hi i want write a gamepag HID descriptor i have some question about the function

[tdzuc]

hi i want write a gamepag HID descriptor i have some question about the function

[tdzuc]

Hi ,
below is my code for gamepad. the android received the data but it still seems not control the phone.
i push the joystick up, i think the selection of the item should be rotated up, but it seems not anything happen. i already add " bleHIDPeripheral.setReportIdOffset(1);"

my BLEGamepad.cpp

#include "BLEGamepad.h"

static const PROGMEM unsigned char descriptorValue[] = {
// From: https://github.com/adafruit/Adafruit-Trinket-USB/blob/master/TrinketHidCombo/TrinketHidComboC.c
// permission to use under MIT license by @ladyada (adafruit/Adafruit-Trinket-USB#10)

0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x05, // Usage (Game Pad)
0xA1, 0x01, // Collection (Application)
0x85, 0x07, // Report ID (7)
0x09, 0x01, // Usage (Pointer)
0xA1, 0x00, // Collection (Physical)
0x09, 0x30, // Usage (X)
0x09, 0x31, // Usage (Y)
0x09, 0x32, // Usage (Z)
0x09, 0x35, // Usage (Rz)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x75, 0x08, // Report Size (8)
0x95, 0x04, // Report Count (4)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0, // End Collection

0x09, 0x39, // Usage (Hat switch)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x07, // Logical Maximum (7)
0x35, 0x00, // Physical Minimum (0)
0x46, 0x3B, 0x01, // Physical Maximum (315)
0x65, 0x14, // Unit (System: English Rotation, Length: Centimeter)
0x75, 0x04, // Report Size (4)
0x95, 0x01, // Report Count (1)
0x81, 0x42, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,Null State)
0x75, 0x04, // Report Size (4)
0x95, 0x01, // Report Count (1)
0x81, 0x01, // Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x09, // Usage Page (Button)
0x19, 0x01, // Usage Minimum (0x01)
0x29, 0x0F, // Usage Maximum (0x0F)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x75, 0x01, // Report Size (1)
0x95, 0x10, // Report Count (16)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0 // End Collection

};

BLEGamepad::BLEGamepad() :
BLEHID(descriptorValue, sizeof(descriptorValue), 7),
_reportCharacteristic("2a4d", BLERead | BLENotify, 7),
_reportReferenceDescriptor(BLEHIDDescriptorTypeInput)
{
}
void BLEGamepad::move(signed char x, signed char y, signed char z, signed char Rz) {
unsigned char gamepadMove[7]= { 0x00, 0x00, 0x00, 0x00,0x00,0x00,0x00};

// send key code
gamepadMove[0] = x;
gamepadMove[1] = y;
gamepadMove[2] = z;
gamepadMove[3] = Rz;
this->sendData(this->_reportCharacteristic, gamepadMove, sizeof(gamepadMove));
}

void BLEGamepad::setReportId(unsigned char reportId) {
BLEHID::setReportId(reportId);

this->_reportReferenceDescriptor.setReportId(reportId);
}

unsigned char BLEGamepad::numAttributes() {
return 2;
}

BLELocalAttribute** BLEGamepad::attributes() {
static BLELocalAttribute* attributes[2];

attributes[0] = &this->_reportCharacteristic;
attributes[1] = &this->_reportReferenceDescriptor;

return attributes;
}

My BLEGamepad.h

#ifndef BLE_GAMEPAD_H
#define BLE_GAMEPAD_H

#include "Arduino.h"

#include "BLECharacteristic.h"
#include "BLEHIDReportReferenceDescriptor.h"
#include "BLEHID.h"

// From: https://github.com/adafruit/Adafruit-Trinket-USB/blob/master/TrinketHidCombo/TrinketHidCombo.h
// permission to use under MIT license by @ladyada (adafruit/Adafruit-Trinket-USB#10)

class BLEGamepad : public BLEHID
{
public:
BLEGamepad();

void move(signed char x, signed char y, signed char z, signed char Rz);

protected:
virtual void setReportId(unsigned char reportId);
virtual unsigned char numAttributes();
virtual BLELocalAttribute** attributes();

private:
BLECharacteristic _reportCharacteristic;
BLEHIDReportReferenceDescriptor _reportReferenceDescriptor;
};

#endif

My Arduino code

#include <SPI.h>
#include <BLEHIDPeripheral.h>
#include <BLEGamepad.h>

// define pins (varies per shield/board)
#define BLE_REQ -1
#define BLE_RDY -1
#define BLE_RST -1

// create peripheral instance, see pinouts above
BLEHIDPeripheral bleHIDPeripheral = BLEHIDPeripheral(BLE_REQ, BLE_RDY, BLE_RST);
BLEGamepad bleGamepad;

void setup() {
Serial.begin(9600);
#if defined (AVR_ATmega32U4)
while(!Serial);
#endif
bleHIDPeripheral.clearBondStoreData();
bleHIDPeripheral.setReportIdOffset(1);
bleHIDPeripheral.setLocalName("HID Gamepad");
bleHIDPeripheral.addHID(bleGamepad);

bleHIDPeripheral.begin();

Serial.println(F("BLE HID Gamepad"));
BLECentral central = bleHIDPeripheral.central();
}

void loop() {
BLECentral central = bleHIDPeripheral.central();

if (central) {
// central connected to peripheral
Serial.print(F("Connected to central: "));
Serial.println(central.address());

while (central.connected()) {

int x=0;
int y=14;
int z=0;
int Rz=0;
   bleGamepad.move(x, y, z, Rz);
}

// central disconnected
Serial.print(F("Disconnected from central: "));
Serial.println(central.address());

}
}

[sandeepmistry]

@tdzuc

1.how do you decide the number 11? it seems like reportIdOffset, but how do you decide to set 11?

This is the byte offset of the report offset in the descriptorValue.

See: https://github.com/sandeepmistry/arduino-BLEPeripheral/blob/master/BLEMouse.cpp#L12

2._reportCharacteristic("2a4d", BLERead | BLENotify, 4), the number represent the send value is 4 bytes but the MOUSE HID DESCRIPTOR only set 3 button 1bytes 1 X 1bytes 1Y 1bytes
the last byte is wheel but i didn't see it in mouse HID descriptor

Maybe wheel is not supported then?

3.i will use the descriptor like below to control the gamepad.

I think you need to use 7 for the report ID offset.

P.S.: please use markdown formatting in your comments, it makes things easier to read.

[sandeepmistry]

I think this has been answered, so closing for now.