How can I read the button state of a joystick (ARD-358) using Arduino with Simulink?

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Alan Martínez
Alan Martínez 2019-10-10
回答： Arun Kumar 2019-10-15
I'm using Arduino MEGA 2560 with Simulink through the Simulink Support Package for Arduino Hardware and a joystick ARD-358
I have a problem when reading the state of the button of my joystick with the block Digital Input in Simulink. It does not read the digital signal, I always get the same value (0) wether I'm pressing the button or not.
This does not happen when using the following code in Arduino (the software).
int buttonPin = 53;
int buttonState = 0;
void setup() {
Serial.begin(9600);
pinMode(buttonPin, INPUT_PULLUP);
}
void loop() {
buttonState = digitalRead(buttonPin);
Serial.print(" | Button: ");
Serial.println(buttonState);
delay(100);
}
With this code I do get an accurate lecture, so we can rule out hardware damage.
The only difference I see between the Simulink diagram and the Arduino code is the section void setup, in which the pinMode is defined. In the Command Window in MATLAB I can use a similar command, configurePin, but I do not know how to use it in simulink.
I'd very much appreciate your help.

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回答（1 个）

Arun Kumar
Arun Kumar 2019-10-15
Hi,
The only difference between your arduino sketch and the generated code is the the pin configuration. With arduino sketch, the pin is configured as INPUT_PULLUP which will enable the internal pullup of this pin. But with Simulink, the default behaviour of input pin is floating. I am guessing this is the reason for the observed behaviour.
Workaround:
1. External pullup resistor: You can connect an external pullup resistor to the input pin. Refer this wiki page for more details https://en.wikipedia.org/wiki/Pull-up_resistor
2. Modify Source file: Alternatively you can modify the Simulink source file to enable input pullup by default. For that do the following:
  • In MATLAB command line type:
edit(fullfile(codertarget.arduinobase.internal.getSpPkgRootDir,'..','arduinobase','src','MW_arduino_digitalio.cpp'))
  • MW_arduino_digitalio file will open the the editor. In this file change the line pinMode(pin, INPUT) to pinMode(pin, INPUT_PULLUP) inside the function digitalIOSetup
Hope this helps.
Cheers!

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