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  1. Hi Paul, These chips were un-touched prior to me...

    Hi Paul,
    These chips were un-touched prior to me pulling them out of the box and soldering them to our boards. I've reworked 3 boards with parts from the latest batch you sent, and they all work.
    ...
  2. Issue has been resolved. The batch of MKL04...

    Issue has been resolved. The batch of MKL04 bootloaders we received had not been programmed. Paul overnighted us a new batch, I reworked the board, and we are working OK now.

    Thanks Paul!
  3. I'll recheck it, but I believe the answer is in...

    I'll recheck it, but I believe the answer is in my chart above. On the bad board, I measure about 0.2V on the Program pin (and it jumps around a bit like the pin is indeed floating.).
  4. I compared a good board (same revision) to our...

    I compared a good board (same revision) to our bad board. I measured the voltage of all the pins connected to the MK20DX256. I found bootloader pins 10 and 16 are identical, but the remaining pins...
  5. The integrated pullups in silicon are usually...

    The integrated pullups in silicon are usually pretty weak, so we include an external pullup in case we use the same Reset on lots of loads.

    One other clue I discovered: the Program signal should...
  6. Here's the schematic. Layout is likely not a...

    Here's the schematic. Layout is likely not a factor at this early stage of the game. Voltage rails are all in good shape.
    21669

    One other thing I should point out -- the USB connector is on a...
  7. Reset is not pulled low in response to Program

    Hi All,
    We are trying to debug a DIY Teensy 3.2 problem. We are using a MKL04Z32 bootloader chip, and MK20DX256VLH7 uC. After assembling all the components, I powered on the system and put a...
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    Paul, Here's the Verbose info. FWIW, the...

    Paul,
    Here's the Verbose info.
    FWIW, the board has behaved OK the first couple of times I tried re-programming it this morning. Maybe it needed the weekend off to recuperate? :) I'll continue...
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    Yes, I tried the LED blink example, as well as a...

    Yes, I tried the LED blink example, as well as a couple other files in the Teensyduino examples group. All uploaded OK, based on the Arduino response, but the microcontroller continued to run its...
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    Upload completes, but new program is not written

    Howdy all!
    I'm using a personally designed board, based on the Teensy 3.1 schematic. The board has undergone 30-40 successful SW uploads, and behaved well. Now, the board completes the upload, but...
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