SSD1306 I2C Display on DUE

RAyWB

get following error message when compiling (DUE):

C:\Users\ADMIN\AppData\Local\Temp\arduino_build_707175\sketch\ui.cpp.o:(.data.u8g_dev_ssd1306_128x64_i2c+0x8): undefined reference to `u8g_com_null_fn'

collect2.exe: error: ld returned 1 exit status

any idea?

Repetier

Ok, have added that fuction to u8glib_ex.h so hope it compiles now.

RAyWB

OK,compiles now,works on mega/ramps but not running on DUE, even can´t get original u8glib running on due.
Think they are using their own I2C routines ?
3.3V is not the problem (tried with level shifter from 5 ->3.3 on Mega and works)
Any idea from your side?

Repetier

They are surely using own I2C and not our own version which is only used for eeprom. Due has 2 I2C sets of pins, that might be a problem.

RAyWB

I know and both are not working.
Anyway ,i was just playing around, don´t know if i find the time to search the error

geppo456

It works modifying u8glib_ex.h line #846 from
#if defined(AVR)
to
#if defined(AVR) || defined(SAM3X8E)

My setup: Ultratronics + SSD1306 on alternate i2c port (pins 70-71) + firmware 1.0.0dev
Hope it helps

RAyWB

thanks for info, i´ll check if it works on my setup

RAyWB

so you also changed ui.cpp line 947 from

u8g_InitI2C(&u8g,&u8g_dev_ssd1306_128x64_i2c,U8G_I2C_OPT_NONE);

to

u8g_InitI2C(&u8g,&u8g_dev_ssd1306_128x64_i2c,U8G_I2C_OPT_DEV_1);

?

when keeping device0(pins 20/21) there seems to be bus problems with I2C eeprom

geppo456

Yes, I changed that line also, only for board wiring aesthetic.
I verified that the display lights up connected on device0 too, but I don't have an I2C eeprom.

RAyWB

Ok, thank you for the hint , so i can use the Display now on pins70/71 , keeping my other I2C peripherals on 20/21.

may be i´ll play around with that and if i find a solution to have eeprom and Display on one Port I´ll inform you