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  • jkoffman's Avatar
    09-27-2020, 05:29 PM
    I've never done this and I'm not really sure how MTC actually works at a low level. However, I can say that using this library you will be able to derive the incoming time code. I did a quick google search and there do...
    139 replies | 7859 view(s)
  • jkoffman's Avatar
    09-08-2020, 12:17 AM
    Ok, I'm a bit stymied here. Based on the official combinations in output_i2s_quad.cpp (7 and 32, 32 and 9, or 9 and 6) it would appear the the two output channels need to be consecutive. This may be why a value of...
    3 replies | 264 view(s)
  • jkoffman's Avatar
    09-07-2020, 09:49 PM
    Well, I finally had enough time to play with this! I started out by testing both hex and quad output with a simple sine wave object feeding them. That all worked well. Then I started hacking away... Sadly...it...
    3 replies | 264 view(s)
  • jkoffman's Avatar
    09-06-2020, 07:52 PM
    Ah, thank you very much Paul! So based on this I'm seeing 4ma? Am I reading that right? Thank you!
    3 replies | 269 view(s)
  • jkoffman's Avatar
    09-02-2020, 09:04 PM
    I'm running out of pins... Yes I could go to the Teensy 4.1, or I could use the backside pins on the T4.0, but I'd like to try solving this another way. So, some questions... On the ST7735 examples for the Teensy...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    09-02-2020, 08:22 PM
    Hi all, I can't seem to find a reliable answer for the current capability (source/sink) of the I/O pins on the Teensy 4.0. I thought that info would be in here: ...
    3 replies | 269 view(s)
  • jkoffman's Avatar
    09-01-2020, 02:11 AM
    Semi-related question - Kurt, am I able to use a different pin for D/C (other than pin 9)? I might need that for I2S audio... Thank you!
    13 replies | 365 view(s)
  • jkoffman's Avatar
    09-01-2020, 01:54 AM
    Just an update. I left one of the working displays for a couple days, and when I powered up my test setup today, it didn't work. I swapped to my other working display and...nothing again. I'm reasonably sure this might...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    09-01-2020, 01:46 AM
    Hi all, I'd love a double check on this. I've been spending a bit of time learning about I2S on the Teensy 4.0. I understand that there are a maximum of 5 pins can can do I2S. I'm looking at going for quad in/quad...
    3 replies | 264 view(s)
  • jkoffman's Avatar
    08-30-2020, 02:05 AM
    I'm starting to switch to VSCode with PlatformIO. Still early in the transition as I'm working on a few things and haven't had time to properly dive in. Agreed on the usefulness of the plotter. Seems like an...
    25 replies | 1028 view(s)
  • jkoffman's Avatar
    08-29-2020, 08:06 PM
    Great thought! I gave it a try but no dice. I couldn't get the actual LCD off the board, so I started closely inspecting the module. There appear to be 5 diodes (D1-5, you can see them in this photo:...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-29-2020, 04:22 PM
    Here's the latest! It looks like of the 5 modules I have, only 2 are working. When I started I must have grabbed a bad one, then when I grabbed another to double check, it was also bad. Luckily the 3rd I grabbed was...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-29-2020, 03:38 PM
    Hi Kurt, Yep, I moved to a Teensy 3.2 as I knew I had that exact setup working with an ST7735. So interestingly, I grabbed another LCD randomly from the pile, and this one worked. I'm working to characterize...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-29-2020, 03:16 PM
    Still plugging away at this. Haven't had time to solder up shorter wires, but I will hopefully do that soon. I did jump back a few steps to double check myself. I went back to a Teensy 3.2, and ran it with an existing...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-28-2020, 12:42 AM
    Thanks for trying it out, I appreciate it. I gave your version a try but still no love here. The only modification I made was to the reset pin definition. I'm going to rewire everything tomorrow in the hopes that my...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-27-2020, 07:23 PM
    Hi Kurt! Thanks for the confirmation that my pin choice was ok. I do have pin 0 connected to the reset pin, I also tried pin 1 just in case. I wasn't sure if there were limitations on the DC and CS combinations like...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-27-2020, 04:50 PM
    Hi all, I'm trying my first ST7789 based LCD (320x240) with a Teensy 4.0 and I'm having a bit of trouble getting it to work. This is a generic LCD, nothing fancy. So far I've been unable to get anything to appear on...
    13 replies | 365 view(s)
  • jkoffman's Avatar
    08-27-2020, 02:58 PM
    Ok, I have done some tests, and here are my results! Since I have the two Teensys connected to two computers, I left DEBUG defined on both so I could get the serial output. When running both with just serial, one of...
    25 replies | 1028 view(s)
  • jkoffman's Avatar
    08-27-2020, 01:27 AM
    Apologies for the delay, but I am back and sorting through things. I will try out that code as soon as I can. I'm hoping this eliminates the SPDIF hardware as the culprit and perhaps makes me focus more on the USB...
    25 replies | 1028 view(s)
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Audio Library for Linear Timecode (LTC)? 09-27-2020 05:29 PM
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