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  1. Hey Mate, I did but it made the flickering...

    Hey Mate,

    I did but it made the flickering worse. I decided to go back to the original setup on 1 SPI Bus and got it working by allocating memory for each buffer manually.

    Thanks :)
  2. I've not tried to put both screens on separate...

    I've not tried to put both screens on separate SPI Busses.

    I have cleaned up the code to make it easier to read and have them on SPI0 and SPI1. As soon as the second screen is added the flicker...
  3. Another thought is I am using 10k pull ups on the...

    Another thought is I am using 10k pull ups on the CS lines. Could that value be causing a minor delay in switching between the 2 being updated?
  4. Both backlights are connected directly to the...

    Both backlights are connected directly to the external 3.3v. Maybe increasing the spi speed might pay dividends?
  5. Thanks Kurt. Both are powered by 3.3v on a...

    Thanks Kurt.

    Both are powered by 3.3v on a seperate power supply and the mcu is a 4.1, which has plenty of resources remaining. Does the SPI speed default to Max or is this something that can be...
  6. Oh and no compiler warnings or errors

    Oh and no compiler warnings or errors
  7. Sorry, No they aren't causing any issues. It's...

    Sorry, No they aren't causing any issues.
    It's when I update both screens in the loop it caused the fast flickering.


    tft_Track.updateScreen();
    tft_Func.updateScreen();

    This happens with...
  8. ILI9341_t3n and 2x Screens on SPI1 - Flashing

    Hey Everyone,

    I have 2x ili9341 screens running on SPI1 and it seems to be all well. My only issue so far is using the frame buffer. When I update both screens in the loop I end up with flashing....
  9. Hey Everyone, I have 2x screens running on...

    Hey Everyone,

    I have 2x screens running on SPI1 and it seems to be all well. My only issue so far is using the frame buffer. When I update both screens in the loop I end up with flashing. Is there...
  10. Thanks Guys! I'll do an experiment with the 2...

    Thanks Guys! I'll do an experiment with the 2 tomorrow.

    Is there anything you can suggest I read on DMA's and frame buffers? a little bit lost with that side of things.
  11. Hi Kurt, I'm looking at running 2x ILI9341...

    Hi Kurt,

    I'm looking at running 2x ILI9341 displays. One on SPI1 and SPI2 (SPI0 is used). Is there any issues with using the sdio pins for SPI2 or am I best to use the PSRAM Pins?
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    Hey Kurt, Thanks!, I had a bit of a silly...

    Hey Kurt,

    Thanks!, I had a bit of a silly error I've fixed on my end. Many Thanks :)
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    ER-TFTM032-3 - ILI9341 Issue

    Hey,

    I purchased 2x ER-TFTM032-3 3.2in TFT displays from Buydisplay. I have them configured as below.

    3.3v
    4Wire SPI
    NO Touchscreens
    FFC Cable

    I tested one the other day using the...
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    Thanks Mate, I'm looking at buying one but wanted...

    Thanks Mate, I'm looking at buying one but wanted to make sure I have conflicts on other busses.
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    Hey Guys, I might have missed it, but are we...

    Hey Guys,

    I might have missed it, but are we able to choose one of the secondary busses on the T4.x boards? If so is there a reference to how to?
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    Yup it was just a test to see if it worked the...

    Yup it was just a test to see if it worked the way I wanted. I have changed the pin colours and the 2 boxes next to it update with which pin correlates to which function and the description in detail...
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    Hey Guys, Coincidently I've been making my...

    Hey Guys,

    Coincidently I've been making my own using SVG and HTML.

    https://dylanbrianbenton.github.io/Teensy4.1Pinouts/

    It's only been started today so very much of a proof of concept to...
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    thanks mate, in regards to the ground loop,...

    thanks mate,

    in regards to the ground loop, would this be a consideration if there only 1 DC supply being used? with the VIN pin connecting to the VIN of the slave to power 5v and the gnd of both...
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    UART and Optosoloators

    Hey :)

    I'm putting the final touches on a MIDI controller and I have added provisions for powering another Teensy and having it communicate via UART.

    Currently I've just got 4 pins

    - 5v out...
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    External Power Source Wiring

    Sorry Guys,

    I know I've personally check this 100 times, but after i made a simple error on my last board i thought i'd check with fresh eyes.

    Schematic wise would this look correct? Wanting...
  21. Sorry and an added extra. if i have a slave which...

    Sorry and an added extra. if i have a slave which isn't being connected via USB am i able to connect its VIN to the 4.1's VIN and leech the 5v from that? I understand there would be a current limit...
  22. Daisy Chaining Teensy MCU's for future expansion

    Hey Guys,

    nearly finished the design for my MIDI USB DAW Controller. One thought I had was for future expansion Daisy Chaining teensys.

    What would be best way for acheiving this? I was...
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    Yeah, thats what i was using as my point of...

    Yeah, thats what i was using as my point of reference. I just saw that 38/39 were MISO1 and CS1 were in red and differed to what the symbol showed.

    Im using a daisy chain of 595 and 165s so i...
  24. Replies
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    Teensy 4.1 Pinout from BETA -> Production

    Hey Guys,

    I'm using Kicad to plan out something i've written on my t4.0 which will be migrated to the 4.1 when it arrives next week.

    I'm using this part symbol library below for my schematic....
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    ahhh yeah. to be honest i might just have the...

    ahhh yeah.

    to be honest i might just have the usb via a breakout that connects to a micro plug like before. :)
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    im using a 4.0, but I'm also willing to use the...

    im using a 4.0, but I'm also willing to use the 4.1 because of the extra IO for future use. I might go down that path as it seems more flexible. :)
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    oh sorry. Teensy 4.0 :) Yeah as I'm...

    oh sorry.

    Teensy 4.0 :)

    Yeah as I'm designing my PCB i thought routing ti directly would be easy enough rather than an external cable.
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    External USB for Data / Power

    Hey Guys,

    Are there any diagrams floating around out there that shows how to replace the current Data/power microusb via an external usb like this?
    ...
  29. oh and maybe one more question. If I were to...

    oh and maybe one more question. If I were to daisychain the 595's is the max current still 75ma or is it per chip?
  30. Hi mate! yes thank you :) Ive managed to get it...

    Hi mate! yes thank you :) Ive managed to get it working as I wanted. TBH all 8 work at once but to allow a little more current i think i'll run them between 2 of them. It'll allow them to be a little...
  31. oh thanks! Yes i think the internet is a help...

    oh thanks!

    Yes i think the internet is a help and a hindrance sometimes. I've seen SPI used with it so I thought that was the only option. There is a library im looking at and one of the examples...
  32. oh man, Im an idiot. I was using the 5v pin...

    oh man,

    Im an idiot. I was using the 5v pin thinking id need more current for everything earlier on, now ive released id be using 150ma total. Scope creep got me.

    I'll do it with the 3v to be...
  33. Thanks Mark, This was powered via usb, so no...

    Thanks Mark,

    This was powered via usb, so no external power source.

    Soooooo I messed up when frustrated and accidentally shorted the a 5v pin to pin 13, so my CLK pin is cooked. I will use the...
  34. thanks alot for your help. I think its an avenue...

    thanks alot for your help. I think its an avenue worth exploring, so ive just purchased a couple of 74hc595 and a bunch of resistors and LED's at the same current rating as the buttons. (Yet to buy...
  35. TPIC6B595 and 3.3v Logic for Midi button light indication

    Hi Everyone,

    First post here so sorry if this is a simple answer :)

    I am currently playing with a Teensy 4.0 and im looking to drive the LED's on a tactile button (Omron B3W-9000 Series)....
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