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==========
Arm-2D GPU
==========
Arm-2D is not a GPU but **an abstraction layer for 2D GPUs dedicated to
Microcontrollers**. It supports all Cortex-M processors ranging from
Cortex-M0 to the latest Cortex-M85.
Arm-2D accelerates LVGL9 with two modes: **Synchronous Mode** and
**Asynchronous Mode**.
- When **Helium** and **ACI (Arm Custom Instruction)** are available, it is recommend
to use **Synchronous Mode** to accelerate LVGL.
- When Arm-2D backed 2D-GPUs are available, for example, **DMAC-350 based 2D
GPUs**, it is recommend to use **Asynchronous Mode** to accelerate LVGL.
Arm-2D is an open-source project on Github. For more, please refer to:
https://github.com/ARM-software/Arm-2D.
How to Use
**********
In general:
- you can set the macro :c:macro:`LV_USE_DRAW_ARM2D_SYNC` to ``1`` in
``lv_conf.h`` to enable Arm-2D synchronous acceleration for LVGL.
- You can set
the macro :c:macro:`LV_USE_DRAW_ARM2D_ASYNC` to ``1`` in ``lv_conf.h`` to enable
Arm-2D Asynchronous acceleration for LVGL.
If you are using
`CMSIS-Pack <https://github.com/lvgl/lvgl/tree/master/env_support/cmsis-pack>`__
to deploy the LVGL. You don't have to define the macro
:c:macro:`LV_USE_DRAW_ARM2D_SYNC` manually, instead the lv_conf_cmsis.h will
check the environment and set the :c:macro:`LV_USE_DRAW_ARM2D_SYNC` accordingly.
Design Considerations
*********************
As mentioned before, Arm-2D is an abstraction layer for 2D GPU; hence if
there is no accelerator or dedicated instruction set (such as Helium or
ACI) available for Arm-2D, it provides negligible performance boost for
LVGL (sometimes worse) for regular Cortex-M processors.
**We highly recommend you enable Arm-2D acceleration for LVGL** when:
- The target processors are **Cortex-M55**, **Cortex-M52** and **Cortex-M85**
- The target processors support
`Helium <https://developer.arm.com/documentation/102102/0103/?lang=en>`__.
- The device vendor provides an arm-2d compliant driver for their
propriotory 2D accelerators and/or ACI(Arm Customized Instruction).
- The target device contains
`DMAC-350 <https://community.arm.com/arm-community-blogs/b/internet-of-things-blog/posts/arm-corelink-dma-350-next-generation-direct-memory-access-for-endpoint-ai>`__
Examples
********
- `A Cortex-M55 (supports Helium) based MDK Project, PC emulation is
available. <https://github.com/lvgl/lv_port_an547_cm55_sim>`__
API
***
:ref:`lv_gpu_arm2d`
|
