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  1. Replies
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    What is the resistance between VUSB and GND? ...

    What is the resistance between VUSB and GND? 3.3V and GND?

    Does the 3.6 work and not draw too much current when powered from the 3.3V input?
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    Did you look for pregnant caps? That's one...

    Did you look for pregnant caps? That's one fairly common component that can make mobos to fail, though before total failure, they usually exhibit random reboots for some period of time. At my...
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    It should be possible to add connections to extra...

    It should be possible to add connections to extra I/O pins.

    There are high density mezzanine connectors that can bring out 60+ pins in a small package -- there wouldn't be enough place for them...
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    What exactly do you need, or trying to...

    What exactly do you need, or trying to accomplish? For certain cases, you could just use some 3-to-8 or 4-to-16 multiplexers. A lot cheaper than the digio board you linked.
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    First, remember that temperature rating means...

    First, remember that temperature rating means that the manufacturer guarantees operation within that range, but the part may very well operate just fine outside that range. There are components with...
  6. Can you scope the i2c bus? How many devices do...

    Can you scope the i2c bus?

    How many devices do you have on the i2c bus? Are you using the Adafruit modules? Do all of them have pull-up resistors?
  7. You may want to use an external MRAM module, if...

    You may want to use an external MRAM module, if that's a viable option. MRAM is like EEPROM on steroids.
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    Good point. Should've read everything before...

    Good point. Should've read everything before posting. :p

    However, it's still possible to make it to work. Say, the upper 16 bits are NC and the lower 16 bits are all brought out, so 32 bit...
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    Yep, mostly the same thing, but I'd like to see...

    Yep, mostly the same thing, but I'd like to see one 16 bit port (addr) and one 8 bit port (data). If that's not doable, I could settle for two 8 pin ports. Or just one. :p

    Another thing I...
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    How many sensors do you have? Any more detail on...

    How many sensors do you have? Any more detail on them? Up to 8 can be connected to a single 8 bit wide port and could be read with a single read command that way. But whether that's optimal for...
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    There are quite a few different types of sensors...

    There are quite a few different types of sensors that can be read in a number of different ways. But given your question (lack of details, for one) I'm not sure if you did your homework before...
  12. Thread: PIT and DMA

    by floating.
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    Thanks, I got it now. Initially, I just looked...

    Thanks, I got it now. Initially, I just looked at the initialization code, not the comments. But after reading everything, including the errata, looks to me not using the PIT for DMA triggering is ...
  13. Thread: PIT and DMA

    by floating.
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    Sorry, forgot to mention that I'm using a Teensy...

    Sorry, forgot to mention that I'm using a Teensy 3.2, but I'll look in the K66 manual to see if I can find a comparable section in the K20 manual.

    I already looked at the intervaltimer source, but...
  14. Thread: PIT and DMA

    by floating.
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    PIT and DMA

    As per PIT documentation:
    37.1.2 Features
    The main features of this block are:
    Ability of timers to generate DMA trigger pulses
    Ability of timers to generate interrupts
    Maskable interrupts...
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    Removing power should reset everything not...

    Removing power should reset everything not written into flash or eeprom, and reprogramming your teensy should clear and rewrite whatever your had in flash.

    If this happens only on a single pin...
  16. Thread: DAC latency

    by floating.
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    Thanks. I did some approximate measurements...

    Thanks. I did some approximate measurements with a scope and got comparable results. It took about 660 ns for the output to start to change, and depending on he target level, it got within 10%...
  17. Thread: DAC latency

    by floating.
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    DAC latency

    Does anyone know the time it takes from a write to the DAC for the output to reflect that?

    This is the relevant code -- no DMA or anything fancy. The interrupt handler works fine, and I know that...
  18. Did you try the "47k - 68k resistor to ground at...

    Did you try the "47k - 68k resistor to ground at the 3.5mm mini-jack connector" ? (before the caps, between 2,3 and analog GND) If you worry that it will have some impact on the audio, you could...
  19. The 'second' starts 90 ns before indicated by the...

    The 'second' starts 90 ns before indicated by the rising edge of the 1 PPS signal, so if I want slot and bit timing precisely aligned, somehow I need to take that 90 ns into account.

    One...
  20. sub microsecond timing for GPS disciplined device

    I'm working on a project that receives a 1 PPS clock signal from a GPS module, and uses that to slot align data packets.

    However, the rising edge of the 1 PPS pulse has a 90 nanoseconds delay, and...
  21. Guess you may have found the root cause. Of...

    Guess you may have found the root cause. Of course that was in my 2nd post...

    While breadboards have their own issues, I always do everything on them first to iron out possible issues.
  22. Increase the series resistor and add a 47k - 68k...

    Increase the series resistor and add a 47k - 68k resistor to ground at the 3.5mm mini-jack connector. If you have a fast enough scope, try checking for reflections on the line, both with, and...
  23. What you see is a "Windows behavior" that has not...

    What you see is a "Windows behavior" that has not much to do with Arduino or Teensy. Information about the Teensys is stored in the registry, I believe.
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    Does anyone know the mapping between the various...

    Does anyone know the mapping between the various low power modes in the Snooze (sleep, deepsleep, hibernate) and the various low power modes (wait mode, very low power run mode, very low power wait...
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    The link I posted above has 8 through hole...

    The link I posted above has 8 through hole devices. For a single 7 segment display, you probably want either the SN74LS47N or the SN74LS247N from that list, both under $1.80 apiece.

    But there...
  26. Do you have a DC blocking cap?

    Do you have a DC blocking cap?
  27. Anything you put in will have some effect on the...

    Anything you put in will have some effect on the audio, it's just that the effect can be vastly different depending on what's added. The resistors are very useful when used in relatively high...
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    The simplest way is to use a 7 segment driver...

    The simplest way is to use a 7 segment driver chip between the Teensy and the 7 segment display module:...
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    You should be able to estimate your data usage,...

    You should be able to estimate your data usage, and as long as it is expected to be well below the memory limit, you should just use the native container sizes as-is.

    If you have lots of data than...
  30. If strings would make your life easier, then by...

    If strings would make your life easier, then by all means use them.

    If you want something that runs reliably for a long time, just don't do any dynamic memory allocation, either implicit or...
  31. Do you have a scope to show what's happening? ...

    Do you have a scope to show what's happening? That can be rather useful.

    Aside from the TVS, you can try ferrite beads (they are easily removable). You could also try adding a couple of...
  32. That would be "smoking" or "blowing", not...

    That would be "smoking" or "blowing", not "bricking".
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    Will look into creating a simple, pared down code...

    Will look into creating a simple, pared down code that exhibits the same issue. I also have another issue (probably programmer error :( ) that may need another set of eyes.
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    Yup... No, I do the inclusion explicitly. The...

    Yup...

    No, I do the inclusion explicitly. The additional files are in a "Module" directory, so I just have a few "#include Module\[some-name].cpp" in the .ino file. Works fine under 1.8.4... ...
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    Even 1.8.5 has some bug, too. My program would...

    Even 1.8.5 has some bug, too. My program would not build with 1.8.5, but it builds just fine with 1.8.4 and either 1.39, 1.40, or 1.41.
    That could be because I'm #including .cpp files, but still.
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    state machines

    I wonder what's the best way to implement state machines on the Teensy.

    I started with a switch statement that was initially around 100 - 150 lines or so. But due to additional requirements,...
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    There is one simple and easy solution: use a...

    There is one simple and easy solution: use a Teensy with 2 SPI buses (3.5/3.6) -- no buts, ifs, or maybes, and that approach requires a minimum amount of fairly trivial code change. (but possibly a...
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    If it's still being developed/maintained, you...

    If it's still being developed/maintained, you could always try a feature request....
  39. Many circuits specified to run on 5V will run...

    Many circuits specified to run on 5V will run just fine on 3.3V, so I'd say that would be first thing to try.

    If there are some that really need 5V for proper operation (electric motors, for...
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    Would it be possible just to mark certain posts...

    Would it be possible just to mark certain posts editable upon request?
  41. Mistakes are much more likely when you are...

    Mistakes are much more likely when you are inpatient and in a rush. And if you blow up your teensy that may hold you up much longer.

    The automotive environment is rather nasty electrically...
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    A good portion of 5V circuits will work just fine...

    A good portion of 5V circuits will work just fine on 3.3V nowadays. Not familiar with that host board, but it can work just fine on 3.3V with one exception: the PWR pin in the USB connector will...
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    You can program some calibration routine that...

    You can program some calibration routine that checks for max and min values during the first, say, 10 seconds after you plugged in your joystick, and subsequently use those as max and min values. ...
  44. In this case, once the PLL is locked, there is a...

    In this case, once the PLL is locked, there is a steady HIGH.

    To answer your note about pulsing, there is a transitionary period when there is some pulsing, but that's irrelevant to what I'm...
  45. weird digital input behavior with weak weak pull-down

    I'm seeing some strange behavior with digital input that I can't fully explain.

    I'm monitoring a PLL lock signal output of some chip using pin 22 on a T3.2. The lock signal is active high and the...
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    Hehehe, I just did this a couple of days ago for...

    Hehehe, I just did this a couple of days ago for a pin that measures a 12V power supply voltage.

    I used a high precision volt meter to measure the voltage input to the ADC pin, and then based on...
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    Memoryboard 4

    Got a couple of question about it:
    1. Is there a schematics for it? I looked on github, but only pictures and parts list.
    2. Is there a reason why Paul doesn't (or can't) sell at least the bare...
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    Try eBay: "35 results for PT8211"

    Try eBay: "35 results for PT8211"
  49. Looks to me P1 to P4 are connectors. Did you try...

    Looks to me P1 to P4 are connectors. Did you try disconnecting them?

    Your loop() is mostly composed of delay(), [busy wait] and there are better ways to wait.
    See:...
  50. Currently, the only pins we use are those on the...

    Currently, the only pins we use are those on the perimeter. We might incorporate the 4 through hole pins into the next rev, but I highly doubt we'll use the other bottom pins anytime soon.
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