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My project is using the comparator within a T_3.2 or T_3.5 and CMP1 interrupts.
The functions for comparator configuration and handling are located in COMP1.h and COMP1.cpp.
COMP1.h is included in...

Hi,
in this forum I found code examples for using the comparator in a Teensy 3.5.
For comparator 1 a code example used

NVIC_ENABLE_IRQ(IRQ_CMP1); // handler is now cmp1_isr()
The macro name...

Hi,
from recommendations in this forum I installed TyTools. But after some time using it the serial monitor didn't work any more. So I uninstalled TyTools. But then it was not possible to upload any...

more info:
During testing T_3.5 the connection between VUSB and Vin was cut and there was a 4.2V external power supply via Vin-pin.

For such a configuration, is it necessary first to connect...

no reactions at all.

I guess I killed it. With the USB connected, all 3.3V outputs only show 0.5V. Except the USB cable there are no connections at all.
A small black chip about 1cm from the...

Hi,
after many tests with a Teensy 3.5 uploading various code versions, now it is not possible to upload any code any more.

USB type is serial. But I canot set the port as usual. Only COM1 is...

Oh sorry, it is in the manual for a Teensy3.2 and also Teensy 3.5.

In the Teensy manual for register CMPx_MUXCR there is a bit PSTM which means pass throug mode.
What happens with pass throug mode?

Hi,
I want to use the RTC with a Teensy 3.5 board but cannot find where the pins for crystal and VBAT are located.
Are these pins available on the board at all?

By try and error I found that delayMicroseconds(5) between wdt_config() and wdt_halt() is sufficient to immediately stop the WD-timer.

The reason for the necessary delay is open.

Hi,
I'm observing a curious behaviour of the watchdog on a Teensy 3.5.
To demonstrate this I connected pin 0 and pin 1 (RX1, TX1) and used the following sketch:

#define RFrec Serial1
#define...

WDT_T4 is for Teensy4. I'm using Teensy3.5.
I found a thread for Teensy3x which only suggests functions to set the timeout and to reset the WD-timer.
I also need to stop the watchdog and to...

The problem is a different one.
The code I posted was an extract from a large code. I missed to copy some lines with watchdog statements. Sorry for that.

The reset caused by the watchdog clears...

I have the following test setup:

1) a board with a serial output
2) a Teensy 3.5, RX1 connected to the serial output
Every 8 seconds the board is sending a string and after each fourth string it...

Hi,
for a sketch with Teensy 3.5, developped on Arduino IDE/Teensyduino, I want to use data types uint8_t and uint16_t.

What header file has to be included to know these data types?

That's tricky.
Without "const" it works.

void somename(char* myString)
{
Serial.println(myString);
}

Thank you

In a code example there is a function to print a directory.
The function:

/* Prints a directory.
* Callback must point to a function that prints one string. void SdPlayClass::dir(void...

I have no access to the compile line because I am compiling from the Arduino/Teensyduino IDE.
But nevertheless, what does it mean: -Wextra?

If a program needs access to variables which are used/changed by an interrupt routine they have to be declared volatile.
That's clear so far, but what is the best method then to access such...

Hi,
both problems now have settled down.
As already posted, problem 1 was a matter of char being unsigned for ARM but signed for Arduino.
Now problem 2 is solved too. It was a char array overflow....

Oh my goodness!
quickly edit without thinking :confused:
I transferred Arduino AVR code containing type char variables to Teensy code. In C++ for AVR char is signed but for ARM it is unsigned!
So...

When code shall be written for Arduino and Teensy it is recommended e.g. to use uint8_t instead of byte.

But Serial.print() does not accept uint8_t type variables.

Is there a simpler method...

hi, problem 1 is solved.
The code was initially written for an Arduino controller.
The decoder class has been transfered to Teensy code without any modification.
In C++ for Arduino the type char...

Well, in a former post I got this answer too.
But in this case it is necessary to compile with LTO in order to get correct results.
Without LTO every second data set is missed and switching...

For testing and to reconstruct the effects replaying the wav file generates a clean digital signal which will not need a comparator.
But the real application gets the output of a 433 MHz receiver...

Sorry for the missing attachment.
Now they are here.

KurtE,
the sketch is not working with wav files. The files are needed as external input to the comparator in the T3.2. The effects described...

hi,
in my program for a Teensy 3.2 I see effects which I only can explain by errors in compiling/optimization.

Mainly there are two problems, both happen in an interrupt routine:
1) a function...

I want to attach two wav files to a posting. Bot are compressed in a zip file and have a size of about 6 MBytes. After click on "Upload" I get an error:
Upload of file failed

The files are...

Because my program is quite complex and uses external interrupts, I tried to reduce my program to a version which can be posted here and made several tests. But then the effects are away. This leads...

You say that LTO is buggy. But in my case only LTO generates correct code. Even optimization "debug", which in my understanding is no optimization at all, is printing the variable Scount as some...

hi,
a search in this forum for "with LTO" brings a lot of threads but nothing concerning this type of compiler optimization.

My project on a Teensy 3.2:
A 433 MHz receiver outputs digital...

The background for my question was, that a code which successfully runs on an Arduino Nano makes problems when run on T3.2.
The sketch is decoding a Manchester coded signal from a 433 MHz receiver....

Hi,
I want to use interrupts to measure pulse lengths with a Teensy 3.2. The time between interrupts shall be measured by micros().
But anywhere I read that using micros() within interrupts might...

hi,
my initial post was rather complex. Now I have a more simple question.
For setting the clock rate the SimpleSDAudio library contains two functions, SD_L0_init() and SD_L0_SpiSetHighSpeed().

...

I am late with my reply.
Did you solve your problem and if so, what library did you use?

I am looking for a solution how to speed up SD data transfer with a Teensy 3.2 (96 MHz) which as slow as...

If you are asking for code on block SD read then I recommend the library SimpleSDAudio.
Yesterday I opened a post "speed up SD card transfer" asking how to speed up SD data transfer with that...

Hi,
I started a project with Arduino Mega2560. This project contains a library for audio output, SimpleSDAudio, see attachment. This library allows to output audio (speech in my application) by...

Hi,
for a project I needed a comparator with some filtering features. Teensy 3.2 comparators are matching this requirement very well.

To check the necessary settings I made a test setup with a...

That is exactly the code I also use with some minor changes.
- The code within setupu() is contained in a function SD_L0_Init(void)
- The last 2 lines of setup() are shifted to a further function...

analyzing code of libraries often shows define statements like

#if defined(__MK20DX256__)
#define KINETISK
#define HAS_KINETISK_UART0
...

and so on

Between a #if defined(...) ... #endif,...

hi,
there is an important difference between Arduino Atmel controllers and ARM controllers:
When porting a software using SPI interface for a SD card from Mega2560 to Teensy3.2 the transfer of data...

I have Win7.

I stripped the code down to only those parts for SD card and made a new project SDcardTest. I am testing with IDE 1.8.4 and Teensy extension.
The folder structure is:...

During some test loops - changing code, compiling, running with outputs on Serial Monitor - the USB driver seems to be lost. An information window appeared that a USB driver is being installed. But...

I doubt if hardware or software Serial is suitable for this task. A serial link is based on a fixed number of bits to be read.

If the Teensy is fast enough then using digitalRead() combined with...

Hi,
I am porting a project from Arduino Mega2560 to Teensy 3.2 in order to speed up the processing.
Teensy 3.2 is clocked with 96 MHz, Arduino Mega2560 with 16 MHz.

A part of the project is...

Sorry for the inconvenience,
meantime the problem is solved:

In the Arduino version there was an assembler file .S included for the interrupt routine which is not necessary for the Teensy...

Hi,
I want to port a project from Arduino 2560 to Teensy 3.2 with a 3rd party library SimpleSDAudio from Arduino Playground.
I'm advancing step by step. Replacing fast PWM on Arduino with...

It does not work.
I tried it also with pointer, but also no success.
I don't understand that.

But meantime I found a solution. I transferred the creation of the timer into a class definition...

Hi,
I declared my old post on "start/stop interrupts with IntervalTimer" as solved.
But now there is a new problem. The following code of a test sketch describes it.


// Create an IntervalTimer...