#9 MotorRotationCount & MotorBlockTachoCount bug

[LorenzoSabattini]

Hi,
I think I found a bug in MotorRotationCount and in MotorBlockTachoCount.

I made this simple program:

#include "NXCDefs.h"

task main()
{
while (true)
{
NumOut(0,LCD_LINE2,MotorRotationCount(OUT_B));
}
}

Then I ran the program on my robot, and tried turning with my hand the wheel on the motor B.
Everything's ok if I turn the wheel increasing rotation degrees.
But if I reach a number >100° (for example, I reach 150°), and then I go back, it doesn't work correctly.
In fact, between 0° and 100°, it displays numbers between 0° and 1000°! For example, instead of 90°, it displays 900°!!!
It's a big problem, because I need to realize a position control.

Please, tell me if I'm doing something wrong, or fix the bug as soon as possible.

Thank you
Lorenzo

[LorenzoSabattini]

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Only one more thing: I tried release 27 and release 28, with the same results.

[John Hansen]

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What you are seeing is a bug in your little test program. You need to clear the screen before you write out the new number. Otherwise, once you have displayed

100

when it writes

90

to the screen it will be directly on top of the previous text which means that you will see

900

All you have to do in your test program is add ClearScreen(); in front of the NumOut call.