Virtual Input/Output (VIO)

Controls simple I/O such as LED and switches. More...

Content
	Python environment
	Python environment for Arm FVPs.
	VIO API
	Virtual Input/Output (VIO) API.
	VIO Python interface
	VIO python interface.
	Using VIO
	Using Virtual I/O Interface (VIO)

Description

Controls simple I/O such as LED and switches.

The Virtual Input/Output Interface (VIO) implements a register-based peripheral for simple digital I/Os. It can be used to simulate control of such items as LEDs, switches, digital signals and others. Figure below demonstrates the concept.

The following files define the access to the VIO peripheral.

File	Description
./interface/include/arm_vio.h	VIO API header file
./interface/python/arm_vio.py	VIO Python interface script template
./interface/vio/vio_fvp.c	Implementation of CMSIS-Driver VIO for Arm FVPs

A read or write access to a VIO peripheral via its API triggers execution of a corresponding function in the Python script that implements the VIO Python interface instance. The concept is shown on the figure below.

Using VIO peripheral