Trying to understand how a USB joystick passes (parses?) button values

Other Hardware Robotics
1

I have successfully tested the Logitech 3d Pro joystick with the USB host shield, everything works as it should, I just don't understand how?
I
I want to modify the code so that the 'Button' event to allow for multiple buttons to be used simultaneously.

In the current format there is a single variable with a value of 0-12 (0= no button pressed).
I would like each button (there are 12 in total) on the joystick to return a boolean value with each cycle (loop or update).

I attempted to identify where and how the current code does this but became very quickly confused and I realise that I am totally out of my depth.

Also: what the the "correct" way to provide example code in the forum (instead of simply attaching)?

My Goal is to understand how this works, currently so that I can modify the various components myself and understand how the code structure works (best to know how to fix something BEFORE you break it).

When I started trying to understand the USBHID and USBHOST libraries I quickly learned that it is time to seek help from the community.

Logitech3DPro.ino (2.08 KB)

2

what the the "correct" way to provide example code in the forum

Like this

/*
 *  Simplified Logitech Extreme 3D Pro Joystick Report Parser, ready to go.
*/

#include <usbhid.h>
#include <hiduniversal.h>
#include <usbhub.h>
#include "le3dp_rptparser2.0.h"
#include <SPI.h>
#include <Servo.h>

USB                                             Usb;
USBHub                                          Hub(&Usb);
HIDUniversal                                    Hid(&Usb);
JoystickEvents                                  JoyEvents;
JoystickReportParser                            Joy(&JoyEvents);
Servo myservo;  // create servo object to control a servo

//int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

void setup()
{
  Serial.begin( 115200 );
#if !defined(__MIPSEL__)
  while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
  Serial.println("Start");
  if (Usb.Init() == -1)
    Serial.println("OSC did not start.");
  delay( 200 );
  if (!Hid.SetReportParser(0, &Joy))
    ErrorMessage<uint8_t>(PSTR("SetReportParser"), 1  );
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop()
{
  //
  int Xval;   // 0 - 1023
  int Yval;   // 0 - 1023
  int Hat;    // 0 - 15;
  int Twist;  // 0 - 255
  int Slider; // 0 - 255
  int Button; // 0 - 12 (0 = No button)
  Usb.Task();                                                    //Use to read joystick input to controller
  JoyEvents.PrintValues();                                       //Returns joystick values to user
  JoyEvents.GetValues(Xval, Yval, Hat, Twist, Slider, Button);   //Copies joystick values to user
  //val = Twist;            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(Xval, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);                  // sets the servo position according to the scaled value
  delay(15);                           // waits for the servo to get there
}

Select the code in the IDE, right click, select Copy for Forum and post it here

3

Thank you @UKHeliBob, as you seem to have done this for me I will not go back and correct the original post to 'insert' the code.
Perhaps some other newbie will read this and take some learning(s) from-

A: my lack of knowledge, and
B: your clarification

4

I assume that you did not read Read this before posting a programming question before posting your question