how to do: fluent servo move in C++

[nodobra]

hello everyone.
i am using robotis library to control servo via USB2dynamixel (TTL) and i am programming it in Visual studio 2005.
i would like to do moves of servo using keyboard arrows.
my algorithm is to get char from keyboard (in the loop) and increment value of goal position.
effect is not well rounded - i want to gain more fluent move (now it is very visible that "steps" are performed one by one).
does anybody know how to fix that problem?
is there a problem about frequency of signals from keyboard to PC?
is there a problem about bitrate of my usb2dynamixel? (tried every rate)
maybe i should completely change the algorithm?
thanks everybody
sorry about my english

[billyzelsnack]

Instead of commanding the servo to go in a small increments you can command it to go to one of it's extents when a key is pressed. 0 or 1023. When you release the key you can read back the servo position and then set it to that value to stop the servo where it is at.

[nodobra]

i am afraid uC of dynamixel has to do instrunction that has been sent to and interruption while executing instrunction "write word" is immposibble, ins't it? if you are sure about you opinion pleasy reply, cuz i have no ax-12 to test at the momment and i need to know it becouse of my project which is in progress.

[billyzelsnack]

I don't quite understand your last post.

[MOHIT JINDAL]

Hey I also want to Control full Bioloid with Visual C++ with Usb2Dynamixel Please share your code with me when you Complete it.

Cheers mate