MIDI Descriptor for USB communication

[RuudNL]

I have been experimenting with MIDI over USB for some time, without much success.
It seems there is more needed than only a HID descriptor, to have a PIC (18F4550) recognized as a 'MIDI Device'.
When I connect a commercial MIDI-to-USB interface, Windows 'sees' it as an 'Audio device'.
Does somebody know of a MIDI descriptor file (that can be used with PicBasic) that will show up the PIC as a MIDI interface?
In fact I only need PC to PIC communication, but two-way communication is of course also welcome!
Suggestions are highly appreciated!

[Ioannis]

Maybe this will help

http://www.picbasic.co.uk/forum/showthread.php?t=23638

https://sites.google.com/site/telepi...me/USB-to-MIDI

Ioannis

[RuudNL]

Thanks!

The first link is my previous question, that never received a usable answer. (Although some reactions had good intentions.)

The second link does not give any code, the code could be obtained upon request, but unfortunately I never received a reaction after mailing him...

[towlerg]

You apparently have or have access to a commercial MIDI-to-USB interface. Several USB monitor will generate a descriptor of a connected device (albeit not in exactly PBP format). I have several installed and if you're interested I will see if any for free/trial one will do that.

For example USB Device Tree generates this for a Pickit2

=========================== USB Port1 ===========================

Connection Status : 0x01 (Device is connected)
Port Chain : 3-1-2-1

======================== USB Device ========================

+++++++++++++++++ Device Information ++++++++++++++++++
Device Description : USB Input Device
Device Path : \\?\usb#vid_04d8&pid_0033#7&2f97cc0d&0&1#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Device ID : USB\VID_04D8&PID_0033\7&2F97CC0D&0&1
Hardware IDs : USB\VID_04D8&PID_0033&REV_0002 USB\VID_04D8&PID_0033
Driver KeyName : {745a17a0-74d3-11d0-b6fe-00a0c90f57da}\0051 (GUID_DEVCLASS_HIDCLASS)
Driver : system32\DRIVERS\hidusb.sys (Version: 6.1.7601.17514 Date: 2010-11-21)
Driver Inf : C:\Windows\inf\input.inf
Legacy BusType : PNPBus
Class : HIDClass
Class GUID : {745a17a0-74d3-11d0-b6fe-00a0c90f57da} (GUID_DEVCLASS_HIDCLASS)
Interface GUID : {a5dcbf10-6530-11d2-901f-00c04fb951ed} (GUID_DEVINTERFACE_USB_DEVICE)
Service : HidUsb
Enumerator : USB
Location Info : Port_#0001.Hub_#0006
Location IDs : PCIROOT(0)#PCI(1400)#USBROOT(0)#USB(1)#USB(2)#USB( 1)
Container ID : {6b462c36-dc86-11e9-b239-f4b7e2dd97cc}
Manufacturer Info : (Standard system devices)
Capabilities : 0x84 (Removable, SurpriseRemovalOK)
Status : 0x0180600A (DN_DRIVER_LOADED, DN_STARTED, DN_DISABLEABLE, DN_REMOVABLE, DN_NT_ENUMERATOR, DN_NT_DRIVER)
Problem Code : 0
Power State : D0 (supported: D0, D2, D3, wake from D0, wake from D2)
Child Device 1 : HID-compliant device
DevicePath : \\?\hid#vid_04d8&pid_0033#8&cbf5855&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
KernelName : \Device\00000112
Device ID : HID\VID_04D8&PID_0033\8&CBF5855&0&0000
Class : HIDClass

+++++++++++++++++ Registry USB Flags +++++++++++++++++
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\usbflags\04D800330002
osvc : REG_BINARY 00 00
SkipContainerIdQuery : REG_BINARY 00 00 00 00

---------------- Connection Information ---------------
Connection Index : 0x01 (1)
Connection Status : 0x01 (DeviceConnected)
Current Config Value : 0x01
Device Address : 0x1C (28)
Is Hub : 0x00 (no)
Device Bus Speed : 0x01 (Full-Speed)
Number Of Open Pipes : 0x02 (2 pipes to data endpoints)
Pipe[0] : EndpointID=1 Direction=IN ScheduleOffset=0 Type=Interrupt
Pipe[1] : EndpointID=1 Direction=OUT ScheduleOffset=0 Type=Interrupt

---------------------- Device Descriptor ----------------------
bLength : 0x12 (18 bytes)
bDescriptorType : 0x01 (Device Descriptor)
bcdUSB : 0x200 (USB Version 2.00)
bDeviceClass : 0x00 (defined by the interface descriptors)
bDeviceSubClass : 0x00
bDeviceProtocol : 0x00
bMaxPacketSize0 : 0x08 (8 bytes)
idVendor : 0x04D8 (Microchip Technology Inc.)
idProduct : 0x0033
bcdDevice : 0x0002
iManufacturer : 0x01 (String Descriptor 1)
Language 0x0409 : "Microchip Technology Inc."
iProduct : 0x02 (String Descriptor 2)
Language 0x0409 : "PICkit 2 Microcontroller Programmer"
iSerialNumber : 0x03 (String Descriptor 3)
Language 0x0409 : "Љ"
bNumConfigurations : 0x02 (2 Configurations)

------------------ Configuration Descriptor -------------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x02 (Configuration Descriptor)
wTotalLength : 0x0029 (41 bytes)
bNumInterfaces : 0x01 (1 Interface)
bConfigurationValue : 0x01 (Configuration 1)
iConfiguration : 0x02 (String Descriptor 2)
Language 0x0409 : "PICkit 2 Microcontroller Programmer"
bmAttributes : 0x80
D7: Reserved, set 1 : 0x01
D6: Self Powered : 0x00 (no)
D5: Remote Wakeup : 0x00 (no)
D4..0: Reserved, set 0 : 0x00
MaxPower : 0x32 (100 mA)

---------------- Interface Descriptor -----------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x00
bAlternateSetting : 0x00
bNumEndpoints : 0x02 (2 Endpoints)
bInterfaceClass : 0x03 (HID - Human Interface Device)
bInterfaceSubClass : 0x00 (None)
bInterfaceProtocol : 0x00 (None)
iInterface : 0x00 (No String Descriptor)

------------------- HID Descriptor --------------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x21 (HID Descriptor)
bcdHID : 0x0001 (HID Version 0.01)
bCountryCode : 0x00 (00 = not localized)
bNumDescriptors : 0x01
Descriptor 1:
bDescriptorType : 0x22 (Class=Report)
wDescriptorLength : 0x001D (29 bytes)
Error reading descriptor : ERROR_GEN_FAILURE

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x81 (Direction=IN EndpointID=1)
bmAttributes : 0x03 (TransferType=Interrupt)
wMaxPacketSize : 0x0040 (64 bytes)
bInterval : 0x01 (1 ms)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x01 (Direction=OUT EndpointID=1)
bmAttributes : 0x03 (TransferType=Interrupt)
wMaxPacketSize : 0x0040 (64 bytes)
bInterval : 0x01 (1 ms)

------------------ Configuration Descriptor -------------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x02 (Configuration Descriptor)
wTotalLength : 0x0029 (41 bytes)
bNumInterfaces : 0x01 (1 Interface)
bConfigurationValue : 0x01 (Configuration 1) *!*ERROR: Configuration 1 is defined more than once
iConfiguration : 0x02 (String Descriptor 2)
Language 0x0409 : "PICkit 2 Microcontroller Programmer"
bmAttributes : 0x80
D7: Reserved, set 1 : 0x01
D6: Self Powered : 0x00 (no)
D5: Remote Wakeup : 0x00 (no)
D4..0: Reserved, set 0 : 0x00
MaxPower : 0x32 (100 mA)

---------------- Interface Descriptor -----------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x00
bAlternateSetting : 0x00
bNumEndpoints : 0x02 (2 Endpoints)
bInterfaceClass : 0x03 (HID - Human Interface Device)
bInterfaceSubClass : 0x00 (None)
bInterfaceProtocol : 0x00 (None)
iInterface : 0x00 (No String Descriptor)

------------------- HID Descriptor --------------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x21 (HID Descriptor)
bcdHID : 0x0001 (HID Version 0.01)
bCountryCode : 0x00 (00 = not localized)
bNumDescriptors : 0x01
Descriptor 1:
bDescriptorType : 0x22 (Class=Report)
wDescriptorLength : 0x001D (29 bytes)
Error reading descriptor : ERROR_GEN_FAILURE

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x81 (Direction=IN EndpointID=1)
bmAttributes : 0x03 (TransferType=Interrupt)
wMaxPacketSize : 0x0040 (64 bytes)
bInterval : 0x01 (1 ms)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x01 (Direction=OUT EndpointID=1)
bmAttributes : 0x03 (TransferType=Interrupt)
wMaxPacketSize : 0x0040 (64 bytes)
bInterval : 0x01 (1 ms)

----------------- Device Qualifier Descriptor -----------------
Error : ERROR_GEN_FAILURE

-------------------- String Descriptors -------------------
------ String Descriptor 0 ------
bLength : 0x04 (4 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language ID[0] : 0x0409 (English - United States)
------ String Descriptor 1 ------
bLength : 0x34 (52 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "Microchip Technology Inc."
------ String Descriptor 2 ------
bLength : 0x48 (72 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "PICkit 2 Microcontroller Programmer"
------ String Descriptor 3 ------
bLength : 0x04 (4 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "Љ"

[RuudNL]

Wow, that is a lot of (probably) useful information!
The next question is: how to generate a descriptor file from this...
Thanks!

By the way: I saw HIDmaker Pro. That looks like an interesting (but expensive!) product for USB development.
A disadvantage is that there is not very much information about it, or even an evaluation version.

[tumbleweed]

By the way: I saw HIDmaker Pro

I'd be hard pressed to justify $400 for a tool that generates what you can basically get for free.
There are lots of examples out there (just not for PBP).

Besides, it's HID only. Wouldn't help much with what you're looking for.