@Dennis, do you have a link to the display? Is it this one? If so, Adafruit have actually provided solder jumpers specifically so you can choose if you want I2C.
As @DrAzzy says, it shouldn't be too hard to change the driver, but then you have to choose which version of SPI you want. Some use 9 bit SPI, and some use a separate wire for Data/Command :(
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@Dennis, do you have a link to the display? Is it this one? If so, Adafruit have actually provided solder jumpers specifically so you can choose if you want I2C.
As @DrAzzy says, it shouldn't be too hard to change the driver, but then you have to choose which version of SPI you want. Some use 9 bit SPI, and some use a separate wire for Data/Command :(