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Hi Sven, I spent a few weeks debugging my code and trying to figure out what was wrong. I found a decent number of other changes I had to make but still no success. With the cache enabled, the screen was displaying a bunch of random garbage. After probing up the SPI lines I found that the data being sent was the same as the data at the VRAM address 0x0000000. I have no clue as to why emWIN would read from this location. Was I supposed to set the address for VRAM? VRAM is not mentioned for the FL…

@Berger Was any resolution reached for this? I have been trying to use emWIN with the GC9A01 controller with no success.

Does emWIN work with the GC9A01 Driver? I am switching from a parallel screen to a 4-line SPI screen that uses the GC9A01 controller but so far have had no luck. I am using GUIDRV_FLEXCOLOR_F66709 with GUIDRV_FLEXCOLOR_M16C1B8 because there is no read operation supported with the GC9A01.