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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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generate clock enable using modulo accumulator. add your word non-stop. then at overflow generate a pulse The equation for frequency becomes:
f = clk speed * accum word value/accum resolution
e.g. if accum is 32 bits and word is 2^30 and clock is 50MHz then:
f = 50 * 2^30/2^32 = 50/4 Mhz
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