Simulink Arduino Servo Write Blocks

Hi all,

I am trying to use Simulink together with Arduino, controlling multiple ESCs, thus needing to use the Servo Write blocks from the Arduino support package.

My problem is that it is specifically stated that one should not use these blocks with External Mode. I must have the ability to view and analyze feedback data, as well as change parameters "on the fly".

Is there ANY way I might use these in external mode regardless? perhaps there is a custom-made s-function block on the internet designed especially for that? maybe another way to generate a high-resolution pwm signal between 1-2 ms (within a 20 ms cycle)?

Many thanks in advance...