@robert-hh
from what I found in the documents of the ssd1306 the following commands are also required (or are at least different from default)
for cmd in (
MEMORY_ADDR, 0x00,
DISP_START_LINE | 0x00,
SEGMENT_MAP, 0X00,
MULTIPLEX_RATIO, 63,
Vcom_DESELECT, 0x30,
CONTRAST, 0xFF,
ENTIRE_ON,
NORM_INV,
):
anywho in the end it is a syntax problem with the I2C bus. I don't know if the correct syntax for sending long byte-array operations can be included here If it were it would have been crazy helpful for me.