Jivelite on Alpine Linux

[sodface]

Ok, duh, I installed libjpeg-turbo and things improved dramatically! No crashing and I'm getting album art. I'll let it run over night. Now to get touch working. I think I'm going to have recompile SDL against tslib. Do I need to just recompile SDL or jivelite also?

alps:/usr/lib# ldd /usr/lib/libSDL-1.2.so.0.11.4 
	/lib/ld-musl-armhf.so.1 (0xb6f45000)
	libc.musl-armhf.so.1 => /lib/ld-musl-armhf.so.1 (0xb6f45000)

This is the screen I'm working with. Seems like it will be pretty nice once I get it all together. I've had touch working using the tslib utilities and now seem to have jivelite working - next is to get them together!

It has a 3.5mm audio jack, which is audio split off the HDMI and run through a 4334 KSZ Cirrus Logic DAC. I've tested it with squeezelite and a pair of headphones just to see if it works and it does. Haven't really done any critical listening, I'm not under illusions, it's an ancient, inexpensive DAC chip. I'm not too fussy though so if it sounds decent to my ears I might just use it and not worry about using a DAC board.

Also pictured is the project box I'm going to try to use. Mounting the screen to the angled side should make it about right for comfortable operation and viewing.

[sodface]

Touch is actually working so I'm not sure what the ldd check above means. Calibration is off in Jivelite even after running ts_calibrate. I guess that's the next issue to resolve.

[ralphy]

There is no way to know what was causing the segfault without building a debug version of jivelite and running it in gdb. Even then if the crash is happening within the lua interpreter it becomes even harder to track down.

Calibration in jivelite won't work unless libSDL 1.2 was compiled with libts support. That should be the only library you need to recompile. I helped chill through this for the joggler.

[sodface]

There is no way to know what was causing the segfault without building a debug version of jivelite and running it in gdb. Even then if the crash is happening within the lua interpreter it becomes even harder to track down.

Calibration in jivelite won't work unless libSDL 1.2 was compiled with libts support. That should be the only library you need to recompile. I helped chill through this for the joggler.

Thanks for the support Ralphy, recompiling sdl as we speak. I think the seg fault was just due to not having libjpeg-turbo installed.

//edit Ralphy, will jivelite pickup the tslib support from the newly compiled SDL or do I need to recompile jivelite also?

[sodface]

Well the recompiled SDL seems to be working with tslib. Touch point accuracy is good but it's just constantly bringing up the context menu like I've done a long click instead of just a tap. Probably a knob that needs turning in /etc/ts.conf? I'll mess with it more tomorrow. I'm starting to second guess the screen a little, it seems a little dark.

[sodface]

Ok thanks to Ralphy, Jeff, Chill, et al, this is now working quite well, though the screen brightness (lack of) probably is what it is.

My currently working settings:

alps:/home/sodface# cat /etc/ts.conf 
# generated by libts
module_raw input (null)
module pthres pmin=1
module dejitter delta=100
module linear (null)
module skip nhead=2

Starting Jivelite with:

export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_PLUGINDIR=/usr/lib/ts
export SDL_MOUSEDRV=TSLIB
export SDL_MOUSEDEV=$TSLIB_TSDEVICE 
export JIVE_NOCURSOR=1
/opt/jivelite/bin/jivelite

Alpine includes the file usercfg.txt at the end of config.txt, they want you to leave config.txt alone:

alps:/home/sodface# cat /media/mmcblk0/usercfg.txt 
gpu_mem=128
dtparam=audio=on
hdmi_cvt=800 480 60 6
hdmi_group=2
hdmi_mode=87
hdmi_drive=2

[ralphy]

That's great!

Too bad about the brightness. Hopefullly, you find a way to improve it.

[sodface]

Here's the "prototype" (that's what I'm calling it so I don't feel so bad about the botched execution) player based on the Uctronics 5" touchscreen, pi zero, squeezelite and jivelite on Alpine Linux. I'm probably going to rip it apart and redo it all in a couple of weeks when I come back from work travel.

It's setup on a little folding camp table for the photo op, now sitting on my desk.

[sodface]

I had a second one of these Uctronics 5" screens, it's as dark and dull as the other one. This is with Alpine x86_64 on a Wyse 3030 thin client.

[sodface]

A few notes to self on getting the x86_64 working:

Coaxing Alpine to set the correct screen resolution took me a bit longer than I'd like to admit. The default grub command line has "nomodeset" which I don't think actually does anything for this specific device (Wyse 3030) with the i915 based video I think you also have to add "i915.modeset=0" to really disable KMS, so the resolution kept getting set to 1920x1080 which resulted in tiny text on the 800x480 Uctronics 5" display. I added the video= argument to the grub command line:

jl-01:~# cat /etc/default/grub 
GRUB_TIMEOUT=2
GRUB_DISABLE_SUBMENU=y
GRUB_DISABLE_RECOVERY=true
GRUB_CMDLINE_LINUX_DEFAULT="modules=sd-mod,usb-storage,ext4 nomodeset quiet rootfstype=ext4 video=800x480M@60mD"

jl-01:~# grub-mkconfig -o /boot/grub/grub.cfg

To start Jivelite on boot, I ended up with what feels like an ugly solution, but it is working. I commented out the existing tty1 line in /etc/inittab and added the /bin/login one per an entry I found in the Alpine wiki:

#tty1::respawn:/sbin/getty 38400 tty1
tty1::respawn:/bin/login -f root

So this auto logs in root, then I have a .profile file in /root that runs a jivelite.sh script:

jl-01:~# cat /root/.profile 
/root/jivelite.sh &

The jivelite.sh script figures out which device the touchscreen is, since it's not the same every boot, sets some env variables, clears and blanks the framebuffer and starts jivelite:

jl-01:~# cat jivelite.sh 
#!/bin/sh
for dev in /dev/input/event* 
do
  tsdev=$(ts_finddev ${dev} 1 2> /dev/null)
  if printf "${tsdev}" | grep -q caught 
  then
    break
  fi
done

fbset -g 800 480 800 480 32
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=${dev}
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_PLUGINDIR=/usr/lib/ts
export SDL_MOUSEDRV=TSLIB
export SDL_MOUSEDEV=$TSLIB_TSDEVICE 
export JIVE_NOCURSOR=1
dd if=/dev/zero of=/dev/fb0
/usr/bin/jivelite &

This in addition to the calibration and ts.conf edits documented above. As I said, feels ugly, but it's booting up to Jivelite without user intervention. There must be a better way to determine the touchscreen device file, but that's what I came up with for now.