STM32F479 datasheet(45/91 Pages) STMICROELECTRONICS

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AN4861

Creating a graphical application with LTDC

pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;

pLayerCfg.Alpha = 255;

pLayerCfg.Alpha0 = 0;

pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;

pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR1_PAxCA;

/* Framebuffer start address: LTDC fetches the image directly from internal

Flash the real image width is 448 pixels. Only the 448 pixels width is

displayed*/

pLayerCfg.FBStartAdress = (uint32_t)&image_data_Image_RGB888_448x272;

pLayerCfg.ImageWidth = 448;

pLayerCfg.ImageHeight = 272;

pLayerCfg.Backcolor.Blue = 0;

pLayerCfg.Backcolor.Green = 0;

pLayerCfg.Backcolor.Red = 0;

if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)

{

Error_Handler();

}

Figure 26. Reducing layer window and framebuffer line widths

•

Add a number of dummy bytes at the end of every line of pixels to match the closest

frame line width multiple of 64 bytes. This can be done using the LTDC layer pitch (see

Section 3.3: Two programmable LTDC layers). To do this, the user must consider the

two points below:

–

The framebuffer should contain the dummy bytes (as described in Figure 27):

when writing data into the framebuffer, it can be done by programming an output

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