Help with HID report descriptor

Projects Programming
1

Hello there chaps, I am making a HID dj controller with 128 single bit buttons and 48 analogue dials (pots) at 8 bit resolution.

I am very new to this type of prototyping but I'm learning as I go. Fortunately a lot of the coding for firmware creation has been done here UnoJoy

I am following the example there and expanding, so I edited
dataForController_t.h
UnoJoy.C
usb_gamepad.h
usb_gamepad.c

It is composing the HID report in usb_gamepad.c (is this the descriptor? I'm unsure) that I am having trouble with.

What HID usage type would be best for 128 buttons at 1 bit each and 48 dials (ADC) at 8 bit each?

Here is part of my code from usb_gamepad.c (which I know is wrong but I am stumped)

static const uint8_t PROGMEM device_descriptor[] = {
	18,					// bLength                    //I SHOULD CHANGE THIS TO 64?
	1,					// bDescriptorType
	0x10, 0x01,				// bcdUSB
	0,					// bDeviceClass
	0,					// bDeviceSubClass
	0,					// bDeviceProtocol
	ENDPOINT0_SIZE,				// bMaxPacketSize0
	LSB(VENDOR_ID), MSB(VENDOR_ID),		// idVendor
	LSB(PRODUCT_ID), MSB(PRODUCT_ID),	// idProduct
	0x00, 0x01,				// bcdDevice
	1,					// iManufacturer
	2,					// iProduct
	0,					// iSerialNumber
	1					// bNumConfigurations
};


static const uint8_t PROGMEM gamepad_hid_report_desc[] = {
	0x05, 0x01,        // USAGE_PAGE (Generic Desktop)
	0x09, 0x05,        // USAGE (Gamepad)
	0xa1, 0x01,        // COLLECTION (Application)
	0x15, 0x00,        //   LOGICAL_MINIMUM (0)
	0x25, 0x01,        //   LOGICAL_MAXIMUM (1)
	0x35, 0x00,        //   PHYSICAL_MINIMUM (0)
	0x45, 0x01,        //   PHYSICAL_MAXIMUM (1)
	0x75, 0x01,        //   REPORT_SIZE (1)
	0x95, 0x80,        //   REPORT_COUNT (128)
	0x05, 0x09,        //   USAGE_PAGE (Button)
	0x19, 0x01,        //   USAGE_MINIMUM (Button 1)
	0x29, 0x80,        //   USAGE_MAXIMUM (Button 128)
	0x81, 0x02,        //   INPUT (Data,Var,Abs)
	0x05, 0x01,        //   USAGE_PAGE (Generic Desktop)
	0x26, 0xff, 0x00,  //   LOGICAL_MAXIMUM (255)
	0x46, 0xff, 0x00,  //   PHYSICAL_MAXIMUM (255)
	0x09, 0x30,        //   USAGE (X)       //HERE IS WHERE I DERPED OUT, COULD I HAVE 48*X AXIS'?
	0x09, 0x31,        //   USAGE (Y)
	0x09, 0x32,        //   USAGE (Z)
	0x09, 0x35,        //   USAGE (Rz)
	0x75, 0x08,        //   REPORT_SIZE (8)
	0x95, 0x30,        //   REPORT_COUNT (48)
	0xc0               // END_COLLECTION
};

If required I can add my edited files or provide more information.

Thanks for reading and any guidance, locodog