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Please share photos of how you connected everything. We can help much better when we can see your wiring.

I'm committed a fix on github. https://github.com/PaulStoffregen/cores/commit/49b46c208734b6426ad5ed2b8cc6874ecd59ce2e Why simply writing the correct value to CCM_CBCDR doesn't work at 24 MHz, but the...

Parsing the output shows this: BUGBUG @110: F_CPU=110000000 50ms delay:: 1010 us and 1 ms System Clock: 120000000 IPG Clock: 120000000 Semc Clock: 40000000 RTC Clock: 32768 USB1pll Clock: 480000000

UPDATE - second thread started HERE :: https://forum.pjrc.com/threads/58688-Teensy-4-0-Clock-speed-influences-delay-and-SPI

Small Edit to code above. NOTE: As noted elsewhere Compile at 24 MHz and it starts broken as well. Code change above gives proper and clearer output: if ( foo < 47 ) { Serial.printf("\n...

Using p#13 ClocksT4.zip Replace the ClocksT4.ino sketch with this. It does the changes as in the October Post - with clock data printed by @mjs513 and shows this when the counts are wrong on millis(): "...

This is a secondary thread - missed my attention - Original issue 18 October - details and samples to repro there : forum.pjrc.com/threads/58053-T4-set_arm_clock-and-micros() Problem is clock feeding millis()...

Thank you Pete. Envelope is certainly a good idea. I 'll try this and let you know.

Opps - missed the connection … and misread.

@loglow/Dan: 'same here as well' - "PCB Only" for the kits as nothing 'used'. ADD: 1 new Top Mount battery holder, And 1 { 2x5 short header and female socket set }

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 probably the right...

Same here as well

Looks like we're somehow not managing to switch back to the ARM PLL. Why, I have no idea (yet)....

Probably easier if I just post it here. Its pretty just an extract of code taken from the 1060 SDK. So its a mess if you dig into it.

Could you point me to that code, or post it here? I'm trying this and getting 24 MHz. I must be missing something... Serial.println("clock test"); uint32_t pll = CCM_ANALOG_PLL_ARM; // page 1154 int...

hi kurtE. I have done some of the suggestions you gave before. I have used a buffer circuit to drive Dynamixel AX-12 using teensy 4.0 with the following scheme. I use pin 0 as RX, pin 1 as TX and pin 2 as...

@PaulStoffregen Way back when we first started I wrote an app that displayed all clocks (one of my first endeavors with the T4). I decided to dust it off and run it to see what it dumped out: At 24Mhz its...

You are right about the 600Mhz. Even if we changed the clock speed in startup we never went down to 24 mhz. The funny thing about 24mhz is isn't that considered the clock for low-power mode. Know @manitou and I...

Thanks -- that works, but I agree it's quite twisted; I'll wait until I am really out of memory.

Same here as well

same here as well

Well, if you absolutely want to take a trip to the syntax crazy land: #define KEY(name__, ...) unsigned int pulse##name__=__VA_ARGS__;\ Key key##name__={#name__, pulse##name__} KEY(On,...

Thank you Paul! Allen

@longlow Probably good idea to fix the PCB. I haven't started assembling the board yet so would only need replacement PCBs.

Thanks @JarkkoL -- that's closer to what I was aiming for, but I was hoping (for clarity) to have it all on one line without having to invent new names for all the intermediate variables like pulseOn -- I'll have a...

Back then we were only really using 600 MHz speed, as I recall. I'm digging deeper into this issue. Starting to look like we might not actually be running at 24 MHz. Might really be 30 MHz. Very mysterious....

you could do something along the lines of: struct Key { char Name; unsigned int *Pulse; }; unsigned int pulseOn={9070,4480, 610,530, 600,530, 610,520, 600,530, 00}; Key keyOn = {"On", pulseOn};

Know you asked @defragster this but think it goes back further. Found a couple of posts in the beta thread that might be of interest:...

Sure, just built it without the DC power jack and 7805 voltage regulator. And of course do *not* cut the VUSB-VIN pads apart on your Teensy (or solder them back together if already cut apart) so your Teensy provides 5V...

I’ve been playing around with new and delete for creating variable wavetable arrays from an SD card for dynamic wavetable synthesis instead of being limited to what fits in flash memory. Caution definitely needs to be...

You can also use them with attachInterrupt(), because it's supported on all digital pins.

@defragster - Do you remember where this micros() code originated? I believe it was contributed near the end of the T4 beta (while my attention was focused on a ton of hardware & manufacturing issues).

I don't have a Teensy 2 - but set IDE 1.8.10 to Teensy 2 and did Verify of example BLINK - On WINDOWS - with TD 1.49 beta 2 - it compiles and all is installed to build - not sure if it shows anything different as info:...

didn't realize the redist was stripped. haven't used it in a while, guess now that you say that i do remember always having the setup in my home thanks!

Teensyduino uses the AVR toolchain within Arduino. It's located in {Arduino}/hardware/tools/avr. No system-provided toolchain in /usr/lib is ever used. Teensyduino never supports any (modified) copies of Arduino...

The click is caused when the sound level is abruptly dropped to zero. Instead of a mixer, try using an AudioEffectEnvelope with delay,attack,hold and decay all set to zero milliseconds. Set the sustain level to 1 and...

I should have been clearer. Is it possible to configure the M8Q via the I2C and is this a rather straight forward proces?

There is no easy way. Arrays in C++ are fixed length. You can create a C++ class, which isn't really an array at all, but tries to act like one with operator overloading syntax. Then code inside your class can use...

Today we use C++14, and probably will stay with it for at least another year. We're probably due for a toolchain upgrade "soon". But that's not going to happen while we're in the middle of so much activity on the...

Found this: gcc.gnu.org/projects/cxx-status.html#cxx17 As far as Teensy ggc version - this was just posted:

@MichaelMeissner - was this aimed at this thread? :: forum.pjrc.com/threads/58695-c-17

search the forum for ublox or m8q, there have been several threads, eg https://forum.pjrc.com/threads/46058-A-UBlox-GPS-Module-Primer-for-beginners/page5

@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 joints to...

welcome loglow

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 = {21,26,27}; //... const...

@mjs513 - We posted/edited at same time - See my updated comment above

Yeah. The analogbufferdma works no issue. The RingbufferDMA is the one that I can’t seem to get to work. Probably something simple .

Warning I have not done anything with the T4_ADC_ringBufferDMA sketch yet... Maybe I should make at least a partial fix to this one... I have/had my own example: Tr_ADC_DMA_RMS, which I extracted my own buffer...

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 here at desk.

Updated T4_ADC_Compare. Will retry the DMA one to see what is happening?

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 was released in...

Well lets start with this. The MahonyIMU.ino sketch uses the PRJC MahonyAHRS library. Do not believe this is the same as the one you download with library manager, just a guess here. However, the MahonyAHRS lib can...

I agree - all compare stuff is in there from what I can except for the example: T4_ADC_Compare: this line: value = adc->analogReadCmp(pin_cmp, 0); needs to change to value = adc->analogRead(pin_cmp, 0); EDIT: ...

The bool problem is above my pay grade, hopefully one of the language experts will chime in. Here's what I think. The compile error is occurring in .c files that reference the bool type. As I recall, C does not...

Thanks Michael - I appreciate your help! Allen

@mjs513 - Updated (\n) I did a quick check back to your WIP branch and as far as I can tell everything in master is up to date with changes there? Sounds good!

@KurtE Download and ran updated sketch - no issues. Compiled out of the box. Used ",datalog.csv" to create a csv. Configure ADC 1 and 2Press any key to run test If line starts with , -> CSV file, # -> binary...

Its a brand new Arduino install (today) 1.8.10 with latest Teensyduino. I was able to do the prop shield calibration Yes, I now see that the PropShield example in the Mahony library compiles . But now I get "Teensy...

I'm using Arduino 1.8.10 and Teensyduino 1.49b2. I can compile the PropShield example in the Mahony library and MahonyAHRS.h (installed with Teensyduino) does contain begin(). Which version of Arduino and TD are you...

This still seems to be a problem, with the latest Teensyduino installation. Frank

@mjs513, @defragster...- I updated the test program, to give option to output binary or CSV files. Also allows you to type in name of file... If first character of line is a , the file will output CSV. If first...

Looks like the bug is within the calculations done in micros(). It seems to be happening at 150 MHz and lower, but only badly enough at 24 MHz to mess up delay(). Here's a test case to easily see the problem. ...

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 uses the pin.

Tested just now. Looks like delay() is broken when running at 24 MHz. Seems to work fine at all the other speeds.

> use delay functions as simple delay as it changes based on CPU Speed For me, delay() is correct independent of CPU speed.

OK, I found that I was still using a default library in C: after turning on the verbose warnings. The library suggested renders this for the clock example now. It's not wavy now but the lines are obviously not...

I did use Adafruit_800x480. However, I don't believe I've tried that version of the library. I'll give a try. It's as if there is some sync issue when the display tries to draw about half way across.

@mjs513 - Yep I am hacking up my example sketch to allow it to either output CSV or raw... Would make it easier to look at...

With things like, this it would be beneficial if you might provide some additional information, Like pointers to the actual hardware you are using, and likewise library: Is it this one?...

Probably need to hack it up to write it as a CSV file, would be easier to the read the data from the file. The other possibility is that I started hacking up Bill G's code to read a binary file and the write a csv or...

@nominal animal - DMA examples - There is sort of an example for doing DMA with both ADCs that is part of the ADC library There are issues, with the ringBufferDMA as part of that project... I had my own code for...

Yep - Thanks, I forgot to put the close in... Yep - Currently a binary format, 2 bytes per sample. Obviously we could hack this up more to have something like a CSV file. Would add a little complexity of not...

Hi Chris, I also came across similar issue, In my case I am not able to use delay functions as simple delay as it changes based on CPU Speed.

Sorry for interrupting (pun not intended), but I recently verified the following approach works on Teensy 3.2. The ADCx is in software trigger mode. One DMA channel is used to transfer samples from ADCx_R0...