Hello,
I'm trying to do some bulk IO with a custom USB device on OSX and fail
miserably. This is the small source code which just tries to write a few
bytes to a bulk endpoint:
#include <stdio.h>
#include <libusb-1.0/libusb.h>
int main()
{
libusb_context *ctx;
libusb_device_handle *handle;
libusb_init(&ctx);
libusb_set_debug(ctx, 3);
handle = libusb_open_device_with_vid_pid(ctx, 0x16c0, 0x05dc);
libusb_set_configuration(handle, 1);
libusb_claim_interface(handle, 0);
unsigned char *write_data = "\1Test\0";
int written;
if (libusb_bulk_transfer(handle, 0x04, write_data, 6, &written, 2000))
{
printf("write failed\n");
return 1;
}
printf("%i bytes written\n", written);
libusb_release_interface(handle, 0);
libusb_close(handle);
libusb_exit(ctx);
return 0;
}
The program runs fine on Linux but when I try it on OSX (with the same
USB device) then the libusb_bulk_transfer call fails with
LIBUSB_ERROR_PIPE and the following debug messages:
[00000707] libusbx: debug [darwin_open] device open for access
[00000707] libusbx: debug [libusb_set_configuration] configuration 1
[00000707] libusbx: debug [libusb_claim_interface] interface 0
[00000707] libusbx: debug [get_endpoints] building table of endpoints.
[00000707] libusbx: debug [get_endpoints] interface: 0 pipe 1: dir: 1
number: 4
[00000707] libusbx: debug [get_endpoints] interface: 0 pipe 2: dir: 0
number: 4
[00000707] libusbx: debug [darwin_claim_interface] interface opened
[00000707] libusbx: debug [ep_to_pipeRef] converting ep address 0x04 to
pipeRef and interface
[00000707] libusbx: debug [ep_to_pipeRef] pipe 2 on interface 0 matches
[00000707] libusbx: debug [libusb_get_next_timeout] no URB with timeout
or all handled by OS; no timeout!
[00000707] libusbx: debug [libusb_handle_events_timeout_completed] doing
our own event handling
[00000707] libusbx: debug [handle_events] poll() 2 fds with timeout in
60000ms
[00001607] libusbx: debug [darwin_async_io_callback] an async io
operation has completed
[00000707] libusbx: debug [handle_events] poll() returned 1
[00000707] libusbx: debug [op_handle_events] checking fd 4 with revents = 0
[00000707] libusbx: debug [op_handle_events] checking fd 6 with revents = 1
[00000707] libusbx: debug [darwin_handle_callback] handling bulk
completion with kernel status -536854449
[00000707] libusbx: debug [darwin_transfer_status] transfer error: pipe
is stalled
[00000707] libusbx: debug [usbi_handle_transfer_completion] transfer
0x7ff89a4099f0 has callback 0x10a889190
[ 0.557680] [00000707] libusbx: debug [bulk_transfer_cb] actual_length=0
I'm confused. If I'm doing something wrong here or when the USB device
is doing something wrong then why does it work on Linux? Is there
anything wrong in my code which can cause this error only on OSX? On OSX
I'm using libusbx-1.0.14 while on Linux I'm using the libusb package
shipped with Ubuntu (libusbx-1.0.12).
Any help is highly appreciated.
--
Bye, K <http://www.ailis.de/~k/>
[A735 47EC D87B 1F15 C1E9 53D3 AA03 6173 A723 E391]
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