Frank B
Senior Member+

maybe Paul can answer this? How would i translate: uint16_t rtlsdr_demod_read_reg(rtlsdr_dev_t *dev, uint8_t page, uint16_t addr, uint8_t len) { int r; unsigned char data; uint16_t index = page;

I may have a misunderstanding here.. is it allowed to configure the device in claim()? If not, how do it do it?

Ok, seems that the Teensy library is async. for this project, it would be more convienient to have it synchronous. the other way, a state machine is too much work here and not easy to read the code later... So:...

@Paul, could you please fork i2c_t3 by nox771? His last activity on github was 2018. His (great) library needs errormessage if used on T4... there were several questions about it, in the last weeks/months

This library does not support Teensy 4.x (would be nice to have an errormessage there...)

In an ideal world( which does not exist) we would have access to _all_ pads without high-density connections. Yes...inpossible..

Alex, I've added a reminder here: https://forum.pjrc.com/threads/66357-Teensyduino-1-54-Beta-7?p=272482&viewfull=1#post272482 This is all very interesting!

@Paul, here is a very interesting topic: https://forum.pjrc.com/threads/66465-Resampling-I2S-slave-inputs-at-the-T4-T4-1

Yup. Ok, I think I will start tomorrow and see how far it goes. If I get stuck I will ask :) Luckyly, I have to take a longer break in between to fix my Motor Scooter.

The distance (9*160mm with connectors) is quite high. Yes, using lower resitance pullups is a good idea. You could go even lower - mabe 1k? If that still does not work, I'd try a lower I2C speed.

Edit: Err.. ok its too late- going to bed .. should not post wrong things.

MicroMod Teensy <--> Teensy MicroMod So, these are two different versions. I have a Micromod board... didn't bother unboxing.. :) It's for the MicoMod Teensy 3.2 Luni board I didn't solder... John: Go and find...

Its indeed the same schematic as in the datashhet. Note the datasheet says, for lower frequencies (as we have) you can omit the output filters.. (but hey, it's just a resistor+cap) - adding them allows you to play with...

Here is a schematic: taken from here: https://electronics.stackexchange.com/questions/419171/pcm5102a-analog-output-level-not-what-i-expected. I'd just use the breakout and solder it to yours... Edit: Here is...

Special Agent 007 (his name is Rom. John Rom.) found it :)

Agreed, the PCM5102A is good.

Depends on how much sense it makes for users to lose a lot of functionality just to have a small form factor - that with an unrivaled fast CPU. I think many would favor a good display. That's for Paul to decide. I...

USB is much faster than Hardwareserial, so it receives much faster than Serial1 can send it. You want something like while (Serial1.availableForWrite() > 0 && Serial.available()> 0) Serial1.write(Serial.read());...

would just use the bounce library. Since this is just about mechanics, it is not necessary to use interrupts at all. It makes no difference if you know the state of the switch within 50 nanoseconds or microseconds....

What are these "encoders"? Link? Seems to be I2C? How many pullup resistors are there, and what value? How long is the connection in sum?

I said writing a new file is slow. Or, more exactly, opening a new file for writing is slow. Edit: Opening to append data to a file is slow, too. Best and fastest is to open and close a file once, outside a loop,...

Please notice, that your chunk size of 1200 is not optimal - a block is 512 bytes - so (2*512) would be better. Not sure how Bills library handles that. Perhaps it has its own buffer, so your chunk size may be ok....

MicroMod adapter boards for all teensy models would be a nice thing. (as long I don't need to solder the connector ;-)

Resampling for inputs is a good thing. Have measured how long it takes? (cpu usage) How much memory does it need? Would it work if I set the sampling rate of the library to 48k (or perhaps 96k) ? Could the code...

I installed Wireshark. Thanks again. Did not know that it can monitor USB traffic, too. Oh my... that allows to look at other devices, too...

Because the pins are needed for other things. Usually I2C chips support different adresses, so for most applications three busses are enough. Other things are important, too.

I don't like the density of the connector. And that it is needed.

thinking of the 2nd row.. i had the idea, it could be a (oh my english..searching for the right vocable.. ) mouser says it is a "Card-Edge-Connector" (German "Leiterplattenverbinder") First row - normal, pinheader -...

I like the double rows, too. The "problem" with the double row is, that soon there will be users who solder both and place the Teensy into a breadboard and wonder why there is smoke or something does not work. Perhaps...

I hope we don't need wireshark..! But it is a nice find. Thanks! The sourcode of librtlsdr is available (see Post #12) - I hope that it is enough.. at a first glance it looks ok, and seems to have all info. It...

Maybe yes. Or, perhaps the manual is wrong about the default. There are several things with wrong info... i.e. the all the PFD had wrong values at least in rev 1. Don't trust the printed defaults.

The IGP is already running with 150MHz. Not sure about the GPT frequency (would have to take a look..) The clock diagram on Page1016 (Rev Manual V2) say it can be switched between IGP and 24MHz with CSCMR1. Perhaps...

Under preferences is a menu "Cortex Debug" Interesting, I wonder what will happen there with Teensy!

Usually, it takes a few days after the release. Edit: There is no release on Arduino.cc? All I see is a Beta 3.

Should be doable, but need some little changes to the core files... maybe Paul Stoffregen reads this and adds some macros... Edit: The Teensy loader will not find it anymore but there's the 15 sec reset that erases...

I hope I understood your question right... maybe, not... I don't get what this has to do with the bootloader, how a bootloader can help to remap inputs, and what the bootloader should do exactly. Can you clearify that?...

Yes, the signal quality is good. Edit: In Europe te least, GSM can be at 900MHz (parts). Air traffic is in the >100MHz Range. Transmitting an ILS signal would be not a good idea ;)

In fact, it's both <- that was with a Teensy 3.2, many years ago (turn on Audio). All pins disabled. Single pin: With T4 and using 5cm wire, I can receive it with WFM in best quality HIFI stereo 10 Meters through...

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 (when my PCB arrives)

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?) My DAB Radio 2...

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 - Turns on or off...

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! (a little...

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, Class=Human Interface...

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 works good without...

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 tomorrow. However,...

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 uses it as SDR - it...

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 if you want. I'll...

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.

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 it is 480MBit...

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

@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 a few years ago.

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 percentage of users....

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! It's a bit expensive.. I think If I can find it somewhere, I'll order one and build an adaptercable.

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 lot of parts...

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 both ends to GND? If,...

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 this an AVR user..

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 there is a difference...

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 } void main() {

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 and pointers, RAM and...

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

You don't want 44100Hz... there is no divisor for it. Try 44117,64706Hz (there is no audible difference) As said above: It works. As it is :) I'm aware that it fires twice.

Ok, didn't see that you use the DACs.