Hi,
I use a Nokia 515 connected via USB as a UMTS modem for my PC:
CPU0: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz (family: 0x6, model: 0x17, stepping: 0xa)
Output of lsusb -v -d for the device is attached.
The battery of the phone is old, and sometimes the phone just turns off.
Up intil recently (before 5.6.10) turning on the phone again would restore the connection.
But roughly since commits 0afccd7601514c4b83d8cc58c740089cc447051d and/or 4e7279cd1d19f48f0af2a10ed020febaa9ac092 the kernel gets an Oops and eventually the system hangs.
The behaviour is reproducible by taking out the battery from the phone during a connection.
Tested wtih 5.6.10, 5.6.14 and 5.7-rc6. The following dmesg output is from 5.7-rc6:
# connect USB cable to phone
[ 59.829803] usb 1-2: new high-speed USB device number 2 using ehci-pci
[ 59.981396] usb 1-2: New USB device found, idVendor=0421, idProduct=06d3, bcdDevice=10.34
[ 59.981399] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 59.981401] usb 1-2: Product: Nokia 515
[ 59.981403] usb 1-2: Manufacturer: Nokia
[ 59.981405] usb 1-2: SerialNumber: 357888058069763
[ 59.999766] cdc_acm 1-2:1.3: ttyACM1: USB ACM device
[ 60.168058] NET: Registered protocol family 35
[ 60.220317] usbcore: registered new interface driver cdc_phonet
[ 60.613363] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 60.627472] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 60.639107] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 60.639109] cfg80211: failed to load regulatory.db
[ 60.704801] usbcore: registered new interface driver cdc_ether
[ 60.733393] usb 1-2: bad CDC descriptors
[ 60.733721] usbcore: registered new interface driver rndis_host
[ 60.781979] usb 1-2: bad CDC descriptors
[ 60.782581] usbcore: registered new interface driver rndis_wlan
# remove USB cable from phone
[ 69.543818] usb 1-2: USB disconnect, device number 2
# connect USB cable to phone
[ 75.276486] usb 1-2: new high-speed USB device number 3 using ehci-pci
[ 75.427623] usb 1-2: New USB device found, idVendor=0421, idProduct=06d3, bcdDevice=10.34
[ 75.427626] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 75.427628] usb 1-2: Product: Nokia 515
[ 75.427630] usb 1-2: Manufacturer: Nokia
[ 75.427632] usb 1-2: SerialNumber: 357888058069763
[ 75.446969] cdc_acm 1-2:1.3: ttyACM1: USB ACM device
[ 75.447734] usb 1-2: bad CDC descriptors
[ 75.447819] usb 1-2: bad CDC descriptors
# remove battery from phone
[ 328.284229] usb 1-2: USB disconnect, device number 3
[ 328.308826] cdc_acm 1-2:1.3: failed to set dtr/rts
[ 332.757719] usb 1-2: new high-speed USB device number 4 using ehci-pci
[ 332.906985] usb 1-2: New USB device found, idVendor=0421, idProduct=067a, bcdDevice= 0.04
[ 332.906988] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 332.906990] usb 1-2: Product: NOKIA USB ROM
[ 332.906992] usb 1-2: Manufacturer: NOKIA
[ 334.033533] usb 1-2: USB disconnect, device number 4
# ... similar messages for device number 5 until 9
# insert battery into phone
[ 346.147723] usb 1-2: new high-speed USB device number 10 using ehci-pci
[ 346.297258] usb 1-2: New USB device found, idVendor=0421, idProduct=06d3, bcdDevice=10.34
[ 346.297261] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 346.297263] usb 1-2: Product: Nokia 515
[ 346.297265] usb 1-2: Manufacturer: Nokia
[ 346.297267] usb 1-2: SerialNumber: 357888058069763
[ 346.314973] cdc_acm 1-2:1.3: ttyACM1: USB ACM device
[ 346.315577] usb 1-2: bad CDC descriptors
[ 346.316096] usb 1-2: bad CDC descriptors
# switch on phone
[ 355.209929] BUG: unable to handle page fault for address: 000000003697c000
[ 355.209934] #PF: supervisor read access in kernel mode
[ 355.209936] #PF: error_code(0x0000) - not-present page
[ 355.209938] PGD 0 P4D 0
[ 355.209942] Oops: 0000 [#1] PREEMPT SMP PTI
[ 355.209945] CPU: 0 PID: 226 Comm: kworker/0:2 Not tainted 5.7.0-rc6 #1
[ 355.209947] Hardware name: Dell Inc. OptiPlex 755 /0GM819, BIOS A22 06/11/2012
[ 355.209956] Workqueue: events acm_softint [cdc_acm]
[ 355.209962] RIP: 0010:dev_vprintk_emit+0x57/0x1f8
[ 355.209965] Code: 20 00 00 00 48 89 54 24 08 65 48 8b 04 25 28 00 00 00 48 89 84 24 a0 00 00 00 31 c0 f3 ab 48 8b 86 b8 02 00 00 48 85 c0 74 05 <4c> 8b 28 eb 12 48 8b 56 60 31 c9 48 85 d2 0f 84 4e 01 00 00 4c 8b
[ 355.209967] RSP: 0018:ffffb38b40767c80 EFLAGS: 00010206
[ 355.209970] RAX: 000000003697c000 RBX: ffff9bbcb8e36020 RCX: 0000000000000000
[ 355.209972] RDX: ffffffff8b7afa65 RSI: ffff9bbcb8e36060 RDI: ffffb38b40767d20
[ 355.209974] RBP: ffffb38b40767db0 R08: ffff9bbcc475b800 R09: ffffb38b40767dc0
[ 355.209976] R10: 0000000000000003 R11: 0000000000000018 R12: ffff9bbcb8e367b0
[ 355.209978] R13: ffff9bbcb8e36020 R14: ffffb38b40767ca0 R15: ffff9bbcb8e36060
[ 355.209980] FS: 0000000000000000(0000) GS:ffff9bbcefe00000(0000) knlGS:0000000000000000
[ 355.209983] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 355.209985] CR2: 000000003697c000 CR3: 000000022b002000 CR4: 00000000000406f0
[ 355.209987] Call Trace:
[ 355.209995] dev_printk_emit+0x5e/0x75
[ 355.210000] ? __switch_to_asm+0x40/0x70
[ 355.210002] ? __switch_to_asm+0x34/0x70
[ 355.210004] ? __switch_to_asm+0x40/0x70
[ 355.210008] ? tty_port_lower_dtr_rts+0x20/0x20
[ 355.210011] _dev_err+0x7b/0x92
[ 355.210017] acm_submit_read_urb.cold+0x1c/0x25 [cdc_acm]
[ 355.210021] acm_softint+0x65/0xe0 [cdc_acm]
[ 355.210026] process_one_work+0x1da/0x3d0
[ 355.210030] worker_thread+0x4a/0x3d0
[ 355.210034] kthread+0x122/0x160
[ 355.210037] ? process_one_work+0x3d0/0x3d0
[ 355.210039] ? kthread_park+0x90/0x90
[ 355.210042] ret_from_fork+0x35/0x40
[ 355.210046] Modules linked in: ppp_deflate bsd_comp ppp_async ppp_generic slhc rndis_wlan rndis_host cdc_ether usbnet cfg80211 cdc_phonet phonet mii rfkill radeon snd_hda_codec_analog snd_hda_codec_generic ledtrig_audio coretemp snd_hda_codec_hdmi kvm_intel snd_hda_intel i2c_algo_bit snd_emu10k1 ttm snd_intel_dspcfg snd_hda_codec drm_kms_helper kvm snd_util_mem snd_ac97_codec snd_hda_core snd_rawmidi snd_seq_device cec ac97_bus snd_hwdep snd_pcm rc_core mousedev input_leds syscopyarea hid_generic ppdev mei_wdt iTCO_wdt sysfillrect iTCO_vendor_support pktcdvd snd_timer dcdbas cdc_acm irqbypass emu10k1_gp gameport e1000e sysimgblt usbhid pcspkr parport_pc evdev snd mei_me mac_hid fb_sys_fops hid soundcore mei parport lpc_ich intel_agp i2c_i801 intel_gtt acpi_cpufreq drm sg agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 uhci_hcd ata_generic floppy ehci_pci ehci_hcd sr_mod cdrom pata_acpi
[ 355.210097] CR2: 000000003697c000
[ 355.210101] ---[ end trace fbed6981d1f79e84 ]---
[ 355.210104] RIP: 0010:dev_vprintk_emit+0x57/0x1f8
[ 355.210107] Code: 20 00 00 00 48 89 54 24 08 65 48 8b 04 25 28 00 00 00 48 89 84 24 a0 00 00 00 31 c0 f3 ab 48 8b 86 b8 02 00 00 48 85 c0 74 05 <4c> 8b 28 eb 12 48 8b 56 60 31 c9 48 85 d2 0f 84 4e 01 00 00 4c 8b
[ 355.210109] RSP: 0018:ffffb38b40767c80 EFLAGS: 00010206
[ 355.210112] RAX: 000000003697c000 RBX: ffff9bbcb8e36020 RCX: 0000000000000000
[ 355.210114] RDX: ffffffff8b7afa65 RSI: ffff9bbcb8e36060 RDI: ffffb38b40767d20
[ 355.210116] RBP: ffffb38b40767db0 R08: ffff9bbcc475b800 R09: ffffb38b40767dc0
[ 355.210118] R10: 0000000000000003 R11: 0000000000000018 R12: ffff9bbcb8e367b0
[ 355.210120] R13: ffff9bbcb8e36020 R14: ffffb38b40767ca0 R15: ffff9bbcb8e36060
[ 355.210122] FS: 0000000000000000(0000) GS:ffff9bbcefe00000(0000) knlGS:0000000000000000
[ 355.210125] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 355.210127] CR2: 000000003697c000 CR3: 000000022b002000 CR4: 00000000000406f0
[ 355.602759] ------------[ cut here ]------------
[ 355.602766] WARNING: CPU: 0 PID: 0 at kernel/workqueue.c:1473 __queue_work+0x38a/0x430
[ 355.602768] Modules linked in: ppp_deflate bsd_comp ppp_async ppp_generic slhc rndis_wlan rndis_host cdc_ether usbnet cfg80211 cdc_phonet phonet mii rfkill radeon snd_hda_codec_analog snd_hda_codec_generic ledtrig_audio coretemp snd_hda_codec_hdmi kvm_intel snd_hda_intel i2c_algo_bit snd_emu10k1 ttm snd_intel_dspcfg snd_hda_codec drm_kms_helper kvm snd_util_mem snd_ac97_codec snd_hda_core snd_rawmidi snd_seq_device cec ac97_bus snd_hwdep snd_pcm rc_core mousedev input_leds syscopyarea hid_generic ppdev mei_wdt iTCO_wdt sysfillrect iTCO_vendor_support pktcdvd snd_timer dcdbas cdc_acm irqbypass emu10k1_gp gameport e1000e sysimgblt usbhid pcspkr parport_pc evdev snd mei_me mac_hid fb_sys_fops hid soundcore mei parport lpc_ich intel_agp i2c_i801 intel_gtt acpi_cpufreq drm sg agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 uhci_hcd ata_generic floppy ehci_pci ehci_hcd sr_mod cdrom pata_acpi
[ 355.602811] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D 5.7.0-rc6 #1
[ 355.602814] Hardware name: Dell Inc. OptiPlex 755 /0GM819, BIOS A22 06/11/2012
[ 355.602817] RIP: 0010:__queue_work+0x38a/0x430
[ 355.602820] Code: 72 96 75 a9 00 01 1f 00 75 0f 65 48 8b 3c 25 c0 8b 01 00 f6 47 24 20 75 25 0f 0b 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 <0f> 0b e9 bd fd ff ff 41 83 cc 02 48 8d 53 60 e9 a2 fd ff ff e8 fd
[ 355.602822] RSP: 0018:ffffb38b40003e70 EFLAGS: 00010002
[ 355.602825] RAX: ffff9bbcb8e36790 RBX: ffff9bbcefe32700 RCX: 0000000000000000
[ 355.602827] RDX: ffff9bbcb8e36798 RSI: 0000000000000000 RDI: 0000000000000001
[ 355.602829] RBP: 0000000000000025 R08: ffff9bbcee802238 R09: ffff9bbcee802260
[ 355.602831] R10: 0000000000000000 R11: ffffffff8ba4c6b8 R12: ffff9bbceec18e00
[ 355.602833] R13: 0000000000000000 R14: 0000000000000140 R15: ffff9bbcb8e36790
[ 355.602836] FS: 0000000000000000(0000) GS:ffff9bbcefe00000(0000) knlGS:0000000000000000
[ 355.602838] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 355.602840] CR2: 00007fc9ae17f000 CR3: 000000022b800000 CR4: 00000000000406f0
[ 355.602842] Call Trace:
[ 355.602846] <IRQ>
[ 355.602851] queue_work_on+0x36/0x40
[ 355.602856] __usb_hcd_giveback_urb+0x6f/0x120
[ 355.602859] usb_giveback_urb_bh+0xa6/0x100
[ 355.602864] tasklet_action_common.isra.0+0x5f/0x130
[ 355.602868] __do_softirq+0x111/0x34d
[ 355.602872] irq_exit+0xac/0xd0
[ 355.602875] do_IRQ+0x89/0x140
[ 355.602878] common_interrupt+0xf/0xf
[ 355.602880] </IRQ>
[ 355.602883] RIP: 0010:mwait_idle+0x80/0x200
[ 355.602886] Code: 8b 04 25 c0 8b 01 00 0f 01 c8 48 8b 00 a8 08 0f 85 74 01 00 00 e9 07 00 00 00 0f 00 2d 3b e5 43 00 31 c0 48 89 c1 fb 0f 01 c9 <e8> eb 39 ad ff 89 c5 66 66 66 66 90 65 48 8b 04 25 c0 8b 01 00 f0
[ 355.602888] RSP: 0018:ffffffff8ba03e80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdc
[ 355.602891] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 355.602893] RDX: 0000000000000000 RSI: 7fffffad34e49283 RDI: ffffffff8b815f90
[ 355.602895] RBP: 0000000000000000 R08: 00000066a171aa2e R09: 00000052d20f9e9b
[ 355.602897] R10: 0000000000000004 R11: 000000000008d19a R12: ffffffff8ba14840
[ 355.602899] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8ba14840
[ 355.602905] do_idle+0x204/0x270
[ 355.602909] cpu_startup_entry+0x19/0x20
[ 355.602913] start_kernel+0x85f/0x884
[ 355.602918] secondary_startup_64+0xb6/0xc0
[ 355.602923] ---[ end trace fbed6981d1f79e85 ]---
[ 362.628141] cdc_acm 1-2:1.3: failed to set dtr/rts
[ 372.634805] cdc_acm 1-2:1.4: urb 3 failed submission with -22
[ 382.648907] cdc_acm 1-2:1.4: urb 3 failed submission with -22
# ... similar messages every 10 sconds
I tried to use gdb for more info about the messages. But I'm a novice here. If more or different info is needed, I'm happy to provide it.
$ gdb drivers/usb/class/cdc-acm.o
(gdb) l *acm_softint+0x65
0x2665 is in acm_softint (/tmp/linux-5.7-rc6/drivers/usb/class/cdc-acm.c:587).
582 clear_bit(EVENT_RX_STALL, &acm->flags);
583 }
584 }
585
586 if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
587 for (i = 0; i < ACM_NR; i++)
588 if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
589 acm_submit_read_urb(acm, i, GFP_NOIO);
590 }
591
(gdb) l acm_submit_read_urb.cold
428 return 0;
429
430 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
431 if (res) {
432 if (res != -EPERM && res != -ENODEV) {
433 dev_err(&acm->data->dev,
434 "urb %d failed submission with %d\n",
435 index, res);
436 } else {
437 dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
(gdb) l *acm_submit_read_urb+0x1c
0x206c is in acm_submit_read_urb (/tmp/linux-5.7-rc6/arch/x86/include/asm/bitops.h:162).
157 }
158
159 static __always_inline bool
160 arch_test_and_clear_bit(long nr, volatile unsigned long *addr)
161 {
162 return GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(btr), *addr, c, "Ir", nr);
163 }
164
165 /*
166 * Note: the operation is performed atomically with respect to
Regards,
Jean Rene Dawin
Bus 001 Device 017: ID 0421:06d3 Nokia Mobile Phones Nokia 515
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0421 Nokia Mobile Phones
idProduct 0x06d3
bcdDevice 10.34
iManufacturer 1 Nokia
iProduct 2 Nokia 515
iSerial 3 357888058069763
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0124
bNumInterfaces 9
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 8 Wireless Handset Control
bInterfaceProtocol 0
iInterface 0
CDC Header:
bcdCDC 1.10
CDC WHCM:
bcdVersion 1.00
CDC Union:
bMasterInterface 0
bSlaveInterface 1 2 3 4 5 6 7 8
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 254
bInterfaceProtocol 0
iInterface 0
CDC Header:
bcdCDC 1.10
UNRECOGNIZED CDC: 05 24 ab 05 71
CDC Union:
bMasterInterface 1
bSlaveInterface 2
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
** UNRECOGNIZED: 04 24 fd 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x06
sends break
line coding and serial state
CDC Call Management:
bmCapabilities 0x03
call management
use DataInterface
bDataInterface 4
CDC Union:
bMasterInterface 3
bSlaveInterface 4
UNRECOGNIZED CDC: 04 24 fd 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 9
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
** UNRECOGNIZED: 04 24 fd 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 5
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 11 OBEX
bInterfaceProtocol 0
iInterface 0
CDC Header:
bcdCDC 1.10
CDC OBEX:
bcdVersion 1.00
CDC Union:
bMasterInterface 5
bSlaveInterface 6
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 6
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 6
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
** UNRECOGNIZED: 04 24 fd 01
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 7
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 255 Vendor Specific (MSFT RNDIS?)
iInterface 0
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x06
sends break
line coding and serial state
CDC Call Management:
bmCapabilities 0x03
call management
use DataInterface
bDataInterface 8
CDC Union:
bMasterInterface 7
bSlaveInterface 8
UNRECOGNIZED CDC: 04 24 fd 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 11
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 8
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
** UNRECOGNIZED: 04 24 fd 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x86 EP 6 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
