Using VIO

Using Virtual I/O Interface (VIO)

Using Virtual I/O Interface (VIO)

VIO API provides a general purpose implementation for simple I/O peripherals. This chapter shows how VIO can be applied in a specific use case.

./interface/vio/vio_fvp.c: implements CMSIS-Driver VIO for Arm Virtual Hardware based on the ARM_VIO_Type structure and its mapping defined in arm_vio.h.

Setup

Instructions below cover specifically setup for using CMSIS-Driver VIO in a project on Arm Fixed Virtual Platfom (FVP) as a target.

• Install following software packs in your development environment, if not available yet:
  • ARM::CMSIS pack for access to CMSIS-Driver VIO API header (cmsis_vio.h)
  • Pack with target device support for access to VIO API (arm_vio.h)
  The packs can be found on CMSIS Packs page.
• Add to the project the CMSIS-Driver:VIO (API):Custom component that provides access to cmsis_vio.c file.
• Copy ./interface/vio/vio_fvp.c file to your local project folder and add it to the project.

Usage example

After VIO is setup in the project, the interface can be fully used as described in CMSIS-Driver VIO documentation.

For example to control virtual LEDs:

#include "cmsis_vio.h"                  // ::CMSIS Driver:VIO
 
int main (void) {
 
  vioInit();
  vioSetSignal(vioLED0, vioLEDon);
  // ...
  vioSetSignal(vioLED0, vioLEDoff);
}