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    Thanks Frank, wasn't aware of that. Here a link...

    Thanks Frank, wasn't aware of that. Here a link if someone is interested in details: https://developer.arm.com/documentation/dui0040/d/ch05s04s03
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    Here you are:...

    Here you are: https://github.com/luni64/VisualTeensy/releases/tag/v1.4.0

    You can switch now between the standard newlib and newlib-nano in expert settings mode:

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    Yes, if all numbers are smaller than 11 the...

    Yes, if all numbers are smaller than 11 the second code is more efficient. For i > 11 the first one wins since the conditional expressions (those ending LS) are not executed. Anyway, my experience...
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    Yes, it is the same compiler and if you give it...

    Yes, it is the same compiler and if you give it the correct options it will generate the same code. Here https://godbolt.org/z/WT5jz7T1W with options for a T3.2 optimization level O2

    And this is...
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    I don't know how to calculate this magic number...

    I don't know how to calculate this magic number but the compiler does. It compiles both of your functions to more or less the same code including your magic number. These days it is difficult to...
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    I don't know much about Python, so an honest...

    I don't know much about Python, so an honest question: are you sure that this is not a python thing? E.g. in #1 I see this:



    data += packet


    I don't know how python handles such things...
  7. This will then also pull the resistors on the B...

    This will then also pull the resistors on the B side low not high right?
  8. Maybe I'm missing something but on your schematic...

    Maybe I'm missing something but on your schematic DIR doesn't seem to be connected. The /OE on pin 19 is only connected to the resistors and some other ICs. You write that the resistors are pull ups...
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    Thanks for the info. I think I'll add an option...

    Thanks for the info. I think I'll add an option for an easy switch between new-lib and nano-lib in VisualTeensy and see if I observe some disadvantages in the next months.
    Besides the impressive...
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    Here a measurement of the transferrate vs...

    Here a measurement of the transferrate vs Blocksize from 1000 Bytes up to 1E6 Bytes per transfer block for a total transfer size of some 10MB (10x10^6 Bytes). No transmit error detected.

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    I think I've got success working around (at...

    I think I've got success working around (at least) parts of the issue in Win10. It turned out that the data dropping only occurs if the teensy is sending freely into the Win10 host. As documented in...
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    I saw your reports about the printed stuff. It...

    I saw your reports about the printed stuff. It looks like some buffer overrun or something similar on the PC side. So this is certainly a bug. I'm just wondering if this (call it buffer overrun) is...
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    Hm, both Python and all the other shown tests use...

    Hm, both Python and all the other shown tests use the underlying Windows CDC driver (usbser.sys). So, it might definitely be something related to this driver. I ordered a STM32F746 evaluation board...
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    Interestingly, I did very similar tests in summer...

    Interestingly, I did very similar tests in summer (sending from Teensy to Win10 PC) and ended up with exactly the same result as described by ardvark. I was using the standard C# serial classes. I...
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    Using nano-lib instead of new-lib

    From time to time weird issues and workarounds pop up when using the STL with Teensies. Latest examples:


    68342-std-deque-Won-t-Compile-for-Teensy-3-x
    68366-std-string-causes-link-error
    ...
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    There is a weird linker issue which sometimes...

    There is a weird linker issue which sometimes doesn't link in _write (which is defined in print.cpp). You can work around this by placing a dummy Serial.println("") into startup. There are some posts...
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    E.g. foreach (var board in...

    E.g.


    foreach (var board in watcher.ConnectedTeensies.Where(t => t.Ports.Any())) //loop through all connected boards which expose at least one COM port
    { ...
  18. As Paul already mentioned, the price for...

    As Paul already mentioned, the price for abstracting an interface is that you need to stick to the smallest common denominator. RTTI would kind of help but is way too expensive for Microcontrollers....
  19. Edit: ups crosspost Here an example how to...

    Edit: ups crosspost



    Here an example how to do this:



    #include "Arduino.h"
    #include "FS.h"
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    Ok, I'll update the beta with the fix later...

    Ok, I'll update the beta with the fix later today. Have fun with VisualTeensy
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    Did you add the QNEthernet library to your lib...

    Did you add the QNEthernet library to your lib folder or to the shared library folder?

    Edit:
    You probably did, I can reproduce that when including the lib from the shared libraries repository
    ...
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    See here...

    See here https://forum.pjrc.com/threads/53604-Compiling-Teensy-Sketches-with-VisualCode-(Win10)?p=289285&viewfull=1#post289285
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    Problems compiling QNEthernet were reported here:...

    Problems compiling QNEthernet were reported here: https://forum.pjrc.com/threads/68066-New-lwIP-based-Ethernet-library-for-Teensy-4-1?p=289276&viewfull=1#post289276

    The reason for the issue is...
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    This library contains its own copy of the system...

    This library contains its own copy of the system file errno.h. For some reason the the core includes the library file instead of the correct system one. Probably some lookup order issue in the...
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    You find the info and link to the sources here:...

    You find the info and link to the sources here: https://github.com/luni64/TeensyTimerTool/wiki/Avoid-PWM-timer-clashes
  26. Just as a side note: Does changing line 242 in...

    Just as a side note:
    Does changing line 242 in time.cpp to


    getExternalTime getTimePtr = []{return (time_t) Teensy3Clock.get();}; // pointer to external sync function, default syncs to the...
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    Sorry, thought I mentioned it :-) Its in the...

    Sorry, thought I mentioned it :-)
    Its in the development branch of the Github repo. I.e. go to https://github.com/luni64/TeensySharp switch the branch from master to development and download it.
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    You might want to try this...

    You might want to try this https://github.com/luni64/TeensyStep4 (very experimental at the moment but should work somehow)

    The API changed significantly. Main difference is, that I disposed the...
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    Meanwhile I had a look at the library. Since it...

    Meanwhile I had a look at the library. Since it is not used very often I have to admit that it is not very well maintained. The main problem is, that it can not detect Serial Teensies with the new...
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    1.3Mb is quite large, but lets see... I'll be...

    1.3Mb is quite large, but lets see...
    I'll be traveling tomorrow but I can have a look on Thursday
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    Thanks for the input Kurt, but the 0x6000000...

    Thanks for the input Kurt, but the 0x6000000 issue was the first I stumbled over when I extended the code for the T4 :-) So that should work. Anyway, should be easy to fix as soon as the hex file is...
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    Can you post the hex file which shows the problem?

    Can you post the hex file which shows the problem?
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    Reserve returns false if it can't reserve. So...

    Reserve returns false if it can't reserve. So just check the return value...



    No, reserve uses malloc which can not throw....
  34. He, he, that's cool indeed. Thanks for checking. ...

    He, he, that's cool indeed. Thanks for checking.
    So, still the same conclusion right? If you want to check for out of memory condition use new(std::nothrow).
  35. I wouldn't call it a bug. Actually, I expected...

    I wouldn't call it a bug. Actually, I expected the crash since new is supposed to throw a bad_alloc exception which clashes with the fact that the sketch is compiled with -fno-exceptions (which is...
  36. Allocating memory with 'new', new(std::nothrow), testing -fcheck-new

    Triggered by this https://forum.pjrc.com/threads/68201-Is-using-a-quot-String-quot-still-a-bad-idea?p=288694&viewfull=1#post288694 I was doing a few experiments with detecting out of memory...
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    Yes this can be confusing. Maybe it is possible...

    Yes this can be confusing. Maybe it is possible to change the default behavior somehow? Need to goolgle this on a rainy Sunday afternoon...
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    I'm confused ?!? What do you expect that this...

    I'm confused ?!? What do you expect that this code should do? You are allocating memory in loop without ever releasing it and not checking if the allocation was successful. Since the Teensy doesn't...
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    . No deep deep thought behind that. I'm just used...

    . No deep deep thought behind that. I'm just used to pass structs by address into functions. Passing by reference would work the same of course. (and, probably the real reason: on a german keypboard...
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    As you also suspect, this sounds like an error...

    As you also suspect, this sounds like an error somewhere else. Just to exclude some unknowns, here a version which doesn't use the chrono clocks at all. It simply reads out the RTC, calculates...
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    There is a lot of template magic but AFAIK no...

    There is a lot of template magic but AFAIK no pointer magic. TimePoint::now simply returns a 'duration value' which consists of the value of the RTC counter (number of crystal periods) multiplied...
  42. That's definitely correct, thanks for spotting...

    That's definitely correct, thanks for spotting it. Without volatile, the compiler can assume that nothing was ever written to 'count' and could optimize the reading in 'println(count)' away. In this...
  43. You need to google for "lambda expression". They...

    You need to google for "lambda expression". They come in handy for such short functions and usually give the compiler more optimizing options (if you call a function through a function pointer the...
  44. I was interested if the T4 is able to count 10ns...

    I was interested if the T4 is able to count 10ns pulses. According to the measurements shown here: https://forum.pjrc.com/threads/57185-Teensy-4-0-Bitbang-FAST?p=212248&viewfull=1#post212248 a simple...
  45. Looks like you are interested in this stuff :-)...

    Looks like you are interested in this stuff :-) Here some code which utilizes the seldom used RTC interrupt to update it every second....
  46. That's true of course. The snippet defragster...

    That's true of course. The snippet defragster copied is from a software timer where this is called from yield() so this shouldn't be a problem (if the timer isn't ticked much faster the whole...
  47. Maybe I'm over cautious but one never knows what...

    Maybe I'm over cautious but one never knows what spikes are on such signals. I'd rather destroy a cheap buffer than the expensive controller.


    I'd simply count the pulses for a start. I don't...
  48. No, I'd stick with the step controllers, that...

    No, I'd stick with the step controllers, that ensures that you end up with the right position. Just precalc the speed of each motor that they reach their target at the same time.


    Yes, as soon...
  49. Sounds interesting indeed. Your detector...

    Sounds interesting indeed. Your detector generates 50ns pulses which should be long enough to trigger a pin interrupt. Voltage ranges also look OK. I'd consider to not directly connect the teensy to...
  50. Hm, that was not what I meant. I was interested...

    Hm, that was not what I meant. I was interested in a minimal example. Anyway, I extracted the info I needed from your huge sketch and did this:



    #include <TeensyStep.h> // library for...
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