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In lugnet.robotics, Philip Thompson writes:
> The following does not obey the repeat for number of times command, the
> action in the repeat loop just carries on forever.
This is interesting. When compiled with RCX2 as the target it yields:
000 pwr ABC, 7 13 07 02 07
004 dir ABC, Fwd e1 87
006 setv var[47], 3 14 2f 02 03 00
011 decvjnl var[47], 30 f3 2f 11 00
015 out A, On 21 81
017 wait 200 43 02 c8 00
021 out A, Off 21 41
023 wait 200 43 02 c8 00
027 jmpl 11 72 91 00
However, when you compile with Spybot as the target it yields:
000 pwr ABC, 7 13 07 02 07
004 dir ABC, Fwd e1 87
006 loops 3 82 02 03
009 loopcl 27 92 11 00
012 out A, On 21 81
014 wait 200 43 02 c8 00
018 out A, Off 21 41
020 wait 200 43 02 c8 00
024 jmpl 9 72 90 00
The byte codes "loops" and "loopcl" are not listed as valid LASM byte codes
in the Spybot LASM documentation. They are listed in the RCX2 LASM byte
code documentation, but the documentation says:
"It is recommended not to use this command at all since it relies on
internal state information which may become corrupted if the program
flow-of-control changes due to firmware generated events or access control
revocations. Instead use the DecVarJumpLTZero commands as they use ordinary
variables that can be manipulated in many other ways for controlled loop
termination."
It looks like this is a compiler bug (since loops and loopcl are not
supported by the Spybot and are deprecated for all programmable bricks).
> SetSensor(SENSOR_2,SENSOR_LIGHT);
SetSensor is not supported for the Spybot target. You should use
SetSensorMode(SENSOR_2, SENSOR_MODE_PERCENT);
instead. But for the Spybot the light sensor (SENSOR_2) is preconfigured in
percent mode anyway so you don't need to set its mode. SENSOR_LIGHT is a
configuration macro that combines setting a sensor type (which you cannot do
with the Spybot) and a sensor mode in one operation. The same thing applies
for SENSOR_TOUCH. See the NQC Guide for details about all this (section
3.1). (http://www.baumfamily.org/nqc/beta/NQC_Guide.pdf)
> Am I wrong in thinking that I can use these progs with a Spybot?
> or am I missing something obvious.
You can use modified versions of these programs with the Spybot. Here's
something that works with the RCX and Spybot (the Scout light sensor works
differently so this program would not work with it as written):
#define THRESHOLD 40
task main()
{
#if defined(__RCX)
SetSensor(SENSOR_2,SENSOR_LIGHT);
#endif
OnFwd(OUT_A+OUT_B);
while (true)
{
if (SENSOR_2 > THRESHOLD)
{
OnRev(OUT_B);
Wait(10);
until (SENSOR_2 <= THRESHOLD);
OnFwd(OUT_A+OUT_B);
}
}
}
Hope this helps.
John Hansen
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Message has 1 Reply:
 | | Re: Newbie NQC Spybot problems
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| "John Hansen" <JohnBinder@aol.com> wrote in message news:H92uu0.Bxz@lugnet.com... (...) codes (...) ordinary (...) in (...) do (...) applies (...) John Many thanks for the quick response. The 'repeat' problem realy had me stumped. Last time I (...) (22 years ago, 21-Jan-03, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | Newbie NQC Spybot problems
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| I'm a total newbie so please excuse stupidity! Trying to learn NQC with a Spybot and have problems. Using Bcc 3.3.3.7.1 with NQC 2.5a4 with a Lego Spybot on a Windows XP PC. The following does not obey the repeat for number of times command, the (...) (22 years ago, 21-Jan-03, to lugnet.robotics)
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