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Yes, I indeed have an attachment which will act like blockage, but not a
full one though. Sounds like this is the fastest and easiest to do. I
fully understand the opcodes concept, as I myself wrote compile code before.
However, these kids age only from 10 to 14. Well, needless, I won't even
attempt to do that.
That's very interesting. Thank you very much.
----------------------------------------------------------------------------
--------
Best Regards,
Elizabeth Mabrey
> -----Original Message-----
> From: news-gateway@lugnet.com
> [mailto:news-gateway@lugnet.com] On Behalf Of Steve Hassenplug
> Sent: Monday, December 05, 2005 9:47 AM
> To: lugnet.robotics.rcx.robolab@lugnet.com;
> lugnet.robotics.rcx.legos@lugnet.com
> Subject: Re: avoid messaging
>
> On Mon, December 5, 2005 8:58 am, Elizabeth Mabrey wrote:
> > Hi
> >
> > In order to avoid unwanted interruption, such as remote • shutdown, from
> > other RCX during execution time, I wonder if the only thing can be
> > done to safe-guard my RCX will be having an independent task
> > dedicated to receive message (mail). This, of course, • might be quite time consuming to the RCX.
> > I wonder if there is anyone out there using the same • hacking method
> > and observe any negative impact to the actual working task. • Or, the
> > negative impact may be negligible. Or, perhaps there is better and
> > smarter way to do this.
>
>
> If you have an event waiting for a message, I doubt it will
> have much impact on the speed of the rest of the program.
>
> However, this will not catch the messages you're looking for.
> You can't use the "mail" function to receive op-code, such
> as power off.
>
> A real quick intro to op-codes: (I don't have all the exact
> numbers, so this may not be 100% correct, and this is really
> not that quick...)
>
> When you send an op-code to the standard firmware, it should
> be of the format:
> 0x55,0xff,0x00,
> [command],[command_complement],
> [optional_argument],[optional_argument_complement],
> [check-sum],[check-sum_complement]
>
> The first three numbers (the header) tell the RCX the
> following message is something it should listen to (an op-code)
>
> The next two are the command, and the complement of the
> command. The command is a number, usually written in hex,
> like 0x60 or as a decimal, like 96. The complement is FF (or
> 255 dec) minus the command. The RCX uses this value to make
> sure the data is valid.
>
> After the command, there may be arguments, and their complements.
>
> Finally, is the check-sum (sum of command and arguments) and
> the complement of that sum.
>
> Clear as mud? :)
>
> So, if you send a message (mail) value of "3", the complete
> message that's sent via IR would be something like:
> 0x55, 0xff, 0x00, (header)
> 0xf7 (command to send message), 0x08 (complement),
> 0x03 (message to send), 0xfc (complement),
> 0xfa (checksum), 0x05 (complement)
>
> If you want to send a power off command:
> 0x55, 0xff, 0x00, (header)
> 0x60 (command to power off), 0x9f (complement),
> 0x60 (checksum), 0x9f (complement)
>
> The robolab mailbox will only receive the 'f7' command, which
> tells it to store the argument in the mailbox.
>
> With BrickOS, you can change the message handler, so your
> program can receive all messages (op-codes). But it's not as
> clear and easy as using Robolab.
>
>
> You should build a wall in front of your IR window. :)
>
> Steve
>
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Message has 1 Reply:
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 | | Re: avoid messaging
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| (...) If you have an event waiting for a message, I doubt it will have much impact on the speed of the rest of the program. However, this will not catch the messages you're looking for. You can't use the "mail" function to receive op-code, such as (...) (21 years ago, 5-Dec-05, to lugnet.robotics.rcx.robolab, lugnet.robotics.rcx.legos)
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