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Latest revision as of 15:59, 22 October 2024
1. Article purpose
The purpose of this article is to:
- briefly introduce the VDEC peripheral and its main features,
- indicate the peripheral instances assignment at boot time and their assignment at runtime (including whether instances can be allocated to secure contexts),
- list the software frameworks and drivers managing the peripheral,
- explain how to configure the peripheral.
2. Peripheral overview
The VDEC (Video DECoder) peripheral is an hardware accelerator for video compressed content decoding such as H264 or VP8 bitstream and still-image content such as JPEG or WebP bitstream.
Refer to the STM32 MPU reference manuals for the complete list of features, and to the software frameworks and drivers, introduced below, to see which features are implemented.
3. Peripheral usage
This chapter is applicable in the scope of the OpenSTLinux BSP running on the Arm® Cortex®-A processor(s).
3.1. Boot time assignment
3.1.1. On STM32MP23x lines 
Click on 
to expand or collapse the legend...
| Domain | Peripheral | Boot time allocation | Comment
| |||
|---|---|---|---|---|---|---|
| Instance | Cortex-A35 secure (ROM code) |
Cortex-A35 secure (TF-A BL2) |
Cortex-A35 nonsecure (U-Boot) | |||
| Visual | VDEC | VDEC | ⬚ | |||
3.1.2. On STM32MP25x lines
Click on to expand or collapse the legend...
| Domain | Peripheral | Boot time allocation | Comment
| |||
|---|---|---|---|---|---|---|
| Instance | Cortex-A35 secure (ROM code) |
Cortex-A35 secure (TF-A BL2) |
Cortex-A35 nonsecure (U-Boot) | |||
| Visual | VDEC | VDEC | ⬚ | |||
3.2. Runtime assignment
3.2.1. On STM32MP23x lines
Click on to expand or collapse the legend...
| Domain | Peripheral | Runtime allocation | Comment
| ||||
|---|---|---|---|---|---|---|---|
| Instance | Cortex-A35 secure (OP-TEE / TF-A BL31) |
Cortex-A35 nonsecure (Linux) |
Cortex-M33 secure (TF-M) |
Cortex-M33 nonsecure (STM32Cube) | |||
| Visual | VDEC | VDEC | ⬚OP-TEE | ☑ | ⬚ | ⬚ | |
3.2.2. On STM32MP25x lines
Click on to expand or collapse the legend...
| Domain | Peripheral | Runtime allocation | Comment
| |||||
|---|---|---|---|---|---|---|---|---|
| Instance | Cortex-A35 secure (OP-TEE / TF-A BL31) |
Cortex-A35 nonsecure (Linux) |
Cortex-M33 secure (TF-M) |
Cortex-M33 nonsecure (STM32Cube) |
Cortex-M0+ (STM32Cube) | |||
| Visual | VDEC | VDEC | ⬚OP-TEE | ☑ | ⬚ | ⬚ | ||
4. Software frameworks and drivers
Below are listed the software frameworks and drivers managing the VDEC peripheral for the embedded software components listed in the above tables.
- Linux®: V4L2 framework
5. How to assign and configure the peripheral
The peripheral assignment can be done via the STM32CubeMX graphical tool (and manually completed if needed).
This tool also helps to configure the peripheral by generating:
- partial device trees (pin control and clock tree) for the OpenSTLinux software components,
- HAL initialization code for the STM32CubeMPU Package.
The configuration is applied by the firmware running in the context in which the peripheral is assigned.
See also additional information in the VDEC device tree configuration article for Linux®.
6. References