October 2017 DocID029937 Rev 2 1/22
1
AN4943
Application note
Using the Chrom-ART Accelerator™ to refresh an LCD-TFT
display on STM32L496xx/L4A6xx/L4Rxxx/L4Sxxx microcontrollers
Introduction
The purpose of this application note is to highlight how to refresh an LCD-TFT display via
the FSMC interface using the Chrom-ART Accelerator™ on
STM32L496xx/L4A6xx/L4Rxxx/L4Sxxx microcontrollers.
The STM32L496xx/L4A6xx/L4Rxxx/L4Sxxx microcontrollers implement a Chrom-Art
Accelerator™ (DMA2D) that is a specialized DMA dedicated to image manipulation.
It can perform the following operations:
• Filling a part or the whole of a destination image with a specific color
• Copying a part or the whole of a source image into a part or the whole of a destination
image with a pixel format conversion
• Blending a part and/or two complete source images with a different pixel format and
copying the result into a part or the whole of a destination image with a different color
format.
On the STM32L496xx/L4A6xx/L4Rxxx/L4Sxxx microcontrollers, the flexible static memory
controller (FSMC) is used to access the LCD-TFT display through a parallel interface.
This application note explains on:
• How to connect the LCD-TFT display to the FSMC interface
• How to configure the DMA2D for the LCD-TFT display refresh
• How to use the DMA2D byte reordering features to directly drive Intel 8080 displays.
To fully benefit from this application note, the user should be familiar with the STM32
Chrom-ART Accelerator™ (DMA2D) as described in the STM32L4x6 advanced Arm
®
-
based 32-bit MCUs reference manual (RM0351) and the STM32L4Rxxx/L4Sxxx advanced
Arm
®
-based 32-bit MCUs reference manual (RM0432) available from the
STMicroelectronics website www.st.com.
Table 1. Applicable products
Type Product lines and part numbers
Microcontrollers
STM32L496AE, STM32L496AG, STM32L496QE, STM32L496QG,
STM32L496RE, STM32L496RG, STM32L496VE, STM32L496VG,
STM32L496ZE, STM32L496ZG
STM32L4A6AG, STM32L4A6QG, STM32L4A6RG, STM32L4A6VG,
STM32L4A6ZG
STM32L4R5/S5 line, STM32L4R7/S7 line, STM32L4R9/S9 line
www.st.com
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