Frank B
Senior Member+

..any you may alos want to look at pulseClock with just uses a "nop" #define pulseClock cbi(P_SCK, B_SCK); asm ("nop"); sbi(P_SCK, B_SCK) That's way too fast, I think. Maybe just edit the cbi and sbi macros and...

void LCD5110::_LCD_Write(unsigned char data, unsigned char mode) { cbi(P_CS, B_CS); if (mode==LCD_COMMAND) cbi(P_DC, B_DC); else sbi(P_DC, B_DC); for (unsigned char c=0;...

...would be easier to answer if we knew which library you use :) maybe we can look at it...

*phew*.. I think I have all added up to now. The list ist growing. Impressive. Later, in 2-3 weeks, maybe :)

Tim, got my email?

Thanks! Typo fixed, and outputs added. I won't add links to products or breakouts. Or what do you think? Some PDM(/TDM??) microphones are missing.. haven't used them

Added some links!

I remember I have tested it years ago. So, yes.

Paul said, pinMode completely reconfigures the pin. This includes interrupts.

Thanks, added :)

You need to upload the video to one of the sites mentioned in the video link window , and then enter the link into the window.

Yes of course.

Oh, that means it indeed works with the inbuilt LED. Seems that the measuring just needs to be 1000 times faster? (us vs. ms)

So, both show ~5v. Exactly right. I have NO Idea why your LED only work with the PSU 5V line connected to the Teensy. A ground loop?

That again could be a simple SPI-in ("MISO") on the Teensy. (CLK-pin unused, perhaps)

Can you measure the voltage there? (Without your wire connected) Take a look at the Teensy schematic. Vin (on the board it's called "5V") is directly connected to USB. So you connect the PSU with your Dell, if you use...

Thank you Pauls The AD is 1MSPS. That was known back in january. I've seen to late that you'd need 10MSPS.That is too much, I don't believe that you can overclock it that much.

WOw.. is that fast enough to record a TV (F)BAS / CVBS signal?

@Pauls: Thank you - fixed, I hope? @Deane: If you want the whole procedure exactly as shown in your picture, it gets a little more complicated.. I don't see that you can program that.. This is not meant in a derogatory...

Ok, the 2nd puls (code from Post #8) might be little too fast-.. maybe try it. If it does not work, we'll see how to make it a little bit longer. Edit: There is a gap between both pulses. Seeing Post#12, that gap...

This is pushing the limits of my cheap equipment.... Cheap scope with cheap probes. Is that short enough?

Maybe tell us which speed do you need.

Or have you cut the contacts under the teensy? In this case the connection would be right...

Ok, Dell ;) It is more likely a loose contact somewhere else. Remove the cable to Teensy 5v if you're using a PSU.

That makes no sense. Be aware - you're feeding your mac with your PSU now. Not healthy.

The for (;;) is a loop (inside the loop()) It is there to prevent that additional things are calld (not visible in your program - teensyduino adds them, invisible) SO...no...it runs !faster! with for(;;) Edit:...

That's right. You should disconnect it. If the voltage comes from external. Are the wires OK? I had more than once problems with faulty, cheap china wires.. If you have a DVM you can test if the pins on the 74 have...

1) It does not work to just plug the pins into the teensy. They give no - or very bad - contact. You need to solder them. I see no solder on 3 (or is it 5?) Volt + If hope not both, USB AND external 5V are...

So it's not PJRC that will be doing the final inspection for the Teensy MM? ;)

That's a clever way to make the whole process efficient, and to create a Teensy "sign of live" for the user at the same time.

Valid argument! Nothing of this would be impossible by just an other blink that gets executed by Python or whatever. It would be *preloaded* only. Removing it would be exactly the same as overwriting the...

...I like the Idea of a pre-loaded Teensy. Whatever system it would be. Forth, Basic, Python..

Form the pure technical standpoint maybe yes. Try to find a youtube influencer that promotes it :) Doesn't it use the reverse polish notation (Or do I remember wrong)? "(A+ B) * C " is "A B + C *" ? I'm afraid,...

Yes, I remember there were articles in some magazines, including ELEKTOR about using CMOS memories as camera. It is, however, interesting how good a simple LED works as sensor.

Not sure.. if this is what you want? const int ledPin = 13; const int fastPin = 14; const int fasterPin = 15; //added const int ns = 78; void setup() { pinMode(ledPin, OUTPUT);

RE: Oversampling: I see no reason why it should not work with other Chips, too. But it would need even more switches or output-objects... so ... maybe it's better to just keep it simple?!? If we want to clean these...

Not sure if we should disable it, now..

So, real question : Is there a way to use the builtin LED on pin13? I suspect, not, because we can't charge the capacitance? Or is there maybe any other effect that can be measured?

No you can use any pin. Important is just the direction of the LED. You need to swap "+" and "-" measure the capacitance this way. The "capacitor" discharges slower or faster depending on the amount of light. The...

Yup, left over code.

... ok.. I guess it was too easy.. again... my last question of this kind (turn speakers on) was answered in record time, too :-( const unsigned p1 = 17; // LED-Anode const unsigned p2 = 16; // LED-Kathode ...

Very warm. But it is pure digital. No ADC(?!) Oh man I should have used pins without ADC..

Hm, so the "garbage" is less when I remove my hands? What kind of "garbage" do you think, is it?

I'm afraid currently there is no good solution for more than 16MB RAM. One could come up with the idea of simply using multiple (more than 2) PSRAMs on QSPI. But that's difficult because they would need multiple...

@miciwan - Yes, a really nice write up. Would you please add it to the Wiki?

cebersp, sorry.

This will be easier when Littlfs for "internal" flash is ready to use (on Teensy 4.x). When it's ready, I'll look at this.

You can add this functionality to your program. Thats even better than to have it in the PJRC-bootloader (and other people may not want it) You just have to make sure, that this part is íncluded to the program on SD,...

Oh, I think it's not too difficult to write some code that loads a program from SD to RAM and executes it there. Might involve reserving some space in ITCM (via .ld file), some stack tricks, fiddling with the...

Did not "crush it down". Just said that I think that it is not really needed. There are TODOs with much higher priority. Can Raspi do what Teensy can? :) Work without SD? :) Boot in a few milliseconds? That's a...

@jcj: Can you do a pullrequest for your Opus addition to the Codecs? Thank you.

I think If they can copy a hex-file to SD, they can start the teensyloader and select the hex-file, too..

Please use code-tags when posting code. How do you measure this? I had problems getting my cheap scope to trigger with your code. I think you just did'nt see the pulses. The code below works better: Don't...

@Paul, please take a look here : https://forum.pjrc.com/threads/65851-Problem-reading-from-SD-card-directly-into-PSRAM

Agreed. It should be there for the 4.0, too.

Glad that you found it! Perfect! Those things are hard to find.

Sorry too late here - almost midnight - have to work tomorrow. Again - this is a shot into the blue. I don't know if it is the problem - but for me, it seems not too unlikely. I can be totally wrong, of course. ...

Don't know... And I can't find the old thread :-( I remember the SD Spec says, the pullups are required. I guess the controller thinks they are there... The patch was a workaround. And it took me a long time to...

The reason for this is patch is a bit complicated.. If the connections have no pullup, they can toggle when the interface pauses. Maybe beacuse lines in the near toggle. The chance that this happens may increase when...

Yes the same thing happens. Maybe it's the same problem as here: https://github.com/PaulStoffregen/SD/commit/cea34a24d81072ba91e47331cea9176826a6cfae SOmbody has to take a look... don't know if the SD Controller...

I'm using the beta. Does not help. Looking the schematic, there are again no pullups on the SD lines..

I can confirm this. Have you informed Bill Greimann? He should know, at least, why read returns an error here. Seems to be totally random?

Yes and there are more examples. I think it can be useful for bit-banging, too, sometimes. Just in cases where you need to control the exact timing. However, that's not often the case.

Maybe D+ and D- are swapped?

Yes, that's the procedure I described in Post#11 (with less words)

Hi Paul, i *think* the I2S slave-input works now, too. I have some problems with my hardware.. need to check the soldering of the microphone or have to connect a line-in somehow (I never use the input) I've just...

I added DIE: https://github.com/FrankBoesing/cores/tree/hardfaults void setup() { DIE("I felt it was time."); } void loop() {} resets and prints: sketch_jan17a.ino

Probably similar to this: //Macro test //#define DIE_WITH_PATH #if !defined(DIE_WITH_PATH) #define _FILENAME_ (__builtin_strrchr(__FILE__, '/') ? __builtin_strrchr(__FILE__, '/') + 1 :...

I have an Idea.. I could extend the Hardfaults for a kind of "user" exceptions. It would need a macro that prints the userdefined text together with the GCC macros __FILE__, __func__, __LINE__ It would work like...

That sounds like a good plan. Perhaps I can add the SPIFFS then, too.. in a few months. Actually, it should be possible to integrate USB drives, simple network file systems, etc. with it...

I guess we need Windows-like drive-letters or devices..or canonical paths... ? Like "//littlefs/flash0/MyFantasticFile.txt" But, really, I don't know what the plan is. Edit: With "SD" as default - "Builtin" for...

Hm i did not read about that, but I thought FS.h was a wrapper for all kinds of FS? I guess it just needs an info which FS is used. But I have _no_ knowlage about all this stuff. I wait for someone who writes a...

No, a GND connecton is needed in this case, too. Don't know how better LAs do it - maybe they have a USB Isolator builtin.

I just saw that - if no DMA channel is available, Teensy just hardfaults. If there was a intention to put the hardfault handling into the core, i'd try to add something like printing an errormessage for problems like...

Ooops sorry, that was for T4. There is nothing on T3 that would blink after 15 sec. So, 1) Disconnect USB 2) Press and hold the button 3) WITH BUTTON PRESSED, connect USB. A new sketch schould upload now. Try...

:-) 1) Press the button 15 seconds - until a short blink 2) Release it. It should blink now and be the state where it was brand new. or connect 3.v3 volt to Pin 29.

You can hide a software-serial into the blink.. if fast enough it wouldn't be visible and look like "LED ON" but with a optical link you could see debug messages ;) Ok, just a dumb idea, ignore it.

Nice :)

Danke :) Hab grade die ersten Beiträge überflogen. Also der Teensy 4.x kann ganz sicher eine sehr hohe zweistellige Anzahl von Stimmen :) Irgendwer schrieb mal er würde 15 samples aus externem Flash gleichzeitig...

Or maybe a misbehaving ground loop. Is the LA connected to the same computer?

Oh man... why does everything have to be in English. Why are papers by Germans published exclusively in English, and then have to be translated back by other German readers... grrr :) We pay taxes... ;) I see it...

..and you can remove the housing from these boxes and just use the board...

Why were these tweaks needed? Does it not work without? Do I have to take that into account somehow? I did not test EQ, surround and volume ramping (and at the moment I can see no reason why they should'nt work)

I'll start work on Teensy LC IS2-Input now.

Not really. It just makes sure that the CPU resets as soon as possible. Otherwise it can happen some cycles later. If you want to be on the save side, add the "dsb". It has to do with very technical details, pipelines...

I added this page to the wiki yesterday. It contains a few additional things, too.

I don't know, too. Maybe connect LEDs to 18 and 19 and test the pins. btw, this is their schematic: It says 4.5V minimum, too :) And, at the moment I can't find the I2C voltage mentioned.. edit: oh found it.

Which wire is the GND connection to the Teensy? Edit: ok seems to be "ID".. the 4k7 are max.. yes 2k2 are better.