Impossible to vary square wave FREQUENCY output based on a PWM input?

[anon35827816]

@trentonp

The duty cycle for the PWM signal from the receiver ranges from 1 to 2ms and the frequency of the signal is 60hz.

Can you confirm that the incoming PWM duty cycle is between 6% and 12%? That sounds a bit odd to me.

@trentonp

To drive the stepper, I need an output signal of ~1Hz (slow speed) up to ~70 Hz (fast speed) to the STEP pin (Im using a TMC2208). Duty cycle of the output signal doesnt matter as far as I know...because I think the stepper driver reads the rising edge of the signal to determine frequency. Keeping a constant 50% duty cycle seems to work fine.

I had a quick glance at the TMC2208 datasheet, but I'd need to study it more to say something smart...so just one question: have you confirmed experimentally that the 1~70Hz pulse rate is indeed correct?

How much resolution do you need? This is going to determine the feasibility of measuring the 6~12% duty cycle of your 60Hz incoming PWM. Unless of course I misunderstood what you said about a 1~2ms duty cycle; it's kind of odd to express a duty cycle in ms instead of %.