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Type: Posts; User: LenShustek

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    I initially tried using the SPI module on the...

    I initially tried using the SPI module on the chip to read the MOSI data, and a single external shift register to simultaneously read the MISO data. But because of the FIFO queuing on the chip, it...
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    A worthy project. Let me know if you have...

    A worthy project. Let me know if you have questions about the SPI Sniffer. It's been two years, so I've forgotten a lot about it, but I'll try to help.
    These days I'd probably use a Teensy 3.5 or...
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    Yes, see...

    Yes, see https://github.com/LenShustek/RedLINK-Sniffer. Both the code and the hardware design are there.

    I abandoned my effort to decode the Honeywell RedLink wireless protocol, but the SPI...
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    For you old-timers who remember the mainframe...

    For you old-timers who remember the mainframe "Whetstone" (floating point) and "Dhrystone" (integer) benchmark programs, I ran a version of them on the Teensy 3.6. The results are:
    19 MOPS 64-bit...
  5. Well, synth_Playtune is ready for you to check...

    Well, synth_Playtune is ready for you to check out whenever you come up for air. We're all looking forward to a 180 Mhz Teensy!
  6. I didn't get any guidance from folks here, so I...

    I didn't get any guidance from folks here, so I chose the first option: duplicate all the functionality inside the new audio object.

    I've created a new audio synthesis object called synth_Playtune...
  7. The Audio Library is impressive! I'm surprised...

    The Audio Library is impressive! I'm surprised it's as fast as it is, given that it uses some floating point. In my MIDI music players for the 8-bit AVR-based Auduinos, I had to avoid floating point...
  8. I didn't know about the Teensy 3.5 & 3.6 project....

    I didn't know about the Teensy 3.5 & 3.6 project. I just backed it. And yes, I'll probably start playing with the audio library; it looks great.
  9. Guilty as charged. In particular, of being an...

    Guilty as charged. In particular, of being an old-timer. I've been writing computer programs for over 50 years, and I enjoy it as much now as the day I started.
  10. Playtune: MIDI to sample-based audio synthesis

    About five years ago I reimplemented, for Arduino, some code I had written 40 years ago for the then-new Intel 8008 microprocessor to play polyphonic music with square-wave generators....
  11. No need to. Even after removing the buffer with a...

    No need to. Even after removing the buffer with a hot-air rework station, the "raw" pin 17 (PTB1) is available on the side of the Teensy board. The output of the buffer is a separate pin on the end...
  12. Thanks for the quick reply! My application has...

    Thanks for the quick reply! My application has nothing to do with LEDs; that was just the simplest way I could demonstrate the problem that pin 17 doesn't survive as an input over a sleep delay. I'm...
  13. Snooze.deepSleep changes pin configuration for Teensy LC?

    Could going into Snooze.deepSleep be changing the configuration of some I/O pins? In particular it seems to be changing input pin 17 to an output.
    Try this program on a Teensy LC connected to...
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    low-current DC power meter

    My latest Teensy project is a standalone accumulating current meter using the TI INA219 "high side" current/power monitor chip. I built it to analyze and optimize the time-varying power utilization...
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    Two SPI modules on Teensy 3.1: NOT

    I'm building a high-speed SPI "Sniffer" and was excited to see in the MK20DX256VLH7 reference manual
    https://www.pjrc.com/teensy/K20P64M72SF1RM.pdf, section 3.9.3.1 on page 128, and elsewhere...
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