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If you are only supposed to generate a pwm signal for open loop drive control, it's an easy task with fpga.
You basically need a counter+comparator and possibly some extra logic for setting the pwm level.
Whiile if you want a complete closed loop controller, your system must provide some sort of feedback signals
in order to adjust the pwm level in real-time.
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I have some different opinion about this.
If the stepper motor controler is supposed with PWM,the stepper motor's speed is relation with the pwm's frequency.That is to say,if I want to get the
variable stepper motor speed,I should get variable frequency of pwm.
If the input frequency of FPGA is 50MHz,using the counter++,may get those frequency,like 25MHz,12.5MHz,6.25Mhz,....and so on.
But,there is some frequency can no be reached,like 20MHz,or 999999Hz.
I do not kown how to deel with this.
Do you have any opinion about those?
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