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  1. As you can read in the MK20 data sheet and in the...

    As you can read in the MK20 data sheet and in the NXP ADC application notes, reliable ADC measurements with the integrated delta sigma converters require a source impedance lower than 10kOhm. For...
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    No, it was running on external power supply and...

    No, it was running on external power supply and the mouse pointer in the top left corner to prevent the power saver to kick in. I know how to do a software test setup.
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    After reanimating it by plugging the T3.2...

    After reanimating it by plugging the T3.2 (blinking in factory/hid mode) it ran until stalling again. Then, un-plugging and re-plugging the T3.2 makes no more effect, but un-plugging and re-plugging...
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    It definitively is. Running test here for several...

    It definitively is. Running test here for several hours.
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    Ok. Had to find an USB hub first... Restarted...

    Ok. Had to find an USB hub first... Restarted everything then, with the T4 connected through a passive USB-Hub and an USB-C adapter to the MacBook. Waited for the serial monitor stalling. Then...
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    Closing and re-opening the Serial Monitor shows...

    Closing and re-opening the Serial Monitor shows that the brave Teensy 4.0 continues working. But the serial monitor stalls in arbitrary intervals.
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    It did run for about 10 minutes until serial...

    It did run for about 10 minutes until serial output simply stopped without any error message in the Arduino console :
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    Arduino does not longer eat CPU (2%) but kernel remains on about 70% from...
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    Relaunched it. Keeping an eye on it and will tell...

    Relaunched it. Keeping an eye on it and will tell later.
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    I have (naturally) a Teensy 4.0 handy! :) USB...

    I have (naturally) a Teensy 4.0 handy! :)

    USB print speed test does between 240,000 and 248,000 lines per second. CPU usage is rather high :
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    Installs on macOS 10.15 Catalina beta 19A558d....

    Installs on macOS 10.15 Catalina beta 19A558d. Didn't compile the Blink example for T4.0 in a first attempt, got an error message telling that Arduino could not access the hardware directory which is...
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    Actually, as far as I can see, the current...

    Actually, as far as I can see, the current problem with macOS 10.15 (beta) is not with Teensyduino but with the Arduino IDE which actually doesn't compile for either CPU, be it Arduino, Teensy, or...
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    I’ve installed Arduino 1.8.9 in macOS Catalina...

    I’ve installed Arduino 1.8.9 in macOS Catalina beta, just as a container for installing Teensyduino.
    But for development, compiling and building, I use the Eclipse IDE with Jantje’s Sloeber Arduino...
  13. That’s also a possible “solution”, but why add...

    That’s also a possible “solution”, but why add two bulky 220uF capacitors if one can have a clean signal without these directly at the audio out pins?
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    Vs code + platform io does actually not run and...

    Vs code + platform io does actually not run and throws errors on macOS Catalina (beta). Several people have notified the issue for more than two weeks but nothing happened from developer side
  15. Yes, because the ground of the headphone output...

    Yes, because the ground of the headphone output is a virtual ground which has an offset of +1.65V. If you connect it to a “true” GND, these 1.65V will be shorted and the SGL5000 risks to be damaged.
  16. Ideally, a Note On or Off event would only happen...

    Ideally, a Note On or Off event would only happen at, or wait for the very moment when the amplitude value is zero, or at least very low. This is a technique called zero cross switching....
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    Doesn’t a cli version come with Koromix’ TyTools?

    Doesn’t a cli version come with Koromix’ TyTools?
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    If I remember correctly, the VL53L0X needs to be...

    If I remember correctly, the VL53L0X needs to be configured differently depending on the supply voltage (1.8, 3.3, or 5V). It might be that the Adafruit library does set the VL53 configuration hard...
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    It’s not forcibly about your specific IP address....

    It’s not forcibly about your specific IP address. Internet providers own normally a whole range of IP addresses. If the forum’s anti-spam protection sees too much spam from the same provider’s ip...
  20. I’d guess that the T4 core might run draining...

    I’d guess that the T4 core might run draining only a few milliamps when running @24MHz. But in that chip, there isn’t only the core but also a huge bunch of integrated peripherals which are partly...
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    Fortunately for PJRC, the first two small T4...

    Fortunately for PJRC, the first two small T4 production batches were rapidly sold out. A huge third batch is currently in the oven and this temporary shortage should be overcome in September.
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    The answer is no, at least for the Teensy 3.x....

    The answer is no, at least for the Teensy 3.x. The SPI transmit data register can hold a maximum of 16bit. But there is a configuration flag for continuous mode, so that you can transmit your 32bit...
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    On the PJRC website, in the data sheet section,...

    On the PJRC website, in the data sheet section, you may download the reference manuals for all processors from Teensy 2.0 up to 4.0. These reference manuals describe the inner life of the used CPUs,...
  24. First, I would check what kills your Teensys. Is...

    First, I would check what kills your Teensys. Is is for example the power supply or do you connect peripherals with unfitting voltage or current ratings?

    From my modest experience, fixing a Teensy...
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    Since this is a users help users forum,...

    Since this is a users help users forum, contributions are always welcome and appreciated. So, why don't you fork the ADC library from gitHub and extend it?
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    The iMX_RT_1064 reference manual with the missing...

    The iMX_RT_1064 reference manual with the missing registers and values for multi-channel SAI1 is here. (You need probably register at NXP to have access. That's free)

    The 5 data pins for SAI1 and...
  27. At least on the T 3.x, there was a historical...

    At least on the T 3.x, there was a historical lower limit for the analogWriteFrequency, caused by the bus clock (48 or 60MHz, depending on F_CPU), the maximum prescaler value (128), and the maximum...
  28. The basic difference is that the T3.x has a...

    The basic difference is that the T3.x has a different way of generating the I2S master clock: as seen in post #1, the single T3 I2S has its own fractional divider to generate the MCLK, while the...
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    Note : The iMX_RT_1060 reference manual has an...

    Note : The iMX_RT_1060 reference manual has an error in the audio section, the extended memory map and configuration for multi-channel I2S with SAI1 is missing. Please refer to the iMX_RT_1064...
  30. If I read correctly page 2068 of the reference...

    If I read correctly page 2068 of the reference manual, the MQS is an add-on block to the SAI-3 and the latter requires naturally an I2S configuration to serve the MQS.
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    It’s two built-in ADCs inside that mixed signal...

    It’s two built-in ADCs inside that mixed signal MCU. No extra chip. More info in the ADC chapter of the iMRXT1060 reference manual which you can find either on the NXP or PJRC websites.
  32. What I read in different threads is that the USB...

    What I read in different threads is that the USB serial of the Teensy is so quick that it can flood the Arduino Serial Monitor in a way that everything stalls... So, I‘d less worry about the Teensy‘s...
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    I found the cause for my non- or...

    I found the cause for my non- or mis-understanding. The reference manual does mention that SAI1 is multi channel capable but the documentation afterwards does not give any detail beyond the 1 single...
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    Thank you, Paul! I'll have obviously to dive...

    Thank you, Paul! I'll have obviously to dive deeper into the reference manual this weekend. 2 data pins on one I2S for quad channel audio output will be sufficient for my project. Inputs are not...
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    I'd also allow a question to continue thinking...

    I'd also allow a question to continue thinking (my current project does NOT use the audio library, working with 24bit audio @96kHz) before my T4 will arrive: On the T3.x there was 1 single I2S with 2...
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    Although I’m 55 years old and wearing progressive...

    Although I’m 55 years old and wearing progressive glasses, I’d give hand soldering a try. IMHO 1mm pitch can easily be hand soldered, if needed with a x2.5 magnifier lens which roughly “lifts” the...
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    Congratulations! A huge Thank You to Paul, the...

    Congratulations!

    A huge Thank You to Paul, the PJRC crew, and the beta testers/contributors!

    Unfortunately, I was (and I am still) "under water" with lots of other things going on and could...
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    Blocking of an IP address follows a violation of...

    Blocking of an IP address follows a violation of the forum rules, in 99% of cases spamming. In case of repeated spamming from IP addresses belonging to the same provider, all IPs of that provider...
  39. Sorry to say that, but to solve the main problem...

    Sorry to say that, but to solve the main problem (different channel amplification), you don't need a "usine à gaz". Go to the accessibility settings of the iPhone, scroll down to the hearing section...
  40. @Frank B: It looks to like most of the I2S...

    @Frank B: It looks to like most of the I2S fractional clock dividing in the audio lib is done based on F_CPU/F_PLL. Selecting F_BUS as the clock source and adapting the fractional divider defines in...
  41. The best guide for such things are 5 years of EE...

    The best guide for such things are 5 years of EE studies at a good technical university...
  42. The newer versions of the audio library do...

    The newer versions of the audio library do 32bit/slot which is 64bit/frame, but only in the 2ch version. The 4ch version is still doing 16bit/slot or 32bit/frame and waits for a kind and competent...
  43. USB serial is native in the Teensy, there is no...

    USB serial is native in the Teensy, there is no FTDI as on some old asthmatic Arduinos. So this is normally the more efficient way to go, at least when exchanging data with a PC.

    Reducing the 24V...
  44. Why not, for all the bells and whistles (LEDs,...

    Why not, for all the bells and whistles (LEDs, switches and potentiometers) go for a semi autonomous touch screen like the Nextion HMI?
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    The flash security byte is intended to prevent...

    The flash security byte is intended to prevent reading out the flash via JTAG, but as I said above, establishing a JTAG connection is not possible without additional microscopic soldering on the...
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    In any case

    In any case
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    Do people nowadays not longer study data sheets?...

    Do people nowadays not longer study data sheets? :)
    https://www.pjrc.com/teensy/KL26P64M48SF5.pdf

    Page 26 states clearly that the minimum for stable operation is 1.13V
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    No, the flash can't be read out via USB. One...

    No, the flash can't be read out via USB. One would need to fiddle with some small contacts on the PCB.
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    For making sure that USB flashing will work, you...

    For making sure that USB flashing will work, you should minimize the reset delay. If not, you’ll run in similar issues as with the capacitor.
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    The file name is mk20dx128.c

    The file name is mk20dx128.c
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