Strange bevavior of ssd1306 Display

[bed]

Let me share my investigation and telling about mystery:
Anobiums Win Hex File does nothing, me be because chip ferequency is set to 64 an my board has no Quartz.
I soldered one of the two displays with 2k7 Pullup, nothing changed.
Resitance without any connectione between gnd and sca/scl about 4MegOhms.
Now comes the surprise.
When flashing the (wrong) 64 pix version, it runs direct (6 Seconds delay) after flash.
When I disconnect power and PicKit I shortcircuit the Vcc-GND like the hint from Joseph. Reconnect 5V again, waiting 6 Seconds and the Display shows the Text, but 180° reverse! Upside down but it is readable, like it would be now in the correct 32 pix state.

Same prodecudre with 32 mode, nothting happens.
btw: When I set Constant LCD_TYPE_SSD1306_CHARACTER_MODE_ONLY
none of the two modes are functional.

And it is by far darker. This phaenomene had I watch for my earliest tries before, also, when powering only with 5V. (Yes the Voltage is 5.22Volts constant)

  'Set internal clock speed to 4 MHz:
    Set IRCF0 = 1
    Set IRCF1 = 0
    Set IRCF2 = 1

did not change anything.

[Anobium]

Try this. Copy and paste, test.

    #chip 18f25k20, 16
    #option explicit

    #define I2C_MODE Master
    #define I2C_DATA PORTC.4
    #define I2C_CLOCK PORTC.3

    #include <glcd.h>
    #define GLCD_TYPE GLCD_TYPE_SSD1306_32  'for 128 * 32 pixels support
    #define GLCD_I2C_Address 0x78
    #define vccstate 0

    #define GLCD_TYPE_SSD1306_CHARACTER_MODE_ONLY

    GLCDCLS
    GLCDPrint 0, 0, "Great Cow BASIC"
    GLCDPrint 0, 16, "Anobium 2017"

[bed]

Sorry, nothing on the display

[Joseph Realmuto]

It's sounding to me like a problem I had with some of these displays. Basically, I put a delay of 255 ms at the start of the initialization procedure to allow the power supplies time to stabilize. That fixed the problem. The delay would be right at the beginning of the InitGLCD_SSD1306 subroutine in SSD1306.h:

Sub InitGLCD_SSD1306

    'Colours //Set these first
    GLCDBackground = 0
    GLCDForeground = 1
    GLCDFontWidth = 6
    GLCDfntDefault = 0
    GLCDfntDefaultsize = 1

'need delay here to allow power supplies to stabilize
wait 255 ms

 #IFDEF HI2C_DATA
         HI2CMode Master
         Wait 15 ms  'wait for power-up and reset
 #ENDIF

 #ifdef S4Wire_DATA
      dir MOSI_SSD1306 Out
      dir SCK_SSD1306 Out
      dir DC_SSD1306 Out
      dir CS_SSD1306 Out
      dir RES_SSD1306 Out
      RES_SSD1306 = 0
      wait 10 us
      RES_SSD1306 = 1
    #endif

   'Setup code for SSD1306 controllers
    'Init sequence for 128x64 OLED module
    Write_Command_SSD1306(SSD1306_DISPLAYOFF)                    ' 0xAE

    Write_Command_SSD1306(SSD1306_DEACTIVATE_SCROLL)
    Write_Command_SSD1306(SSD1306_SETDISPLAYCLOCKDIV)            ' 0xD5
    Write_Command_SSD1306(0x80)                                  ' the suggested ratio 0x80

    Write_Command_SSD1306(SSD1306_SETMULTIPLEX)                  ' 0xA8
    #if GLCD_HEIGHT = 64
      Write_Command_SSD1306(0x3f)                                 '64 pixels
    #endif

    #if GLCD_HEIGHT = 32
      Write_Command_SSD1306(0x1f)                                 '32 pixels
    #endif

    Write_Command_SSD1306(SSD1306_SETDISPLAYOFFSET)              ' 0xD3
    Write_Command_SSD1306(0x00)                                   ' no offset

    Write_Command_SSD1306(SSD1306_SETSTARTLINE | 0x00)            ' line #0
    Write_Command_SSD1306(SSD1306_CHARGEPUMP)                    ' 0x8D

    if (vccstate = SSD1306_EXTERNALVCC) then
      Write_Command_SSD1306(0x10)
    else
      Write_Command_SSD1306(0x14)
    end if

    Write_Command_SSD1306(SSD1306_MEMORYMODE)                    ' 0x20
    'Write_Command_SSD1306(0x00)                                  ' 0x00 act like ks0108 - DO NOT SELECT!!
    Write_Command_SSD1306(0x10)                                  ' 0x01 act like PCD8544

    Write_Command_SSD1306(SSD1306_SEGREMAP | 0x1)
    Write_Command_SSD1306(SSD1306_COMSCANDEC)
    Write_Command_SSD1306(SSD1306_SETCOMPINS)                    ' 0xDA

    #if GLCD_HEIGHT = 64
      Write_Command_SSD1306(0x12)                                 '64 pixels
    #endif

    #if GLCD_HEIGHT = 32
      Write_Command_SSD1306(0x02)                                 '32 pixels
    #endif

    Write_Command_SSD1306(SSD1306_SETCONTRAST)                   ' 0x81
    if vccstate = SSD1306_EXTERNALVCC then
      Write_Command_SSD1306(0x9F)
    else
      Write_Command_SSD1306(0xCF)
    end if
    Write_Command_SSD1306(SSD1306_SETPRECHARGE)                  ' 0xd9
    if vccstate = SSD1306_EXTERNALVCC then
      Write_Command_SSD1306(0x22)
    else
      Write_Command_SSD1306(0xF1)
    end if

    Write_Command_SSD1306(SSD1306_SETVCOMDETECT)                 ' 0xDB
    Write_Command_SSD1306(0x40)

    Write_Command_SSD1306(SSD1306_DISPLAYALLON_RESUME)           ' 0xA4
    Write_Command_SSD1306(SSD1306_NORMALDISPLAY)                 ' 0xA6

   'Clear screen Here
    GLCDCLS_SSD1306

    Write_Command_SSD1306(SSD1306_DISPLAYON)                     '--turn on oled panel

End Sub

[bed]

Hi Joseph, wait 255 ms does not help :-(

[Anobium]

Case placed on Hold.

This is a LINUX compiler bug. I have asked for the files to examine this issue in detail.

Please do not comment further.

[Anobium]

The root cause is the Linux Distribution not the SSD1306 or any component library.

The Linux distribution of v0.98.00 RC1 will be replaced. The files have been resolved with respect the errors reported. Please only use v0.98.00 RC2 of the Linux Distribution.

The Linux distribution of v0.98.00 RC1 should not be used any further.

Anobium

[bed]

Congrats and thanks to evan and Joe, they are doing a superior job here. Best I hire them for my employer ;-)

btw: the 6 Secondswait is gone, and reset issue also!!

[stan cartwright]

These displays stop working after a few weeks sometimes, static, cloudy day,duff soldering...takes a while to realise it's broken. I buy 5 at a time.

[bed]

Oh, that's odd. Yes I'have 3 pieces, always buy som more as the Customs barrier will allow