Acceleration Issue

[71tr6]

Is there any way to control the acceleration better?
Here is my test code:
`

#include <ContinuousStepper.h>
int rpm = 600; //Set rpm
int sps = rpm*1600/60; //Steps per Second

ContinuousStepper<StepperDriver> stepper;

void setup() {
  stepper.setAcceleration(100);
  stepper.begin(11, 12); //step pin, dir pin
  stepper.spin(sps); // rotate at X steps per seconds
}

void loop() {
  stepper.loop(); // this function must be called as frequently as possible
}

`
Without the setAcceleration line, the motor accelerates up to 400 rpm rather slowly, then stays there for a bit, then accelerates very rapidly up to 600 rpm.
With the setAcceleration line, it accelerates up to 400 rpm VERY slowly, stays there for a bit, then accelerates to 600 very rapidly.
I'd like to see the acceleration be quicker right from the start and stay linear.
Any chance this can be made to happen?

[bblanchon]

Could this be the same issue as #15 (comment)?