On Thu, Nov 26, 2020 at 3:44 PM Pavel Hofman <pavel.hofman@xxxxxxxxxxx> wrote: > > Dne 26. 11. 20 v 14:16 Jerome Brunet napsal(a): > > > >> Maximum data rates that I used were (AFAIR) 8 channel 192kHz/32bit, > >> but there is another issue with high data rate if someone uses so many > >> channels, very high sampling frequency or sample size that data can't > >> fit into allowed (by USB spec) max packet size of endpoint. In this case > >> need to decrease bInterval of endpoint. > > Should anyone test the patches with RPi4 dwc2 as the gadget, please note > the recently accepted patch > https://patchwork.kernel.org/project/linux-usb/patch/e9e7d070-593c-122f-3a5c-2435bb147ab2@xxxxxxxxxxx/ > which allows using full 1024 bytes maxpacketsize on EP OUT. It is not an > enumeration issue, but the old (= existing) RX FIFO size drops data with > packet sizes above 960 bytes. Thanks for bringing this to our attention. Does it affect RPi 3 as well? I'm going to test feedback feature on this board Regards, Ruslan
