 | | Re: LeJos threads / sleep() takes too long
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The priority mechanism used in lejos is the same as that specified in the Real Time Specification for Java (RTSJ): Threads of a higher priority will absolutely block threads of a lower priority as long as they remain runnable. The sensor listener (...) (24 years ago, 1-Apr-02, to lugnet.robotics.rcx.java)
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| | Re: RCX as a PGP engine
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(...) Definitely post it! Better than that, how about sending me the code and I'll add it to our robots section as a unique demonstration. (...) Shouldn't be a problem. Most of the source code in the official Sun package is easy to port to leJOS. (...) (24 years ago, 19-Mar-02, to lugnet.robotics.rcx.legos, lugnet.robotics.rcx.java)
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| | Re: RCX as a PGP engine
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(...) I just 'ported' (euphemism for minor modifications) some code lingering on the web for fun and voila: MD5 on RCX is up and running (lejos). If anyone's interested, I can post the code. It allows for authentication (PC sends random challenge, (...) (24 years ago, 18-Mar-02, to lugnet.robotics.rcx.legos, lugnet.robotics.rcx.java)
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| | Re: Reading exceptions
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(...) The 0078 is the method signature number of the method where the exception was thrown. The 8, is the least significant figure of the number referring to the exception class thrown. To get further information, you must add the -verbose option to (...) (24 years ago, 12-Mar-02, to lugnet.robotics.rcx.java)
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| | Book on Programming the RCX with Java
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If anyone would like more information on the new book "Core Lego Mindstorms Programming" check out my announcement on Lugnet: (URL) (24 years ago, 12-Mar-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.java)
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| | Reading exceptions
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Hello, I've recently started working with lejOS and was having some dificulty with my code. When ever I get an exception, there is a buzz, the arrow under the 2 lights up, and a number like "0078 8" shows up. I was wondering how I read this number (...) (24 years ago, 11-Mar-02, to lugnet.robotics.rcx.java)
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| | Re: RCX as a PGP engine
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(...) They don't, but they need bignums (really big integers). (...) the API is in java.math.BigInteger . (...) You could just run PPP over it I suppose, with some encryption (IPSec?) on top of it. Would be dead slow, though. The charm of the RCX (...) (24 years ago, 10-Mar-02, to lugnet.robotics.rcx.legos, lugnet.robotics.rcx.java)
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| | Re: LeJos threads / sleep() takes too long
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Hi Bart, (...) if you mean LISTENER_THREAD then that sounds plausible. (...) Yes, LISTENER_THREAD has maximum priority, so it runs before any threads of lower priority, even yield doesn't help. (...) Yes, I think we'll have to fix that somehow. (...) (24 years ago, 6-Mar-02, to lugnet.robotics.rcx.java)
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| | LeJos threads / sleep() takes too long
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Experimenting with Lejos, two 'major' problems: memory (cleaning up platform & lang: Math.class is huge!) and... threads. I have the impression my "try { sleep(nnn) }" takes a somewhat arbitrary time. It's 'at least' nnn milisec, but often much (...) (24 years ago, 6-Mar-02, to lugnet.robotics.rcx.java)
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| | Re: Communication between 2 Robots - Movement transmition
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I did something simple in my book where each robot had an angle sensor, and could copy each other's 1D movement. Some grad students at Tufts did the same thing with 2 angle sensors on each robot and 2D movement. Both projects also then expanded to (...) (24 years ago, 27-Feb-02, to lugnet.robotics.rcx.java)
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