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Yes, I detached/cut completely the cap using small scissors. Nevertheless, the Teensy stays dead, the Arduino IDE say that there is no device attached to the USB cable. :(
I'm using a no-polarized...

On the fly:
I tried to re-program a Teensy 3.2 via the USB cable after a 0.1 uF capacitor was soldered on the reset pin. The Teensy seems now dead (no led light, no output on the attached TFT...

Ok, thanks a lot for the precious information!

So why people struggle in setting the flash security byte???
(For my needs, preventing my sketch-software from cloning via the USB plug would be enough, since everything, but the USB connector, is...

Do you mean in any case, or just when the cap is soldered on the reset pad?

@Paul
thanks, I will order some of those components with "open drain", and do some tests when I will be back from Italy

@thereminggenieur
the minimu reset delay provided from manufacturers is...

Actually, on Mauser I have found a lot of "supervisor circuits" realized by PTH components, with just three pins. Here my selection based upon the threshold voltage (2.9 volt):
...

Found! Thanks.
I will give it a try. Unfortunately I will not able to test it until the middle of July, since my motorcycle will be transported to Italy tomorrow...

Yeah, seems that you won. I have to migrate (although partially) to the SMD world. Now all I have to do is finding a device able to miniaturize myself to be able to handle those little components for...

Cannot find any file containing that text in the folder arduino-1.8.8/hardware/teensy/avr/cores/teensy3/
I'm missing something?

PTH or SMD, things don't change they are just on a different scale.
A lot of hobby-makers simply do not have money to design and build complete product to specifically fit their needs and sizes...

Hi defrag,

what source code file I should check?

Hallo,

your proposal would be applicable if only I could have the necessary space to solder all of that components. Unfortunately I'm still using PTH components soldered one by one.
I think also...

There is no "all-in-one" component available on the market that provide the "power good" functionality?
I mean, something with a built-in prefixed threshold (3.3 or 5 volt) that can be put in the...

Update.

After adding the capacitor, the Teensy 3.2 seems no more re-programmable via USB (IDE 1.8.8 + Teensyduino 1.45):


Teensy did not respond to a USB-based request to enter program mode....

Hi Paul,

so a Teensy 3.2 owner like me should have not significant improvements by upgrading Teensyduino from version 1.45 to 1.46, right?

Another question:
after adding the capacitor between...

The LM2597N-3.3/NOPB converter has a pin called "error flag" that seems very similar to a "PGOOD" pin:

Open collector output that provides a low signal (flag transistor ON) when the regulated...

Thank you guys for all the infos. Seems that Teensy lovers never sleep... :D
I will check those intriguing threads.

@Theremingenieur:
where I can can find one of that so delicious voltage...

P.S.

I really hope that a future version of the Teensy 3.2 will provide a Reset pin, not just a pad on the rear side. Desoldering the Teensy to add the cap was a total PITA!
(I know that there is...

I revamp this old thread just to say that adding a capacitor between the reset pad and ground solved my boot-problem too (Teensy 3.2).

My Teensy was starting flawlessly when

1. powered by the...

No news about resetting the Teensy 3.x via software?

My Teensy 3.2 is equipped with a TFT screen. My idea is to propose to the user a menu option that allows to reprogram the Teensy.
When user...

Very interesting. That would be a "game changer" for me and my needs.

You're inspiring bad ideas in my mind... :D
What if I connect that pad to an output pin of Teensy itself? What happens with an instruction like "digitalWrite(LOW)" executed on that pin???

Pressing the button always unlock the lock? For this reason is necessary to force the complete erasure of the flash? To prevent malicious reading of the uploaded code, yes?



It happens at the...

Thanks Paul and defragster for the answers.


Definitely it is.
Take in account that a lot of people (like me) come from previous experiences with Arduino. This can lead to some misunderstandings...

I revamp this thread to ask confirmation about the intended worklow for setting the security byte on the flash RAM of my Teensy 3.2.

As I understand, the typical steps would be the following:

...

Thanks Paul for the detailed answer.
Now is up to me to take a decision... probably the best thing is to buy a second-hand PC with fresher software version (unfortunately, the space on my desk is...

At my little laboratory I use a paleoarcheogical 32-bit PC with Ubuntu 10, marked with "by Ramses II" (I use it to drive my CNC-mill because it has an old parallel interface).

It works well with...

Nice!
Keep us informed.

If you want, I could send you a cheap 1.54" 240x240 TFT with all the wiring ready to plug and test.

As many TFT, mine also keep in graphic memory the contents of the previous running program.
When the sketch started again correctly, I saw the previous contents of the screen for a fraction of...

My test sketch (the one at the top of this thread) doesn't work even with with the latest 1.4.7 adafruit GFX version.
As before, I had to downgrade the lib back to version 1.3.6 to make it working...

Same result as above with "speedtest.ino".

I have also upgraded to GFX lib versione 1.4.7 (yes, another recent upgrade) and restarted the IDE. Again the same problem as above.
All I see of...

The sketch "graphictest.ino" doesn't work properly:

1. the black background color is turned to white
2. the screen is translated down for around 3/4 of the screen height, and translated left for...

Just a moment...

Here the datasheet.

No, is this 240x240 pixels from Aliexpress:...

Hi everybody,

my Teensy 3.2 was working like a charm if using the "old" libs by adafruit with an 1.54" TFT display:

GFX version = 1.3.6
ST77xx version = 1.2.7

(See my simple test sketch...

Ok. Thanks for the answer
So the "risk" occurs only when the the USB connector and the external 3.3V supply line are both plugged at the same time.

(Thread resurrection :D)
I plan to power a Teensy 3.2 by using the 3v3 pin too.

Question:
do I need to cut the "VUSB trace" if reprogramming Teensy with the USB cable and the supply line (going...

UPDATE

The pin 11 in the wiring image is wrongly named. It should be "MOSI", not "MISO".
Here below the right wiring:
15606

So, I'm not the only one seeing it! :D
Anyway, a minor bug.

clever :cool:

What comes to my mind is that, maybe, different instances of the Adafruit_ST7735 classes share the same CS variable. But I didn't find any trace of this in the adafruit libs... :(

Could you post...

Here my little contribution, hope it helps. :cool:

I bought a cheap 1.54 inch TFT display. Despite all my doubts I was able to make it working by using the standard Adafruit libs on my Teensy 3.2...

How you made the 1.54" working?
Can you post how you initilized the TFT by using the ST7789 libs by Adafruit?

For now, all I've got is a black screen on my 22 pins TFT purchased on Aliexpress....

Not sure, just guessing:

"Any digital pin can be used for a SS (slave select) signal. The SPI library does not control the SS signals, because devices differ on when this is used, whether it is...

Just my little contribution here. I hope it help somebody.

Prologue

Before today, I was my using 1.44" TFT display from Aliexpress on my Arduino and (very) old Adarfruit libraries with success:...

It works very well for me, but... again that noising java exception when starting the Arduino IDE for the first time (i.e. after running TeensyduinoInstall.linux64).
The graphic is messed at the...

I've followed this steps on Ubuntu 16.04

1. downloaded and unzipped an Arduino 1.8.8 IDE
2. created a "portable" directory in the IDE installation directory
3. tested the IDE with some examples...

Thanks a lot Paul for the detailed information. That was exactly the kind of info I was looking for! :cool: