I searched in the forum and i got many threads on the same topic. which create some confusion in my mind.
Then i took example from STM32 library examples. After compliation i got error. Following are the error.
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In file included from C:\Users\ajink\Documents\Arduino\my\oled\oled\oled.ino:1:0: C:\Users\ajink\Documents\Arduino\hardware\Arduino_STM32-master\STM32F1\libraries\Adafruit_SSD1306/Adafruit_SSD1306_STM32.h:38:26: fatal error: Adafruit_GFX.h: No such file or directory #include <Adafruit_GFX.h> ^ compilation terminated. exit status 1 Error compiling for board Generic STM32F103C series.
Is it hardaware I2C or bit bang?