Hello,
With the holiday season, I finally got some time to get out my MindStorms.
Downloaded the latest driver suite (2.4). Compiled a couple of old programs just to make sure everything was working and got two error messages. Went back to the old driver suite (1.7.1) and the errors went away. The error messages are:
undefined procedure for floor
undefined procedure for HTACreadX

I am clueless, but I took a look at the HTAC driver.
HTAC driver in 1.71 had the following lines:
bool HTACreadAllAxes(tSensors link, int &x, int &y, int &z);
bool HTACreadAllAxes(tMUXSensor muxsensor, int &x, int &y, int &z);
bool HTACreadX(tSensors link, int &x);
bool HTACreadX(tMUXSensor muxsensor, int &x);
bool HTACreadY(tSensors link, int &y);
bool HTACreadY(tMUXSensor muxsensor, int &y);
bool HTACreadZ(tSensors link, int &z);
bool HTACreadZ(tMUXSensor muxsensor, int &z);

HTAC driver in 2.4 was missing all the lines after the first line (in the above). Could this be the problem?
Using RobotC 2.02

Thanks for the help,
Dave

Hiya Dave,

There were many API changes between my 1.x and 2.x driver suites. You'll have to modify your old programs to make them work. Backwards compatibility is not guaranteed

- Xander

Hi Xander,
I see the comment in the sample program HTAC-Test1 (from 2.4): "Removed single axis functions". So that explains why the HTACreadX no longer worked. I can fix that.
I havn't been able to find what to do about the "undefined procedure 'floor'".
The error message about the flloor comes up for me even when compiling the sample program HTAC-test1 from 2.4. The comments in HTAC-test1 (2.4) say "Removed common.h from includes". The error is in common.h (line 321).

The dates and times (all from 2.4) of the three files involved are:
HTAC-test1 2011-09-06 13:52:43 (compiling this produces the floor error)
common.h 2011-11-30 19:03:16 (the floor error in in this file, line 321)
HTAC-driver.h 2011-04-27 13:00:05 (this is included in HTAC-test1)

Thanks for the help,
(I'm a bit rusty at all this),
Dave

That might be due to the fact that you're using ROBOTC 2.x. I will investigate.

- Xander

floor() is a 3.x function, so I've made a work-around for you. However, note that rounding from floats to an int doesn't work very nicely when you have a number like -0.5, which seems to be more like -0.4999999, so I've worked around that, too.



Please test this and let me know how it works for you.

Regards,
Xander

Hi Xander,
I went ahead and upgraded to 3.04 and the problem was fixed (as expected).
Thanks for the work-a-round, but upgrading to 3.04 gives a long term solution.

Merry Christmas,
Dave

Hey Dave,

The rounding error still occurs in 3.04, -0.5 is rounded to 0. I've notified the devs about it but I fear that it's inherent to using floats.

Regards,
Xander