Inverse hardware PWM pair with nano every

Hardware Nano Family Nano Every
1
  • I need a PWM and its inverse to control a H bridge.
  • The switching frequency must be beyond human hearing range. So software PWM is out of question.
  • After reading the manual, either TCA or TCB offers inverted output.
  • CCL seem to be the right way to go but I'm rather unfamiliar with CCL.
  • I don't want to use external NOT gate if the MCU can handle it.

Any help is much appreciated !

2

Consider making 100% = zero and 0 = 100% by using the map function.

3

You might want to consider one of the new chips that has a TCD timer, like the ATtiny3217 (supported by DrAzzy's ATtinyCore.)

4

The CCL feature in the ATmega4809 can be used to provide complementary outputs of a Timer/Counter output. LUT0 or LUT3 outputs to A5 and LUT2 outputs to A0. LUT inputs can come from any of the Timer/Counter outputs and by setting the Truth Table registers you can have one LUT invert and the other non-inverting.

Using the invert output with the Timer/Counter would mean you would have to use two channels, which might give you some nasty problems if the phase isn't 180ยบ.

As an alternative, the ARM-based Arduino boards (Due, Zero, MKR series) have complementary output PWM channels. I don't know if the necessary microcontroller pins are brought out on the Arduino boards. You would have to check.

5

Hi,

the timers themselves have no invert function in that sense. But you can easily solve this by configuring the INVEN bit in the PORT.PINnCTRL register accordingly. Manual 16.4.

6

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