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  1. Thread: c++17

    by defragster
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    Found this: ...

    Found this: gcc.gnu.org/projects/cxx-status.html#cxx17


    As far as Teensy ggc version - this was just posted:
  2. @MichaelMeissner - was this aimed at this thread?...

    @MichaelMeissner - was this aimed at this thread? :: forum.pjrc.com/threads/58695-c-17
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    @DerekR: The stand offs - I got a set of four on...

    @DerekR: The stand offs - I got a set of four on quick count - they are for the four corner mount holes so when assembled it can sit on a bench/desk without forcing/inviting parts/pins or soldered...
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    Got logged CSV data files from...

    Got logged CSV data files from ...\ADCL_t4\Examples\T4_analogReadMultiIntervalTimer\T4_analogReadMultiIntervalTimer.ino with:


    const uint8_t ADC0_pins[] = {16,17,20};
    const uint8_t ADC1_pins[] =...
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    Looks promising! Will get to it shortly and...

    Looks promising! Will get to it shortly and double check. Was using laptop at TV so just happy to get the twin sets of three reading fast and not bother yet with the SD. Will double check the libs...
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    I got as far as updating libraries and putting...

    I got as far as updating libraries and putting this in the ADC_Lite example by KurtE:

    const uint8_t ADC0_pins[] = {16,17,20};
    const uint8_t ADC1_pins[] = {21,26,27};
    #define COUNT_PINS_PER_ADC ...
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    Glad you can see a way out - and have a note to...

    Glad you can see a way out - and have a note to avoid in future - good/painful lesson.


    Glad we had Derek's heads up trouble report to get a deeper look before any more parts got soldered away.
    ...
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    What //#include "SdFat.h" ?? Had to comment it...

    What //#include "SdFat.h" ??

    Had to comment it out - got the latest https://github.com/greiman/SdFat-beta and compile grief
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    Where is the latest tree?...

    Where is the latest tree? github.com/KurtE/ADCL_t4/tree/Comapre-WIP

    Any other needed changes for it to run work? Current CORES?
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    Thx, I'll look to set value out and read them in...

    Thx, I'll look to set value out and read them in groups with the 6 Analog/non-PWM {16,17,20,21, 26,27} pins and cycle value up and down when at some measurable freq with the ADCLite. If I read right...
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    Wasn't trying to justify bad behavior 'just...

    Wasn't trying to justify bad behavior 'just because' - only that as posted/tested it was erratic. ... TODO maybe came in handy?

    I can't say about other pins/cases - only tested the noted on the...
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    My comment on #395 notes that behavior now is...

    My comment on #395 notes that behavior now is that without 'some' change the behavior is problematic at best - there is a cusp where what would be expected to be HIGH value results in 'zero'. That...
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    Good info and plan - I stopped short of further...

    Good info and plan - I stopped short of further testing - hoping the fix will be evident to @loglow - but now would be the time to ring it all out. Never did the same for the initial beta board - but...
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    Just seeing if I paid enough attention to read...

    Just seeing if I paid enough attention to read the code right :) Maybe I'll get a chance to work with it.

    I'd say super … KISsS. If there are read not ready fails - mark them for spacing and...
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    Happy :) / Sad :( :: Glad I read the lines right...

    Happy :) / Sad :( :: Glad I read the lines right - so small. If @Loglow can confirm and correct easily it seems all in that cable.

    I started on the PCB and #36 does connect the two DAT pads and...
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    That looks clean and easy. Should the setup()...

    That looks clean and easy.

    Should the setup() of ///// ADC0 really look redundant with 4 commands issued twice to same object?

    In the 'not complete' case would it make sense to flag 'no value...
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    Kits Look Awesome - Based on Derek's note looking...

    Kits Look Awesome - Based on Derek's note looking before soldering ….

    Using DVM to ring out the Flex Cable:: CLK comes out on CMD? - then staring at it ...

    The PCB on connect end shows CLK...
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    As far as the GPL issue as Paul noted - "GPLv3...

    As far as the GPL issue as Paul noted - "GPLv3 which means none of it can be used directly in the MIT licensed Teensy Audio library"

    That is just saying that unless an alternative licensed library...
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    Multi channel at high rates isn't something I...

    Multi channel at high rates isn't something I recall as posted. It would take the person having done it or interested in working it out to login and see the post.

    It would take some special...
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    Best wishes for a long and happy T4 life on the...

    Best wishes for a long and happy T4 life on the new board.
  21. Good to hear!

    Good to hear!
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    @MM - instructions will be handy - there was a...

    @MM - instructions will be handy - there was a recent note about those close pins to battery holder needing trimmed/attended to in some fashion.

    Interesting - you guys got one already - USPS says...
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    which Teensy is in use might be important.

    which Teensy is in use might be important.
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    There is an active thread looking into T4's...

    There is an active thread looking into T4's analogRead() : pjrc.com/threads/58387-Teensy-4-0-which-pins-for-which-ADC

    That is a WIP you might try.
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    Cool - will have to give it a look.

    Cool - will have to give it a look.
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    Downloaded and installed TD 1.49b2 for some...

    Downloaded and installed TD 1.49b2 for some reason this time it gave this on first run - I did not pick "Run":
    18414
    Looked at properties and it offered 'UNBLOCK', I did not check that and re-ran...
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    re: post #27 above { fail at 24 and 150 MHz } -...

    re: post #27 above { fail at 24 and 150 MHz } - it may be a clock setting issue : pjrc.com/threads/58567-Teensyduino-1-49-Beta-1
    Resolved perhaps in TD 1.49 by release.
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    Follow up to post #27. There is a problem at 24...

    Follow up to post #27. There is a problem at 24 MHz startup speed switching from power up reset speed - this may explain failed SDIO on SDFat Beta code?

    EDIT UPDATE: Building at 150 MHz start...
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    Indeed it is likely a rare not 'generally' easy...

    Indeed it is likely a rare not 'generally' easy to hit problem - and easy to work around. In doing the work on MICROS() using the millis() + CycleCounter timing I never triggered it. If the clock...
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    Paul - this millis() issues on certain...

    Paul - this millis() issues on certain set_arm_clock transitions. See: pjrc.com/threads/58053-T4-set_arm_clock-and-micros()

    Title says micros() but that is because it tracks on millis() clocking.
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    Paul - TeensyDuino 1.49 fixable? Certain passes...

    Paul - TeensyDuino 1.49 fixable? Certain passes through set_arm_clock() with clock speed transition depending on current settings leave the clocking for millis() not properly set.

    Post #2 the...
  32. That isn't part of std WIRE lib it seems - so...

    That isn't part of std WIRE lib it seems - so adding may have complications.

    Looking at : \hardware\teensy\avr\libraries\i2c_t3 included in TD it does note non-blocking version details.

    For...
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    This came to mind:...

    This came to mind: github.com/ftrias/TeensyThreads/pull/21



    Also note :: This branch [ PaulStoffregen/TeensyThreads {Latest commit on Aug 22, 2017} ] is 19 commits behind ftrias:master.
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    I saw github CORES has first pass of T4 USB...

    I saw github CORES has first pass of T4 USB Keyboard checked in followed by mouse and joystick - likely out with Beta 2 when it is ready:


    Add USB keyboard for Teensy 4.0

    Add USB mouse &...
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    The T4 or T_3.6 SDIO interface to an SD card can...

    The T4 or T_3.6 SDIO interface to an SD card can write perhaps 10 MB per second - depending on the driver library used. Also 5-15 MB/sec writes to disk or flash drive are possible with USB Host...
  36. The info on the part in use would be needed to...

    The info on the part in use would be needed to give a complete answer.

    The ones used by PJRC are on the website and are a Electret Condenser Microphone. Unless the MEMS mic in use presents the...
  37. opps - that explains my thinking it wasn't...

    opps - that explains my thinking it wasn't compiling the right code - I saw the IMXRT file which was obvious - but ignored the WireKinetis file :(
  38. at a glance it looks like that should prevent the...

    at a glance it looks like that should prevent the compiler from saying that - assuming it is called with no (params)? - confirm in verbose console output it is building with the sources from that...
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    That sounds great Paul. Other simple test done...

    That sounds great Paul. Other simple test done here looked good and reliable - even if it was not built for speed - it was reliable. And as noted dumping some @luni_LATIN text quickly pushed to 10...
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    IDE 1.8.9 builds much faster AFAIK - 1.8.10 does...

    IDE 1.8.9 builds much faster AFAIK - 1.8.10 does mega rebuild on the tiniest change on Audio sketch.
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    I did use you inbuilt firmware upload - same...

    I did use you inbuilt firmware upload - same speed 4.86? Seems to go to Panic flash after 1 iteration with send of 0.02MB?

    It finds a single T4 nicely on hub or left front port - but not on right...
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    @luni - Nice. I took a quick look 'software' -...

    @luni - Nice. I took a quick look 'software' - 'firmware' - looks like usable files are there somewhere for both CPU's :) I grabbed the first line of the latin text 930+ bytes and threw that in the...
  43. Indeed, sounds like a Win issue - the few cmdline...

    Indeed, sounds like a Win issue - the few cmdline t_sermon dumps were garbage free output to file - it was good to see that finally.

    Security:: for sure some of the dumps of garbage could have...
  44. Indeed Win CMD output is slow - that is why I was...

    Indeed Win CMD output is slow - that is why I was doing the 1,000 batches before printing even one buffer. Though doing 10K batches did not run any faster - likely the minimal code overhead to clean...
  45. Doing this ::...

    Doing this :: T:\arduino_1.8.10\hardware\tools>teensy_serialmon.exe usb:0/140000/0/1 > seeme.txt

    The created file this way doesn't seem to show the printed corrupt messages in a couple of tries. ...
  46. Odd things noted above - using sketch with no...

    Odd things noted above - using sketch with no delays posted below.

    Not sure if any of this is T4 related - but all make at this this Win_10 PC an unreliable test bed::

    > I see garbage spew on...
  47. @Paul - modified prior PC app to read 512 bytes...

    @Paul - modified prior PC app to read 512 bytes in groups of 1,000 times - and sends each buffer back to the T4, but only prints the last buffer of the 1,000. One sign of trouble with that garbage...
  48. Indeed it is that thread. That post preceded the...

    Indeed it is that thread. That post preceded the notes on T4 memory pjrc.com/store/teensy40.html

    And above was right > what speed is RAM2 that it needs to be cached?
  49. There is a memory thread - search forum for...

    There is a memory thread - search forum for imxrt-size - details there may be helpful, also that exe imxrt-size will spit out info on what is allocated where at compile time. I posted an output of...
  50. OCRAM is all open in the TD 1.48 - for pending...

    OCRAM is all open in the TD 1.48 - for pending faster USB in TD 1.49 it looks like 12 KB is allocated to USB buffers for DMA access. When that is complete USB will be optional and turning it off...
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