AVH VIO Blinky example

The Blinky example is a simple demonstration of Python VIO module interaction with the application running on AVH model. Application VIO (LEDs, buttons) is therefore handled with Python script. Status of LEDs is printed to the terminal like LED: 00000000, where each digit represents one LED (e.g. LED: 00000001 means LED0 ON). The same applies to buttons, which will be presented as BTN: 00000000 in the terminal.

Numeric keys from 0 to 7 on PC keyboard are mapped to vioButton0 through vioButton7 respectively and can be used to interact with the application.

Note: Terminal printing LED status must have focus for key input to be registered.

Operation

• In the beginning vioLED0 blinks in 1 s interval. After 15 s the Python script will automatically press vioButton0.
• Blinking rate of vioLED0 changes and vioLED1 also starts blinking. Event on vioLED1 triggers an automatic event on vioButton0 which is delayed by 5 s.
• After 5s vioLED1 stops blinking and blinking rate of vioLED0 has returned to 1 s interval.
• After 25 s have passed, the Model will be automatically stopped by the Python script.

Prerequisites

• CMSIS-Toolbox 1.5.0 or later
• Arm Compiler 6.18 or later

Linux machines

Install Python getch package with:

pip3 install py-getch

Build

1. Use the csolution command to create .cprj project files.

   csolution convert -s Blinky.csolution.yml
   

2. Use the cbuild command to create executable files.

   cbuild Blinky.Debug+AVH.cprj
   cbuild Blinky.Release+AVH.cprj
   

Run

AVH Target

Execute the following steps:

• run the VHT model from the command line by executing:

  VHT_MPS3_Corstone_SSE-300 -f ./fvp_config.txt -V ./Python out/Blinky/AVH/Debug/Blinky.axf
  

• Press key 0 on PC keyboard to change LED blinking rate.