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Use of FW stabilisation patch size doubles the number of patches [Not a Bug]

 
Author ebr9999
DPS
#1 | Posted: 7 Mar 2024 16:28 
For other reasons, I have been verifying the patches sent to Pgenerator and noted something that looks strange to me.
I have checked with the buit-in 24 patches grey ramp.
1) With no stabilisation I see 27 patches (the expected 24, plus 3 black identical patches at the end. One is issued after having acknowledged the end of the characterisation message. Maybe 2 patches in excess, but anyhow very minor issue.
2) With a no FS stabilisation, I see 52 patches (the expected 48 patches, plus, at the beginning, the last measured patch is resent, and, at the end, 3 black patches are issued. I guess it depends on some SW streamlining, but, anyhow negligible.
3) With a FS stabilisation, I see 100 patches (the expected 48 patches are doubled to 96, and the one at the beginning and the 3 at the end are still there).
Let me show the dump of these extra patches:

a) stabilisation patch:
FIRST
0000 e4 5f 01 de 65 3b 2c 3b 70 ec f6 7d 08 00 45 00 ._..e;,;p..}..E.
0010 00 66 81 39 40 00 80 06 f5 e8 c0 a8 01 15 c0 a8 .f.9@...........
0020 01 0a e1 16 00 55 82 5f d3 97 fb a2 9a f7 50 18 .....U._......P.
0030 10 01 76 6c 00 00 52 47 42 3d 52 45 43 54 41 4e ..vl..RGB=RECTAN
0040 47 4c 45 31 30 62 69 74 3b 31 39 32 30 2c 31 30 GLE10bit;1920,10
0050 38 30 3b 30 3b 34 34 39 2c 34 34 39 2c 34 34 39 80;0;449,449,449
0060 3b 30 2c 30 2c 30 3b 30 2c 30 2c 30 2c 30 3b 2d ;0,0,0;0,0,0,0;-
0070 31 02 0d 0a 1...

SECOND
0000 e4 5f 01 de 65 3b 2c 3b 70 ec f6 7d 08 00 45 00 ._..e;,;p..}..E.
0010 00 68 81 3b 40 00 80 06 f5 e4 c0 a8 01 15 c0 a8 .h.;@...........
0020 01 0a e1 16 00 55 82 5f d3 d5 fb a2 9a fb 50 18 .....U._......P.
0030 10 01 44 d2 00 00 52 47 42 3d 52 45 43 54 41 4e ..D...RGB=RECTAN
0040 47 4c 45 31 30 62 69 74 3b 35 37 36 2c 33 32 34 GLE10bit;576,324
0050 3b 30 3b 34 34 39 2c 34 34 39 2c 34 34 39 3b 30 ;0;449,449,449;0
0060 2c 30 2c 30 3b 30 2c 30 2c 36 37 32 2c 33 37 38 ,0,0;0,0,672,378
0070 3b 2d 31 02 0d 0a ;-1...

Basically, there is a first FS patch (449,449,449), followed, after the patch measurement, by a no FS stabilisation patch.

b) Patch:
FIRST
0000 e4 5f 01 de 65 3b 2c 3b 70 ec f6 7d 08 00 45 00 ._..e;,;p..}..E.
0010 00 66 81 cd 40 00 80 06 f5 54 c0 a8 01 15 c0 a8 .f..@....T......
0020 01 0a e1 16 00 55 82 5f eb 9e fb a2 9c 7f 50 18 .....U._......P.
0030 0f ff 4b d9 00 00 52 47 42 3d 52 45 43 54 41 4e ..K...RGB=RECTAN
0040 47 4c 45 31 30 62 69 74 3b 35 37 36 2c 33 32 34 GLE10bit;576,324
0050 3b 30 3b 36 34 2c 38 35 32 2c 36 34 3b 30 2c 30 ;0;64,852,64;0,0
0060 2c 30 3b 30 2c 30 2c 36 37 32 2c 33 37 38 3b 2d ,0;0,0,672,378;-
0070 31 02 0d 0a 1...

SECOND
0000 e4 5f 01 de 65 3b 2c 3b 70 ec f6 7d 08 00 45 00 ._..e;,;p..}..E.
0010 00 64 81 cf 40 00 80 06 f5 54 c0 a8 01 15 c0 a8 .d..@....T......
0020 01 0a e1 16 00 55 82 5f eb dc fb a2 9c 83 50 18 .....U._......P.
0030 0f ff 7c ef 00 00 52 47 42 3d 52 45 43 54 41 4e ..|...RGB=RECTAN
0040 47 4c 45 31 30 62 69 74 3b 31 39 32 30 2c 31 30 GLE10bit;1920,10
0050 38 30 3b 30 3b 36 34 2c 38 35 32 2c 36 34 3b 30 80;0;64,852,64;0
0060 2c 30 2c 30 3b 30 2c 30 2c 30 2c 30 3b 2d 31 02 ,0,0;0,0,0,0;-1.
0070 0d 0a ..

Basically, I see first the the right patch (64,852,64) and then a FS patch with still 64,852,64. From a timing perspective that second FS patch is sent close before the next FS stabilisation patch.

I cannot tell if it applies to other patch generators (Bug?) and if it comes from the compatibility need with other PG's (WIBNI?), anyhow unnecessary patches are sent.

Author Steve

INF
Male
#2 | Posted: 7 Mar 2024 18:22 
This is as expected, because the calibration patch size, and the stabilisation patch size are different.
When size changes, a patch is sent, and when the colour changes, a patch is sent.
The two 'changes' cannot be sent simultaneously.

And this has nothing to do with PGen, just for info.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author ebr9999
DPS
#3 | Posted: 7 Mar 2024 18:57 
I understand it depends on the way CS works, but filtering, in this case, no FS stabilisation patches and FS patches would save unnecessary IP traffic. By the way CS listen to Pgenerator responses, so also that is doubled.

Author Steve

INF
Male
#4 | Posted: 7 Mar 2024 19:08 
Indeed, it is how ColourSpace works.
And yes, you requested the change to listen for an Ok from PGen... and that is PGen specific.

Steve
Steve Shaw
Mob Boss at Light Illusion

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 Use of FW stabilisation patch size doubles the number of patches [Not a Bug]

 

 
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