STM32F479 datasheet(27/91 Pages) STMICROELECTRONICS

27 / 91 page

DocID029237 Rev 2

27/91

AN4861

LCD-TFT (LTDC) display controller description

3.3.2

Programmable layer: color framebuffer

Every layer has a dedicated configurable number of lines and line length for the color

framebuffer and for the pitch.

Color framebuffer address

Every layer has a start address for the color framebuffer configured through the

LTDC_LxCFBAR register.

Color framebuffer length (size)

The line length and the number of lines parameters are used to stop the prefetching of data

from the FIFO layer at the end of the framebuffer.

The line length (in bytes) is configurable in the LTDC_LxCFBLR register.

The number of lines (in bytes) is configurable in the LTDC_LxCFBLNR register.

Color framebuffer pitch

The pitch is the distance between the start of one line and the beginning of the next line in

bytes. It is configured in the LTDC_LxCFBLR register.

Pixel input format

The programmable pixel format is used in all the data stored in the framebuffer of each

LTDC layer.

For each layer a specific pixel input format can be configured separately. The LTDC can be

configured with up to eight programmable input color formats per layer.

Figure 18 illustrates the pixel data mapping versus the selected input color format.

Figure 18. Pixel data mapping versus color format

STM32F479 Datasheet(PDF) 27 Page - STMicroelectronics