTF8 encoded strings into memory. And if you transmit UTF8 encoded data to the serial...

Yes, I agree. But so far, I can't reproduce the problem on my Linux desktop. The /dev/hidraw devices are being created with open permissions.

This new size program parses the binary .elf file directly, so we're not depending on the specifics of a human readable text format. ELF 32 bit is a very stable binary format. I tried to keep the main program part...

Yes, a check for not enough RAM1 left for a reasonable size stack is a good idea. If you feel like doing this, please add it and send a pull request. To show an error in red text, just print to stderr without the...

Yup, a harmless warning. Fixed on github. https://github.com/PaulStoffregen/teensy_size/commit/492d4b76d8844a770e06ac48a7cf8574b27bfdb5

I changed teensy_size to print to stderr and prefix each line with "teensy_size:". This causes the size report to be visible in both verbose and non-verbose mode. But Arduino shows it in alarming red color. I'm...

I might just patch the Java code to run it, if builder doesn't give a way to have its output seen in non-verbose mode.

Minor problem... looks like arduino builder discards all the stdout printing in non-verbose mode. :(

I'm going to edit the linker scripts. Now that we can print more detailed info, having too much stuff lumped together in the .text.progmem segment means we get inaccurate info. If you grab newer versions of...

Plan is not using builder's regex stuff. So add this to platform.txt recipe.hooks.postbuild.4.pattern="{compiler.path}teensy_size" "{build.path}/{build.project_name}.elf" and delete the...

The code on github right now prints this, for the LadderFilter example compiled for Teensy 4.1. FLASH: code:59452, data:6152, headers:7212 free for files:8053648 RAM1: code:65536, variables:21184 free for...

I'm kinda hoping for a replacement. Committed some code on github towards that goal.

Is anyone using a different PDM chip than MP34DT01-M or MP34DT05-A?

I'd like to ask everyone who wants me to work on this a question. Which PDM microphone or chip are you using? (hint: I'm more motivated by seeing photos...)

To learn everything in such detail is a huge undertaking. It could reasonably be expected to take years to cover it all in a "deep complete basis". So with that in mind, you could think of learning probably 6 broad...

Here is the elf parsing code. https://github.com/PaulStoffregen/teensy_size Want the final result to be compact in the non-verbose mode, probably 1 line per memory region shown on the product page (so 3 lines for...

Should be possible. You need to edit usb_desc.h inside {Arduino}/hardware/teensy/avr/cores/teensy4 (or teensy3 - there are 2 copies of this file). See the comments in the top of that file for instructions.

Would you like me to investigate? I need a complete program I can copy into Arduino, even if the rest seems "trivial".

I'm not sure what to do with PlatformIO, but here's a link to the Servo library Teensyduino uses. https://github.com/PaulStoffregen/Servo Maybe you can somehow import this to PlatformIO?

I've built the ARM 32 & 64 bit versions. Here are links to all 4 Linux installers. ARM 32 bit https://www.pjrc.com/teensy/td_154-beta6c/TeensyduinoInstall.linuxarm ARM 64 bit...

Don't waste too much time on the old version on Raspberry Pi. I'm updating the ARM64 build to GTK3.

Even if Princeton discontinues the genuine PT8211, seems pretty likely the Chinese counterfeits will remain.

Try the installer on msg #36. Should be fine to install this "on top of" the 1.51 install you already have. Or extract a fresh copy of Arduino and install into it, if you want to have both copies side-by-side for...

Kurt, can you remind me about the problems you saw with ARM64 Ubuntu running on Raspberry Pi?

Ok, here a first attempt at building Teensy Loader with GTK3. https://www.pjrc.com/teensy/td_154-beta6c/TeensyduinoInstall.linux64 https://www.pjrc.com/teensy/td_154-beta6c/TeensyduinoInstall.linux32 Hopefully...

Don't choose postal air mail to China. It takes forever and often packages just disappear in the void. Click the expensive UPS option. Robin can sometimes substitute DHL for UPS if it's less expensive. If you want...

I still haven't figured out exactly what's different between 20.04.1 (fast after updates) versus 20.04.2 (slow startup even after updates). But the "big picture" view appears to be that support for GTK2 is dying. I...

I'm continuing to work on this today. I want to better understand why this happens and what's truly different between 20.04.1 and 20.04.2 before I decide on the best (or least painful) workaround. Don't worry. ...

After some rest, I restarted this testing with a more methodical approach. Looks like Ubuntu has published 4 different .iso images: 20.04 20.04.1 20.04.2 20.04.2.0 This time I set up 4 VMs and installed each. ...

Just place the order on the website. If you have questions, ask them here. Don't email or call for any questions. All questions need to be asked & answered here on the forum. After you've soldered the chip to...