Which **tud_descriptor_** callbacks to implement?

[bkaz4283]

Hello,

I am trying to implement MIDI over USB in my product using TinyUSB. The "Getting Started" instructions say to "implement all tud_descriptor_ callbacks..." But how do I know which callbacks to implement exactly?

usbd.c contains the "process_get_descriptor()" function which anticipates six possibilities:
TUSB_DESC_DEVICE
TUSB_DESC_BOS
TUSB_DESC_CONFIGURATION
TUSB_DESC_STRING
TUSB_DESC_DEVICE_QUALIFIER
TUSB_DESC_OTHER_SPEED_CONFIG

However, in tusb_types.h I find the following additional descriptor types:
TUSB_DESC_INTERFACE = 0x04,
TUSB_DESC_ENDPOINT = 0x05,
TUSB_DESC_INTERFACE_POWER = 0x08,
TUSB_DESC_OTG = 0x09,
TUSB_DESC_DEBUG = 0x0A,
TUSB_DESC_INTERFACE_ASSOCIATION = 0x0B,
TUSB_DESC_DEVICE_CAPABILITY = 0x10,
TUSB_DESC_FUNCTIONAL = 0x21,
TUSB_DESC_CS_DEVICE = 0x21,
TUSB_DESC_CS_CONFIGURATION = 0x22,
TUSB_DESC_CS_STRING = 0x23,
TUSB_DESC_CS_INTERFACE = 0x24,
TUSB_DESC_CS_ENDPOINT = 0x25,
TUSB_DESC_SUPERSPEED_ENDPOINT_COMPANION = 0x30,
TUSB_DESC_SUPERSPEED_ISO_ENDPOINT_COMPANION = 0x31

A few questions:

1. How do I know which of these descriptors I need to support? My device is only USB 1.1 compliant.
2. Do I need to add cases to the process_get_descriptor() function for the additional descriptors I need to support, basically copying the code for the other descriptors and modifying it as needed?
3. Is this what is meant by "implement all tud_descriptor_ callbacks..."??

Please excuse my ignorance, I am really new to programming the USB stack and it all feels a bit overwhelming for now...

Thanks for any help you can offer!
-Brian

[hathach]

have you tried to run any of the stock examples, if not start & get familiar from there https://github.com/hathach/tinyusb/tree/master/examples/device