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LTDC application examples

This section provides:

•

Some graphic implementation examples considering the resources requirements

•

An example on how to create a basic graphical application

•

A summary of STM32 reference boards with embedding LTDC and featuring an on-

board LCD-TFT panel

6.1

Implementation examples and resources requirements

This section provides some graphic implementation examples detailing the hardware

resources requirements.

6.1.1

Single chip MCU

Thanks to their integrated SRAM, the STM32 MCUs can be used for graphic applications

without the need of an external SDRAM/SRAM memory for framebuffer. Also, thanks to their

high size internal Flash (up to 2 MByte), the user can use them to store graphic primitives.

The use of internal memories allows to reduce the used pins, ease the PCB design and

make cost savings.

In order to use a single chip MCU for a graphical application, the user can use the following

hardware configuration:

•

Internal Flash up to 2 MByte: storing user application code and graphic primitives.

•

The framebuffer should be located in the internal SRAM, so depending on the internal

SRAM size for each STM32 MCU, the user can interface with a corresponding display

size and color depth as illustrated below:

–

STM32F7x7 line: use SRAM1 (368 Kbyte) to support resolutions 400 x 400 16 bpp

(313 Kbyte) or 480 x 272 16 bpp (255 Kbyte).

–

STM32F7x6 line: use SRAM1 (240 Kbyte) to support 320 x 320 resolution with

16 bpp (200 Kbyte).

–

STM32F469/F479 line: use SRAM1 (160 Kbyte) to support 320 x 240 resolution

with 16 bpp (154 Kbyte).

–

STM32F429/F439 line: use SRAM1 (112 Kbyte) to support 320 x 240 resolution

with 8 bpp (75 Kbyte).

–

STM32 MCU packages: LQFP100 or TFBGA100

Figure 31 illustrates a graphic implementation example where only a single chip with no

external memories is used.

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