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Type: Posts; User: Eka

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    A new error message showed up just once today. It...

    A new error message showed up just once today. It is not in any of my other syslogs for the past few days. I have not been able to get it to repeat. It was printed out after the Teensy 3.6 was reset...
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    Real frustration... Removed ModemManager, no...

    Real frustration... Removed ModemManager, no change. Removed cups, no change, but now my syslog fills with a few hundred colord messages every time I plug in or remove a USB device. ??? Why did...
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    As far as I know it is a real Teensy 3.6. I ran...

    As far as I know it is a real Teensy 3.6. I ran across that message when tracing down the dtr/rts error message in the kernel dmesg output.
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    That pesky rts/cts error is where I'm at right...

    That pesky rts/cts error is where I'm at right now. I've been looking into how to disable modem control on the usb serial handling driver cdc_acm. Ideally with an option at module load. I don't know...
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    I'm also getting bit by this. Same error...

    I'm also getting bit by this. Same error messages. I must press the prog button for it to program the Teensy 3.6. System was loaded with Ubuntu 18.10 last December and kept up to date software wise....
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    I have multiple copies of the development...

    I have multiple copies of the development environment installed on my linux box by having them under different user IDs. I need to do that because I'm working with three radically different...
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    I've been debugging as CFS, farming, time and...

    I've been debugging as CFS, farming, time and thunderstorms have allowed. Some long tests got stopped by power outages.

    The halting of the serial IO is the same issue as in the Lockups with...
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    Lockups of the serial IO become more likely to...

    Lockups of the serial IO become more likely to happen when I use threads.delay() than when just using threads.yield(). I think a long interrupt happening at the right time can do it too, but I...
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    That is the absolute maximum allowable range for...

    That is the absolute maximum allowable range for voltages going into the input IO pin. This is important for circuits for protecting the IO pin from voltages outside that range, like in an ESD...
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    See post #16 in:...

    See post #16 in: https://forum.pjrc.com/threads/53800-Fastled-issue-on-Teensy-3-6

    Also see:
    Thread on the perils of unaligned word access across memory bank boundary:...
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    I looked into possible timing issues in FastLED...

    I looked into possible timing issues in FastLED as I waited for crashes.

    On a Teensy 3.6 does this need to be enabled for the hardware SPI, and disabled for bit banged SPI?

    in fastspi.h

    ...
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    Those are the ones that were added to my file...

    Those are the ones that were added to my file when I told the IDE I wanted to use the FastLED library. Yeah, I thought it was a bit much too.
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    I took some oscilloscope pictures last night....

    I took some oscilloscope pictures last night. Daytime shots had to many reflections, and the traces weren't visible for SCI1 images. SCI0 was on channel 1, and SCI1 on channel 2. Channel 2 doesn't...
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    I'm going to chock this down to a hardware issue...

    I'm going to chock this down to a hardware issue for SPI0. The broken pin on my driver chip was the VCC power one. That meant the incoming signal to the first APA102 wasn't very well formed. It...
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    Using library FastLED at version 3.1.8 in folder:...

    Using library FastLED at version 3.1.8 in folder: /home/pi/software/arduino/arduino-1.8.5/hardware/teensy/avr/libraries/FastLED

    Some extra variables and library calls remain, but heavily trimmed...
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    Code in this...

    Code in this https://forum.pjrc.com/threads/53008-Lockups-with-FastLED-amp-TeensyThreads thread, but tied into issues with TeensyThreads library lockups. In my current development code I moved the...
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    I guess I should mention that from my 12 AWG...

    I guess I should mention that from my 12 AWG supply wires, I have 100uF electrolytic capacitors and connections at the density of every 10 LEDs over to the +5V and ground on the strips on one...
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    Could be that or the infamous APA102 timing issue...

    Could be that or the infamous APA102 timing issue that means longer strips have to be run at slower data rates. Just slow this down DATA_RATE_MHZ(8) until it works reliably.

    I have a 20 Amp...
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    pin 14 is an alternate for SCK0 so is fine. The...

    pin 14 is an alternate for SCK0 so is fine. The card that comes with the 3.6 shows it and other alternates.

    I have a system setup with both MOSI0 on pin 11 & SCK0 on pin 14, and MOSI1 on pin 0 &...
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    I've only skimmed through this article at...

    I've only skimmed through this article at DigiKey. It is primarily on USB 3.1 power capabilities and implementing them with a USB-C connector, up to 20V at 5 Amps is possible. It just touches on the...
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    Use a powered USB hub so you don't blow the port...

    Use a powered USB hub so you don't blow the port on the PC if it isn't fixed.
  22. Thread: Repairing a WS2812

    by Eka
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    In order to get an idea what needs to be done,...

    In order to get an idea what needs to be done, I'd need a closeup of an LED to see what chip package type it is. That effects the best methods for removal. There are people over at the EEVblog forum...
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    The capacitors are there to absorb spikes...

    The capacitors are there to absorb spikes generated during switching on and off of gates, LEDs, etc. Also a big bulk capacitor will absorb the bigger spike when you turn the string off. I have 100uF...
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    Sorry, still no code that will run out of the...

    Sorry, still no code that will run out of the box. If you have questions about how the parts integrate in to the missing code and the variables I may have left out, ask. Because of my CFS, I don't...
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    I'm currently away from my development computer...

    I'm currently away from my development computer and the code which they are part of. So just some notes that elaborate on the interrupt routines and how they are tied into my code.

    As said, this...
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    This is the type of on/off I'd like to see. I...

    This is the type of on/off I'd like to see. I usually see it implemented as press to turn on. Short press to turn off by normal software control, long press to force off now. Yep, I remembered...
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    That sucks. I know ways around it, but they all...

    That sucks. I know ways around it, but they all make the PCB cost more, and I don't see that being done. I very likely wouldn't make the decision to add that much cost to the PCB.
  28. Thread: Repairing a WS2812

    by Eka
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    I'm no expert either, but I at least know many of...

    I'm no expert either, but I at least know many of the issues and were to look. Also soldering is so second nature to me and I don't think of how to do it. I've been doing it since I was 8.

    PS, buy...
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    The more I read on FlexIO and XBAR the more mushy...

    The more I read on FlexIO and XBAR the more mushy my brain gets, but they look very interesting. I already can see where they would provide low level hardware support for coordinated motion control...
  30. Thread: Repairing a WS2812

    by Eka
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    It's basic SMD rework, but the chip may be highly...

    It's basic SMD rework, but the chip may be highly water absorbent so it may need baking out first if hot air is used. Some of the suppliers also use low melting point plastics which means temperature...
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    I made a mistake on the number of columns. There...

    I made a mistake on the number of columns. There are 13, labeled S0 to S12. S is likely for scan.

    This keyboard uses a Toshiba 4044 CMOS R/S latch for it's capacitive sensor. ON semiconductor...
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    These are the interrupt service routines I use to...

    These are the interrupt service routines I use to quickly slew the Teensy RTC to the PPS from the GPS's PPS output, then gather the data for calculating fine grained rtc adjustments for various...
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    I have a small format keyboard I love that has...

    I have a small format keyboard I love that has the old large diameter DIN connector. After many years of use the keys still have excellent action because I changed the rubber membrane with small...
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    Thanks! Lots of good stuff linked to in that...

    Thanks! Lots of good stuff linked to in that thread. I must not have used the right search terms.
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    Teensy Specific #define and Their Use?

    I'm wondering what all the Teensy 3.X specific #defines are. I want to modify a few libraries that I use for multiple different development boards and processors, and not have to maintain multiple...
  36. My suggestion would be to back out the changes to...

    My suggestion would be to back out the changes to the FastLED library one by one until it works again. Edit: It may also be in any other library used that changed over that time period.

    I ran into...
  37. Thread: hardware failure

    by Eka
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    is any chip, resistor, etc on the pcb getting hot...

    is any chip, resistor, etc on the pcb getting hot to the touch?
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    When I solder wires to the pads, I use slightly...

    When I solder wires to the pads, I use slightly longer wires so the wires to the holes hopefully are the ones that take up any load, unless a specific wire is pulled.

    What I really think would be...
  39. You can also store data on a SD card and play it...

    You can also store data on a SD card and play it from there. Generally it will need to be raw data, not compressed. Unless it is a very simple and fast decompression to apply.
  40. Thread: Supercap for RTC?

    by Eka
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    I've only recently done it for a Teensy 3.6, but...

    I've only recently done it for a Teensy 3.6, but haven't tested how long it will maintain the RTC. I originally did it for a DS3231, and would get 4 to 7 days with temp corrections, and a bunch more...
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    OK, I now have 10 additional LEDs hooked up to IO...

    OK, I now have 10 additional LEDs hooked up to IO lines. Relax, I used a 74HC04 hex inverter chip to drive 6 of them, with only 4 driven directly by IO pins, and they are driven at under 2mA.

    I...
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    Lockups with FastLED & TeensyThreads

    I'm experiencing intermittent lockups on a Teensy 3.6 when using FastLED and TeensyThreads libraries together. Sometimes it will lockup nearly immediately, and other times it can take 15 to 20...
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