I have a display model with bus I2C.
You display with SPI. I used the example code for I2C.
Apparently these constants different displays as even output of information you have going on is not true. The text to be displayed on the top line and not at the bottom.
You need to peek at the example in your link: www.wide.hk/download/Demo_SSD1306.rar
Compare constants and control algorithm of work with a display.
Judging from their example, they seem at first upload fonts to display or draw in graphics mode (did not go into the details.).
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