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  1. Thanks to you both, my good buddies.

    Thanks to you both, my good buddies.
  2. Does the Teensy 4.1 handle the PSRAM refresh time?

    I think the P means it's actually DRAM and so it needs to be refreshed. If this is true, what happens if I try to access data during this refresh time?

    Thanks.
  3. Thanks for the reply. I was using the...

    Thanks for the reply.



    I was using the default version and then I tried the GitHub version: https://github.com/mjs513/ILI9488_t3
  4. In ILI9488_t3.cpp, lines 84 and 85 are commented...

    In ILI9488_t3.cpp, lines 84 and 85 are commented out which prevent code compiling on Teensy 4.1 when trying to use DMA (updateScreenAsync):
    84: //DMASetting ILI9488_t3::_dmasettings[2];
    85:...
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    WMXZ, Thank you but I think the answer is to...

    WMXZ,

    Thank you but I think the answer is to do with a lack of extern.

    KurtE,

    Thanks for your support and patience. On my PC the code is all in a folder called sequencer and its USB type is...
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    Has anyone got any ideas?

    Has anyone got any ideas?
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    Defragster, I don't know either. I was hoping...

    Defragster, I don't know either. I was hoping somebody else would. The errors don't make any sense to me because the lines in functional and forwarddec.h to which are referenced look like they have...
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    It's in a folder called sequencer on my computer...

    It's in a folder called sequencer on my computer with a sequencer.ino file, now uploaded. The file that makes things go wrong is debug.cpp.
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    Thanks for the response. The build environmnet is...

    Thanks for the response. The build environmnet is just the Arduino IDE. That library structure is the contents of my sketch folder. I've added those files which I tried to upload in bulk earlier.
    ...
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    .cpp files not working as I expect

    Please explain .cpp files.

    I have been working on a large project without .cpp files because I was fine with the longer compilation times and I put most of my forward declarations in a single file...
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    Thanks for the response KurtE. It is a new...

    Thanks for the response KurtE.

    It is a new screen that I ordered. All the jumpers seems to be set correctly.

    I am just using AnalogWrite for the backlight. The old one worked like this so I...
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    Yes. It is this one:...

    Yes. It is this one: https://www.buydisplay.com/lcd-3-5-inch-320x480-tft-display-module-optl-touch-screen-w-breakout-board
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    Teensy 3.6 + ILI9488

    I had this working using the 2x20 connector but I am trying to use the FFC now with no luck.

    I am using the attached wiring. The only difference from normal is that CS and DC are reversed.

    I...
  14. Thanks for the response. I really don't think...

    Thanks for the response. I really don't think sale cost is a factor; PCB is cheap and adding more pins is just a matter of more traces. The initial cost of the time spent sorting it out is a good...
  15. Why does the Teensy 4.0 have fewer pins than the 3.6 and some othe stuff?

    Sorry if this has been asked before.

    It looks like the focus is more on using protocols etc. rather than messing about with pins directly, almost like a computer. This is like when we lost the...
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    Volatile and ISR

    I asked a question on Stack Overflow that mentioned using accessing volatile variables in an ISR and most said/implied that volatile was not required, which goes against everything I know. Admittedly...
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    Thank you. That seems to have fixed it.

    Thank you. That seems to have fixed it.
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    SD card openNext does not always work

    I have a micro SD card in a Teensy 3.6. When I use openNext, about half the time it only goes through the first four files but the rest of the time it works. I have not yet tried another SD card.
    ...
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