ST STM32L4+ Series Reference Manual page 416

Chrom-ART Accelerator controller (DMA2D)
13 Chrom-ART Accelerator controller (DMA2D)
13.1 DMA2D introduction
The Chrom-ART Accelerator (DMA2D) 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
•
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 different pixel format and copy
the result into a part or the whole of a destination image with a different color format.
All the classical color coding schemes are supported from 4-bit up to 32-bit per pixel with
indexed or direct color mode. The DMA2D has its own dedicated memories for CLUTs (color
look-up tables).
13.2 DMA2D main features
The main DMA2D features are:
•
Single AHB master bus architecture.
•
AHB slave programming interface supporting 8/16/32-bit accesses (except for CLUT
accesses which are 32-bit).
•
User programmable working area size
•
User programmable offset for sources and destination areas expressed in pixels or
bytes
•
User programmable sources and destination addresses on the whole memory space
• Up to 2 sources with blending operation
•
Alpha value can be modified (source value, fixed value or modulated value)
• User programmable source and destination color format
•
Up to 11 color formats supported from 4-bit up to 32-bit per pixel with indirect or direct
color coding
•
2 internal memories for CLUT storage in indirect color mode
•
Automatic CLUT loading or CLUT programming via the CPU
•
User programmable CLUT size
•
Internal timer to control AHB bandwidth
•
6 operating modes: register-to-memory, memory-to-memory, memory-to-memory with
pixel format conversion, memory-to-memory with pixel format conversion and blending,
memory-to memory with pixel format conversion, blending and fixed color foreground,
and memory-to memory with pixel format conversion, blending and fixed color
background.
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