Android and libusb. How to access USB?

Asked Jul 09 '14 at 11:53

Active Jul 12 '19 at 09:35

Viewed 680 times

I try to use libusb in my Android project. I can use some libusb functions (such as libusb_init, libusb_get_device_list, etc.), but when I try to execute libusb_open I get LIBUSB_ERROR_ACCES. I have performed the all tips from the libusb documentation (added /dev/bus/usb// into ueventd.rc, got the root into application, got permissions in Java), but nothing helped me.

I have the rooted the Android device (odroid-xu).

edited Jul 10 '14 at 13:57

Peter Mortensen

30,738
21
105
131

asked Jul 09 '14 at 11:53

user3820231

Do you have USB host in your device? – Display Name Jul 09 '14 at 11:54
Of cause. And I already have written the java app, but the data exchange is not fast enough, so I want to use ndk and libusb. – user3820231 Jul 10 '14 at 04:30
Did you prove that the bottleneck is Java? – Display Name Jul 10 '14 at 07:19
I guess the size of the buffer. I get data by chunks which max size is 16384 bytes. – user3820231 Jul 10 '14 at 07:32
so what's the problem with using Java? – Display Name Jul 10 '14 at 07:36
While I read data from usb device, it will be overwritten by the following. – user3820231 Jul 10 '14 at 07:42
"got the root into application" suggests a conceptual error - root only (at most) applies to helper executables, never an application process itself. – Chris Stratton Jul 10 '14 at 15:05
But how can I get access? – user3820231 Jul 10 '14 at 17:09

Android and libusb. How to access USB?

0 Answers0