Arduino for STM32

Posted: **Thu May 07, 2020 3:55 pm**

Hey

I'm working with the example https://github.com/stm32duino/STM32Exam ... ration.ino and it works quite well on my BluePill board!
question: Is it possible to update frequency and DutyCycle in the loop Function? because of the following line in the setup functions, i thought, tat it should be.

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  // Instantiate HardwareTimer object. Thanks to 'new' instantiation, HardwareTimer is not destructed when setup() function is finished.
  
  HardwareTimer *MyTim = new HardwareTimer(Instance);

In the loop i tried:

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MyTim->setPWM(channel, pin, 1000, 50);

but the error log says:

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error: 'MyTim' was not declared in this scope
   50 |   MyTim->setPWM(channel, pin, 150000, 50);
      |   ^~~~~
exit status 1
'MyTim' was not declared in this scope

Does somebody know what am I doing or understanding wrong?

greetings, Jens

Posted: **Thu May 07, 2020 4:47 pm**

Make MyTim global, put it before setup

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HardwareTimer *MyTim;

And remove HardwareTimer * before MyTim in setup()

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MyTim = new HardwareTimer(Instance);

Posted: **Fri May 08, 2020 6:26 am**

Thanks! it works fine!
I was confused because of the "new" in Hardwaretimer *MyTim = new HardwareTimer(Instance);
I think I lack the deeper understanding of programming...
if anyone would like to explain it, I would be grateful - but it is not necesseray to mark this post as solved.

greets, Jens

Posted: **Fri May 08, 2020 6:49 am**

jenspogo wrote: Fri May 08, 2020 6:26 am Thanks! it works fine!
I was confused because of the "new" in Hardwaretimer *MyTim = new HardwareTimer(Instance);
I think I lack the deeper understanding of programming...
if anyone would like to explain it, I would be grateful - but it is not necesseray to mark this post as solved.

greets, Jens

Oh, this is how pointers and dynamic memory allocation work
you can't define HardwareTimer object statically there as constructor parameter is not constant, but depends on pin, so it allocated dynamically, at runtime

Arduino for STM32

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