Simplify usb_desc.h configuration - do not require computing descriptor sizes/offsets

teensy3/usb_desc.c

 #endif
 
 
+// **************************************************************
+//   USB Descriptor Sizes
+// **************************************************************
+
+// pre-compute the size and position of everything in the config descriptor
+//
+#define CONFIG_HEADER_DESCRIPTOR_SIZE	9
+
+#define CDC_IAD_DESCRIPTOR_POS		CONFIG_HEADER_DESCRIPTOR_SIZE
+#ifdef  CDC_IAD_DESCRIPTOR
+#define CDC_IAD_DESCRIPTOR_SIZE		8
+#else
+#define CDC_IAD_DESCRIPTOR_SIZE		0
+#endif
+
+#define CDC_DATA_INTERFACE_DESC_POS	CDC_IAD_DESCRIPTOR_POS+CDC_IAD_DESCRIPTOR_SIZE
+#ifdef  CDC_DATA_INTERFACE
+#define CDC_DATA_INTERFACE_DESC_SIZE	9+5+5+4+5+7+9+7+7
+#else
+#define CDC_DATA_INTERFACE_DESC_SIZE	0
+#endif
+
+#define MIDI_INTERFACE_DESC_POS		CDC_DATA_INTERFACE_DESC_POS+CDC_DATA_INTERFACE_DESC_SIZE
+#ifdef  MIDI_INTERFACE
+#define MIDI_INTERFACE_DESC_SIZE	9+7+6+6+9+9+9+5+9+5
+#else
+#define MIDI_INTERFACE_DESC_SIZE	0
+#endif
+
+#define KEYBOARD_INTERFACE_DESC_POS	MIDI_INTERFACE_DESC_POS+MIDI_INTERFACE_DESC_SIZE
+#ifdef  KEYBOARD_INTERFACE
+#define KEYBOARD_INTERFACE_DESC_SIZE	9+9+7
+#define KEYBOARD_HID_DESC_OFFSET	KEYBOARD_INTERFACE_DESC_POS+9
+#else
+#define KEYBOARD_INTERFACE_DESC_SIZE	0
+#endif
+
+#define MOUSE_INTERFACE_DESC_POS	KEYBOARD_INTERFACE_DESC_POS+KEYBOARD_INTERFACE_DESC_SIZE
+#ifdef  MOUSE_INTERFACE
+#define MOUSE_INTERFACE_DESC_SIZE	9+9+7
+#define MOUSE_HID_DESC_OFFSET		MOUSE_INTERFACE_DESC_POS+9
+#else
+#define MOUSE_INTERFACE_DESC_SIZE	0
+#endif
+
+#define RAWHID_INTERFACE_DESC_POS	MOUSE_INTERFACE_DESC_POS+MOUSE_INTERFACE_DESC_SIZE
+#ifdef  RAWHID_INTERFACE
+#define RAWHID_INTERFACE_DESC_SIZE	9+9+7+7
+#define RAWHID_HID_DESC_OFFSET		RAWHID_INTERFACE_DESC_POS+9
+#else
+#define RAWHID_INTERFACE_DESC_SIZE	0
+#endif
+
+#define FLIGHTSIM_INTERFACE_DESC_POS	RAWHID_INTERFACE_DESC_POS+RAWHID_INTERFACE_DESC_SIZE
+#ifdef  FLIGHTSIM_INTERFACE
+#define FLIGHTSIM_INTERFACE_DESC_SIZE	9+9+7+7
+#define FLIGHTSIM_HID_DESC_OFFSET	FLIGHTSIM_INTERFACE_DESC_POS+9
+#else
+#define FLIGHTSIM_INTERFACE_DESC_SIZE	0
+#endif
+
+#define SEREMU_INTERFACE_DESC_POS	FLIGHTSIM_INTERFACE_DESC_POS+FLIGHTSIM_INTERFACE_DESC_SIZE
+#ifdef  SEREMU_INTERFACE
+#define SEREMU_INTERFACE_DESC_SIZE	9+9+7+7
+#define SEREMU_HID_DESC_OFFSET		SEREMU_INTERFACE_DESC_POS+9
+#else
+#define SEREMU_INTERFACE_DESC_SIZE	0
+#endif
+
+#define JOYSTICK_INTERFACE_DESC_POS	SEREMU_INTERFACE_DESC_POS+SEREMU_INTERFACE_DESC_SIZE
+#ifdef  JOYSTICK_INTERFACE
+#define JOYSTICK_INTERFACE_DESC_SIZE	9+9+7
+#define JOYSTICK_HID_DESC_OFFSET	JOYSTICK_INTERFACE_DESC_POS+9
+#else
+#define JOYSTICK_INTERFACE_DESC_SIZE	0
+#endif
+
+#define CONFIG_DESC_SIZE		JOYSTICK_INTERFACE_DESC_POS+JOYSTICK_INTERFACE_DESC_SIZE
+
+
 
 // **************************************************************
 //   USB Configuration
 	{0x0200, 0x0000, config_descriptor, sizeof(config_descriptor)},
 #ifdef SEREMU_INTERFACE
 	{0x2200, SEREMU_INTERFACE, seremu_report_desc, sizeof(seremu_report_desc)},
-	{0x2100, SEREMU_INTERFACE, config_descriptor+SEREMU_DESC_OFFSET, 9},
+	{0x2100, SEREMU_INTERFACE, config_descriptor+SEREMU_HID_DESC_OFFSET, 9},
 #endif
 #ifdef KEYBOARD_INTERFACE
         {0x2200, KEYBOARD_INTERFACE, keyboard_report_desc, sizeof(keyboard_report_desc)},
-        {0x2100, KEYBOARD_INTERFACE, config_descriptor+KEYBOARD_DESC_OFFSET, 9},
+        {0x2100, KEYBOARD_INTERFACE, config_descriptor+KEYBOARD_HID_DESC_OFFSET, 9},
 #endif
 #ifdef MOUSE_INTERFACE
         {0x2200, MOUSE_INTERFACE, mouse_report_desc, sizeof(mouse_report_desc)},
-        {0x2100, MOUSE_INTERFACE, config_descriptor+MOUSE_DESC_OFFSET, 9},
+        {0x2100, MOUSE_INTERFACE, config_descriptor+MOUSE_HID_DESC_OFFSET, 9},
 #endif
 #ifdef JOYSTICK_INTERFACE
         {0x2200, JOYSTICK_INTERFACE, joystick_report_desc, sizeof(joystick_report_desc)},
-        {0x2100, JOYSTICK_INTERFACE, config_descriptor+JOYSTICK_DESC_OFFSET, 9},
+        {0x2100, JOYSTICK_INTERFACE, config_descriptor+JOYSTICK_HID_DESC_OFFSET, 9},
 #endif
 #ifdef RAWHID_INTERFACE
 	{0x2200, RAWHID_INTERFACE, rawhid_report_desc, sizeof(rawhid_report_desc)},
-	{0x2100, RAWHID_INTERFACE, config_descriptor+RAWHID_DESC_OFFSET, 9},
+	{0x2100, RAWHID_INTERFACE, config_descriptor+RAWHID_HID_DESC_OFFSET, 9},
 #endif
 #ifdef FLIGHTSIM_INTERFACE
 	{0x2200, FLIGHTSIM_INTERFACE, flightsim_report_desc, sizeof(flightsim_report_desc)},
-	{0x2100, FLIGHTSIM_INTERFACE, config_descriptor+FLIGHTSIM_DESC_OFFSET, 9},
+	{0x2100, FLIGHTSIM_INTERFACE, config_descriptor+FLIGHTSIM_HID_DESC_OFFSET, 9},
 #endif
         {0x0300, 0x0000, (const uint8_t *)&string0, 0},
         {0x0301, 0x0409, (const uint8_t *)&usb_string_manufacturer_name, 0},
         {0x0302, 0x0409, (const uint8_t *)&usb_string_product_name, 0},
         {0x0303, 0x0409, (const uint8_t *)&usb_string_serial_number, 0},
-        //{0x0301, 0x0409, (const uint8_t *)&string1, 0},
-        //{0x0302, 0x0409, (const uint8_t *)&string2, 0},
-        //{0x0303, 0x0409, (const uint8_t *)&string3, 0},
 	{0, 0, NULL, 0}
 };
 

teensy3/usb_desc.h

 #define ENDPOINT_TRANSMIT_AND_RECEIVE	0x1D
 
 /*
-To modify a USB Type to have different interfaces, start in this
-file.  Delete the XYZ_INTERFACE lines for any interfaces you
-wish to remove, and copy them from another USB Type for any you
-want to add.
+Each group of #define lines below corresponds to one of the
+settings in the Tools > USB Type menu.  This file defines what
+type of USB device is actually created for each of those menu
+options.
+
+Each "interface" is a set of functionality your PC or Mac will
+use and treat as if it is a unique device.  Within each interface,
+the "endpoints" are the actual communication channels.  Most
+interfaces use 1, 2 or 3 endpoints.  By editing only this file,
+you can customize the USB Types to be any collection of interfaces.
+
+To modify a USB Type, delete the XYZ_INTERFACE lines for any
+interfaces you wish to remove, and copy them from another USB Type
+for any you want to add.
 
 Give each interface a unique number, and edit NUM_INTERFACE to
-reflect the number of interfaces.
+reflect the total number of interfaces.
+
+Next, assign unique endpoint numbers to all the endpoints across
+all the interfaces your device has.  You can reuse an endpoint
+number for transmit and receive, but the same endpoint number must
+not be used twice to transmit, or twice to receive.
+
+Most endpoints also require their maximum size, and some also
+need an interval specification (the number of milliseconds the
+PC will check for data from that endpoint).  For existing
+interfaces, usually these other settings should not be changed.
 
-Within each interface, make sure it uses a unique set of endpoints.
 Edit NUM_ENDPOINTS to be at least the largest endpoint number used.
-Then edit the ENDPOINT*_CONFIG lines so each endpoint is configured
+
+Edit NUM_USB_BUFFERS to control how much memory the USB stack will
+allocate.  At least 2 should be used for each endpoint.  More
+memory will allow higher throughput for user programs that have
+high latency (eg, spending time doing things other than interacting
+with the USB).
+
+Edit the ENDPOINT*_CONFIG lines so each endpoint is configured
 the proper way (transmit, receive, or both).
 
-The CONFIG_DESC_SIZE and any XYZ_DESC_OFFSET numbers must be
-edited to the correct sizes.  See usb_desc.c for the giant array
-of bytes.  Someday these may be done automatically..... (but how?)
+If you are using existing interfaces (making your own device with
+a different set of interfaces) the code in all other files should
+automatically adapt to the new endpoints you specify here.
 
-If you are using existing interfaces, the code in each file should
-automatically adapt to the changes you specify.  If you need to
-create a new type of interface, you'll need to write the code which
-sends and receives packets, and presents an API to the user.
+However, the .h files for each interface, which define the API
+visible to user programs, may need to be edited.  At the top of
+each .h file is #if defined(USB_XYZ).  These may need to be edited
+to make the interface API appear to your program.
 
-Finally, edit usb_inst.cpp, which creats instances of the C++
-objects for each combination.
+If you need to create a new type of interface, you'll need to write
+the code which sends and receives packets, and presents an API to
+the user.  Usually, a pair of files are added for the actual code,
+and code is also added in usb_dev.c for any control transfers,
+interrupt-level code, or other very low-level stuff not possible
+from the packet send/receive functons.  Code also is added in
+usb_inst.c to create an instance of your C++ object.
+
+You may edit the Vendor and Product ID numbers, and strings.  If
+the numbers are changed, Teensyduino may not be able to automatically
+find and reboot your board when you click the Upload button in
+the Arduino IDE.  You will need to press the Program button on
+Teensy to initiate programming.
 
 Some operating systems, especially Windows, may cache USB device
 info.  Changes to the device name may not update on the same
 */
 
 
-
 #if defined(USB_SERIAL)
   #define VENDOR_ID		0x16C0
   #define PRODUCT_ID		0x0483
   #define CDC_ACM_SIZE          16
   #define CDC_RX_SIZE           64
   #define CDC_TX_SIZE           64
-  #define CONFIG_DESC_SIZE	(9+9+5+5+4+5+7+9+7+7)
   #define ENDPOINT2_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT3_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define ENDPOINT4_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define JOYSTICK_ENDPOINT     4
   #define JOYSTICK_SIZE         16
   #define JOYSTICK_INTERVAL     2
-  #define KEYBOARD_DESC_OFFSET	(9 + 9)
-  #define MOUSE_DESC_OFFSET	(9 + 9+9+7 + 9)
-  #define SEREMU_DESC_OFFSET	(9 + 9+9+7 + 9+9+7 + 9)
-  #define JOYSTICK_DESC_OFFSET	(9 + 9+9+7 + 9+9+7 + 9+9+7+7 + 9)
-  #define CONFIG_DESC_SIZE	(9 + 9+9+7 + 9+9+7 + 9+9+7+7 + 9+9+7)
   #define ENDPOINT1_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT2_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define ENDPOINT3_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define JOYSTICK_ENDPOINT     6
   #define JOYSTICK_SIZE         16
   #define JOYSTICK_INTERVAL     1
-  #define KEYBOARD_DESC_OFFSET	(9+8 + 9+5+5+4+5+7+9+7+7 + 9)
-  #define MOUSE_DESC_OFFSET	(9+8 + 9+5+5+4+5+7+9+7+7 + 9+9+7 + 9)
-  #define JOYSTICK_DESC_OFFSET	(9+8 + 9+5+5+4+5+7+9+7+7 + 9+9+7 + 9+9+7 + 9)
-  #define CONFIG_DESC_SIZE	(9+8 + 9+5+5+4+5+7+9+7+7 + 9+9+7 + 9+9+7 + 9+9+7)
   #define ENDPOINT1_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT2_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT3_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define MIDI_TX_SIZE          64
   #define MIDI_RX_ENDPOINT      4
   #define MIDI_RX_SIZE          64
-  #define SEREMU_DESC_OFFSET	(9 + 9+7+6+6+9+9+9+5+9+5 + 9)
-  #define CONFIG_DESC_SIZE	(9 + 9+7+6+6+9+9+9+5+9+5 + 9+9+7+7)
   #define ENDPOINT1_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT2_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define ENDPOINT3_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define SEREMU_RX_ENDPOINT    2
   #define SEREMU_RX_SIZE        32
   #define SEREMU_RX_INTERVAL    2
-  #define RAWHID_DESC_OFFSET	(9 + 9)
-  #define SEREMU_DESC_OFFSET	(9 + 9+9+7+7 + 9)
-  #define CONFIG_DESC_SIZE	(9 + 9+9+7+7 + 9+9+7+7)
   #define ENDPOINT1_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT2_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define ENDPOINT3_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define SEREMU_RX_ENDPOINT    2
   #define SEREMU_RX_SIZE        32
   #define SEREMU_RX_INTERVAL    2
-  #define FLIGHTSIM_DESC_OFFSET	(9 + 9)
-  #define SEREMU_DESC_OFFSET	(9 + 9+9+7+7 + 9)
-  #define CONFIG_DESC_SIZE	(9 + 9+9+7+7 + 9+9+7+7)
   #define ENDPOINT1_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT2_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define ENDPOINT3_CONFIG	ENDPOINT_TRANSIMIT_ONLY

teensy3/usb_inst.cpp

  */
 
 #include "WProgram.h"
+#include "usb_desc.h"
 
 #if F_CPU >= 20000000
 
-#ifdef USB_SERIAL
+#ifdef CDC_DATA_INTERFACE
 usb_serial_class Serial;
 #endif
 
-#ifdef USB_HID
-usb_keyboard_class Keyboard;
-usb_mouse_class Mouse;
-usb_joystick_class Joystick;
-uint8_t usb_joystick_class::manual_mode = 0;
-usb_seremu_class Serial;
+#ifdef MIDI_INTERFACE
+usb_midi_class usbMIDI;
 #endif
 
-#ifdef USB_SERIAL_HID
-usb_serial_class Serial;
+#ifdef KEYBOARD_INTERFACE
 usb_keyboard_class Keyboard;
-usb_mouse_class Mouse;
-usb_joystick_class Joystick;
-uint8_t usb_joystick_class::manual_mode = 0;
 #endif
 
-#ifdef USB_MIDI
-usb_midi_class usbMIDI;
-usb_seremu_class Serial;
+#ifdef MOUSE_INTERFACE
+usb_mouse_class Mouse;
 #endif
 
-#ifdef USB_RAWHID
+#ifdef RAWHID_INTERFACE
 usb_rawhid_class RawHID;
-usb_seremu_class Serial;
 #endif
 
-#ifdef USB_FLIGHTSIM
+#ifdef FLIGHTSIM_INTERFACE
 FlightSimClass FlightSim;
+#endif
+
+#ifdef SEREMU_INTERFACE
 usb_seremu_class Serial;
 #endif
 
+#ifdef JOYSTICK_INTERFACE
+usb_joystick_class Joystick;
+uint8_t usb_joystick_class::manual_mode = 0;
+#endif
+
 
 #else // F_CPU < 20 MHz