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  1. Replies
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    Still works great, thanks!

    Still works great, thanks!
  2. Thread: MK20 PTA3 Debug

    by Markk
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    Still not yet? Thanks, Mark

    Still not yet?

    Thanks,
    Mark
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    Are there any Snooze power consumption...

    Are there any Snooze power consumption measurements for the Teensy LC?

    (Haven't found any.)

    Since the LC features the MKL26Z64VFT4 supposedly a "ultra-low-power MCU" this should be...
  4. Thread: Teensy 3.2

    by Markk
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    Thanks everybody for the feedback. Can you...

    Thanks everybody for the feedback.



    Can you share your pad reduction parameters or are they a trade secret :-) ?

    Thanks,
    _Markk
  5. Hi duff this is quite fascinating. Looking...

    Hi duff

    this is quite fascinating. Looking forward to the scope pics. Many thanks!

    Just to be clear, from my perspective it's most important to fix idle() aka wait(). Personally I can live with...
  6. Thread: Teensy 3.2

    by Markk
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    Thanks veng1 That's exactly what I...

    Thanks veng1



    That's exactly what I thought. So on the second revision I pressed down quite hard. No change.



    I ordered with Seeed and its a 0.12mm stencil, so ~4.7 mil.
  7. Thread: Teensy 3.2

    by Markk
    Replies
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    Ah, I completely misunderstood! Now that I reread...

    Ah, I completely misunderstood! Now that I reread after a good night of sleep it was obvious. Apologies.

    Thanks for the tip about pressure because I obviously got it wrong, thinking I had not...
  8. Thread: Teensy 3.2

    by Markk
    Replies
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    Thanks for the answer but this is about using a...

    Thanks for the answer but this is about using a DIY reflow oven with a solder paste stencil. I would never finish my design with hand soldering ;-)

    5786

    I hope I'll soon find time to start...
  9. Thread: Teensy 3.2

    by Markk
    Replies
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    78,376

    Homemade reflow oven + QFN?

    Hi

    I know it's probably a bit OT to ask about this here but has anybody any experience with "homemade reflow oven" + QFN?

    I've successfully made a custom build Teensy 3.1 with various chips...
  10. Just a guess: could it be that Audio is enabling...

    Just a guess: could it be that Audio is enabling the DAC?

    According to the data sheet it consumes between 150 and 700uA.

    Snooze does not handle the DAC. The SIM_SCGC6_DAC0 control bit is...
  11. Oh I see. Nothing "automagical" there. Thanks. ...

    Oh I see. Nothing "automagical" there. Thanks.

    Just for clarification (more to myself): idle() aka wait() during either normal run mode or VLPR does not go through that code. So it's still valid...
  12. Thread: DMA Library?

    by Markk
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    Good to know, thank you. Will wrap my head around...

    Good to know, thank you. Will wrap my head around it ;-)

    _Markk
  13. Hi duff again thanks for the quick answers. I...

    Hi duff

    again thanks for the quick answers. I think you misunderstood my test results. Idle does NOT "mess up the Idle + millis" inside REDUCE_CPU_BLOCK if (and only if) you leave the systick...
  14. Systick should remain enabled!

    Hi duff

    I think the cpu has built-in support for maintaining a stable systick clock. I studied the reference manual which I don't really understand. There is this LPO output always at 1kHz (except...
  15. Thread: DMA Library?

    by Markk
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    How to release() a channel temporarily

    Hi Paul

    thanks for this great lib!

    Any particular reason, why release() is not public?

    If I understand the code correctly it already handles everything fine for repeated begin() and...
  16. Hi duff thanks for the fast reply. I...

    Hi duff

    thanks for the fast reply.



    I should clarify first: this is not about the absolute power values. I'm quite confident that your lib provides the correct savings (I'm looking at the...
  17. Continuous ADC+DMA in low power modes (Snooze) and/or different CPU frequencies

    Hi

    first a big thank-you to duff for the formidable Snooze lib!

    I'm playing around with continuous ADC+DMA in low power modes and/or with lowered CPU frequencies. Here are some insights and...
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    I had to sacrifice a third DMA channel to...

    I had to sacrifice a third DMA channel to reliably get rid of the lag. This will probably complicate DMA channel usage for other purposes down the road (there are only 4 triggered DMA channels in...
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    Went to the scope

    Just went to the scope. Doubled the caps to be sure. This is the typical scope output (dark blue is comparator output against the 2.2nF cap, bright blue is the Schmitt-triggered AND-gate's output)...
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    Here's a schematic: 5580 -Markk

    Here's a schematic:
    5580

    -Markk
  21. Replies
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    Hi Paul thanks for the elaborate feedback. In...

    Hi Paul

    thanks for the elaborate feedback. In my case it's a bit more complicated to add hysteresis.

    It's an integrator reset circuit. When the integrator hits bottom or ceiling it is supposed...
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    Thanks for the info. What I found out in the...

    Thanks for the info.

    What I found out in the meantime: the Teensy 3.x has the passive filter not enabled on the input pins by default. If I got it right, one would set/clear the filter like this:...
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    Minimum pulse width for interrupts

    Hi

    I'm using attachInterrupt() on pins. It works most of the time.

    However some pulses are lost.

    Because the phenomenon is associated with a related signal "acceleration" in the analog...
  24. Success!

    Just wanted to report that it works like a charm. Thanks to Xenoamor again!
  25. Sticky: Serial Number of Teensy 3.1

    Maybe add this right after the MAC entry:
    128-bit unique identification (ID) number per chip
    https://forum.pjrc.com/threads/25522-Serial-Number-of-Teensy-3-1?p=72175&viewfull=1#post72175

    For...
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    That's one reason I'm currently favoring the ...

    That's one reason I'm currently favoring the "half SPI.h + half native as the ILI9341_t3 lib does" approach "Using an #ifdef fest" to "get both, portability and speed, using a simplified ILI9341_t3...
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    Yes, I think I understand SPI Transactions...

    Yes, I think I understand SPI Transactions reasonably well and I know it's just an incremental consensus solution, not wanting to break the Arduino "way of life". It is clear that many problems can't...
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    Model citizen SPI device library - HOW?

    Hi

    I'm trying to find the right way to write a "model citizen" SPI device library, maybe even a reusable base class for such devices.

    Looking at diverse libraries I'm now a bit confused. These...
  29. Very nice! The K20 datasheet is really...

    Very nice!

    The K20 datasheet is really cryptic...


    I really believed only timers [and IO modules] can actually trigger them...

    Thank you guys.

    -Markk
  30. DMAChannel::triggerAtHardwareEvent digital pin source?

    Hi

    It's amazing how simple solutions have generally become with DMAChannel. Great work and thank you!

    Still I'm stuck here: I tried to find out if a digital pin input (edge) can trigger a DMA...
  31. Would be very nice to have in Teensyduino

    Something like that would be very nice to have in Teensyduino!

    _Markk
  32. Replies
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    Confirmation: it works!

    Just wanted to add one more confirmation that the Constantin Eagle lib worked very well for my custom build.

    Will post more about my project, once I got the time.

    Thanx again, Constantin!
    ...
  33. Replies
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    That's exactly what I tried, but stupid me forgot...

    That's exactly what I tried, but stupid me forgot to select the Teensy 3.1 board in the Arduino IDE. I usually work with Visual Micro for Arduino inside Visual Studio (where the spoofing worked...
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    Thank you very much for this explanation and...

    Thank you very much for this explanation and verification!

    Based on your inspiration I tried the following but I failed FAILED:

    1) Create a Wire directory in <sketchbook>/libraries:

    2 )...
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    I think this will not work, because the library...

    I think this will not work, because the library .cpp files are compiled independently without any influence from the sketch.
  36. Replies
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    Yes but it's not about my sketch, it's about the...

    Yes but it's not about my sketch, it's about the 3rd party library.

    For instance I use the Adafruit_INA219 lib and it's header Adafruit_INA219.h includes <Wire.h> (see the code there).

    So I...
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    Thanks for the quick reply! >Yes, you may...

    Thanks for the quick reply!

    >Yes, you may want to replace wire.h in these libraries with i2c_t3.h

    But if I change the 3rd party library I lose the update capability. If a new version is...
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    Spoofing to

    Hi

    thank you for this great library! I have a project where I use many i2c devices. So libraries by other people are involved. These typically #include <Wire.h>.

    Am I correct that there is no...
  39. I need more frequent wakeups that every 200ms. :(...

    I need more frequent wakeups that every 200ms. :(

    Paul, can you please confirm that when I connect the MINI54TAN reset testpoint to ground, it will

    a) not allow anyone to (accidently) reprogram...
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    Thanks a lot!

    Thanks a lot!
  41. Replies
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    Sounds promising.. however attachments do not...

    Sounds promising.. however attachments do not seem to work?

    -Markk
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    Thank you Constantin! I noticed your symbol...

    Thank you Constantin!

    I noticed your symbol has a different layout as compared to the schematic published by Paul here whereas kam42's is a match. Obviously I'd like to recreate Paul's schematic...
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    Hi I added the Teensy 3.1 MK20DX256VLH7 to...

    Hi

    I added the Teensy 3.1 MK20DX256VLH7 to the library, also adding the DAC0 pin 18 DAC/A14 as per https://www.pjrc.com/teensy/schematic.html.

    Thank you kam42!

    Paul, perhaps you could...
  44. Hi, the time_t is (by convention) simply the...

    Hi,

    the time_t is (by convention) simply the number of seconds, since January the first, 1970, UTC. As such you can calculate and compare these as you can with seconds.

    The Alarm library takes...
  45. Thank you, I will try to follow up on this...

    Thank you, I will try to follow up on this suggestions. The "common mode choke" seems to be exactly the creature that I need. Nice tip.

    -Markk
  46. I think I misused the term "ground loop". It was...

    I think I misused the term "ground loop". It was always RF and AC noise pickup that I was concerned about. Will have to learn much more about those terms, about ferrites, "chokes" etc. Thank you...
  47. Before I throw it over board I definitely need to...

    Before I throw it over board I definitely need to learn more about it. Is it possible to get the part number or spec?

    Thank you very much .. for everything!
    Markk
  48. Hello William thanks! I guess it's...

    Hello William

    thanks!



    I guess it's difficult to communicate. This is the "guidance" forum, so things are not yet all worked out and I can't show you finished schematics etc. Hen and egg....
  49. Anyone? Please?

    Anyone? Please?
  50. Unsure about analog ground / ground loop (GND and AGND)

    Hi

    thank you all for the great work!

    I'm trying to figure out the right way to use GND and AGND in a project. There is some info in another post, but I'm still unsure.

    I'm not formally...
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