SSD1309 2.42” OLED interface

I have code working for interfacing the nRF52 DK board to a SSD1309 based 2.42” OLED display. 

The problem is with getting the correct indexing for lines and columns. 

Can anyone share code functions for

SSD1309 initialization 

Small font definition (5x8)

Write text to display line

Clear display 

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