Subject:
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Re: nop in NQC?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 6 Jan 2004 23:15:19 GMT
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Viewed:
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808 times
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In lugnet.robotics, Brian Davis wrote:
> Is there a NQC command that will translate to a simple nop bytecode?
Here's a program that tries to analyze the various NOP options:
#pragma reserve 0
__nolist void NOP1() { Wait(0); }
__nolist void NOP2() { Wait(-1); }
__nolist void NOP3() { asm { 0x27, 1 }; }
__nolist void NOP4() { asm { 0x10 }; }
__nolist void NOP5() { asm { 0x14, 0, 0, 0, 0 }; }
int j, k, l, m, n, x1, x2;
task main()
{
CreateDatalog(500);
repeat (100)
{
x1 = FastTimer(0);
NOP1();
x2 = FastTimer(0);
j = x2 - x1;
AddToDatalog(j);
x1 = FastTimer(0);
NOP2();
x2 = FastTimer(0);
k = x2 - x1;
AddToDatalog(k);
x1 = FastTimer(0);
NOP3();
x2 = FastTimer(0);
l = x2 - x1;
AddToDatalog(l);
x1 = FastTimer(0);
NOP4();
x2 = FastTimer(0);
m = x2 - x1;
AddToDatalog(m);
x1 = FastTimer(0);
NOP5();
x2 = FastTimer(0);
n = x2 - x1;
AddToDatalog(n);
Wait(5);
}
}
The resulting data shows averages over 100 iterations and 6 test runs as
follows:
NOP1() NOP2() NOP3() NOP4() NOP5()
0.99 0.48 0.15 0.84 0.81
0.96 0.53 0.11 0.80 0.85
1.00 0.47 0.08 0.81 0.82
0.96 0.55 0.15 0.81 0.85
0.97 0.52 0.14 0.79 0.80
1.00 0.47 0.05 0.79 0.87
Based on this I would go with NOP3(). NOP2() is a decent second choice.
John Hansen
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Message has 1 Reply:
 | | Re: nop in NQC?
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| (...) <snipped> (...) Or you can just forget all that. I ran the same test with the order changed and the 3rd NOP of the 5 I tried was always the fastest (regardless of which one I used). Modifying the program to try each of 5 different options in (...) (21 years ago, 7-Jan-04, to lugnet.robotics)
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Message is in Reply To:
| | nop in NQC?
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| Is there a NQC command that will translate to a simple nop bytecode? I'm looking for a way to do fine-precision timing, and frankly checking a timer takes too long. For very fine motor control, I'm trying to use sequences like: On(OUT_A+OUT_C); (...) (21 years ago, 5-Jan-04, to lugnet.robotics)
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