Date: Tue, 14 Jan 2020 14:53:17 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Wojciech Puchar <wojtek@puchar.net> Cc: freebsd-hackers@freebsd.org Subject: Re: raspberry pi zero and SLOW USB HID Message-ID: <15d1ed37-a5d4-ed28-beeb-a4b248b5e802@selasky.org> In-Reply-To: <alpine.BSF.2.20.2001141431400.56040@puchar.net> References: <alpine.BSF.2.20.2001131439440.2189@puchar.net> <9f8ae63f-abe5-27d9-e6bf-3d0cc1d3d4f3@selasky.org> <alpine.BSF.2.20.2001131539550.36878@puchar.net> <9a1a3901-ce03-d445-dd9e-bbd775f5288a@selasky.org> <alpine.BSF.2.20.2001140810360.49599@puchar.net> <83126787-192b-5f1b-305c-f48818706b0c@selasky.org> <alpine.BSF.2.20.2001141431400.56040@puchar.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi, On 2020-01-14 14:32, Wojciech Puchar wrote: > Yes. > > Then i've tried linux (truly horrific experience) on raspberry pi. > Exactly the same delays on USB. It might be something in the DWC OTG chipset then :-( Let's put it like this. Be very happy that the DWC OTG works reliably AS-IS :-) I spent a lot of time hacking the driver to the state it is in today and reliability and device diversity has consequently been chosen over performance. If your device supports retrieving the data via a HID interface class control request, that might be faster! Else use a transfer of 64-bytes instead of 8-bytes. --HPS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?15d1ed37-a5d4-ed28-beeb-a4b248b5e802>