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  1. No it was meant to say that the ARM compiler is...

    No it was meant to say that the ARM compiler is older than the AVR compiler, and there might be things that the newer compiler provides by default. I do tend to agree that including stdbool.h is...
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    Same here as well

    Same here as well
  3. The ARM compiler shipped with Arduino 1.8.10 is...

    The ARM compiler shipped with Arduino 1.8.10 is version 5.4.1 which was released in June 2016. The AVR compiler is 7.3.0 which was released in January 2018. The current GCC compiler is 9.2.0 which...
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    You can use them as a normal digital pin. I.e....

    You can use them as a normal digital pin. I.e. use digitalWrite to make the pin go low or high, and digitalRead to read the status of the pin. As you said, there isn't anything specifically that...
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    Note, the tutorial listed was written in the time...

    Note, the tutorial listed was written in the time when Teensy 2.0/2.0++ were introduced. The LED pin that they mention for blinking the LED is now pin 13 (same on the Teensy 3.2, 3.5, 3.6, and 4.0)....
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    Fair enough. It was just in case it was the...

    Fair enough. It was just in case it was the first time you ordered from them, and expected overnight shipping.
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    Most PCB vendors that I've looked at prices for...

    Most PCB vendors that I've looked at prices for tend to include multiple boards in the price. OSHpark will show the number of boards if you click to order the board. If you live in the USA, if you...
  8. Great, glad it worked. :o BTW, the part about...

    Great, glad it worked. :o

    BTW, the part about favored pins is only for the drivers that try to get the most out the SPI performance, typically some of the display drivers and I think the ethernet...
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    Note, you do get 3 boards when you order from OSH...

    Note, you do get 3 boards when you order from OSH park. But obviously you would need to order the additional pieces (3 capacitors, 3.5mm connector, resistor, PT8211).
  10. No, I believe they are separate SPI buses. The...

    No, I believe they are separate SPI buses. The main pins for 3.5/3.6 are:

    Spi bus 0: MOSI0: 11 (alternate pins 7 or 28), MISO0: 12 (alternate pins 8 or 39), SCLK0: 13 (alternate pins 14 or 27),...
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    Yeah, unfortunately it is far enough under the...

    Yeah, unfortunately it is far enough under the steel case wall that I can't get to it, and I have problems getting back up if I crawl under the desk. So I ordered a replacement. And they come in a...
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    Teensy pins 24 and 25 are the hardware UART port...

    Teensy pins 24 and 25 are the hardware UART port Serial6 (pin 24 is TX6, pin 25 is RX6). From the schematic, teensy pin 26 is hooked up the ESP32 IO0 pin, teensy pin 28 is hooked up to the enable...
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    I just got the kit from Loglow/talldog. Thanks....

    I just got the kit from Loglow/talldog. Thanks.

    I suspect I may need to wait until the detailed instructions are done.

    I was playing around with the PCB, and I dropped the coin cell battery...
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    If we are going to update ST7735_T3 from mjs513's...

    If we are going to update ST7735_T3 from mjs513's new changes, would it be possible to add the two uncanny eyes examples that mjs513 had in his tree to the Teensy version? I believe KurtE, and...
  15. That will need an answer by somebody who is more...

    That will need an answer by somebody who is more hardware oriented. But I would imagine it might depend on what your input voltage/amps are. I.e. linear regulators might generate more heat...
  16. Note, you can power the Teensy through the 3.3v...

    Note, you can power the Teensy through the 3.3v ports. I might think feeding the power into a decent 3.3v step-down voltage regulator, and then powering both Teensys and the 3.3v devices from that...
  17. Well you might try calling beginTransaction and...

    Well you might try calling beginTransaction and endTransaction in your code to manually switch between the two.

    There are two separate SPI ports underneath the Teensy 4.0. For accessing a SD...
  18. You might try adding 2.2K pull-up resistors...

    You might try adding 2.2K pull-up resistors between each of the two CS pins. A pull-up resistor is connected in parallel between the pin and 3.3v. This comes from this page of how to make better...
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    Yes you can use regular 0.1" header pins. It may...

    Yes you can use regular 0.1" header pins. It may make sense to solder wires to a 3.5mm panel mount and use a standard stereo 3.5mm cable, such as:

    ...
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    It might depend on what you are trying to connect...

    It might depend on what you are trying to connect to the line out pins. Here is an extension cable that has the missing pin:

    https://www.newegg.com/p/2BX-001W-00005


    The pins are arranged...
  21. I believe this is the thread: ...

    I believe this is the thread:

    https://forum.pjrc.com/threads/57326-T4-0-Memory-trying-to-make-sense-of-the-different-regions?p=213324#post213324
  22. And you also can get into problems if you use an...

    And you also can get into problems if you use an unaligned pointer to load up multiple bytes. As I recall there are a few bytes in the Teensy 3.2 address range where doing an int load just does not...
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    Note, the original post is about the Teensy 3.2...

    Note, the original post is about the Teensy 3.2 and the audio shield SD card.

    I suspect that with either the built-in SD card or flash memory using SPI quad that it would be much faster. ...
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    I had signed up with NXP in order to get the 1062...

    I had signed up with NXP in order to get the 1062 datasheet before Paul made it available on PJRC.COM. I just got mail that NXP's buyout of Marvell is nearly complete (evidently it will be complete...
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    Unfortunately, the Teensy 4.0 does not have a...

    Unfortunately, the Teensy 4.0 does not have a reset pin. If the OTA uses the USB programming, then you could tie a pin to the program pin (or you could have whatever microprocessor is doing the USB...
  26. Well not everybody is comfortable with connecting...

    Well not everybody is comfortable with connecting such things. Like everything, there are always trade offs to be made. The more you go to smaller connections it can reduce the number of potential...
  27. If you aren't afraid of a little soldering (both...

    If you aren't afraid of a little soldering (both through hole and surface mount), you might want to check out this board designed by trainer4edu/frdm4236. Note for USB host, there will be extra pins...
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    Be sure to use a fast SD-HC card for your tests. ...

    Be sure to use a fast SD-HC card for your tests. Also format the card just before doing the test so the filesystem is not fragmented.

    I'm not sure whether the software or hardware support SD-XC...
  29. Note, the pinout for the audio shield is...

    Note, the pinout for the audio shield is completely different for the Teensy 4 than it is for the Teensy 3.x processors. Without doing a lot of rewiring between the audio board mounted separately...
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    I have the W25Q128JVSIQ (128 megabits, 16...

    I have the W25Q128JVSIQ (128 megabits, 16 megabytes), but I suspect there may be similar issues with other flash memory chips. But if you are soldering the chip on the audio board, you have to use...
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    I've tried before and I didn't get anywhere. I...

    I've tried before and I didn't get anywhere. I tried the Teensy 3.6 and it did not work. I also tried the Teensy 4.0 using the beta audio adapter that allows a T4 to use revision A/B/C audio...
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    It would be nice if you can pull in the fix for...

    It would be nice if you can pull in the fix for teensy4/imrxt.h and the WS2812Serial library from KurtE to get WS2812Serial to work on the Teensy 4.0:

    ...
  33. Paul, out of curiousity, have you settled on what...

    Paul, out of curiousity, have you settled on what pins you are bringing out, and the pinouts involved? Would you be bringing out the pins currently underneath the Teensy similar to the various...
  34. It is a shame that the loglow/talldog board...

    It is a shame that the loglow/talldog board hasn't progressed to retail sales at this point:

    https://forum.pjrc.com/threads/57122-Teensy-4-0-Breakout-Kit?p=211992&viewfull=1


    On some...
  35. Bear in mind names like TX/RX or DIN/DOUT can be...

    Bear in mind names like TX/RX or DIN/DOUT can be tricky as it depends on whether you are talking about the processor side (where TX/DOUT represent the output TO the device) or the device side (where...
  36. Well Paul would have to answer questions of the...

    Well Paul would have to answer questions of the design constraints of the audio shield. But in general, the audio shield's primary mission is to control and output audio data. Note, the original...
  37. Note, in terms of SD card writing, the built-in...

    Note, in terms of SD card writing, the built-in SC card reader/writer of the Teensy 3.5/3.6 will be much faster than the SD reader/writer on the audio shield. This is because the 3.5/3.6 built-in...
  38. As far as I know, the only way to connect it is...

    As far as I know, the only way to connect it is to connect it with a push button that when pushed, connects to ground (i.e. similar to how the reset or program buttons are in the 3.6).

    It isn't...
  39. Sigh, I have the worst luck with soldering. As I...

    Sigh, I have the worst luck with soldering. As I mentioned, I soldered the first board, trying to solder in stacking headers by having some space between the header and the board. It didn't go so...
  40. So what makes the Gravitech better than the other...

    So what makes the Gravitech better than the other stacking headers? From the mouser page, it looks like they only come in 8 and 6 pin headers, and were originally made for wire wrap? From the sizes...
  41. Oh, and I just tried the Sparkfun headers (2...

    Oh, and I just tried the Sparkfun headers (2 13-pin stacking headers + 1 7-pin stacking header), and I must say, I prefer having two 14-pin headers, and then using a normal 5 pin female header...
  42. One thought that I just had is perhaps an IDE...

    One thought that I just had is perhaps an IDE option that would build an executable image that includes the Teensy download module and the current ELF executable encoded in some fashion. This...
  43. I suspect the boot loader CPU does not have...

    I suspect the boot loader CPU does not have access to the SPI, serial, or I2C pins.

    For hackers with a single board, using a Pi Zero W (or Pi Zero if you don't need wifi) has been talked about in...
  44. New Adafruit stacking headers that will work with Teensy 3.2/4.0

    I noticed Adafruit recently added a set of stacking headers for their ItsyBitsy processors that use two rows of 14 pins with one row of 5 pins in the back. That seems like a familiar size. :cool: ...
  45. As I mentioned above, I had the same issue with...

    As I mentioned above, I had the same issue with pins 24-33 not being castlelatted. I put in another order after FRDM4236 redid the design to add some copper to make it easier to solder both sides,...
  46. If the scanner shows nothing and seems to hang,...

    If the scanner shows nothing and seems to hang, that is a sign you need pull-up resistors. Many I2C devices have pull-up resistors, as does the prop shield or audio shield. But not everything does,...
  47. In the Teensy 4.0 the direction and pin number is...

    In the Teensy 4.0 the direction and pin number is fixed. I.e. you have to use pin 0 for input and pin 1 for output. In the Teensy 3.x systems, there are additional pins that can be used, but these...
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    And this might be an even cheaper build. It is...

    And this might be an even cheaper build. It is basically a microphone and a cheap 8x8 i2c display with 2 colors. Note this was written for an Arduino, but it should carry over to the Teensy. The...
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    Yes it goes to the display, but it shows how to...

    Yes it goes to the display, but it shows how to get the input. You would have to change the display part completely to do LEDs instead of a screen.


    Well yes and no. It is mostly for processing...
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    Look at the Audio -> Analysis ->...

    Look at the Audio -> Analysis -> WaterFallSpectrum example.

    If you go to minute 17:36 of the video (through about 19:12), you will see it in use:

    ...
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