PW4 force the E-ink screen to refresh？？

kdusr · 09-19-2021, 06:50 AM

I'm working on a kindle info display app, however I'm having trouble with screen afterimage on the kindle when the text is updated. Is there any com.lab126 or Linux command that will force the E-ink screen to refresh?

j.p.s · 09-19-2021, 11:22 AM

Code:

eips ''

or

Code:

fbink -s

Some recalcitrant kindles might need:

Code:

fbink -f -s

(The -f does a flash to black before refreshing.)

kdusr · 09-20-2021, 11:00 AM

thanks J.P.S,
eips ' ' works on my kindle, but I can not find "fbink" command on KOA, KO2 and PW4

NiLuJe · 09-20-2021, 11:49 AM

It's bundled with USBNet (and, well, itself ;p).

j.p.s · 09-20-2021, 02:24 PM

Quote:

Originally Posted by kdusr

thanks J.P.S,
eips ' ' works on my kindle

When I wrote my post, I didn't have access to my kindle with heavy ghosting. I tried it this morning and eips '' had no effect, nor did fbink -s

When I ran
fbink -f -s
it worked perfectly. Maybe some firmware version and model combinations need an extra shove.

NiLuJe · 09-20-2021, 04:47 PM

You do need `-f` to request a flash (everywhere)

.

Otherwise, the default waveform mode (and every mode that's not a `GCn`, for that matter) will not even touch pixels that haven't changed since the last refresh.

j.p.s · 09-20-2021, 05:42 PM

Quote:

Originally Posted by NiLuJe

You do need `-f` to request a flash (everywhere)

.

Otherwise, the default waveform mode (and every mode that's not a `GCn`, for that matter) will not even touch pixels that haven't changed since the last refresh.

I'm sure it's because of some shortcoming on my part, but it just doesn't come through to me while staring at the --refresh documentation in https://github.com/NiLuJe/FBInk/blob/master/CLI.md that --flash is required for anything to happen for cases when there is no change to the framebuffer.

NiLuJe · 09-20-2021, 06:02 PM

That's because it doesn't say that outright

. It's already a giant wall of text, so it's assuming the reader has a basic understanding of the technicalities involved in stuff that isn't directly related to the behavior of the CLI itself and/or of FBInk itself.

The API doc, on the other hand, delves into the guts of things (e.g., this would be the relevant bit, as well as the bit about AUTO that explains that flash + AUTO means GC16 in FBInk. There are even more details about that particular design choice in the code

.)).

When in doubt, check the API doc, it's much more detailed, and much better contextualized

.

09-19-2021, 06:50 AM	#1
kdusr Connoisseur Posts: 85 Karma: 13 Join Date: Oct 2016 Location: Mars Device: KV,KOA2,PW5	force the E-ink screen to refresh？？ I'm working on a kindle info display app, however I'm having trouble with screen afterimage on the kindle when the text is updated. Is there any com.lab126 or Linux command that will force the E-ink screen to refresh?

09-19-2021, 11:22 AM	#2
j.p.s Grand Sorcerer Posts: 5,780 Karma: 103362673 Join Date: Apr 2011 Device: pb360	Code: eips '' or Code: fbink -s Some recalcitrant kindles might need: Code: fbink -f -s (The -f does a flash to black before refreshing.) Last edited by j.p.s; 09-20-2021 at 02:27 PM. Reason: Add -f option to fbink command.

09-20-2021, 11:00 AM	#3
kdusr Connoisseur Posts: 85 Karma: 13 Join Date: Oct 2016 Location: Mars Device: KV,KOA2,PW5	thanks J.P.S, eips ' ' works on my kindle, but I can not find "fbink" command on KOA, KO2 and PW4 Last edited by kdusr; 09-20-2021 at 10:14 PM.

09-20-2021, 06:02 PM	#8
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	That's because it doesn't say that outright . It's already a giant wall of text, so it's assuming the reader has a basic understanding of the technicalities involved in stuff that isn't directly related to the behavior of the CLI itself and/or of FBInk itself. The API doc, on the other hand, delves into the guts of things (e.g., this would be the relevant bit, as well as the bit about AUTO that explains that flash + AUTO means GC16 in FBInk. There are even more details about that particular design choice in the code .)). When in doubt, check the API doc, it's much more detailed, and much better contextualized . Last edited by NiLuJe; 09-20-2021 at 06:05 PM.

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09-20-2021, 11:49 AM	#4
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	It's bundled with USBNet (and, well, itself ;p).

09-20-2021, 04:47 PM	#6
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	You do need `-f` to request a flash (everywhere) . Otherwise, the default waveform mode (and every mode that's not a `GCn`, for that matter) will not even touch pixels that haven't changed since the last refresh.

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