Writing variables to papirus

[plagergren]

I am writing some lua code that has the following where float is a floating point number: floater = tostring(float) os.execute(sudo paprius-textfill 'floater')

and this works fine except I want the value of floater to display not the word "floater" I have tried a lot of different ways to do what I want including grep and all kinds of folderol. Nothing works so far. I get all kinds of different errors depending on which code du jour I am using. How do I assign a value and print it to the papirus screen using textfill? Actually, what I really want to do is to use screen.partial_update to refresh only part of the screen that has changed.

Thanks!

[tvoverbeek]

@plagergren floater is already a string. Try with os.execute('papirus-textfill '..floater) .. is the lua string concatenation operator. For papirus sudo is not needed unless you have an old version of Raspbian. Here a sample lua test program which works for me:

for val=1.0,2.0,0.1 do
   cmd='papirus-textfill '..tostring(val)..' 180'
   os.execute(cmd)
   os.execute('sleep 1')
end

The 180 is for rotating the image on the display. For partial updates you either need some python glue or implement it directly in lua. See the papirus-clock example for how to use papirus.partial_update().

[plagergren]

HI Ton,

Got my code working except for one thing - I can't get partial_update to work. When I started using it I got error messages of several kinds but all clustered around 'command not found' which isn't a surprise. However, this lua code does not cause an error:

floater = string.format("$07.1f"float) cmd = "papirus-textfill"..floater os.execute(cmd) -- this works splendidly float = float + 1.0 floater = string.format("$07.1f"float) cmd = "partial_update() "..floater -- this does not generate a "not found" error os.execute(cmd) -- this has no effect on the display

After looking at the papirus-clock code I am curious if the reason I'm not seeing any activity from partial_update is because I am not treating the displayed numbers as an image. Does partial_update work on text or only on images?

Best regards,

Peter

From: "Ton van Overbeek" notifications@github.com To: "PiSupply/PaPiRus" PaPiRus@noreply.github.com Cc: "LAGERGREN" lagergren@shaw.ca, "Mention" mention@noreply.github.com Sent: Sunday, December 9, 2018 12:23:50 PM Subject: Re: [PiSupply/PaPiRus] Writing variables to papirus (#201)

@plagergren floater is already a string. Try with os.execute('papirus-textfill '..floater) .. is the lua string concatenation operator. For papirus sudo is not needed unless you have an old version of Raspbian. Here a sample lua test program which works for me: for val=1.0,2.0,0.1 do cmd='papirus-textfill '..tostring(val)..' 180' os.execute(cmd) os.execute('sleep 1') end

The 180 is for rotating the image on the display. For partial updates you either need some python glue or implement it directly in lua. See the papirus-clock example for how to use papirus.partial_update().

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub , or mute the thread .

[tvoverbeek]

@plagergren The papirus example programs use the papirus python module as interface between the low level driver (the epd_fuse service) and the program. In principle all commands are sent to files in /dev/epd. You would have to implement the papirus module in lua to get a pure lua implementation. If you can call a python script from lua you could write a small one which does the partial_update and call that from your lua program. You will have to dive into the low level details to get this working.

[plagergren]

Thanks! I'll dive into it and see where it takes me. Pete ----- Original Message ----- From: Ton van Overbeek notifications@github.com To: PiSupply/PaPiRus PaPiRus@noreply.github.com Cc: plagergren lagergren@shaw.ca, Mention mention@noreply.github.com Sent: Fri, 14 Dec 2018 12:38:58 -0700 (MST) Subject: Re: [PiSupply/PaPiRus] Writing variables to papirus (#201)

@plagergren The papirus example programs use the papirus python module as interface between the low level driver (the epd_fuse service) and the program. In principle all commands are sent to files in /dev/epd. You would have to implement the papirus module in lua to get a pure lua implementation. If you can call a python script from lua you could write a small one which does the partial_update and call that from your lua program. You will have to dive into the low level details to get this working.

-- You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub: https://github.com/PiSupply/PaPiRus/issues/201#issuecomment-447432523

[plagergren]

Hi Ton,

I've been playing around with the papirus and one of the things I see is that the partial update examples are all images. I am displaying ascii numbers using the papirus-texfill which works just fine from lua. However, it seems that I can't do a partial update because the displayed figures are not images. Do I need to convert the text to an image before I can do a partial update?

Thanks in advace

Peter

From: "Ton van Overbeek" notifications@github.com To: "PiSupply/PaPiRus" PaPiRus@noreply.github.com Cc: "LAGERGREN" lagergren@shaw.ca, "Mention" mention@noreply.github.com Sent: Friday, December 14, 2018 1:38:58 PM Subject: Re: [PiSupply/PaPiRus] Writing variables to papirus (#201)

@plagergren The papirus example programs use the papirus python module as interface between the low level driver (the epd_fuse service) and the program. In principle all commands are sent to files in /dev/epd. You would have to implement the papirus module in lua to get a pure lua implementation. If you can call a python script from lua you could write a small one which does the partial_update and call that from your lua program. You will have to dive into the low level details to get this working.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub , or mute the thread .

[tvoverbeek]

@plagergren Yes, all text displayed is first made as an image using the Python Image Library and then copied to the PaPiRus. I just updated papirus-textfill on github with an option to use partial-update. Here is the new help:

usage: papirus-textfill [-h] [--rotation ROTATION] [--partialupdate]
                        displaytext

positional arguments:
  displaytext           Text to display (max 40 char)

optional arguments:
  -h, --help            show this help message and exit
  --rotation ROTATION, -r ROTATION
                        Rotation one of 0, 90, 180,270
  --partialupdate, -p   Use partial instead of full update

Just replace your copy of papirus-textfill with the current one on github and use the '-p' option.

PS Your name sounds scandinavian. Swedish? If so Lycka till

[plagergren]

Hej Tom,

Tak so mykjet!

I was born in Pitea and emigrated to the states when I was 5 so tragically I’ve lost my Swedish language ability. Not that a 5 year old has much. Hej do! ----- Original Message ----- From: Ton van Overbeek notifications@github.com To: PiSupply/PaPiRus PaPiRus@noreply.github.com Cc: plagergren lagergren@shaw.ca, Mention mention@noreply.github.com Sent: Thu, 27 Dec 2018 08:22:08 -0700 (MST) Subject: Re: [PiSupply/PaPiRus] Writing variables to papirus (#201)

@plagergren Yes, all text displayed is first made as an image using the Python Image Library and then copied to the PaPiRus. I just updated papirus-textfill on github with an option to use partial-update. Here is the new help:

usage: papirus-textfill [-h] [--rotation ROTATION] [--partialupdate]
                        displaytext

positional arguments:
  displaytext           Text to display (max 40 char)

optional arguments:
  -h, --help            show this help message and exit
  --rotation ROTATION, -r ROTATION
                        Rotation one of 0, 90, 180,270
  --partialupdate, -p   Use partial instead of full update

Just replace your copy of papirus-textfill with the current one on github and use the '-p' option.

PS Your name sounds scandinavian. Swedish? If so Lycka till

-- You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub: https://github.com/PiSupply/PaPiRus/issues/201#issuecomment-450170722