Adam,
Thanks for the reply.
I am using OTG host. lsusb reveals my intended target and libusb seems to write successfully (see attached libusb and usbmon output).
Any idea why there is no IN data (the device I am connected to will always respond to IN traffic).
Thanks
Brian
Linux 4.4.9
usblib 2.3
# lsusb
Bus 002 Device 003: ID 13b9:0095 <---- my device
Bus 002 Device 002: ID 0424:2512
Bus 002 Device 001: ID 1d6b:0002
Bus 001 Device 001: ID 1d6b:0002
Opening USB
Initializing USB
USB vid 5049 pid 149
[timestamp] [threadID] facility level [function call]
--------------------------------------------------------------------------------
[ 0.019561] [000000e6] libusb: debug [libusb_get_device_list]
[ 0.020080] [000000e6] libusb: debug [libusb_get_device_descriptor]
[ 0.020172] [000000e6] libusb: debug [libusb_open] open 2.3
[ 0.020935] [000000e6] libusb: debug [usbi_add_pollfd] add fd 14 events 4
[ 0.021331] [000000e6] libusb: debug [libusb_kernel_driver_active] interface 0
Device free from kernel
[ 0.021545] [000000e6] libusb: debug [libusb_claim_interface] interface 0
[ 0.024383] [000000e6] libusb: debug [libusb_set_interface_alt_setting] interface 0 altsetting 1
[ 0.030059] [000000e6] libusb: debug [add_to_flying_list] arm timerfd for timeout in 200ms (first in line)
[ 0.030273] [000000e6] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 4
[ 0.032379] [000000e6] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.032562] [000000e6] libusb: debug [handle_events] poll() 4 fds with timeout in 60000ms
[ 0.032684] [000000e6] libusb: debug [handle_events] poll() returned 1
[ 0.032775] [000000e6] libusb: debug [reap_for_handle] urb type=3 status=0 transferred=4
[ 0.032867] [000000e6] libusb: debug [handle_bulk_completion] handling completion status 0 of bulk urb 1/1
[ 0.032928] [000000e6] libusb: debug [handle_bulk_completion] last URB in transfer --> complete!
[ 0.032989] [000000e6] libusb: debug [disarm_timerfd]
[ 0.033050] [000000e6] libusb: debug [usbi_handle_transfer_completion] transfer 0x24ee0 has callback 0xb6f32b14
[ 0.033142] [000000e6] libusb: debug [sync_transfer_cb] actual_length=4 <---------- Good write?
[ 0.033233] [000000e6] libusb: debug [libusb_set_interface_alt_setting] interface 0 altsetting 1
[ 0.036377] [000000e6] libusb: debug [add_to_flying_list] arm timerfd for timeout in 400ms (first in line)
[ 0.036651] [000000e6] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 2
[ 0.037384] [000000e6] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.037506] [000000e6] libusb: debug [handle_events] poll() 4 fds with timeout in 60000ms
[ 0.437835] [000000e6] libusb: debug [handle_events] poll() returned 1
[ 0.438049] [000000e6] libusb: debug [handle_events] timerfd triggered
[ 0.438140] [000000e6] libusb: debug [libusb_cancel_transfer]
[ 0.439209] [000000e6] libusb: debug [disarm_timerfd]
[ 0.439361] [000000e6] libusb: debug [handle_events] poll() 4 fds with timeout in 0ms
[ 0.439453] [000000e6] libusb: debug [handle_events] poll() returned 1
[ 0.439544] [000000e6] libusb: debug [reap_for_handle] urb type=3 status=-2 transferred=0
[ 0.439605] [000000e6] libusb: debug [handle_bulk_completion] handling completion status -2 of bulk urb 1/1
[ 0.439666] [000000e6] libusb: debug [handle_bulk_completion] abnormal reap: urb status -2
[ 0.439727] [000000e6] libusb: debug [handle_bulk_completion] abnormal reap: last URB handled, reporting
[ 0.439788] [000000e6] libusb: debug [usbi_handle_transfer_cancellation] detected timeout cancellation
[ 0.439849] [000000e6] libusb: debug [disarm_timerfd]
[ 0.439941] [000000e6] libusb: debug [usbi_handle_transfer_completion] transfer 0x24ee0 has callback 0xb6f32b14
[ 0.440002] [000000e6] libusb: debug [sync_transfer_cb] actual_length=0 <----- No response
cca49cc0 818983770 S Co:2:003:0 s 01 0b 0001 0000 0000 0
cca49cc0 818984747 C Co:2:003:0 0 0
ccc38740 818988500 S Bo:2:003:1 -115 4 = 04006901
ccc38740 818989263 C Bo:2:003:1 0 4 > <---------- Good write?
ccc38740 818991888 S Co:2:003:0 s 01 0b 0001 0000 0000 0
ccc38740 818992071 C Co:2:003:0 0 0
ccc38740 818993841 S Bi:2:003:1 -115 2 <
ccc38740 819394628 C Bi:2:003:1 -2 <----- no response