Virtual Streaming Interface (VSI)

Data streaming interface. More...

Content
	VSI API
	Virtual Streaming Interface API for application firmware.
	VSI Python interface
	VSI python interface.
	VSI Use Cases
	Use Cases for Virtual Streaming Interface (VSI)

Description

Data streaming interface.

The Virtual Streaming Interface (VSI) is a flexible memory-mapped peripheral available in AVH FVP models. It can be used to simulate data streaming interfaces such as audio, video, and various sensors often found in IoT and machine learning (ML) applications. The VSI is provided in 8 independent instances that can be used in parallel for multi-channel input/ouput interfaces.

The figure below illustrates the concept behind the VSI on AVH FVP models.

Using the Virtual Streaming Interface (VSI)

• On the application firmware side a peripheral driver uses the VSI registers in the FVP model to simulate peripheral operation for a target use case. By relying on common driver APIs the same application-level code can be tested on an FVP model or a real hardware target.
• Read/write accesses to the VSI peripheral registers in the FVP trigger execution of corresponding callback functions in the VSI Python scripts that implement peripheral behavior in the target scenario.
• An FVP model can be run on a host OS and executes the target firmware application image. The path to the VSI python scripts is provided to the FVP using the configuration parameter v_path. Section Running User Applications in CLI gives an example.

Section VSI Use Cases explains in detail the reference implementations of VSI-based peripherals. Specifically Audio via VSI implementing audio streaming input from a local audio wave file and Video via VSI implementing video streaming from a local video or image file.

Access to the VSI peripherals is defined in the following files:

File	Description
./interface/include/arm_vsi.h	VSI API header file
./interface/python/arm_vsi0.py	VSI Python interface script template for instance 0
:	:
./interface/python/arm_vsi7.py	VSI Python interface script template for instance 7

An example flow for using the VSI peripheral is shown on the figure below:

Example flow for using the VSI peripheral