Hi everyone!
I'm just starting to make my own USB devices with the Microchip PIC16c745
microcontroller.
For those who don't already know, the 16c745 is a low-speed only device,
and hence limited to control and interrupt endpoints.
I'll be making various kinds of IO devices and for ease of use I'd like to
stick to making HID devices mostly because of good HID driver availability.
I'd like to use libusb for accessing my device at least in *ix systems,
whether I'll use libusb-win32 in Windows or not will be determined later,
I've seen some remarks that the libusb design doesn't fit very well within
the Windows driver model (gee, surprise) so at first I'll stick to HID.
I want to be able to use both reports and interrupt transfers to communicate
with the device, probably not in the same project though. Am I correct in
understanding that the libusb usb_bulk_read/write() functions will use
interrupt transfers for interrupt endpoints in spite of their names?
Anyway, I've started mocking with the descriptors, and with a few lines of
libusb code (usb-oops.c, attached) I can make my kernel oops (usb-oops.txt)
reliably. What gives? (Should I run ksymoops even though function names are
in the oops? No, right?)
The system (Thinkpad T20) is powered up with the device detached. I plug the
device in, and it shows up fine. (As a mouse though, guess that's because of
the report descriptor that I haven't yet changed from the Microchip mouse
example.) I run lsusb twice, causing the usbfs: warnings, and then I run
usb-oops.
I also wonder why lsusb (lsusb.txt) is unable to read the mfr and product
strings, while the kernel reads them just fine, as seen in the dmesg output.
I hope the attachments are ok.
Thanks in advance for any suggestions that you may have and want to tell me
about, although a few of my current question marks probably are off-topic
for this list. Sorry about that.
//Peter
#include <stdio.h>
#include <stdlib.h>
#include <usb.h>
int main(int argc,char **argv) {
int i,ep;
struct usb_bus *busses,*bus;
struct usb_device *dev;
usb_dev_handle *dev_handle;
usb_init();
usb_find_busses();
usb_find_devices();
busses=usb_get_busses();
for(bus=busses;bus;bus=bus->next)
for(dev=bus->devices;dev;dev=dev->next)
if(dev->descriptor.idVendor==0x04d8&&dev->descriptor.idProduct==0x0001)
goto found;
return 0;
found:
dev_handle=usb_open(dev);
i=usb_set_configuration(dev_handle,0);
printf("usb_set_configuration=%d\n",i);
if(i<0)
return 1;
i=usb_claim_interface(dev_handle,0);
printf("usb_claim_interface=%d\n",i);
if(i<0)
return 1;
ep=dev->config->interface->altsetting->endpoint->bEndpointAddress;
printf("using ep 0x%x\n",ep);
i=usb_resetep(dev_handle,ep);
printf("usb_resetep=%d\n",i);
if(i<0)
return 1;
usb_release_interface(dev_handle,0);
usb_close(dev_handle);
return 0;
}
Linux version 2.6.0-test11 ([EMAIL PROTECTED]) (gcc version 3.2.2 20030322 (Gentoo
Linux 1.4 3.2.2-r2)) #4 Tue Dec 16 09:06:15 CET 2003
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000017ff0000 (usable)
BIOS-e820: 0000000017ff0000 - 0000000017ffec00 (ACPI data)
BIOS-e820: 0000000017ffec00 - 0000000018000000 (ACPI NVS)
BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
383MB LOWMEM available.
On node 0 totalpages: 98288
DMA zone: 4096 pages, LIFO batch:1
Normal zone: 94192 pages, LIFO batch:16
HighMem zone: 0 pages, LIFO batch:1
DMI 2.3 present.
ACPI disabled because your bios is from 1999 and too old
You can enable it with acpi=force
IBM machine detected. Enabling interrupts during APM calls.
IBM machine detected. Disabling SMBus accesses.
ACPI: RSDP (v000 PTLTD ) @ 0x000f7170
ACPI: RSDT (v001 PTLTD RSDT 0x06041210 LTP 0x00000000) @ 0x17ff4e36
ACPI: FADT (v001 IBM TP-T20 0x06041210 0x00000000) @ 0x17ffeb65
ACPI: BOOT (v001 PTLTD $SBFTBL$ 0x06041210 LTP 0x00000001) @ 0x17ffebd9
ACPI: DSDT (v001 IBM TP-T20 0x06041210 MSFT 0x0100000c) @ 0x00000000
Building zonelist for node : 0
Kernel command line: auto BOOT_IMAGE=lix260t11 ro root=303
snd-cs46xx:thinkpad=1,mmap_valid=1
Initializing CPU#0
PID hash table entries: 2048 (order 11: 16384 bytes)
Detected 647.320 MHz processor.
Console: colour VGA+ 80x25
Memory: 382656k/393152k available (4090k kernel code, 9740k reserved, 1213k data, 160k
init, 0k highmem)
Calibrating delay loop... 1277.95 BogoMIPS
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: After generic identify, caps: 0383f9ff 00000000 00000000 00000000
CPU: After vendor identify, caps: 0383f9ff 00000000 00000000 00000000
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 256K
CPU: After all inits, caps: 0383f9ff 00000000 00000000 00000040
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU: Intel Pentium III (Coppermine) stepping 03
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xfd94f, last bus=7
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
ACPI: Subsystem revision 20031002
ACPI: Interpreter disabled.
Linux Kernel Card Services
options: [pci] [cardbus] [pm]
drivers/usb/core/usb.c: registered new driver usbfs
drivers/usb/core/usb.c: registered new driver hub
ACPI: ACPI tables contain no PCI IRQ routing entries
PCI: Invalid ACPI-PCI IRQ routing table
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
PCI: Discovered primary peer bus 08 [IRQ]
PCI: Using IRQ router PIIX/ICH [8086/7110] at 0000:00:07.0
NET: Registered protocol family 23
Bluetooth: Core ver 2.3
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
SBF: ACPI BOOT descriptor is wrong length (39)
SBF: Simple Boot Flag extension found and enabled.
SBF: Setting boot flags 0x1
Machine check exception polling timer started.
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac)
ikconfig 0.7 with /proc/config*
devfs: v1.22 (20021013) Richard Gooch ([EMAIL PROTECTED])
devfs: boot_options: 0x1
Installing knfsd (copyright (C) 1996 [EMAIL PROTECTED]).
NTFS driver 2.1.5 [Flags: R/O].
udf: registering filesystem
SGI XFS for Linux with no debug enabled
SGI XFS Quota Management subsystem
Limiting direct PCI/PCI transfers.
pty: 256 Unix98 ptys configured
lp: driver loaded but no devices found
Real Time Clock Driver v1.12
Linux agpgart interface v0.100 (c) Dave Jones
agpgart: Detected an Intel 440BX Chipset.
agpgart: Maximum main memory to use for agp memory: 321M
agpgart: AGP aperture is 64M @ 0xf8000000
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS1 at I/O 0x2f8 (irq = 3) is a NS16550A
parport0: PC-style at 0x378 [PCSPP]
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
lp0: using parport0 (polling).
Using anticipatory io scheduler
Floppy drive(s): fd0 is 1.44M
FDC 0 is a National Semiconductor PC87306
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
nbd: registered device at major 43
PCI: Found IRQ 9 for device 0000:00:03.0
PCI: Sharing IRQ 9 with 0000:00:03.1
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
0000:00:03.0: 3Com PCI 3c556B Laptop Hurricane at 0x1800. Vers LK1.1.19
PPP generic driver version 2.4.2
PPP Deflate Compression module registered
PPP BSD Compression module registered
Universal TUN/TAP device driver 1.5 (C)1999-2002 Maxim Krasnyansky
orinoco.c 0.13e (David Gibson <[EMAIL PROTECTED]> and others)
orinoco_cs.c 0.13e (David Gibson <[EMAIL PROTECTED]> and others)
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX4: IDE controller at PCI slot 0000:00:07.1
PIIX4: chipset revision 1
PIIX4: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x1c00-0x1c07, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0x1c08-0x1c0f, BIOS settings: hdc:DMA, hdd:pio
hda: HITACHI_DK23AA-12B, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hdc: CRN-8241U, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
hda: max request size: 128KiB
hda: 23572080 sectors (12068 MB) w/512KiB Cache, CHS=24944/15/63, UDMA(33)
/dev/ide/host0/bus0/target0/lun0: p1 p3
hdc: ATAPI 24X CD-ROM drive, 128kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12
video1394: Installed video1394 module
raw1394: /dev/raw1394 device initialized
PCI: Found IRQ 11 for device 0000:00:02.0
PCI: Sharing IRQ 11 with 0000:00:05.0
PCI: Sharing IRQ 11 with 0000:01:00.0
Yenta: CardBus bridge found at 0000:00:02.0 [1014:0130]
Yenta: Using INTVAL to route CSC interrupts to PCI
Yenta: Routing CardBus interrupts to PCI
Yenta: ISA IRQ list 04b8, PCI irq11
Socket status: 30000006
PCI: Found IRQ 11 for device 0000:00:02.1
Yenta: CardBus bridge found at 0000:00:02.1 [1014:0130]
Yenta: Using INTVAL to route CSC interrupts to PCI
Yenta: Routing CardBus interrupts to PCI
Yenta: ISA IRQ list 04b8, PCI irq11
Socket status: 30000006
ehci_hcd: block sizes: qh 128 qtd 96 itd 128 sitd 64
drivers/usb/host/uhci-hcd.c: USB Universal Host Controller Interface driver v2.1
PCI: Found IRQ 11 for device 0000:00:07.2
uhci_hcd 0000:00:07.2: UHCI Host Controller
uhci_hcd 0000:00:07.2: irq 11, io base 00001c20
uhci_hcd 0000:00:07.2: new USB bus registered, assigned bus number 1
drivers/usb/host/uhci-hcd.c: detected 2 ports
uhci_hcd 0000:00:07.2: root hub device address 1
usb usb1: new device strings: Mfr=3, Product=2, SerialNumber=1
drivers/usb/core/message.c: USB device number 1 default language ID 0x409
usb usb1: Product: UHCI Host Controller
usb usb1: Manufacturer: Linux 2.6.0-test11 uhci_hcd
usb usb1: SerialNumber: 0000:00:07.2
drivers/usb/core/usb.c: usb_hotplug
usb usb1: registering 1-0:1.0 (config #1, interface 0)
drivers/usb/core/usb.c: usb_hotplug
hub 1-0:1.0: usb_probe_interface
hub 1-0:1.0: usb_probe_interface - got id
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
hub 1-0:1.0: standalone hub
hub 1-0:1.0: ganged power switching
hub 1-0:1.0: global over-current protection
hub 1-0:1.0: Port indicators are not supported
hub 1-0:1.0: power on to power good time: 2ms
hub 1-0:1.0: hub controller current requirement: 0mA
hub 1-0:1.0: local power source is good
hub 1-0:1.0: no over-current condition exists
hub 1-0:1.0: enabling power on all ports
drivers/usb/core/usb.c: registered new driver usblp
drivers/usb/class/usblp.c: v0.13: USB Printer Device Class driver
drivers/usb/core/usb.c: registered new driver hiddev
drivers/usb/core/usb.c: registered new driver hid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
drivers/usb/core/usb.c: registered new driver usbserial
drivers/usb/serial/usb-serial.c: USB Serial Driver core v2.0
drivers/usb/serial/usb-serial.c: USB Serial support registered for Handspring Visor /
Palm OS
drivers/usb/serial/usb-serial.c: USB Serial support registered for Sony Clie 3.5
drivers/usb/core/usb.c: registered new driver visor
drivers/usb/serial/visor.c: USB HandSpring Visor / Palm OS driver v2.1
mice: PS/2 mouse device common for all mice
input: PS/2 Generic Mouse on isa0060/serio1
serio: i8042 AUX port at 0x60,0x64 irq 12
input: AT Translated Set 2 keyboard on isa0060/serio0
serio: i8042 KBD port at 0x60,0x64 irq 1
Bluetooth: HCI USB driver ver 2.4
drivers/usb/core/usb.c: registered new driver hci_usb
Advanced Linux Sound Architecture Driver Version 0.9.7 (Thu Sep 25 19:16:36 2003 UTC).
PCI: Found IRQ 11 for device 0000:00:05.0
PCI: Sharing IRQ 11 with 0000:00:02.0
PCI: Sharing IRQ 11 with 0000:01:00.0
cs46xx: failure waiting for FIFO command to complete
ALSA device list:
#0: Sound Fusion CS46xx at 0xe8100000/0xe8000000, irq 11
oprofile: using timer interrupt.
NET: Registered protocol family 2
IP: routing cache hash table of 4096 buckets, 32Kbytes
TCP: Hash tables configured (established 32768 bind 65536)
ip_conntrack version 2.1 (3071 buckets, 24568 max) - 300 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
NET: Registered protocol family 1
NET: Registered protocol family 17
Bridge firewalling registered
Ebtables v2.0 registered
IrCOMM protocol (Dag Brattli)
Bluetooth: L2CAP ver 2.1
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO (Voice Link) ver 0.3
Bluetooth: SCO socket layer initialized
Bluetooth: RFCOMM ver 1.0
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: BNEP (Ethernet Emulation) ver 1.0
Bluetooth: BNEP filters: protocol
802.1Q VLAN Support v1.8 Ben Greear <[EMAIL PROTECTED]>
All bugs added by David S. Miller <[EMAIL PROTECTED]>
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 160k freed
drivers/usb/host/uhci-hcd.c: 1c20: suspend_hc
EXT3 FS on hda3, internal journal
NTFS volume version 3.1.
cs: IO port probe 0x0c00-0x0cff: clean.
cs: IO port probe 0x0800-0x08ff: clean.
cs: IO port probe 0x0100-0x04ff: excluding 0x3c0-0x3df 0x4d0-0x4d7
cs: IO port probe 0x0a00-0x0aff: clean.
drivers/usb/host/uhci-hcd.c: 1c20: wakeup_hc
hub 1-0:1.0: port 1, status 301, change 1, 1.5 Mb/s
hub 1-0:1.0: debounce: port 1: delay 100ms stable 4 status 0x301
hub 1-0:1.0: new USB device on port 1, assigned address 2
usb 1-1: new device strings: Mfr=1, Product=2, SerialNumber=0
drivers/usb/core/message.c: USB device number 2 default language ID 0x9
usb 1-1: Product: USB test
usb 1-1: Manufacturer: Jalla jalla & co
drivers/usb/core/usb.c: usb_hotplug
usb 1-1: registering 1-1:1.0 (config #1, interface 0)
drivers/usb/core/usb.c: usb_hotplug
hid 1-1:1.0: usb_probe_interface
hid 1-1:1.0: usb_probe_interface - got id
drivers/usb/input/hid-core.c: ctrl urb status -32 received
devfs_mk_cdev: could not append to parent for input/event2
input: USB HID v1.11 Mouse [Jalla jalla & co USB test] on usb-0000:00:07.2-1
usbfs: process 3558 (lsusb) did not claim interface 0 before use
usbfs: process 3560 (lsusb) did not claim interface 0 before use
usb 1-1: usb_disable_device nuking non-ep0 URBs
uhci_hcd 0000:00:07.2: shutdown urb d443f980 pipe 40408280 ep1in-intr
usb 1-1: unregistering interface 1-1:1.0
usb 1-1: hcd_unlink_urb d443f980 fail -16
usb 1-1: hcd_unlink_urb d443fd40 fail -22
usb 1-1: hcd_unlink_urb d443f980 fail -16
drivers/usb/core/usb.c: usb_hotplug
Unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip:
c03db6c1
*pde = 00000000
Oops: 0000 [#1]
CPU: 0
EIP: 0060:[<c03db6c1>] Not tainted
EFLAGS: 00010246
EIP is at findintfif+0x21/0x70
eax: d4a00c00 ebx: d443f440 ecx: fffffff2 edx: 00000000
esi: 00000000 edi: 00000000 ebp: bffff8a4 esp: d39dff00
ds: 007b es: 007b ss: 0068
Process a (pid: 3562, threadinfo=d39de000 task=d3b84d20)
Stack: d443f440 8004550f d443f448 bffff8a4 c03dd326 d4a00c00 00000000 d443f440
c03ddbca d443f440 bffff8a4 ffffffe7 d41e55e0 d6888000 c032d781 d39dff5c
d41e55e0 40015000 00000018 00000018 00000018 40015018 c0333370 3fdedc43
Call Trace:
[<c03dd326>] proc_claiminterface+0x36/0x50
[<c03ddbca>] usbdev_ioctl+0x39a/0x3a0
[<c032d781>] tty_write+0x1b1/0x2d0
[<c0333370>] write_chan+0x0/0x250
[<c016bd85>] file_ioctl+0x75/0x200
[<c016c028>] sys_ioctl+0x118/0x2b0
[<c010b57b>] syscall_call+0x7/0xb
Code: 80 7a 04 00 89 d5 74 31 8b 44 b2 0c 31 c9 8b 58 08 39 d9 73
Bus 001 Device 002: ID 04d8:0001 Microchip Technology, Inc.
Language IDs: none (invalid length string descriptor bf; len=0)
string descriptor 1 invalid (bf bf; len=0)
string descriptor 2 invalid (bf bf; len=0)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04d8 Microchip Technology, Inc.
idProduct 0x0001
bcdDevice 0.00
iManufacturer 1
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 34
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 50
cannot get report descriptor
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 4
bInterval 10
Language IDs: none (invalid length string descriptor bf; len=0)
Bus 001 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000
idProduct 0x0000
bcdDevice 2.06
iManufacturer 3 Linux 2.6.0-test11 uhci_hcd
iProduct 2 UHCI Host Controller
iSerial 1 0000:00:07.2
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)
