 | | Re: semaphores
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a short example: #include <semaphore.h> // for semaphore opperations // global buffer, used to store incoming messages. // the buffer is checked by the application waiting for the message. struct inn_msg{ char *msg; sem_t lock; }; //create a (...) (23 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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| | semaphores
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Does anyone have any code that implements semaphores and shows where they might be useful? That is one place that the documentation seems a little weak. Thanks, Sam (23 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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| | Re: ___cmpsi2
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(...) Had to look myself to belive it. But you are right, cmpsi2 is in the 0.2.6 system, but not in the 0.2.5 system. (...) No, that are the wrong ones. You need the lib functions for the cross compiled code. libgcc.a is code that gcc needs on your (...) (23 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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| | Re: ___cmpsi2
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(...) I don't find cmpsi2 in the sources of LegOS 0.2.5 (in lib/mint)! I found a _cmpsi2.o in libgcc.a (from egcs 1.1.2), but I really don't know how gcc (and ld) uses that library. The makefiles come from the LegOS tarball. According to the output, (...) (23 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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| | Re: ___cmpsi2
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(...) cmpsi2 is part of the libmint.a library. Would you please post (or send me) your source code and your Makefile? Regards, Mike (23 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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| | ___cmpsi2
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Using a multiplication between an int (in my case time_t) and a double number results in the following error: main.o(.text+0x72):main.c: undefined reference to `___cmpsi2' Can someone help me? I'm running egcs 1.1.2 and binutils 2.12. Eric (23 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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| | Re: Powered Sensors
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Ok, I have gotten myself confused again. 0-0.32mA represents a voltage dropbetween 0 - 3.2 volts. Therefore the voltage that the RCX "reads" on theA2D is between 5 - 1.8 volts (1023 - 368 RAW)? To get a reading of 0 (RAW)it seems as though you would (...) (23 years ago, 8-May-02, to lugnet.robotics.rcx.legos)
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| | Re: Converting a float to an integer
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(...) float f = 1.4; int i = (int)((i >= 0) ? i + 0.5 : i - 0.5); OR if (f >= 0) i = (int)(i + 0.5); else i = (int)(i - 0.5); This is assuming you want to round to the nearest integer. Just curious, where are you getting the ascii strings that you (...) (23 years ago, 8-May-02, to lugnet.robotics.rcx.legos)
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| | Converting a float to an integer
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Hopefully this isnt a silly question. Does anyone know how to covert a float to an integer? It doesn't appear that the function atoi exists. Michael. (23 years ago, 7-May-02, to lugnet.robotics.rcx.legos)
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| | Re: Powered Sensors
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----- Original Message ----- From: "John Barnes" <barnes@sensors.com> Newsgroups: lugnet.robotics.rcx.legos Sent: Tuesday, May 07, 2002 2:23 PM Subject: Re: Powered Sensors (...) the (...) across (...) Ok... lets see if I understand this.... For (...) (23 years ago, 7-May-02, to lugnet.robotics.rcx.legos)
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| | Re: Powered Sensors
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No, the RCX knows nothing about the diodes. That is why devices like the light sensor only send a current signal in the range 0 - 0.32mA back to the RCX. This current then creates a voltage drop across the 10k reference resistor with respect to the (...) (23 years ago, 7-May-02, to lugnet.robotics.rcx.legos)
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| | Powered Sensors
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Hello all, I recently purchased "Extreme Mindstorms - An Advanced Guide to LEGO Mindstorms" and I must say it is one of the best books out there for the power user. I have a number of questions regarding powered sensors. First of all, when the RCX (...) (23 years ago, 7-May-02, to lugnet.robotics.rcx.legos)
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| | Re: Next test version avail. 0.2.6.05 - have time?
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(...) I'm not sure if that's a good idea. Of course, they can always be a compiler switch to turn them off if you don't want them. The thing is, though, that there are lots of tradeoffs between speed, memory use, and accuracy in this kind of (...) (23 years ago, 6-May-02, to lugnet.robotics.rcx.legos)
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| | Re: Next test version avail. 0.2.6.05 - have time?
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Ok, this brings up an interesting question... What is the best way to use LNP with windows? the version of WinLNP that I see is _ancient_ and requires VC++ to work.... so I see that there is a linux version, I was wondering it would be possible to (...) (23 years ago, 6-May-02, to lugnet.robotics.rcx.legos)
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| | Re: cygwin messed up?
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Jason, There is a problem within the Makefile logic atleast with some windows OS. What OS are you trying it on? I submitted a bug to the legOS project on sourceforge ((URL) and submitted a suggestion for a fix here ((URL) is happening (atleast on my (...) (23 years ago, 6-May-02, to lugnet.robotics.rcx.legos)
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| | Next test version avail. 0.2.6.05 - have time?
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We are looking for help testing our next very-early integration. We have revised the LNP support and have reworked the support for the LEGO Infrared Remote Control to create this 2nd test version. This version mimicks the stock firmware behavior. (...) (23 years ago, 6-May-02, to lugnet.robotics.rcx.legos)
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| | Re: cygwin messed up?
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You can try a few things with the makefile.common in the util directory and change the tool prefix from cc to gcc. Later u might have another error related to ld at that point u'll have to put the extension .exe in front of ld in one of the (...) (23 years ago, 6-May-02, to lugnet.robotics.rcx.legos)
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| | cygwin messed up?
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i'm running the lates version of cygwin and i'm trying to follow the instructions at (URL) but, when i try to make depend i get some errors: $ make depend for i in util lib boot demo ; do c:/djgpp/bin/make.exe NODEPS=yes -C $i depend || exit 2 ; (...) (23 years ago, 5-May-02, to lugnet.robotics.rcx.legos)
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| | Re: tty problem
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(...) try this: ../util/firmdl3 --tty=usb legOS.srec (23 years ago, 5-May-02, to lugnet.robotics.rcx.legos)
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| | tty problem
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Hello, I have recently downloaded the legos-0.2.6 version and have built it under windows Cygwin. when I give the command being in the boot directory where legOS.srec is export RCXTTY=USB ../util/firmdl3 legOS.srec it says USB: No such file or (...) (23 years ago, 5-May-02, to lugnet.robotics.rcx.legos)
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