On Aug 20, 2014, at 11:07 AM, Shen Chuan <s...@minutekey.com> wrote: > Hello, > > Just installed libhid in the opensuse platform and running a c program to > communicate with the card reader > > i | libhidapi-devel | Development libraries and header files for hidapi > | package > i | libhidapi-hidraw0 | Simple library for communicating with USB and > Bluetooth HID devices | package > i | libhidapi-libusb0 | Simple library for communicating with USB and > Bluetooth HID devices | package > > But when I run it, it always give me 13 error code. Not sure what it means, > is there somewhere I can debug it?
You could try running it under strace to see the return values from the system calls. If the 13 is coming from a system call, strace will show the symbolic error name. > hid_force_open failed with return code 13 There are at least three separate HID APIs for Linux: 1) http://libhid.alioth.debian.org/ (defunct; uses this list) 2) the Linux kernel HID API, sometimes called hidraw 3) http://www.signal11.us/oss/hidapi/ (also https://github.com/signal11/hidapi) which corresponds to those packages I am not too familiar with #2 and #3. If it is #3, you should be able to look up that error code in their Doxygen output: http://www.signal11.us/oss/hidapi/hidapi/doxygen/html/group__API.html If it is #2, error 13 is EACCESS, so you might want to check permissions on /dev/bus/usb. HIDAPI might also be passing that error code through to you from the kernel HID API. -- Charles Lepple clepple@gmail
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