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I use the EvalBoard STM32H743i and want to have a minimum framebuffer Size. For that reason u choose the 8 bit Color Mode CM_L8. On the Display only grey scale are shown not the expected colors LCDConf.c : #define COLOR_MODE_0 CM_L8 // GUIDRV_Lin_8_API erforderlich #define COLOR_CONVERSION_0 GUICC_332 //0 xFF -> BBBGGGRR COLOR_MODE L8 (m332 bits) --------------------------- I made a test by filling the specific colors and inspect the framebuffer content GUI_SetBkColor(GUI_RED); GUI_Clear(); --> …