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Update your microcontroller VSYNC & HSYNC to be inline with displaying a 320 (column) x 240 (row) image or a 240x320 image.
In the 320x240 case, there should be 240 HSYNC pulses and for 240x320 there should be 320 HSYNC pulses.
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DT028ATFTTFT Displays How to initialize the DT028ATFT's ILI9341 driver for landscape mode with RGB interface
How to initialize the DT028ATFT's ILI9341 driver for landscape mode with RGB interface
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