PaulStoffregen
Senior Member

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...

I've reinstalled 20.04 a few times and I just can't reproduce the slow startup again, even with the old versions. Not sure where to go from here?

Oh so frustrating. Now I can't reproduce the problem in a VM, even after a fresh install without even installing the VM'd tools/drivers. Yesterday I was definitely able to reproduce it. No idea what changed. :(

Can you do a couple quick checks? When it does finally appear, what version does Help > About say? The file in your {Arduino}/hardware/tools/teensy is supposed to be 7809344 bytes and should have this sha1sum: ...

FWIW, the problem as I understand it is the GTK developers completely changed how menus work. It's apparently a lot more complicated than just code inside 1 program, as the new system allows each window's menus to...

Ok, here's a fix for the slow startup issue on Ubuntu 20.04. https://www.pjrc.com/teensy/td_154-beta6b/TeensyduinoInstall.linux64 I also put some work into the long-standing bug where Teensy Loader consumes...

Any chance you're using Ubuntu 20.04? Might be this issue. https://forum.pjrc.com/threads/62809-Teensy-Loader-slow-to-start-up

Looks like Ubuntu 18.04 is the oldest (of the LTS releases) which builds a fast startup Teensy Loader for Ubuntu 20.04. The 18.04 build at least loads on 16.04, but it can't run at all on 14.04 due to C library...

I'm continuing to work on this problem. The root cause seems to be related to appmenu-gtk2-module not installed by default, so Ubuntu 19.10 and 20.04 don't support programs using the older GTK2 APIs. Seems Teensy...

Have you tried without the Moxa wireless devices?

I was finally able to reproduce this problem inside a virtual machine. Hope to get to the bottom of this soon and find a fix for 1.54-beta7.

The envelope effect probably doesn't make much sense for this application. It's meant to turn a steady waveform into a note which starts & stops. But the sound you're processing already starts and stops. Even if you...

Every chip with a Cortex M0 inside uses its own method of programming memory. While the M0 might play a role in the programming, the specific programming details aren't part of the M0. Chips from different companies...

In terms of bandwidth, USB at 480 Mbit/sec is definitely the fastest way to communicate. The serial ports do offer a nice simplicity though, where latency is much easier to anticipate. They can run at 6000000 baud,...

This is exactly what the envelope object does. It blocks all sound until you call noteOn(). Then when you call noteOff(), it fades the sound out and again blocks everything. Normally envelopes are used after...

I recall looking at Opus some time ago. It wanted 8 kHz sample rate back then. Almost everything we do is for 44.1 kHz.

You can also use analogWriteFrequency with any of the PWM pins. But you'll get 32765.4 Hz, because it has to use an integer division of the 150 MHz peripheral clock. That peripheral clock also comes from the ARM clock...

On Teensy 4.1, you can access it here:

To turn on the 32 kHz clock output at that pin, use this: IOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B0_00 = 2; // AD_B0_00 = REF_CLK_32 Details on page 472-473.

Yes, it is GPIO_AD_B0_00, which is pin M14 on the BGA. On Teensy 4.0 it can be accessed at this bottom side test pad.

On Teensy 4, try using 1.54-beta6. I believe we lowered the default SPI speed to only 16 MHz so more of those cheap level shifter boards could work by default. ...

You can subscribe to the announcements forum. https://forum.pjrc.com/forums/6-Announcements Look for the "Forum Tools" drop-down menu on that page.

Should I merge this into the audio library? I see it already has the MIT license header. :) Would be nice to get it into 1.54-beta7 so more people can get access and test it... before a 1.54 release. On the...

That AD5679R chip looks amazing. And for the price, it really ought to be! SPI protocol is designed by "burst" style access. Achieving sustained full audio bandwidth output at a low-jitter sample rate is really...

Updated on github. https://github.com/PaulStoffregen/Audio/commit/96d0c98a045d56e07cf881c73a4996f52648b719