(r26) OledDisplay < MecrispCube

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I really like the neat little OLED displays. They are crisp and draw only some miliamps. Cheap OLED display have a resolution 128x32 that's enough for about 4 lines and 20 characters.

Driver [[https://github.com/spyren/Mecrisp-Cube/blob/master/Forth/Src/oled.c][oled.c]], fonts from https://www.mikrocontroller.net/topic/54860.

[[https://en.wikipedia.org/wiki/Code_page_850][Code page 850]]

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---+ OLED and !I2C Words

=oled-emit= works like the standard word =emit=. It blocks the calling thread, as long as the character is not written to the OLED display (less than 300 us for a 6x8 character and 400 kHz !I2C). Horizontal (x) position is in pixel (0 to 127), vertical position (y) is in lines, a line consists of 8 pixels. Larger fonts takes more than one line.

<pre>
oled-emit    ( Char -- )        Emits a character (writes a character to the OLED display)
oled-emit?   ( -- Flag )        OLED ready to get a character (I2C not busy)

hook-emit    ( -- a-addr )      Hooks for redirecting terminal IO on the fly
hook-emit?   ( -- a-addr )    

oledpos!     ( x y -- )         Set OLED cursor position, 
                                x horizontal position, for 6x8 font max. (128 / 6) -1, depends on the font's x size 
                                y vertical position (a line consists of 8 pixels), max. 3 for 128x32 or 7 for 128x64 displays.
oledpos@     (  -- x y )        Get the current OLED cursor position
oledcmd      ( c-addr -- )      Send command to the OLED controller SSD1306. First byte contains the length of the command.
oledclr      (  --  )           Clears the OLED display, sets the cursor to 0, 0
oledfont     ( u --  )          Select the font, u: 0 6x8, 1 8x8, 2 8X16 , 3 12X16

I2Cdev       ( u -- )           Sets the 7-bit I2C address
I2Cput       ( c-addr u -- )    c-addr buffer address for the message with lengh u to send
I2Cget       ( c-addr u -- )    c-addr buffer address for the message to receive
I2Cputget    ( a1 u1 a2 u2 -- ) a1 buffer address for the message to send, a2 buffer address for the message to receive

>oled        ( -- addr1 addr2 ) redirect to oled
>term        ( addr1 addr2 -- ) terminate redirection
</pre>

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---+ Usage

It is easy to redirect the terminal output to the OLED display, to use the string formatting words.
<pre>
: oled-hallo (  -- )
  hook-emit @              \ save emit hook
  ['] oled-emit hook-emit ! \ redirect terminal to oled-emit
  ." Hallo Velo! " cr
  ." ciao"
  hook-emit !         \ restore old hook
;
</pre>

or even simpler
<pre>
: oled-hallo (  -- )
  >oled         \ redirect terminal to oled-emit
  ." Hallo Velo! " cr
  ." ciao"
  >term         \ terminate redirection
;
</pre>

or on a command line
<pre>
>oled .( Hallo Velo!) >term
</pre>

show date and time on OLED (see CmsisRtos#How_to_use_Tasks for a background task).
<pre>
: clock (  -- )
  oledclr
  3 oledfont
  -1 -1 -1 alarm!  \ set an alarm every second
  begin
    wait-alarm     \ wait a second
    0 0 oledpos!
    >oled .time >term
  key? until
  key drop
;
</pre>



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---+ Links

---++ SSD1306 Driver

---+++ Driver SW
   * U8g2 https://github.com/olikraus/
   * STM32 Graphical User Interface TOUCHGFX https://www.st.com/content/st_com/en/stm32-graphic-user-interface.html
   * https://lexus2k.github.io/ssd1306/ https://github.com/lexus2k/ssd1306
   * https://github.com/bitbank2/ss_oled
   * SSD1306xLED https://git.x2software.net/pub/GameCounter/-/tree/master/Source/lib/ssd1306xled

---+++ Other OLEDs with SSD1306 
   * OLED B click 96x39 mono https://www.mikroe.com/oled-b-click, SSD1306
      * !I2C address 60 / 0x3c or SPI
      * Manual [[https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf][SSD1306]]
      * https://learn.adafruit.com/adafruit-pioled-128x32-mini-oled-for-raspberry-pi
      * Manual [[https://download.mikroe.com/documents/datasheets/ssd1351-revision-1.3.pdf][SSD1351]]
         * Idles at low CPOL=0  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW
         * CPHA=0 hspi1.Init.CLKPhase = SPI_PHASE_1EDGE

   * Adafruit 128x64 Bonnet 
      * https://learn.adafruit.com/adafruit-128x64-oled-bonnet-for-raspberry-pi/overview
      * https://pinout.xyz/pinout/i2c# 

   * Adafruit !FeatherWing 128x32 OLED
      * https://www.adafruit.com/product/2900

   * https://www.lcd-module.de/fileadmin/pdf/grafik/oledm128-6.pdf

   * Octopus
      * https://www.distrelec.ch/de/octopus-128x64-oled-display-pi-supply-pis-1277/p/30163414 

---++ SH1107 Driver


[[https://cdn-learn.adafruit.com/assets/assets/000/094/580/original/SH1107_datasheet.pdf][SH1107 Datasheet]]

https://www.displayfuture.com/Display/datasheet/controller/SH1107.pdf

https://github.com/adafruit/Adafruit_CircuitPython_DisplayIO_SH1107/blob/main/adafruit_displayio_sh1107.py

!FeatherWing 128x64 OLED
   * https://www.adafruit.com/product/4650
   * Schematics https://learn.adafruit.com/assets/94578
   * I2C address selector D11 (JP3.6 
   

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-- %USERSIG{PeterSchmid - 2020-12-29}%

<a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br />This work by <a xmlns:cc="http://creativecommons.org/ns#" href="http://spyr.ch" property="cc:attributionName" rel="cc:attributionURL">Peter Schmid</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
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I	Attachment	History	Action	Size	Date	Who
png	Codepage-850.png	r1	manage	2.4 K	2021-01-05 - 21:21	PeterSchmid
jpg	oled-mecrisp-cube-header.jpg	r1	manage	66.2 K	2021-01-02 - 22:14	PeterSchmid
jpg	oled-mecrisp-cube.JPG	r1	manage	5100.2 K	2021-01-02 - 22:14	PeterSchmid
Topic revision: r26 - 2021-11-20 - PeterSchmid