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    For what it's worth, Mouser is showing about 900...

    For what it's worth, Mouser is showing about 900 in stock. Digi-key is out of stock.
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    Not Paul, so I can't speak for PJRC, but the...

    Not Paul, so I can't speak for PJRC, but the IMXRT seems to be on a 26 week lead from most distributors. Frankly, I'm just happy that it's not 52 weeks given the state of the industry right now. NXP...
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    Will do, thanks!

    Will do, thanks!
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    Now that the MKL02 has compatibility with the...

    Now that the MKL02 has compatibility with the IMXRT chips, would the MIMXRT1062CVJ5B or the MIMXRT1062CVL5B have the highest likelihood of working with the MKL02 designed for the MIMXRT1062DVJ6A/B...
  5. FYI, I did a pretty major update to the MAVLink...

    FYI, I did a pretty major update to the MAVLink library:
    https://github.com/bolderflight/mavlink

    It now supports:
    1. The heartbeat protocol
    2. Sending status messages to the ground station
    3....
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    For custom boards, the MKL02 needs to be...

    For custom boards, the MKL02 needs to be purchased from PJRC. Same limitation of the USB based firmware upload. The nice thing is that if you spin your own Teensy board and use a Raspberry Pi compute...
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    The only official way to upload code is via the...

    The only official way to upload code is via the Teensy USB port. If you have the Teensy USB plugged into the Raspberry Pi, that seems like it would be the most straightforward approach, use the hex...
  8. Hi, I wrote an SBUS library for Arduino,...

    Hi, I wrote an SBUS library for Arduino, including Teensy 4.x, maybe that will help?
    https://github.com/bolderflight/sbus-arduino/
  9. Thanks, that works for me on Teensy 4.1: ...

    Thanks, that works for me on Teensy 4.1:


    Teensy Loader, Command Line, Version 2.2
    Read "spi_example.hex": 18396 bytes, 0.9% usage
    Soft reboot performed
    Waiting for Teensy device...
    (hint:...
  10. Oh nevermind, I was testing with a Teensy 3.6,...

    Oh nevermind, I was testing with a Teensy 3.6, since that was what I happened to be working on. Tried again with the Teensy 4.1 and I can repeat the issue - no soft reboot working for me either.
    ...
  11. I just checked my use case again. If I don't have...

    I just checked my use case again. If I don't have the Teensy plugged in and powered on, my readout is:


    Teensy Loader, Command Line, Version 2.1
    Read "spi_example.hex": 15572 bytes, 1.5% usage...
  12. We'll need more details - is it hanging on ...

    We'll need more details - is it hanging on


    Waiting for Teensy device...
    (hint: press the reset button)


    Or is there some other problem? Have you installed udev rules? Is the teensy...
  13. Yes, use the teensy_loader_cli with the '-s'...

    Yes, use the teensy_loader_cli with the '-s' option.

    See:
    https://www.pjrc.com/teensy/loader_cli.html
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    Hi Robert, Check out this thread:...

    Hi Robert,

    Check out this thread:
    https://forum.pjrc.com/threads/54114-Extended-Pin-Numbering

    It's about a custom 3.6 and using the additional pins. In short, you may need to update...
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    Thanks! I actually meant air pressure as a...

    Thanks! I actually meant air pressure as a replacement for the BME280.

    Regarding staging, when I was working as a researcher at NASA AFRC, we had a close-call where the Flight Termination System...
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    Also, if you have good experiences with a...

    Also, if you have good experiences with a different static pressure transducer, please let me know.
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    So far our Flight Control Systems have only used...

    So far our Flight Control Systems have only used the Teensy 3.6. I do see noise on the BME280 if there is any sort of transmitter on the vehicle. Haven't had any issues with SD or any of the buses....
  18. I could be wrong, it's been a few years since I...

    I could be wrong, it's been a few years since I messed around with the Teensy 3.6 startup code, just one of the things that is sticking out at me on a quick glance.
  19. I don't see a crystal on the RTC. On Teensy 3.5 /...

    I don't see a crystal on the RTC. On Teensy 3.5 / 3.6 it's included on the board - I wonder if the startup code should be edited for it?
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    Paul, is the board designed to a temperature...

    Paul, is the board designed to a temperature range (i.e. -40 to +80)? Thinking that this could be cost effective for a commercial product I'll be developing later this year.
  21. I use CMake for Teensy 3.x, 4.x, and LC:...

    I use CMake for Teensy 3.x, 4.x, and LC:
    https://github.com/bolderflight/core/

    Has 'hex' and 'upload' targets and uses the command line uploader for uploading to the Teensy. It's modified from...
  22. Thread: uBlox Library

    by brtaylor
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    My library works fine at receiving the high...

    My library works fine at receiving the high accuracy GNSS data that you'll get from applying CORS or RTK corrections. Be sure to download the latest from:...
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    You'll need the ground wire, only the power...

    You'll need the ground wire, only the power should be cut. Otherwise you can cut the trace on Teensy to separate VIN from VUSB and use a standard USB cable.
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    Ideal world we would have 3 layouts of each...

    Ideal world we would have 3 layouts of each teensy:
    1. Current Teensy breakout for solderless breadboarding
    2. MM for compact product integrations
    3. DDR2 SODIMM (i.e. Raspberry Pi Compute Module...
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    Not from PJRC and not my work, but this Teensy...

    Not from PJRC and not my work, but this Teensy 3.2 reference board clone has a BOM:
    https://github.com/thewknd/teensy-boards/tree/master/Teensy%203.2%20reference%20board%20clone

    I built it years...
  26. Is there a good definition of the protocol? All...

    Is there a good definition of the protocol? All I've found is forum and github discussions - enough to understand the approach, but not enough to write a driver.
  27. Thanks! It seems pretty daunting and I'm not sure...

    Thanks! It seems pretty daunting and I'm not sure if it'll be successful. Probably faster to just make another GCS from scratch.
  28. I just thought I would add that looking at the...

    I just thought I would add that looking at the bits/second isn't the best measure because they aren't spread evenly over the time interval. I'm running this on a control system running at 50 Hz. If...
  29. I send the heartbeat at 1 Hz, the GNSS data as I...

    I send the heartbeat at 1 Hz, the GNSS data as I get new data from the receiver at 5 Hz, and the attitude, speed and heading, and battery voltage at 25 Hz.

    The packet sizes are:
    * Heartbeat: 9...
  30. It's a very small piece of code, but I wonder if...

    It's a very small piece of code, but I wonder if this would help:
    https://gitlab.com/bolderflight/software/mavlink

    I wrapped a class around a few of the mavlink packets I use for our flight...
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    Works great Paul.

    Works great Paul.
  32. Yes, it can be done. I use the -s option on my...

    Yes, it can be done. I use the -s option on my linux boxes that only have one Teensy connected, that often means that I don't need to press the program button or use a GPIO to "press" it.
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    Hi Paul, Can confirm the sha1sum and Teensy...

    Hi Paul,

    Can confirm the sha1sum and Teensy Loader 1.54-beta6b

    23737
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    Ditto, it doesn't fix it on my Ubuntu 20.04...

    Ditto, it doesn't fix it on my Ubuntu 20.04 either.
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    Just to be clear, IMUs don't measure angles, they...

    Just to be clear, IMUs don't measure angles, they measure angular rates (i.e. deg/s), acceleration (m/s/s) and sometimes magnetic field (uT). You'll need a filter to estimate the attitude from those...
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    MPU9250 is way faster on SPI than I2C. It's been...

    MPU9250 is way faster on SPI than I2C. It's been several years since I tested the performance, but if I recall correctly it's something around 22 us to get data from one IMU on SPI and around 200 us...
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    Which IMUs? EDIT: nevermind, saw the code...

    Which IMUs?

    EDIT: nevermind, saw the code snippet of LSM9DS1.

    I haven't worked with that IMU, but just based off the fact that SPI is available, my initial reaction would be to go with SPI....
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    Likewise, I have a couple work computers that I...

    Likewise, I have a couple work computers that I still need to put new operating systems on and can use them to try fresh installs of different operating systems for testing.

    I took a screen cast...
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    Just chiming in to add that I recently installed...

    Just chiming in to add that I recently installed Ubuntu 20.04 on one of my work computers and it happens to take a while to bring Teensy loader up the first time. Verify / load fails until it...
  40. Thread: uBlox Library

    by brtaylor
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    I've also been using the Ardusimple and assumed...

    I've also been using the Ardusimple and assumed that UBX-CFG-VALSET would be the preferred method with the ZED-F9P and any future receivers.
  41. Thread: uBlox Library

    by brtaylor
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    It looks like uBlox now prefers UBX-CFG-VALSET...

    It looks like uBlox now prefers UBX-CFG-VALSET and UBX-CFG-VALGET to set and get configuration values. Is anyone familiar with that approach?
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    Regarding the usage, SBUS shouldn't be doing...

    Regarding the usage, SBUS shouldn't be doing anything with interrupts on Teensy 4.1. I would probably try printing the value of pos and see if that makes sense.
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    I just wanted to quickly point out that the...

    I just wanted to quickly point out that the correct GitHub for the SBUS library is:
    https://github.com/bolderflight/sbus-arduino

    We have a bunch of libraries that work together to make flight...
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    Teensy 4 USB hits 480 Mb/s. ...

    Teensy 4 USB hits 480 Mb/s.
    https://forum.pjrc.com/threads/60609-Maximum-Data-Rate-still-12-Mbit-sec-for-the-Teensy-4-0?p=236797&viewfull=1#post236797

    I'm guessing there's maybe some limitation...
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    By Serial do you mean the hardware serial or the...

    By Serial do you mean the hardware serial or the USB? Are you able to buffer data or do you need it streaming in real-time? Are you sending ASCII characters or binary data?
  46. Thanks, that's really good feedback and gives me...

    Thanks, that's really good feedback and gives me some options to consider.
  47. Hi Kris, did you ever manage to get this to work?...

    Hi Kris, did you ever manage to get this to work? Thanks much!
  48. Well, the issue is that the AIN example is...

    Well, the issue is that the AIN example is reading POT values and sending that to SBUS servos, which is not really what you're trying to do as far as I understand it. The below example, just reads...
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    Here's a very simple program that can compile...

    Here's a very simple program that can compile directly under Linux, instead of needing to cross compile, that illustrates the issue:



    #include <cstdint>

    #define SIM_SCGC4 (*(volatile...
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    You could probably develop an e-reader / writer...

    You could probably develop an e-reader / writer without the OS in a fraction of the time.
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