gnupic: Re: [gnupic] Problems with USB PIC 18f2455
Subject:
Re: [gnupic] Problems with USB PIC 18f2455
From:
Wojciech Zabołotny ####@####.####
Date:
8 Mar 2006 00:19:31 +0000
Message-Id: <440E2228.8070904@elektron.elka.pw.edu.pl>
Nicholas Robinson napisał(a):
>Using dmesg I get:
>
>usb 2-2: new low speed USB device using uhci_hcd and address 3
>usb 2-2: device descriptor read/64, error -71
>usb 2-2: device descriptor read/64, error -71
>usb 2-2: new low speed USB device using uhci_hcd and address 4
>usb 2-2: new low speed USB device using uhci_hcd and address 5
>usb 2-2: device descriptor read/64, error -71
>usb 2-2: device descriptor read/64, error -71
>usb 2-2: new low speed USB device using uhci_hcd and address 6
>usb 2-2: device descriptor read/64, error -71
>usb 2-2: device descriptor read/64, error -71
>usb 2-2: new low speed USB device using uhci_hcd and address 7
>usb 2-2: device not accepting address 7, error -71
>usb 2-2: new low speed USB device using uhci_hcd and address 8
>usb 2-2: device not accepting address 8, error -71
>
>
>
I had similar problem today, when I've forgotten to connect the 220nF
capacitor between VUSB and GND in my 18F4550 board.
Incorrect USB base clock frequency may also cause similar problems.
Also make sure that you don't set the FSEN bit in the UCFG register (as
your device works in low speed mode).
--
HTH,
Wojtek Zabolotny
