How to suppress error notification with "Joystick Input"-block if user doesnt have gamepad connected?

Hi,

I am useing the "Joystick Input"-block in my simulink model. But the model stops working without a gamepad connected. Error: "Error reported by S-function 'joyinput' in '...': Joystick not connected". This is very bad, because I want to accieve just an optional usage of the gamepad. Does anyone konw how to solve this problem?

Answer 1

[Jan Houska]

You can put the Joystick Input block into an Enabled Subsystem. Then, you can control the behavior using the Enable input. When the subsystem is not enabled (Enable input is 0), the block inside the subsystem does not execute and if the joystick device is not present, no error is reported. Then, after you connect the device, you can just enable the subsystem by changing the Enable input to 1.

[Walter Roberson]

Is there a way to query to see if the joystick is detected, with the result to be used as the Enable input?

[Jan Houska]

The following code should work:

joystickpresent = false;
try
 vrjoystick(1);
 joystickpresent = true;
catch ME
end

If joystick is not connected, ME.identifier is 'sl3d:vrjoystick:notconnected', so this should be probably checked to avoid confusion by other possible errors.