The docs seem to indicate that you can read and write to the motor encoder array.. but I have not found this to be true;

nMotorEncoder[motorA] = 300;

this statement does not set the encoder value to 300 as I expected..

is this not permitted? is the only write allowed, used only to reset the value to zero?

dave

Yes. Any write action resets the encoder to zero.

The "legacy" behind this is that ROBOTC uses the LEGO-developed motor functionality which only provided the capability to reset but not change to an arbitrary value.

Thank's for a confirmation..

.. something for the next edit of the encoder description because it is natural to think you could set it to a value..

a 'resetEncoder() function might be a little more intuitive with any write attempt flagged as an error.. but I realize this has more than one platform and has other contexts..

dave

Improved documentation -- will do.

This concept of any write to a register resetting a register is actually fairly common in many micro-controller CPUs. But I realize that this is also an obscure fact to the majority of NXT users.

Thanks for reporting the problem.