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Arrived today. Well. China.
Its defective, shows stripes on the left side and some more issues like bad colors.
Lets see if they send a new one.. :)

Its good enough to do some tests with VGA...

Thanks :) That's what I'm "seeing" too.

Of course, the metal box would be a good solution.

Which library?

@Mark: Great! Thank you.
Can you repeat this with FPU usage, and I2S enabled? (don't know if the if makes a difference wether there is a load on the pins or not.. maybe try with audioshield added?)...

It really should work with any of the 3 S/PDIFs...

Hi Kurt,
it prints this:


USB HID Device Info Program

This Sketch shows information about plugged in HID devices

*** You can control the output by simple character input to Serial ***
R...

please not.



A optional extra shielding, housing would make sense to sell... the faster Teensies more and more become a transmitter.. a lot of EMI :)
Try to use a DAB radio in the same room!...

Yes, Happy Birthday and all the best!

The new Stick arrived sooner than I thought.
Attched the output from Usb Device Tree Viewer.

Interestingly, it does not show the IR Recceiver (but it must be there).

...Linux says, it is "usb-storage" (but it isn't)


frank@frank-lubuntu:~$ lsusb -v -t -d 1d19:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/12p, 12M
|__ Port 1: Dev 2, If 0,...

Here is the Windows software: https://airspy.com/download/

LOL :)
Ok, if you want to use it for other things than FM you'll need different Antennas etc. , and for lower frequencies a little hack to the hardware is needed (Or a frequency shifter)
But FM...

Kurt, yes, RTL2832U & R820T looks good.
The dump i posted above is from a different one (has a different "tuner"-chip ) but I've oderd the one from the Amazon link I gave above that will arrive...

https://www.amazon.de/gp/product/B07DJT5NHD/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

It is intended for DVB-T, but there is a lot of Linux and WIindows Software (try "Airspy-SDR#") that...

Kurt, thank you very much. I'll post what linux says :)

Yup, but the receivers with RTL2832 first (even if they have a "RTL2832" they have different additional chips but I think I can handle that when the communication is working.)
I can send you a link...

MjS: No, i dont want the IR.
I need the first "child", i think.

It is a DVBT receiver.

Its think its good to have a more generic "howto". Later, i want to add the next device.. audio :-)

To make it more clear - I know which values to send, etc - I just need help with the libary.

Ok,

an easier question.

If I want to support a new USB device for the USBHost library - where do I start? Which are the first steps?
I've attached all info as Windows sees it.

My Program...

It's for a DVB-T stick, used as a SDR.
Yes, I sometimes followed these threads - but have no Idea what is supported and what not.
It would be more for the T4 - don't think 3.6 has enough power. And...

@Tim, can you make a normal pullrequest to the T4_Powerbutton?

I never really wanted to deal with the USB stuff, but for a new project I can't get around it.

I want to port a PC software to the Teensy.

It uses libusb:
libusb:...

@Defragster, wasn't that thing I did with a DIE() macro?
@MeeBoob - Yes, I played with unwind-tables, too, not very successful.
I hope you have more luck!

Dont know if that has changed lately but in the past their libraries had horrible bad code... :)
I once saw a graphic driver and other libs and i decided not to spend time with this ... ok that was...

Very interesting thing -I'd like to see your code?
I made something similar, but dont get much useful info.

My codes just resets after a hardfault.

Do you have an old 12MHz Hub? Don't know if that would work..I'm courious.

The way is to simply add an extra jack. Whatever you do - never connect the jacks GND to the normal GND. If you really want to go that way, cut all three connections.

The help in the Auio Library GUI says:

Then, you want to remove the SGTL500 Control.

15ma is way too much. I think its max 4mA for static DC for a single GPIO pin.
Not sure about PWM.

I partly agree. Teensy needs more pins. Not because one needs all pins, but because of missing functionality.
Then the question I would like to rise is, if really anyone needs 8 Serials... or which...

I tried that and can't confirm that. Looks like your Teensy has a defective pin.

@khoadley, if you look at the schematic - for Teensy - it seems you need to provide 3.3V to "VIO" (do NOT close JP7), and in addition the board wants 5V.

They even have connectors with inbuilt electronic ... filtering and EMI protection...
amazing!
23847
It's a bit expensive.. I think If I can find it somewhere, I'll order one and build an...

Found some great PDFs in German, from Würth Elektronik.
They say VBus (5V) should have a ferrite.
More advanced designs they propose have pretty complex schematics, just for the connector - with a...

Oh.. just noticed.. that the 4.1 has the TPD3S014 on board .. t4.0 not.
Seeing this the first time.. :) great.

Ok, on the Teensy 4, the 2 pins are just connected to GND.. I assume one is the GND wire in the cable, the other for the shielding?
So, that seems to be OK.

Sorry, I'm talking about the schielding of the cable.
The usb cable has GND wire, and a shielding that must somehow be connected to GND, too.

My Question is: Is the cable shield connected on...

Thinking of ground loops, EMI, etc:
A question re: USB Host
Should I connect the shielding of the USB Connector for the HOST to GND or is it better to do this not?
Is there a difference with...

Have you tried Pauls sketch?

Directly, no.
But you may ask the friends in this thread: https://forum.pjrc.com/threads/43165-Over-the-Air-firmware-updates-changes-for-flashing-Teensy-3-5-amp-3-6?highlight=flashing

You can't write the bootloader.
You can write to the teensy-flash,( but not to the bootlader )
That works with a normal Teensy - no extra booloader chip needed.

I've patched the denom value,
and added a search for the divs - now, more frequencies are working (if not all - tests needed)

Edit: really amazing that the PLLs work with up to 1.3GHz - tell...

I've added it here, with a link to this thread.

Yes, thats the same what the Reference manual says - everything but the max 960000.
I'll update that value. Thanx :)

Thanks!
The reference manual says not any word about this. (only that it can be 29 (or was it 30?) Bits wide) - I'll test if it makes any difference. As said.. the program works .. so i wonder if...

Hi,

AudioProcessorUsage() does not take the time needed for the DMA ISRs into account.
Some need quite a time (like S/PDIF emulation on Teensy 3.x).

I'd suggest a function like update_all()...

You may have seen setup() and loop()
Forget that.. they are just functions.

its something like



void setup() { your code here }
void loop() { your code here }

First of all, you should think about what you actually mean by "memory management".
Since you obviously know C, you know that there is at most new/malloc/free - and there is the stack, variables...

I'd check your desired frequency with a scope or frequency counter.