Solved
When using stm32l4r9vgt chip in cubemx, ltdc RGB interface cannot be selected?
cubeMX version:6.2.1, STM32L4R9ZIT can select RGB interface,but STM32L4RVGT cann't
cubeMX version:6.2.1, STM32L4R9ZIT can select RGB interface,but STM32L4RVGT cann't
Maybe because not all RGB pins is accesibble on LQFP100 package
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