FBInk: A small tool/library to print crap on your screen!

[BloodRagg]

Damn, that's nice mate . I'm gonna do some testing, see how things work out on my end

EDIT: Not allowed to give any karma, must spread Reputation or some shit

[sherman]

I was looking at tslib the other day, wondering how useful it would be. My concerns were mainly regarding calibration, how to do it on eink, and whether the calibration results could be shared on all devices of the same model.

[NiLuJe]

Well, it certainly works once you add the requisite eInk refreshes, but I didn't look into the calibration format in detail, although it *should* be re-usable across like-minded devices ;p.

There may be some rotation shenanigans to handle to make the automagic rotation correction behave properly (for instance, I had to run the calibration tool without setting the rotation, because of the H2O inverted rotation quirk, otherwise the calibration tool tried to set the current rotation, which ends up throwing us in the inverted one, which means the base rotation stored in the calibration file is wrong, if that matters, which I imagine it might ;p).

Again, that was from a *very* quick test, because I only had a passing interest in seeing how viable that could be. It probably is, just needs a bit more work (and/or check how it deals with gesture detection and the more esoteric variants of the touch protocol).

The calibration tool itself is dead simple: one by one, it shows a cross near the four corners (TL -> TR -> BR -> BL), and then at the center of the screen, and waits for you to tap (ideally, on the cross ;p).

[BloodRagg]

Somehow I cant get it compiled , using the kobo/linaro 4.9.4

git clone https://github.com/NiLuJe/FBInk
cd FBInk; rmdir libunibreak font8x8 stb
git clone https://github.com/adah1972/libunibreak
git clone https://github.com/NiLuJe/font8x8
git clone https://github.com/NiLuJe/stb
make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm

[frostschutz]

to clone the repository you only need the first command, if you add --recurse option (or was it --recursive)

it compiles for me, but I compile it directly on the Kobo (Debian Jessie chroot, gcc 4.9.2) so it may be different to using a cross-compiler.

actually I do have to add a cflag (-std=c11) to make it work at all and then it warns about unknown pragma.

fbink.c:65:10: warning: unknown option after '#pragma GCC diagnostic' kind [-Wpragmas]
 # pragma GCC diagnostic ignored "-Wduplicated-branches"
          ^

but the result seems to work fine then

[NiLuJe]

What @frostschutz said, plus the triplet variable should be called CROSS_TC, not CROSS_COMPILE, and should *not* contain the trailing dash (because this is tailored for my own TCs).

You'll probably indeed need to enforce -std=gnu11 with GCC 4.9, as that's the minimum requirement .

I'll try to silence those pragma warnings, since disabling an option that doesn't exist yet is pretty harmless .

I do have a 4.9 TC laying around, I'll take a look later tonight.

[BloodRagg]

Originally Posted by frostschutz

to clone the repository you only need the first command, if you add --recurse option (or was it --recursive)

it compiles for me, but I compile it directly on the Kobo (Debian Jessie chroot, gcc 4.9.2) so it may be different to using a cross-compiler.

actually I do have to add a cflag (-std=c11) to make it work at all and then it warns about unknown pragma.

fbink.c:65:10: warning: unknown option after '#pragma GCC diagnostic' kind [-Wpragmas]
 # pragma GCC diagnostic ignored "-Wduplicated-branches"
          ^

but the result seems to work fine then

Hey man, thanks that did the trick.

Originally Posted by NiLuJe

What @frostschutz said, plus the triplet variable should be called CROSS_TC, not CROSS_COMPILE, and should *not* contain the trailing dash (because this is tailored for my own TCs).

You'll probably indeed need to enforce -std=gnu11 with GCC 4.9, as that's the minimum requirement .

I'll try to silence those pragma warnings, since disabling an option that doesn't exist yet is pretty harmless .

I do have a 4.9 TC laying around, I'll take a look later tonight.

I set the flag and the TC option, now everything compiles just dandy

git clone --recurse-submodules https://github.com/NiLuJe/FBInk
export CFLAGS="$CFLAGS -std=gnu11"
make CROSS_TC=arm-linux-gnueabihf ARCH=arm

And poof, a working binary

[NiLuJe]

Ooh, those were some highly cryptic and verbose warnings indeed ;p.

Fixed it so the std flag gets automagically enforced where it's needed (GCC < 5.1), and silenced that pragma warning .

Also added a bit of hand-holding for really old kernel headers, even if that wasn't an issue in practice, because that was for button_scan, which is Kobo specific, and my crappy old kernel headers were from Kindle kernels .

[BloodRagg]

I feel like a moron asking this, but I'm doing it anyway:

@frostschutz: How did you know to use this flag ?

@NiLuJe: Why is it gnu11 and not c11 ?

EDIT: Test script is almost done, it seems to be working properly

[NiLuJe]

Mostly because as this is Linux-only, I'm likely to be using/expecting GNU extensions somewhere, and that's what GCC's default std values always use anyway: the GNU variant .

[BloodRagg]

Originally Posted by NiLuJe

Mostly because as this is Linux-only, I'm likely to be using/expecting GNU extensions somewhere, and that's what GCC's default std values always use anyway: the GNU variant .

Ahh

Something else, when i run: "fbink -c -qe" it does not clear the screen
I use the output from fbink and have to run it again to also perform a clearscreen.

[BloodRagg]

That was a nice little challenge but it works like a charm

Here is a proof of concept: (see attachment below)

#!/bin/sh
trap './fbink -cq' 0 1

IFS=$'\n;';export $(./fbink -c -qe);IFS=
./fbink -cqm -y1 "Testing '-E' flag by BloodRagg"

touched(){
  IFS=$'\n;';local $1;IFS=
  [ $ntxRotaQuirk -eq 1 ] && { x=$((screenHeight-x)) ; y=$((screenWidth-y));}
  [ $x -ge $lastRect_Left -a $x -le $(( lastRect_Left + lastRect_Width )) ] || return 1
  [ $y -ge $lastRect_Height -a $y -le $(( lastRect_Top  + lastRect_Height )) ] || return 1
  echo true;return 0
}

get_touch_event(){
  dd if=/dev/input/event1 count=2 2>/dev/null|\
   hexdump -ve '8/2 "%d " "\n"'|\
   awk '{if ($6==0 && $7!=0) {print "x="$7}};{if ($6==1) {print "y="$7}}'
}

ON=$(./fbink -E -x1 -M -S6 "ON")
OFF=$(./fbink -E -x-4 -M -S6 "OFF")
EXIT=$(./fbink -E -x-5 -y-2 -S6 "EXIT")

while true ;do
  eval $(get_touch_event)
  case true in
    $(touched $ON)) ./fbink -qg file=lamp_on.jpeg,halign=CENTER,valign=CENTER;;
    $(touched $OFF)) ./fbink -qg file=lamp_off.jpeg,halign=CENTER,valign=CENTER;;
    $(touched $EXIT)) exit;;
  esac
done

[NiLuJe]

@BloodRagg: Yeah, never thought that would ever be used like that . Fixed it .

[BloodRagg]

Working like a charm

[NiLuJe]

Released v1.16.0!

Mostly minor tweaks here and there, and a few new features as discussed earlier .