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