Subject:
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Re: Op-code question
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 12 May 2001 14:22:15 GMT
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Viewed:
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745 times
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In article <002301c0dad9$55be30e0$b3d0adcb@ferrari.com>, "Evan Woo"
<evanwoo@ihug.co.nz> wrote:
> Hi,
> With regard to the op-code
> (http://graphics.stanford.edu/~kekoa/rcx/opcodes.html) for set motor
> power (13/1b), there are three parameters:
>
> byte motors: Bit field to specify up to three motors
> byte source: Source type for power level. Only 0, 2, and 4 allowed
> byte argument: Argument for power level
>
> Can someone explain to me what is the parameter "source"? What are the
> values 0, 2 and 4 for? It seems it only works properly when I pass the
> value 2.
There are lots of different data sources in the rcx...
0 - variables
1 - timers
2 - constants
4 - random numbers
etc.
A lot of opcodes have arguments that are coded as source/value pairs.
In this case, if you want to specify the argument as a constant value,
you'd use source 2. If you wanted the opcode to read a variable, then
use source 0 and put the variable number in the instruction.
When using the 1.0 firmware, there are lots of limitations on the valid
sources for specific opcodes. The 2.0 firmware is a lot less
restrictive.
Dave
--
reply to: dbaum at enteract dot com
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Message is in Reply To:
 | | Op-code question
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| Hi, With regard to the op-code ((URL) for set motor power (13/1b), there are three parameters: byte motors: Bit field to specify up to three motors byte source: Source type for power level. Only 0, 2, and 4 allowed byte argument: Argument for power (...) (24 years ago, 12-May-01, to lugnet.robotics)
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