Comments (6)
filinvadim
commented on July 17, 2024
1
BTW Mac has same problem but it hasn't udev rules
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zagrodzki
commented on July 17, 2024
Please send the output with ctx.Debug(4) added before a call to OpenDevices. What platform are you running on?
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minhajakhterkhan199
commented on July 17, 2024
development environment is Ubuntu 64. Please find the output below
--------------------------------------------------------------------------------
[ 0.732632] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.732665] [0000199a] libusb: debug [handle_events] poll fds modified, reallocating
[ 0.732691] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[ 0.733536] [000019a0] libusb: debug [linux_udev_event_thread_main] udev event thread entering.
[ 3.806486] [0000199a] libusb: debug [handle_events] poll() returned 0
[ 4.822469] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 4.822494] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[ 4.822474] [00001993] libusb: debug [libusb_get_device_list]
[ 4.822594] [00001993] libusb: debug [libusb_get_device_descriptor]
[ 4.822637] [00001993] libusb: debug [libusb_get_config_descriptor] index 0
[ 5.399340] [0000199a] libusb: debug [handle_events] poll() returned 0
[ 5.916213] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 5.916229] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[ 7.147556] [0000199a] libusb: debug [handle_events] poll() returned 0
[ 7.147578] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 7.147582] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[ 7.147745] [00001993] libusb: debug [libusb_open] open 1.5
[ 7.147822] [00001993] libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/001/005: Permission denied
[ 7.147827] [00001993] libusb: error [_get_usbfs_fd] libusb requires write access to USB device nodes.
[ 7.147829] [00001993] libusb: debug [libusb_open] open 1.5 returns -3
[ 9.406398] [0000199a] libusb: debug [handle_events] poll() returned 0
[ 9.406423] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 9.406426] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[ 9.409305] [00001993] libusb: debug [libusb_get_device_descriptor]
[ 9.409330] [00001993] libusb: debug [libusb_get_config_descriptor] index 0
[10.896267] [00001993] libusb: debug [libusb_get_device_descriptor]
[10.896296] [00001993] libusb: debug [libusb_get_config_descriptor] index 0
[10.898191] [0000199a] libusb: debug [handle_events] poll() returned 0
[10.898284] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[10.898293] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[11.809498] [0000199a] libusb: debug [handle_events] poll() returned 0
[11.809520] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[11.809525] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[14.275903] [0000199a] libusb: debug [handle_events] poll() returned 0
[14.275981] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[14.275985] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[16.427548] [0000199a] libusb: debug [handle_events] poll() returned 0
[16.427600] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[16.427606] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
[17.309986] [0000199a] libusb: debug [handle_events] poll() returned 0
[17.310024] [0000199a] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[17.310028] [0000199a] libusb: debug [handle_events] poll() 2 fds with timeout in 100ms
2017/10/01 13:08:02 list: libusb: bad access [code -3]```
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zagrodzki
commented on July 17, 2024
This is the relevant part:
[ 7.147822] [00001993] libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/001/005: Permission denied
[ 7.147827] [00001993] libusb: error [_get_usbfs_fd] libusb requires write access to USB device nodes.
[ 7.147829] [00001993] libusb: debug [libusb_open] open 1.5 returns -3
The user you're running as does not have permissions to access that USB device. You'll need to update the udev rules or change device permissions in some other way.
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minhajakhterkhan199
commented on July 17, 2024
Thanks for your prompt response issue fixed!
Kindly give me example / source code, how to write & read data on USB interface.
In this regards, waiting for your response.
Best Regards,
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zagrodzki
commented on July 17, 2024
See https://godoc.org/github.com/google/gousb#pkg-examples and https://github.com/google/gousb/tree/master/rawread for examples.
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