👾 MiSTer_i2c2oled 👾

Just for fun...

This Bash-Script-MiSTer-Add-On uses the DE10-Nano's i2c Interface to drive a small Display
with 128x64 Pixel showing (currently only) Pictures or Text based on the running core.
i2c2oled is currently supporting SSD1306 (0.98"), SSD1309 (2.42") and SSH1106 (1.3") OLED Displays.
Antonio Villena build IOBoards with such small SSD1306 Displays and asked for support, so here we are 🙂

!! WARNING !!

This Add-On uses the MiSTer's i2c Bus.
❗ Wrong usage can confuse the MiSTer's i2c Bus or worse ❗
You need to make sure you use the right i2c Bus as the MiSTer has more than one.

Use the command i2cdetect -l for detecting the correct i2c-Bus
and i2cdetect -y [I2CBUS] for detecting the correct i2c Address of your Display, normally 0x3C (Hex).
On my new DE10-Nano (LOT#0521) the correct I2CBUS Number is 2,
on my older DE10-Nano (LOT#0519) the correct I2CBUS Number is 1 also 2 (just checked).
Normally you get an error message if you try to run i2cdetect on the wrong Bus.

What is needed

• The DE10-Nano Board
• A SSD1306, SSD1309 or a SSH1106 OLED Display with i2c Interface
• An i2c breakout (RTC Boards or IOBoards from Antonio Villena with builtin OLED's)
  The i2c/SPI Header of the official RTC 1.3 Board has no a tiny Power Pin.
  Means you have to get the 3.3v Power from another Pin on the Board.
  See Connection Scheme RTC v1.3 for some details.
  I was sponsored by Antonio Villena with his RTC which has solder Pins for i2c and 3.3v Power.

Setup

NEW: Installer/Updater by OJAKSCH
Run the command
wget https://raw.githubusercontent.com/venice1200/MiSTer_i2c2oled/main/update_i2c2oled.sh -O /media/fat/Scripts/update_i2c2oled.sh
from the MiSTer's command line (F9) or from an SSH Session to download the i2c2oled install/update script to the MiSTer's Script Folder.
After the Script was downloaded, start it from the MiSTer's Script Menu, the MiSTer's command line (F9) or an SSH Session running the command /media/fat/Scripts/update_i2c2oled.sh.
All needed Files and Pictures are downloaded to the right places and the correct permissions are set.

▶️ Or enable the Option i2c2oled Files in update_all (see Menu-Misc).

Or (manually) check the Files&Folders Table below for which file needs to be placed in which folder on the MiSTer.
For Setting up the MiSTer for the Autostart Script of i2c2oled run once the command /media/fat/i2c2oled/S60i2c2oled setup
from cli or via ssh to enable Auto-Start of i2c2oled.

Configuration

The default configuration is configured in the file /media/fat/i2c2oled/i2c2oled-system.ini.
This file will be updated by the updater if new Options are available!

If you nedd to change the settings you can configure your User settings by adding Options and their settings
to the file /media/fat/i2c2oled/i2c2oled-user.ini.

Available Options:

• Option CONTRAST
  Set your Display's Contrast Value from "0..255", default = 100

• Option ROTATE
  Set to "true" for 180 Degree Display Rotation, default = "false"

• Option ANIMATION
  Set to -1 (default) for Random Animation, 0 for NO Animation, 1 for PressPlay, 2..5 for "Loading" Variants

• Option BLACKOUT
  Set to "yes" (default) for the short "Display-Blackout" before a Picture change, "no" = no blackout

• Option SSD1309
  Set to "yes" if you use an SSD1309 Display, "no" is default.
  This Option activates an one line offset.

• Option SSH1106
  Set to "yes" if you use an SSH1106 Display, "no" is default.
  This Option activates different Display Ram addressing .

• Option ONECOLOR
  Set to "yes" if you want to use the new "OneColor" and alternatively the "Original" Pictures with header.
  Set to "no" (default) uses only "Original" Pictures with Header.

• Option INVERTHEADER
  Set to "yes" if you want the Header of the "original" Two-Color Pictures to be inverted.
  Useful if you run an One-Color Display. "no" is default.
  This Option inverts the first 16 lines on Top.

• Option USE_RANDOM_ALT
  Set to "yes" if you want randomly chosen alternative (_altX) PIX as well.
  Set to "no" (default) if you just want to use the "normal" PIX.

• Options for the Screensaver
  SCREENSAVER="no"
  Set to yes to enable the ScreenSaver.
  SCREENSAVER_INTERVAL=10
  The Screensaver Interval in Seconds.
  SCREENSAVER_START=6
  The Screensaver starts after SCREENSAVER_START x SCREENSAVER_INTERVAL Seconds.
  SCREENSAVER_SCREENS=4
  Value how many different ScreenSaver Screens are shown.
  1=Time, 2=Time+Date, 3=Time+Date+"i2c2oled", 4=Time+Date+"i2c2oled"+"MiSTer FPGA",
  5=Time+Date+"i2c2oled"+"MiSTer FPGA"+Actual Corename

• Options for AD7414 temperature output (see below)
  SHOW_TEMP="no"
  Set to "yes" in order to show the temperature (default=no)
  SHOW_TEMP_ROW=[0..7]
  Set the row for the temperature output (default=0)
  SHOW_TEMP_COL=[0..128]
  Set the column for the temperature output (default=2)
  SHOW_TEMP_INTERVAL=[secs]
  Set the interval for the temperature output (default=1)

If you need to change the Display i2c Address add the following Option

• Option oledid
  Set your Displays i2c Address by adding the Option oledid with your Displays i2c Address.
  Example: oledid=3c
  ❗ Important, you need to add the Option oledaddr=0x${oledid} directly one line behind oledid.

Picture Locations

• /media/fat/i2c2oled/Pix
  Location of the original Pictures with 16 Pixel Line Header (for the Two-Color SSD1306 Display)
• /media/fat/i2c2oled/PRI
  Priority/Private Picture folder for the normal Two-Color Pictures.
  Will not been touched by the Updater.
• /media/fat/i2c2oled/Pix_Onecolor
  Location of the new Pictures with Footer (for One-Color Displays)
• /media/fat/i2c2oled/PRI_Onecolor
  Priority/Private Picture folder for the new One-Color Pictures.
  Will not been touched by the Updater.

How does it work

When the MiSTer boots up the script /media/fat/i2c2oled/S60i2c2oled is called.
This script does nothing more than calling the script /media/fat/i2c2oled/i2c2oled.sh
and sent it to the background, but only if /media/fat/i2c2oled/i2c2oled.sh is found and is executable.
The Script /media/fat/i2c2oled/i2c2oled.sh uses the Linux source command to load the Binary Coded Picture Data from file, if the core has changed.

The Script applies the i2c command i2cset to initialize the Display and send calculated Picture-Data to the Display.

Picture Modification:

The used Black & White Pictures are slightly modfied X-PixMap (XPM) Pictures with 128x64 Pixel.
You can create X-PixMap Pictures with Gimp or ImageMagick.
After you created the Black&White X-PixMap Picture...

🛠️ Use the XPMtoPIX conversion tool V2 by MickGyver (need .NET Core Framework 3.1+) 🛠️
Drop the folder which contains your XPM files onto the batch file XPMToPIX_normal.bat and check the result.
If you like the pictures inverted drop the folder onto the batch file XPMToPIX_inverted.bat.

or open it with an Text Editor, I use Notepad++, and do manually...

• Switch to Linux Line Ending (LineFeed only)
• Remove all text lines until the first Data Line which should contain a lot Dot's "." and Spaces like "... . . . "
• Add #!/bin/bash as the new first line
• Add logo=( before the first " (double quote) so it should look like logo=("
• Replace all Dot's "." with the Number "0"
• Replace all Spaces " " with the Number "1"
• Replace the ending }; with )
• The filename must be the same as the name of the core plus .pix as extension
  Example: Corename = C64, Filename = C64.pix
• Upload the File(s) to /media/fat/i2c2oled/Pix/ on MiSTer
• Have fun 😃

▶️ You can use the template as well.

Check your PIX against the files in https://github.com/venice1200/MiSTer_i2c2oled/tree/main/Pictures/Pix for correct modification.

>> Please make your PIX available for others <<

Slideshow/Picture Viewer:

Show all Pictures one by one
Run: /media/fat/i2c2oled/i2c2oled_slideshow.sh from ssh/cli.
The i2c2oled Daemon will be stopped before and started after the Slideshow.
Show single Picture
Run: /media/fat/i2c2oled/i2c2oled_slideshow.sh [/full/path/to/pix.pix] from ssh/cli.

Temperature Sensor Readout

...by ahmadexp

Support for temerature sensor (AD7414) readout (can be added to the RTC 1.3 board).
The i2c2oled code can support the readout of the this sensor and can overlay it on the existing image.
By default the temperature readout is not enabled to make it compatible and issue free for unsupported hardware.
In order to enable the temperature readout you need to add SHOW_TEMP="yes" to your i2c2oled-user.ini file.
You can also change the location of the value readout using SHOW_TEMP_ROW and SHOW_TEMP_COL.
In additon, you can chose how often the frequency readout gets updated (per seconds) by adjusting
the value of SHOW_TEMP_INTERVAL which by default is set to 1 update per second.
As of now that I am writing this guide, there is not ready for purchase RTC 1.3 boards with the AD7414 temperature sensor on them.
If you wish to build one youself you can purchase the RTC 1.3 board and get the AD7414 from
Digikey (https://www.digikey.com/catalog/en/partgroup/ad7414-and-ad7415/79942) or
Mouser (https://www.mouser.com/ProductDetail/Analog-Devices/AD7414?qs=5aG0NVq1C4x8PH0XK0xGUA%3D%3D) and solder it youself.
You might need a bit of soldering skils to do it right.
Please consider asking for help from a professional (like an electronic or cellphone repair shop) if you are not comfortable with the SMD soldering.
Hopefully soon we will have the RTC 1.4 with both the AD7414 as well as I2C pin headers for easier OLED epansion.
In additon, I am looking to add Temperature based Fan Speed Control to this project (future work).
If you have any further questions in this regards, please feel free rech out to @ahmadexp for more info. Stay tuned and have fun.

Files&Folders

File/Folder	Description
S60i2c2oled [1]	Starter Script, must be placed in folder /media/fat/i2c2oled/ on MiSTer
i2c2oled.sh [1]	Communication Script, must be placed in folder /media/fat/i2c2oled/ on MiSTer
i2c2oled-user.ini	User Option File, must be placed in folder /media/fat/i2c2oled/ on MiSTer
i2c2oled-system.ini	i2c2oled System File, must be placed in folder /media/fat/i2c2oled/ on MiSTer
i2c2oled_slideshow.sh [1]	Slideshow Viewer, must be placed in folder /media/fat/i2c2oled/ on MiSTer
Pictures	Just Pictures
-Pix-	See https://github.com/venice1200/MiSTer_i2c2oled_Pictures for all available PIX

Notes
[1]
Do not forget to make the three Scripts executable after copying them to the MiSTer.
Use chmod +x [scriptname] for this.

Thanks to

sorgelig for his MiSTer
https://github.com/MiSTer-devel

Antonio Villena for his RTC Board with i2c connector
https://www.antoniovillena.es

MickGyver for his XPMtoPIX conversion Tool
https://github.com/MickGyver

The following website
https://stackoverflow.com/questions/42980922/which-commands-do-i-have-to-use-ssd1306-over-i%C2%B2c
for pointing me into the right direction.

Many Thanks to the Picture Contributors ingloriond, marcelosofth and salamantecas.

...and all I forgot (Sorry!).

Links

MiSTer Forum: https://misterfpga.org
Add-On Thread : https://misterfpga.org/viewtopic.php?f=9&t=2476
MiSTer on Github: https://github.com/MiSTer-devel
mr-fitzie's pixviewer: https://venice1200.github.io/MiSTer_tty2oled_Pictures/
terminator2k2 pics: https://github.com/terminator2k2
aeronius "OneColor" pics: https://github.com/aeronius/MiSTer_Pix