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STM32F479 数据表(PDF) 28 Page - STMicroelectronics |
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STM32F479 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 91 page  LCD-TFT (LTDC) display controller description AN4861 28/91 DocID029237 Rev 2 Figure 19 summarizes all layer color framebuffer configurable parameters. Figure 19. Programmable color layer in framebuffer Pixel format conversion (PFC) After being read from the framebuffer, the pixel data is transformed from the configured pixel input format to the internal ARGB8888 format. The components that have a width of less than 8 bits get expanded to 8 bits by bit replication. The 8 MSB bits are chosen. Figure 20 shows a conversion from RGB565 input pixel format to the internal ARGB8888 format. Figure 20. Pixel format conversion from RGB565 input pixel format to the internal ARGB8888 format Note: Using two layers creates bandwidth constraints on the system. It is preferable to use only one layer and to do the composition with the Chrom-Art Accelerator® during the framebuffer calculation (see Section 4.2.2: Checking display compatibility considering the memory bandwidth requirements). |
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