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    VBAT needs to be connected - it is unclear from...

    VBAT needs to be connected - it is unclear from your schematic if it has power.
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    @WMXZ: Yes, correct.

    @WMXZ:

    Yes, correct.
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    does not matter much. more important is they are...

    does not matter much. more important is they are NP0
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    What did you pay for the shield? Got my T4...

    What did you pay for the shield?

    Got my T4 with ribbon today.. looks fantastic. The Raspberry heat sink I found still fits - great.
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    Yes, I've spent much more money for useless...

    Yes, I've spent much more money for useless things ... such is life. The 3.5 additional RAM is a bonus, for free. It was found by a user of this forum. Don't you like it?
    The 3.6 is faster, so, it's...
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    Yeah, it's all a matter of handling / care. ...

    Yeah, it's all a matter of handling / care.

    Look at it this way:

    If you want to blame hardware for your mistakes, or think it would be a problem with the hardware if you expose it to conditions...
  7. if he upgraded from an old version - shouldn't...

    if he upgraded from an old version - shouldn't the file be already there?
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    You could just offer a PDF with a third page for...

    You could just offer a PDF with a third page for xbar and flexio.

    The card looks great!
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    With the "new" variable size of ITCM DTCM my...

    With the "new" variable size of ITCM <-> DTCM my old imxrt-size is not correct anymore and needs a fix.

    There is an issue with line-endings too, and I tried colors. The Arduino-builder does...
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    It is a good idea to put all code that runs only...

    It is a good idea to put all code that runs only once or where speed does not matter in PROGMEM if you want as much free ram as possible.
    I'd check all libraries and their init-code, too.
    And now,...
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    The 3.6 is definitely not a good start. I would...

    The 3.6 is definitely not a good start. I would really choose something much simpler as first design. I don't want to discourage you, but I'm pretty sure that it won't work....

    Maybe it makes more...
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    I have some PSRAMs, but did not do much with...

    I have some PSRAMs, but did not do much with them, so far. I think that's one of the next things I'll do. Still not sure which pins to use for the (quad-) I/O..
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    perhaps add a function to reconfigure the cache...

    perhaps add a function to reconfigure the cache of ocram to "write-through" and "disabled"- it will be useful for debugging or help users to solve cache-issues.
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    Paul, I don't remember that I added this to the...

    Paul, I don't remember that I added this to the list. And I don't think that it was me :) But yes, it can be removed from the list.

    But - there was an (other) issue with PROGMEM - if code and...
  15. Sorry to say, but this thread is an attempt to...

    Sorry to say, but this thread is an attempt to spam, maybe later. The question is copied from here: https://stackoverflow.com/questions/27251754/teensy-to-imitate-a-usb-bulk-data-transfer/27443813
    ...
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    ... and it might help to reboot the PC.

    ... and it might help to reboot the PC.
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    Frank, i tried RFSIM99 instead (I tried elsie but...

    Frank, i tried RFSIM99 instead (I tried elsie but was not able to use it correctly) - and more important - the exact parts. You can see the parameters if you enter the inductor- partnumber in...
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    Hello, I'm about to make a circuit board for the...

    Hello, I'm about to make a circuit board for the SDR.
    During my research I discovered this preselector, which I like because it doesn't use relays, doesn't need adjustment, and only uses SMD...
  19. Serialx.end() does nothing if begin() was never...

    Serialx.end() does nothing if begin() was never called - so yes, please post a short example code!
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    Great, thanks :)

    Great, thanks :)
  21. Usually, this is a) a bad sd card (try a fresh...

    Usually, this is a) a bad sd card (try a fresh one or reformat with the official format utility) or b) a problem with the hardware- unreliable connections, or too long.
  22. Thread: String issue..

    by Frank B
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    Or just the linker file. Jim, can you post the...

    Or just the linker file. Jim, can you post the one for Adafruit Feather ?
    On the other hand, it's very weird to edit the linker file to fix a self-made bug... and why don't the use the flash for...
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    Depends.... :-) We don't know what you are...

    Depends....
    :-)

    We don't know what you are planning to do with your pins. There is no general "best" way. Esp. if you want high speeds, things can become difficult quickly.
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    A single byte is only 255 combinations.. this is...

    A single byte is only 255 combinations.. this is why all unique IDs are using more than one byte...
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    Java exceptions: I got these often in the last...

    Java exceptions:
    I got these often in the last days - with a program that does only (USB-)print a few lines at startup, and after that, nothing. The execptions occured when compling the new program....
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    Not sure if it is an issue, but every time after...

    Not sure if it is an issue, but every time after installing a new Teensyduino version, it switches to Teensy 3.6 as default, which is a bit confusing :)

    The USB updates work quite well.
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    As far as I know it is manufactured in the USA.

    As far as I know it is manufactured in the USA.
  28. The better way is to update the library...

    The better way is to update the library...
  29. As far as I know the USB protocol itself does CRC...

    As far as I know the USB protocol itself does CRC Checks. No need for a additional CRC, at least for the packets.
  30. for what??

    for what??
  31. just cut the trace.

    just cut the trace.
  32. Hm, that looks good (If the pins are soldered to...

    Hm, that looks good (If the pins are soldered to the Teensy, too)
    Is it reproducable? The first file works a while, the second distorted from beginning? If yes, may be an issue with the card , and...
  33. Often, this a bad or too long connection to the...

    Often, this a bad or too long connection to the Audioshield. Or you did not solder the pins.
    Can you post a photo?
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    For programming, and to start the new programm...

    For programming, and to start the new programm after that, a reset is needed.
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    Good news: I've ported the very complex...

    Good news:
    I've ported the very complex TeensyConvolutionSdr to Teensy4 - it uses all kinds of libraries and hardware - had NO problems. Uses 190KB ITCM, 250K DTCM - really a lot of code (>12K lines...
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    If you want to see the FlexRAM Mapping: ...

    If you want to see the FlexRAM Mapping:



    PROGMEM
    void flexRamInfo(void)
    {
    #if defined(__IMXRT1052__) || defined(__IMXRT1062__)
    int itcm = 0;
    int dtcm = 0;
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    was about to do a very similar aproach.. even...

    was about to do a very similar aproach.. even your lines

    _flexram_bank_config = 0xAAAAAAAA | ((1 << (_itcm_block_count * 2)) - 1);
    _itcm_block_count = (SIZEOF(.text) + 0x7FFE) >> 15; looked...
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    Tim, for the fixed 256k, 256k, 512k you can use...

    Tim,
    for the fixed 256k, 256k, 512k you can use this:


    void ResetHandler(void)
    {
    asm volatile("CPSID I");
    //SCB_MPU_CTRL = 0; // turn off MPU
    IOMUXC_GPR_GPR17 = 0xAAAAFFFF;
    ...
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    ...we can use a common linker file for all RAM...

    ...we can use a common linker file for all RAM configs :)


    MEMORY
    {
    ITCM (rwx): ORIGIN = 0x00000000, LENGTH = 512K
    DTCM (rwx): ORIGIN = 0x20000000, LENGTH = 512K
    RAM (rwx): ...
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    My fault was that 512KB are dedicated to OCRAM,...

    My fault was that 512KB are dedicated to OCRAM, so the RAM-BANK size is still 32KB.
    This works:
    noInterrupts();
    IOMUXC_GPR_GPR17 = 0xAAAAFFFF;
    IOMUXC_GPR_GPR16 |= (1<<2);
    interrupts();

    ...
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    @Paul, is it correct, that the size of a RAM Bank...

    @Paul, is it correct, that the size of a RAM Bank is 64KB on a 1062, and 32 KB on a 1052?
    So, doing this:

    noInterrupts();
    IOMUXC_GPR_GPR17 = 0x55AFFA55;
    IOMUXC_GPR_GPR16 |= (1<<2);...
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    Looks like i've managed to "brick" my T4B2. I...

    Looks like i've managed to "brick" my T4B2.
    I edited the imrtx1062.ld file to


    ITCM (rwx): ORIGIN = 0x00000000, LENGTH = 256K
    DTCM (rwx): ORIGIN = 0x20000000, LENGTH = 256K

    and...
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    that's not "a bit" it's equivalent to 27MHz....

    that's not "a bit"

    it's equivalent to 27MHz. How many UNOs are that? Assuming 8MHz/Uno, > 3 UNOs lost... Or do they use 16MHz? Dunno...

    Edit: yield has to become faster. way faster. and without...
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    @Paul, I have a very big application -...

    @Paul, I have a very big application - TeensyConvolutionSDR which needs more ITCM and more DTCM - any chance that you can inrease both? 256K for both would be fine, as a start..
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    @Kurt, the alternative is to not beeing able to...

    @Kurt, the alternative is to not beeing able to use alternate, higher (or lower) SPI frequencies. Is this wanted?

    @Paul: I do not intend to use CAN, and I have not a single board or chip to test...
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    @mjs: thanks :) any idea to make it more...

    @mjs: thanks :) any idea to make it more efficient?

    Thank you Tim.
    I'm not sure if it is useful for the RTC. It would, if there was a way to detect a "cold start" or fresh programming. I don't...
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    I've patched interrupt.c to allow...

    I've patched interrupt.c to allow attachInterrupt() with GPIO6..9
    Would be great if you test it? Any way to make it faster?
    https://github.com/PaulStoffregen/cores/pull/370
  48. Sometimes a reboot helps. In rare cases there...

    Sometimes a reboot helps. In rare cases there seem to be crashed tasks that block HID or serial.
  49. Yes, I have this issue, too. I2C is very noisy. I...

    Yes, I have this issue, too. I2C is very noisy. I tried to insert series resistors - did not help. Would like to know a solution for this issue, too...
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    Kurt, I get some warnings: ...

    Kurt, I get some warnings:


    C:\Users\Frank\Documents\Arduino\libraries\ILI9341_t3n\ILI9341_t3n.cpp: In member function 'void ILI9341_t3n::drawFontChar(unsigned int)':
    ...
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