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ssd1306
Driver for SSD1306, SSD1331, SSD1351, IL9163, ILI9341, ST7735, PCD8544, Nokia 5110 displays running on Arduino/ESP32/Linux (Rasperry) platforms
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Is the line (36 here) that I'm focusing on. In the original example, 'PB4, PA8' are replaced with '&Wire', to use the wire.h library default pins on the board. I've tried a fair few combinations of pins and references in the program, which is otherwise unmodified apart from the lines referring to using the serial port to talk to the computer being removed (lines 61 through 67), as the DFU bootloader can't talk using serial (as I have rather time consumingly learned already).
The solution was an alternative library (https://github.com/lexus2k/ssd1306) which I found through here. It just needed wired to the default pins. Got a lot more to do with the black pill, group project for a prototype ECG
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