STM32F479 datasheet(55/91 Pages) STMICROELECTRONICS

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Creating a graphical application with LTDC

An example of LTDC configuration using STM32CubeMX is described in Section 6.2.4:

LTDC peripheral configuration.

Pixel clock and timings configuration

At this stage of the graphical application development, the user should have already

checked and confirmed that the desired display size and color depth are compatible with the

hardware configuration. Therefore, the pixel clock to be configured should be already

known, either extracted from display datasheet or calculated (see Section 4.2.2: Checking

display compatibility considering the memory bandwidth requirements).

Example: LTDC timings configuration for ROCKTECH RK043FN48H display

embedded on the STM32F746G-DISCO board

At first, the user should extract the timing parameters from the display’s datasheet (see

Table 14). It is recommended to use typical display timings.

Table 14. LCD-TFT timings extracted from ROCKTECH RK043FN48H datasheet (1)

1. The gray cells highlight the values used in the example presented below.

Item

Symbol

Min.

Typ.

Max.

Unit

DCLK frequency

Fclk

MHz

DCLK period

Tclk

110

200

Hsync

Period time

490

531

605

DCLK

Display period

Thdisp

480

DCLK

Back porch

Thbp

DCLK

Front porch

Thfp

DCLK

Pulse width

Thw

DCLK

Vsync

Period time

275

288

335

Display period

Tvdisp

272

Back porch

Tvbp

Front porch

Tvfp

Pulse width

Tvw

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