Enumerate fails when interface has not endpoint about uhs30 HOT 12 CLOSED

I'll look into it later tonight. On Feb 27, 2017 7:51 AM, "Yuuichi Akagawa" <[email protected]> wrote: Hello, I implementing MIDI class. Some USB MIDI device have multiple interface. But the first interface may not have an endpoint. In this case, enumeration is fail. Configuration descriptor 0x0000 09 02 65 00 02 01 00 A0 32 09 04 00 00 00 01 01 0x0010 00 00 09 24 01 00 01 09 00 01 01 09 04 01 00 02 0x0020 01 03 00 00 07 24 01 00 01 41 00 06 24 02 01 01 0x0030 00 06 24 02 02 02 00 09 24 03 01 03 01 02 01 00 0x0040 09 24 03 02 04 01 01 01 00 09 05 01 02 40 00 00 0x0050 00 00 05 25 01 01 01 09 05 81 02 40 00 00 00 00 0x0060 05 25 01 01 03 Host initialized. configs: 1 CONFIGURATION: 0, bNumInterfaces 2, wTotalLength 101 bLength: 9 bDescriptorType: 02 bLength: 9 bDescriptorType: 04 INTERFACE DESCRIPTOR FOUND Getting 0 endpoints ENDPOINT DESCRIPTORS FILLED TestInterface VID:09e8 PID:007c Class:00 Subclass:00 Protocol 00 MIDI: checking vid 09e8, pid 007c, iface class 1, subclass 1 bLength: 36 bDescriptorType: 01 <- wrong bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 05 bLength: 5 bDescriptorType: 25 bLength: 9 bDescriptorType: 05 bLength: 5 bDescriptorType: 25 USB_INTERFACE END OF STREAM I tried commenting out the following line. https://github.com/felis/UHS30/blob/master/libraries/ UHS_host/UHS_host_INLINE.h#L764-L766 if(!ei->interface.numep) { // rcode = getone(pep, left, read, data, offset); // if(rcode) // return rcode; } It's work fine. Host initialized. configs: 1 CONFIGURATION: 0, bNumInterfaces 2, wTotalLength 101 bLength: 9 bDescriptorType: 02 bLength: 9 bDescriptorType: 04 INTERFACE DESCRIPTOR FOUND Getting 0 endpoints ENDPOINT DESCRIPTORS FILLED TestInterface VID:09e8 PID:007c Class:00 Subclass:00 Protocol 00 MIDI: checking vid 09e8, pid 007c, iface class 1, subclass 1 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 04 INTERFACE DESCRIPTOR FOUND Getting 2 endpoints bLength: 7 bDescriptorType: 24 bLength: 6 bDescriptorType: 24 bLength: 6 bDescriptorType: 24 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 05 bLength: 5 bDescriptorType: 25 bLength: 9 bDescriptorType: 05 ENDPOINT DESCRIPTORS FILLED TestInterface VID:09e8 PID:007c Class:00 Subclass:00 Protocol 00 MIDI: checking vid 09e8, pid 007c, iface class 1, subclass 3 bLength: 5 bDescriptorType: 25 USB_INTERFACE END OF STREAM bLength: 9 bDescriptorType: 02 bLength: 9 bDescriptorType: 04 INTERFACE DESCRIPTOR FOUND Getting 0 endpoints ENDPOINT DESCRIPTORS FILLED MIDI: checking vid 09e8, pid 007c, iface class 1, subclass 1 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 04 INTERFACE DESCRIPTOR FOUND Getting 2 endpoints bLength: 7 bDescriptorType: 24 bLength: 6 bDescriptorType: 24 bLength: 6 bDescriptorType: 24 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 24 bLength: 9 bDescriptorType: 05 bLength: 5 bDescriptorType: 25 bLength: 9 bDescriptorType: 05 ENDPOINT DESCRIPTORS FILLED MIDI: checking vid 09e8, pid 007c, iface class 1, subclass 3 MIDI: SetInterface bLength: 5 bDescriptorType: 25 MIDI: device detected Connected to MIDI Am I wrong? or correct? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#25>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADskzDoUnq_RBc8HSyk2a5YVWIbIo1SYks5rgsbLgaJpZM4MNESo> .

As far as another device to try, any USB mass storage device will do, for example, a thumb drive or an SDcard to USB reader. As for the code -- This block of code handles a device without any endpoints, and also serves as a simple feedback for cases where there is a bug in the code. The device you are testing managed to trigger it, so in this case it is a potential bug. I'm not aware of any actual devices that could trigger this, except perhaps for some battery chargers, which is possible to connect on boards other than the USB Host Shield.

Correct. UHS 3.0 is not device Centric instead it is interface Centric. This takes care of the classic problem of multiple interfaces on a single device.