Official PlatformIO + Arduino IDE support for the Raspberry Pi Pico is now available!

[lnlp]

Solved:

@lnlp

I have tried to use U8g2 with SSD1306 OLED display.
Even this already gives errors.

The advantage of Arduino is that (nowadays) it is cross platform.
It should be possible to run many popular examples and libraries (that are not architecture specific) on any Arduino core.
If this is not possible than the port of the Arduino framework to that architecture is not (yet) successful i.m.o. and possibly still a long way to go.

• I2C compilation issue:

  I fixed the issue with I2C (‘OLED display’):

  Strange enough SDA and SCL are not defined in the Arduino-embed core.
  I used definitions I2C_SDA and I2C_SCL instead which are defined in the BSP but they could not be resolved during compilation. I now use the PIN_WIRE_SDA and PIN_WIRE_SCL definitions instead which works fine:

#ifndef SDA
    #define SDA PIN_WIRE_SDA
#endif    
#ifndef SCL
    #define SCL PIN_WIRE_SCL
#endif

• Compilation issues caused by include file named “pico.h”

  My other issues with Arduino framework and Raspberry Pi Pico have also been solved:

  I got many errors during compilation of which I did not understand what was causing them. It appeared to be an include file in my application called pico.h with include guard #ifndef PICO_H_. It turned out that the Arduino-embed core uses an include file with exactly the same name and same header guard.
  Changing only the name of my header guard proved to be insufficient, even while I explicitly included my pico.h file from a specific folder. I had to rename my own pico.h include file to something else (and rename the header guard accordingly).
  After this my problem was solved and the code compiled successfully.