I'm seeing a strange difference between between the 2 oscillators. Or maybe not so strange... but still getting used to the little unexpected behaviors of this chip.
We built all the betas with a 24 MHz crystal...
Fortunately the GPT timers can use the 32 kHz crystal, and two of the Arduino assigned pins are the input capture signals for GPT1. :)
Here's a little program I wrote to try directly measuring the crystal. Going to...
Encrypted updates will probably never happen on Teensy 3.x. Without a reliable hardware mechanism for storing & using the encryption key, security is at odds with "brickability". Even if you're willing to risk your...
Yup, I finally started bringing in the many C-only "experiments" into Arduino. :)
At this moment I have 11 high priority items on my list which need to be completed before we start shipping beta boards. None are in...
You probably want TEENSY_REBOOT.EXE. It's default install location is C:\Program Files (x86)\Arduino\hardware\tools.
It's a command line utility. Normally it talks to Teensy Loader, to make sure auto mode is set...
Usually only 3 sounds can be played simultaneously from the SD card. It's the Arduino SD library limitation.
About a dozen sounds can be played simultaneously from a serial flash chip. Those chips have very low,...
Arduino compiles your code in a temporary directory. Find that folder. On Mac and Windows, it's often in a hidden location. Turning on verbose output while compiling in File > Preference causes Arduino to print a ton...
You need to use quotes for this include, not angle brackets.
Use of <Measure.h> means the file Measure.h is to be found only in a library, not as part of your program.
Next time you post a program for us to look...
I know we've heard "no other connections", but if the USB ports work with other devices like keyboards, there really isn't any other plausible explanation for how this could happen with everything working and then...
Several people have requested this over the years. I'm considering adding it. This is a situation many people encounter, there they're using a different machine or the project was made years ago with a laptop that's...
We could offer a better opinion if we could actually see this stuff... like with photos.
Or maybe you could be more specific about what a "JST wire" really is? Maybe a link?
Just a blind guess (literally blind -...
You can disable the pin's interrupt by writing to CORE_PIN30_CONFIG. Or you can disable all interrupts with noInterrupts(), as I showed in the code on msg #30. The NVIC also has a way to mask each interrupt. Use...
Crazy as this may sound, polling might be an option. But it comes with huge caveats. You can't do anything else while waiting for the pulse. You also need to have interrupts disabled if you want consistently low...
Here's how to get the fastest interrupt response by directly configuring the port register. I took the code from msg #3, removed all the unused stuff, then substituted these lines for the slow attachInterrupt(). I...
Did the breadboard have *any* other non-power wires to the world? Like maybe connection to something else which is connected to earth ground? Or something that should have been grounded, but was actually "hot"? ...
There are 2 ways to think about I2S (or any other hardware) capability.
1: Hardware specs - what is possible if you write your own drivers and all the code
2: Well supported software - what you can do easily, with...
Here's a few more that are currently in the queue to appear on the website blog.
http://little-scale.blogspot.com/2018/12/teensy-36-as-standalone-mediator.html
...
But I can tell you those SetupDiBlahBlahBlah functions work on all versions of Windows, at least as far back as Windows 2000.
They're also very difficult to use and the finer details can vary quite a bit between...
Maybe SetupDiEnumDeviceInterfaces & SetupDiGetInterfaceDeviceDetail & SetupDiGetDeviceRegistryProperty?
Just a blind guess, since I don't have the USBDeview source code, nor have I ever even used that program. In...
No, and I'm not planning to mess with the test fixtures we use, at least not anytime soon. This sort of update is pretty much at the bottom of my priority list right now.
WorldSemi recently announced all new WS2812 will be compatible with 3.3V signals.
So yes, in the future they will all work with every Teensy and the many other boards on the market using 3.3V. Almost nothing uses 5V...
Ok, I believe I see what's causing the NullPointerException.
Here's an attempt to fix it. To install this, extract the ZIP file to get pde.jar. Then copy it to the "lib" folder inside Arduino, replacing the pde.jar...
At this point, most hardware design decisions are set in stone (or FR4 fiberglass). However, which pins we'll sacrifice to get the CAN FD pins is still unresolved. The first beta will have the pinout of msg #181,...
Yes, or at least mostly, or "sort of" follows AC97.
Really, the intention is most cables from PC that connect the motherboard to a front panel can work with this audio shield.
FWIW, on the next Teensy we're adding a red LED which will be dedicated to the bootloader, to show status of what it's actually doing. I'm still working on the details, but there will definitely be a dim blink to show...
Could also be a wrong baud rate with a serial device, maybe with "TheThingsNetwork"? But this too is just a blind guess, since we can't see much about what you're doing.
Maybe this is a good moment to share the...
Did you buy the chip from Adafruit? If so, please also ask on their forum and give us a link, so we can see what they answer.
Quickly...
Pin 1 (1OE) - connect to GND
Pin 2 (1A) - connect to Teensy output
Pin 3...
One thing I don't quite understand is how that FreeMem() function (msg #2) is printing numbers slightly larger than the 57216 bytes (msg #1) Arduino's memory summary said are supposed to exist after subtracting the...
The correct solution - the official way Arduino's IDE is meant to be used - is each "platform" you install is supposed to have its own customized copies of libraries like Servo.
That's why Teensy's version is Servo...
I've been seriously considering this. The change to native teensy_serialmon with stdin/stdout so Java never talks to the hardware was meant as a first step in that general direction. Well, and of course to solve the...
Just to realistic, even though this is near the top of my priority list, at this moment I'm working on new hardware (which is already way behind schedule). Might not be able to do much with this for a month or two.
...
I'm running it here with Arduino 1.8.8 and Teensyduino 1.45 on MacOS 10.14.2 (Mojave).
Looks like we may indeed have trouble with maximum sustained data rate on this newer version of MacOS. I'm seeing it appear...
Can't reproduce the problem here. Looks fine when I try. Here's a screenshot.
Maybe I tried the wrong way? Any chance you could be more specific about the problem? Maybe show a screenshot, so we can actually...
Oh, I'm really curious to see how the waveforms really look when measured with 500 MHz bandwidth!
Here's an old thread with the best I could do having only a 200 MHz scope.
...
Ah, now we can see the real problem.
Looks like at some point you installed a copy of Servo in your Documents\Arduino\libraries folder.
When you do this, your installed library always overrides any others with...
Yeah, on Teensy 3.6 you just use the 2nd port as USB host.
All you need to do is solder a 5 pin header to those holes and connect a USB cable.
But DO NOT add resistors. It's meant to connect directly using...
Because you still have the example you opened from the File > Examples menu when Uno was selected. That one doesn't work on Teensy.
Close the Window with this example (and make sure at least one other Window is...
Yeah, the Arduino port selection is less than ideal. We're juggling 3 different approaches. You can have a "Teensy" port selected, or a "serial" port selected, or nothing chosen at all. When uploading, those latter 2...
Before you begin your custom PCB design, I would recommend getting a Teensy 3.5 and building a prototype on a soldless breadboard or by soldering parts on a perf board.
Regarding your questions of how many of each...
Thanks for testing. :)
Yeah, looks like the Arduino devs changed some stuff. It was never in any particular order. The Teensy specific ports used to end up first due to something about the order of instances...
This is an old thread, but someone pointed it to me today... and it looks like I never answered this last question.
Assuming the CPU and memory are actually working reliably at those speeds, the timing functions like...
You keep saying "serial port", so I want to be clear that Teensy sometimes uses serial or other protocols, other times uses HID protocol. We get this misunderstanding pretty often from people who are very used to...
On Teensy LC, the flash wear leveling depends only on the total number of byte size writes you perform. Each 1 byte write uses 2 bytes of the 2K flash reserved for the EEPROM emulation. Hopefully it's clear from this...
Maybe understanding why the max limit is 254, and why the default is lower might help? I don't believe I've ever written about this... so here goes. But the clear message for Teensy LC is this: 254 is the max. Don't...
Have you tried the edit of E2END in eeprom.h, as suggested in msg #20?
For a little more detail, when you find that file, here is the code you'll see:
#if defined(__MK20DX128__) || defined(__MK20DX256__)
...
One message, several replies...
I've added these lines to boards.txt. Look for it in beta2 (coming soon)...
Any idea whether Teensyduino is responsible for adding these problems, or if they would happen...
If you only consider the cost of semiconductors, then of course a few 50 cent logic chips seems a lot less expensive than another $12 or $20 microcontroller board.
But the reality is both approaches have plenty of...
I wonder if Windows is sending 1 MIDI message per USB packet?
Years ago, I create a benchmark to test how well Teensy could receive LED data. For programs that write data in large blocks, all operating systems...
They're planning to eventually have a "pluggable" serial monitor API. So maybe there's some long-term hope, not that they'd accept this, but provide a way it could be added as a plugin.
The built in DAC on Teensy 3.2 is not capable of directly driving headphones.
It's output impedance is too high (weak) to drive the headphones, and it has a DC offset. Neither of those are good for direct...
If anyone tries the Mac version on Mojave (10.14), does it give a 32 bit code warning?
I saw one, but can't seem to reproduce it now. Trying to figure out if something from Teensyduino is still 32 bits and offending...
Maybe you're experiencing the Windows 7 driver bugs in USBSER.SYS? The sad news is all pre-10 versions of Windows have this very confusing bug in their serial driver, where the *next* time you try to use the port it...
Yes, using multiple boards is certainly possible.
Without knowing anything about your project, I can only give very generic advice...
Using them as mouse, keyboard and joystick, the main challenge is the PC side...
Seems 180 of the removed pages are from table of contents, which was ridiculously long on Rev 1 due to fully expanding all the sub-sections. Doesn't look like they actually removed any significant info.
It's still...
Using the audio library, the DAC output defaults to 1.2V peak-to-peak range.
That's pretty close to the -10 dBV "line level" used by consumer equipment (0.775V AC RMS). However, the DAC has an output impedance of...
The "" means Windows is not behaving. It's not Teensy's fault. Windows is detecting the device but not loading its USBSER.SYS driver properly. This is absolutely happening on the Windows side. I added that ""...
I want to clearly communicate that the AudioStream base class was not designed to provide this sort of functionality, while at the same time stopping short of saying there isn't *any* way.
AudioStream was designed to...
These pins in the red circles have identical USB device functionality. The are the same primary USB port on 3.6 as you had on 3.2.
These pins in the blue circle are the secondary USB host port.
Looked at your code again just now. Can't see any reason why pin 15 would behave differently than 14, 16, 17, 18, 19.
The alternate functions of pin 15 aren't used. The situation is the same as all the other analog...
For the audio stuff, this tutorial is the best place to start. There's a 31 page PDF and a 45 minute video (same material as the PDF).
https://www.pjrc.com/store/audio_tutorial_kit.html
I managed to contact someone from World Semi (on Facebook, of all places...) and they confirmed "VDD=4.5～5.5V" is a mistake in the WS2815 datasheet. They said it will be fixed. No idea of the time frame.
I'm...
You could try editing AudioStream to set the block size to something small, like 16 samples. There's also some delay in the ADC and DAC, assuming you use the audio shield or similar hardware.
Most of the audio...
However, be very careful never to plug the USB cable in while the battery is connected. The last thing you want is 5V power from your computer running directly into the 3.7V battery, or your 3.7V battery trying to...
Yup, problem solved. Teensy 2.0 can run just fine on 3.7V.
All we needed was a little more understanding of your project. Before msg #13, nobody could have known what your power source really was. We all tried to...
Your code fragment is the correct way.
Maybe something is wrong in the rest of your code? Or perhaps something isn't right on the hardware side? We can't see your screen or your wires to actually help, unless you...
Pretty sure the key to high sustained LPSPI throughput for a larger block of data is configuring a big frame size in TCR. It's on my list to do soon. Right now dealing with the finer points of USB VBUS detection and...
Most of the output objects have 2 buffers. In hindsight, really only 1 is needed. Eventually I'm going to update them all to avoid buffering a 2nd packet, which should gut 2.9 ms from the latency.
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