WMXZ
Senior Member

can you not create a new thread?

As I'm one of the people Paul is most likely referring to. What you see on a scope is broadband noise. However, if you look to a spectrogram you can see tonal that are not easily seen on broad band time series. Sure,...

You may look into https://github.com/WMXZ-EU/test_sgtl5000 above 240 kHz there is some degradation

Easiest is to add at top of file "#include "Arduino.h" " because that what Arduino precompiler does also.

Seems to work. At least Teensy talks to PC using flying wires and can download (the main reason for functionality)

No, I have a very tight space (not large enough for a USB connector) so USB data dots are connected to a PCB connector that is connected to a Underwater Bulkhead etc. All in a water tight pressure housing. An...

I used one of these extenders, Bill is talking about, to try sdio-access to multiple microSD. while the extenders worked fine, my attempts to have multiple SD cards on the sdio bus failed. only one card was responding...

make the math: 8MB in 50 ms is 160 MB/s or 1.28GBit/s.

No. See the schematic. If you plug in USB and can measure 5V on Vin, the bridge is NOT cut. inspect with magnifying glass.

@mborgerson the endpoint definition are somewhat modelled after the other devices. Anyhow, T3 and T4 have different USB implementations therefore there will be different descriptors. There was some years ago a...

what type of errors? did you follow the instructions on the readme file? what USB-type did you choose?

If you stick with microSD cards (as I do it) the actual MTP_t4 https://github.com/WMXZ-EU/MTP_t4 is a reasonable solution. Obviously feel free to follow the MTP responder thread or wait until Paul includes MTP to...

Please note that there is no garbage collection on Teensy, so malloc/free combo may create problems in the long run.

I'm using SDFat as supplied via Teensyduino, which has in ExFatConfig.h as default "#define USE_EXFAT_UNICODE_NAMES 0 " It works for me and I'm sorry for non-latin charactersets. However, if someone develops the code...

Increase AudioMemory. 2 is too few. try different values. if thy start with 50 you can use AudioMemoryUsageMax() to learn what is the minimum value you have to set (defined in cores: AudioStream.h) Also, push at least...

I have a T4.1 with a custom daughter board (having 6 spi uSD cards) : total 7 disks Originally I wanted to use only sdio bus, but unfortunately the uSD cards to not implement the sdio addressing system (similar to i2c)...

SW was developed for T3.6. porting to T4.1 is possible but requires some low level adjustments (as indicated by the compile errors you indicated)

No, also as my application calls in general for all slots populated with SD cards. However, could add the test on Data3 to void sdfs.begin to tell me that it failed.

Did you restart Arduino before recompiling to clean-up cache?

I wanted to share an observation T4.1 with Win10 I typically have 6 SD cards attached to my T4.1 (with sdio) observation: MTP may fail to work (shows only sdio, with no files in it), when I populate only a part of...

Reason is, that index list assumes that for N storages, the first N indices indicate the N root devices and have itself as parent. So if storage is added at a later time, a reset is required. Assuming this is working, a...

the symbol is defined in cores/teensy(3/4)/FS.h can you check its existence, or if you have a second FS.h on your system? maybe in "SD-Juse_Use_SfFat"?

It will be hard to get ALL spectral values printed in REAL TIME to serial terminal. To start I would only printout 1 to 10 spectra per second and throw the others away.

You cannot program Teensy via USB host pins. To use USB host pins as USB device (e.e. for Seria, MIDI etc) you have to write your own USB device SW for USB2 (the one accessible via USB host pins) To use access...

and use SD.begin(BUILTIN_SDCARD);

IMHO, you will never get a realistic performance picture without a solid soldered setup (best is pcb or veroboard) Then measurements should be made in a tin-box to shield electric fields that couple into wires. A...

As I said before, I did not know that they are NOR and not NAND. (mea culpa, mea culpa, mea massima culpa) Feel free to change them to NOR

I was using this when I tried a minimalistic teensy application.

#SD.h in latest TD is using SdFat v2

What does the MTP debug log say? is the PC restarting MTP initialization? Teensy may reboot too fast for MTP initiator to react, I don't know. Anyhow MTP works fine for me, so I have no urgent need for changes.

That seems a PC MTP-initiator problem (not to act on reset event)

AFAIK, Paul has some design rules on interfaces and endpoint numbers, so simply changing some numbers may not work.

Yes, until Paul assigns a unique PID to "MTP Serial"

For the mods, it is not important where you insert the text For example, I insert all "insert to boards.txt " in the beginning, and all "insert to usb_desc.h" just before the closing "#endif"

For the record https://audioxpress.com/assets/upload/files/colin2993.pdf

And it seems that https://shop.micross.com/ sells these good old stuff online (e.g. DPAD protection diodes) Worthwhile to see http://www.linearsystems.com/lsdata/others/LSK389_App_Note.pdf Anyhow, I'm happy to...

The name does not matter, I choose these ignoring what the chips really are. They are only to give a name to MTP storage.

believe you, but as datasheet says 10nV, would you mind to describe your measurement setup that resulted in 1.5 nV.

However J309 is 10nV/sqrt(Hz) not to be compared with LSK170

but TDOA still works, but otherwise you are right.

It says spectral level. Forgive Urick (most likely source) that he does not stick to scientific correct notation

can you source these JFETs? esp.LSK170, LSK489. OK, J309 on Mouser is 4,60 Euro.

Q: are you planning to process the array coherently? (75 cm = lambda/2 @ 1kHz)

@MM, I do not use Linux, but when a colleague of mine used my system (early T3.6 version) on Linux (embedded Ubuntu derivative) and I was looking over his shoulders, the mount command was different, and there was also...

The 5.1 nV/sqrt(Hz) voltage noise is acceptable for most LF application. Obviously, the good old time with sub-nV/sqrt(Hz) FETs are gone. Also, one may need protection diodes on the input, so that a dropping hydrophone...

wanted to say 0.1 to 1 uF

As we go into competition, Here are the specs of my acquisition system (somehow defining upper performance limit) 6 channels - 96 kHz - 32 bits - 15 MB data buffer: (SPI disk limit due to possible buffer overrun (uSD...

Is your desired sampling only 5 kHz? OK, I note, you are not using an ISR for each channel, but one ISR for all channels, and sample the channels sequentially in the Timer-driven ISR. If you stick with this...

I know there are some users on this forum with experience using hydrophones, so I would comment only on TDOA (BTW, I would TDOA not call beamforming, but this is not relevant) In order to do TDOA, you need to sample...

Agree with that

You best start with one of the standard examples in SD (using now SdFatV2) to understand the procedure. consequently you adapt to your own requirements (sampling frequency, # of channels) using 5 channels, you may...

so serializing it upfront would give you 750MBit/s. that does not fit your Clock speed. serializing it in Teensy does not change the situation. Even if you pass directly onto microSD you would need a microSD click...

does (total - used) not give you the desired result? Sure, if used is not updated when files are added or removed, it is only useful in the beginning.

visualteensy https://github.com/luni64/VisualTeensy

I assume you already have some code that implements the Manchester (de)encoding needed for the UNI/O ?

Teensy does not know if 5V on USB is from PC or from powerbank. VUSB and Vin go to LDO that generates 3.3V for Teensy. if VUSB-Vin is cut, ONLY Vin is providing power to Teensy, so Vin must be always provided. If...

So I tried to compile code ledPin not declared #define ledPin 13 should help

you can start with https://github.com/WMXZ-EU/USB2 which is made for T3.6 but used T4 as starting point

AFAIK USB serial does not support fixed baud rate it always goes with max speed. suggest to follow Paul's suggestion and to use real HWSerial, where you must set speed

The schematic is on the website and if you wanted to duplicate T4.x, why not buying it directly from PJRC?

I suggest to block all 'hate' speech on this forum

com'on, there are multiple posts and threads about this!

You can easily ignore lack of USB connection Yes, it fills-up a buffer, but when this buffer is full all further data are dropped. You can see that by writing data to USB, disconnecting USB from PC and after some time...

the constant is a float (single and not double)

see post #2 now you have to remove the -6.0f (6db is equivalent to a amplitude factor of 2)

because of factor 2

You always can use SDIO protocol (even if nobody has done so far AFAIK)

This is partially done in Serial, but I agree that checking for open session is a good idea, especially as PC will time out MTP when session is not established for some time (have not established timeout value, but...

In MTP I'm using extern volatile uint8_t usb_configuration; to know if usb is configured (taken from other devices) it is 0 when not initialized

I'm afraid that I have no experience with midi, but I can tell you that the 2nd usb was modelled after T4 so T4 midi would be a good starting point. But if you wanted to take on the challenge, I suggest to first get...

https://github.com/WMXZ-EU/USB2 I did it for T3.6 but have not ported this functionality to T4 (too busy with priority job)

can or must?

which teensyduino?

have a look onto schematic: VBAT-pin and 3.3V are combined with diodes to go to Teensy

I tend to disagree what-ever system is pre-loaded, you will find people that complain or want something else. I like the idea of having only the blink preloaded to prove functionality of a new system. if users are...

I only wanted to clarify the "d - first dump list of storages" option this prints out the relevant info of the index file, mtp uses to access the files. It is only useful during development and requires understanding...

One application of MTP is to transfer files, while the Teensy is not accessible, so disk access should IMO be optimised. If this can be done using info from filesystem, so better. Yes, FS.h should provide basic...

Well, I only adapted the original code to my needs and made it available. I understand that Paul is interested to integrate it at some time, but he seems to be busy with other (hopefully pleasant) actions. At the...

The 2.9 ms is result of acquisition buffer (128 samples) and sampling rate (44.1 kHz) so you must change one of the two values to change the delay. This requires changing some basic parameters. It can be done, but not...

They cannot be 180 deg out of phase. there is a fixed travel time through the audio library Output is NEVER without delay to input. AFAIK I2S-input: data are buffered for 128 samples (2.9 ms @44.1 kHz) Amp:...

the way it is wired now, connect audio signal to both line in and oscilloscope channel 1 to ,say, left and channel 2 to right you could simplify, by connecting both amp inputs to same i2s input channel (left or right)

sorry about formating here is the audio code #include <Audio.h> #include <Wire.h> #include <SPI.h> #include <SD.h> #include <SerialFlash.h> // GUItool: begin automatically generated code AudioInputI2S ...

no, I was suggesting i2s ->mixer (+1) -> I2S left |-> mixer (-1) -> I2S right so left and right path have same internal delays

if you insert an audio object then you have to consider a 128 sample delay. So, insert two mixers in parallel one with +1 and the other with -1, then you should get the desired effect

the SPI speed and the CPU speed are total different clocks . However, if you use code where SPI clock speed is derived from CPU clock then you may run into issues. If this happens in old low speed avr code, I don't...

use SPI1.beginTransaction(SPISettings(4'000'000, MSBFIRST, SPI_MODE0)); spi commands SPI1.endTransaction(); or similar to control SPI speed (here 4 MHz)

which library you are using? could not find a MPU9250 for SPI that is compatible with your code