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    Oh... STILL in alpha!? Many thanks for the link....

    Oh... STILL in alpha!? Many thanks for the link. Perhaps Paul would do well to migrate Teensy to PlatformIO and VSCode!
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    I’ve been pondering a move to PlatformIO and...

    I’ve been pondering a move to PlatformIO and VSCode, though I do like the plug and play nature of the current Arduino (despite the sh*tty editor)... but lockdown has meant all my projects are on hold...
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    I’m genuinely not surprised by this! Perhaps...

    I’m genuinely not surprised by this!

    Perhaps Paul should be on the phone to the RaspberryPi foundation, we might see a TeensyPi based on an M4 variant :)
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    We obviously don’t know the “arrangements” that...

    We obviously don’t know the “arrangements” that the RaspberryPi Foundation has with various organisations... but we do know that Eben Upton is a GPU designer at ARM, and they have VERY close links...
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    It is a custom ASIC, I expect that includes the...

    It is a custom ASIC, I expect that includes the fab set up costs too... I bet that the quoted cost is probably for the development of several chips too...
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    Good point, I’m particularly happy with the...

    Good point, I’m particularly happy with the Teensy USB support, another reason why I’m not giving up my Teensy 4 any time soon :-)
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    My gut feeling is that there will be a future...

    My gut feeling is that there will be a future RaspberryPi SBC which will have this chip uC integrated... possibly taking over the GPIO exposed on the board?
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    The RaspberryPi Pico has a few nice features: ...

    The RaspberryPi Pico has a few nice features:

    a) 2 cores (and an easy API to control them).
    b) Banked RAM, to allow parallel RAM access.
    c) PIO... I wish all microcontrollers had this.
    -edit-...
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    Really helpful, cheers!

    Really helpful, cheers!
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    There really needs to be a good tutorial about...

    There really needs to be a good tutorial about using the XBar and DMA on the T4
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    Thank you for this!

    Thank you for this!
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    This is fantastic! Hopefully it will spur more...

    This is fantastic! Hopefully it will spur more activity on the wiki!
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    Thanks for the link! I agree it seems sensible...

    Thanks for the link!

    I agree it seems sensible to use a community driven wiki to help improve the documentation rather than taking resources away from board/software development.
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    I think the scope of my project is too ambitious...

    I think the scope of my project is too ambitious at this time. It’s a real struggle to switch the IO fast enough to generate the pixel data, not to mention the DA conversion... I’ve looking into...
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    Are you able to link to the API document that...

    Are you able to link to the API document that covers all these awesome little features I don’t know about? ;)
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    Iím also keen to try and DMA to the GPIO, but I...

    Iím also keen to try and DMA to the GPIO, but I think the T4 digital I/O pins donít correspond to bits in a single register so can be written to with a single write. Iím not sure how useful DMA is...
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    No problem! Iím in the same situation. Teensy...

    No problem! Iím in the same situation.

    Teensy Timer Tool is really good already, thank you for your efforts. I look forward to any features you are able to add in future :)
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    I've avoided reading the technical documents...

    I've avoided reading the technical documents until you linked to them, as these modern uCs are so complex it would take me weeks to understand how their peripherals work... I'll try and work out what...
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    Regarding VGA output on the Teensy4.0... Iím...

    Regarding VGA output on the Teensy4.0... Iím reading the CPU manual, and the chip seems to have Video generation hardware built in to the chip already.

    Perhaps someone more knowledgeable with...
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    If Iíve understood the document Luni linked, PLL4...

    If Iíve understood the document Luni linked, PLL4 and PLL5 generate pretty much any frequency, but how to use them as a clock source for interrupt generation?
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    A slightly different question: Can we be more...

    A slightly different question:

    Can we be more flexible with the frequency of the clock source? That is to ask, do all the clocks need to be a multiple of the 24MHz master clock, or could I have a...
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    Excellent! Iím glad my tests have been useful. I...

    Excellent! Iím glad my tests have been useful. I will be focusing my attention on the OneShotTimer next as I am curious to see if that might suit my needs better :)
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    Ok, setting the prescaler to 0 for TMR in the...

    Ok, setting the prescaler to 0 for TMR in the defaultConfig.h file results in both the expected output and accuracy :)

    I know we are bound to the Arduino platform limitations, perhaps there is an...
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    I have put userConfig.h in the sketch folder,...

    I have put userConfig.h in the sketch folder, tried each prescaler value from 0 to 7... with a interval value of 0.636 (which should be a good value for a prescaler of 0)... all had no effect... I...
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    Ok, First Test for a 2us pulse: #include...

    Ok, First Test for a 2us pulse:


    #include "TeensyTimerTool.h"
    using namespace TeensyTimerTool;

    PeriodicTimer event(TMR1);

    int pin = 13;
    volatile int state = 0;
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    Ok, so I have a question. I want a periodic...

    Ok, so I have a question. I want a periodic interrupt around every 500ns... I have tried all the different timers and none seem to be suitable.

    I can post my code, but it is simple, it just...
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    Thank you, this was the missing piece of the...

    Thank you, this was the missing piece of the puzzle...
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    Hi KurtE, I have Arduino software installed and...

    Hi KurtE, I have Arduino software installed and running fine with my Teensy 4.0... It's the TeensyTimerTool I'm having difficulty with... where should I install the src files?
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    Maybe I'm missing something, is there an official...

    Maybe I'm missing something, is there an official way to install this on the Mac version of the Arduino software?
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    How did I miss this?! Iíll be testing this...

    How did I miss this?! Iíll be testing this tonight :D
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    If you have any free time have a read of this. ...

    If you have any free time have a read of this.

    http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node00AE.html

    The C64 and Amiga sprite systems are somewhat similar (though the...
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    It took a huge amount of work just to get it this...

    It took a huge amount of work just to get it this far... The Blitter is still missing a couple of modes, sprites arenít emulated at all (except sprite 0, which is emulated outside of the DMA...
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    You can find the source code here:...

    You can find the source code here: https://github.com/h5n1xp/Omega
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    Hi Frank, thanks for sharing this, defragster has...

    Hi Frank, thanks for sharing this, defragster has already pointed me to this thread.

    I love what you have done with integrating your C64 emu on the Teensy 3.6...

    As you can probably guess I...
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    How do we select a different clock source for the...

    How do we select a different clock source for the PIT?
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    Bit banging VGA output with Teensy 4.0

    I've finally managed to get something working, so I thought it would be a good idea to post my progress just in case it is of use to others.

    Theory
    The VGA display consists of 525 line of 800...
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    I dug out my OScope, looking at the signals it...

    I dug out my OScope, looking at the signals it seems Iím going to struggle to achieve even the graphical output of the ZX81 (64 by 48 black and white pixels) 😐
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    I phrased my reply poorly, I mean 24bits per...

    I phrased my reply poorly, I mean 24bits per pixel, 8bits per colour channel... the T3.6 VGA driver uses 2/3/3 bits per colour channel scheme, which would be far too limited for my project.


    ...
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    Many thanks for this, after much reading it seems...

    Many thanks for this, after much reading it seems I have been rather optimistic as to driving a VGA display with 8bits per pixel, directly from the GPIO... Perhaps the larger form factor T4 might...
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    I'm currently working on Bit Banging a VGA...

    I'm currently working on Bit Banging a VGA display using a T4, defragster has already helped me out with the timing to get nanosecond accuracy... But while digitalWriteFast() seems to operate within...
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    Hi mlu, I want to use your code in an open...

    Hi mlu,

    I want to use your code in an open source project (under the apache licence, if this is ok?), how do you want to be credited?
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    Perfect! Many thanks for providing this link, I...

    Perfect! Many thanks for providing this link, I need to run some tests to check itís good on a Teensy 4, but otherwise this is exactly what I need.
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    Hi defragster, I guess I could write my own...

    Hi defragster,

    I guess I could write my own elapsednano() fucntion, which would check if the counter is less than the previous read value and handles the delta accordingly... But that is more...
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    Is it possible to reset the ARM DWT Cycle counter...

    Is it possible to reset the ARM DWT Cycle counter after reading it, so you donít suffer an overflow?
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    ISA -> SPI adaptor

    Hi all,

    Has anyone used a Teeny 3.x GPIO to interface with an ISA bus?

    I want to be able to communicate with a RaspberryPI via SPI, but the only spare bus on the Amiga A1200 I want to use is...
  46. A more useful idea might be for the Teensy to...

    A more useful idea might be for the Teensy to identify itself as more than one type of USB device at the same time... not sure how possible that is though...
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    Hi Steve, sounds like you come from the Carl...

    Hi Steve, sounds like you come from the Carl Sassenrath school of RTOS design! I'd love to have a look :)
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    Looking forward to seeing this as standard in the...

    Looking forward to seeing this as standard in the Teensy 3.1 Audio library :-)

    Fantastic work!
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    Hi Eduardo, Let me know which part of the Mbed...

    Hi Eduardo,

    Let me know which part of the Mbed API you depend on and I will prioritise my free time to work on it. Right now, basic mbed stuff should be usable... I have already used it to assist...
  50. This is a good question, the USB keyboard...

    This is a good question, the USB keyboard emulation appears to be one way.
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