Hi,I just trying to do a simple bulk read, and always got a TIMEOUT, would any one please tell me what I did wrong here?
Here is my code: Thanks in advance. John I also attached the USBTrace different between Windows API call vs LibsUSB Call, please remove the .remove from the WinAPIvsLibUSBCall Trace Difference.html.remove<https://mail.google.com/mail/?ui=2&ik=699f5912f2&view=att&th=1396599ed6d4a356&attid=0.1&disp=safe&realattid=f_h6cv4bg90&zw> void LIBUSB_CALL LibUSBDevice::ReadCallback(struct libusb_transfer *transfer) { CallBackData* data =(CallBackData*)transfer->user_data; data->ByteTransfered=transfer->actual_length; data->ErrorCode==transfer->status; data->ExitTransfer=true; } ErrNo LibUSBDevice::BulkRead( const ULONG c_ulPipeNum, // IN const uint c_uiLength, // IN DWORD* bytesRead, // IN uint* pbBuffer, // IN HANDLE cancelEvent) { const ULONG endpoint=0x80+c_ulPipeNum*2; CallBackData* userdata=new CallBackData(); userdata->ExitTransfer=false; int err =0; libusb_transfer* transfer =libusb_alloc_transfer(0); if (!transfer) { err=-ENOMEM; return NULL; } unsigned char* buffer=new unsigned char[c_uiLength]; libusb_fill_bulk_transfer (transfer,m_handle,endpoint,buffer, c_uiLength,LibUSBDevice:: ReadCallback ,userdata,ITP_TRANSFER_TIMEOUT); if (!err) { err = libusb_claim_interface(this->m_handle, 0); int cnt=0; err=libusb_submit_transfer(transfer); while (!userdata->ExitTransfer) { struct timeval tv = { 1, 0 }; err = libusb_handle_events_timeout(NULL, &tv); cout << ++cnt << " call libusb_handle_events_timeout" << std::endl; if (err<0) break; } } if (err < 0) { const char* errmsg=libusb_error_name(err); std::cerr << "Error!" << err << std::endl; libusb_cancel_transfer(transfer); libusb_handle_events(NULL) ; } for (int i=0;i<c_uiLength;i++) { pbBuffer[i]=static_cast<unsigned int>(buffer[i]); } libusb_release_interface(m_handle,0); return err; } Debug Trace. [30.617751] [00001f2c] libusbx: debug [libusb_claim_interface] interface 0 [30.617751] [00001f2c] libusbx: debug [winusb_claim_interface] claimed interface 0 [30.618751] [00001f2c] libusbx: debug [libusb_get_config_descriptor] index 0 [30.618751] [00001f2c] libusbx: debug [windows_assign_endpoints] (re)assigned endpoint 01 to interface 0 [30.618751] [00001f2c] libusbx: debug [windows_assign_endpoints] (re)assigned endpoint 02 to interface 0 [30.619751] [00001f2c] libusbx: debug [windows_assign_endpoints] (re)assigned endpoint 04 to interface 0 [30.619751] [00001f2c] libusbx: debug [windows_assign_endpoints] (re)assigned endpoint 86 to interface 0 [30.619751] [00001f2c] libusbx: debug [windows_assign_endpoints] (re)assigned endpoint 88 to interface 0 [30.620751] [00001f2c] libusbx: debug [winusb_submit_bulk_transfer] matched endpoint 88 with interface 0 [30.620751] [00001f2c] libusbx: debug [winusb_submit_bulk_transfer] reading 30 bytes [30.620751] [00001f2c] libusbx: debug [usbi_add_pollfd] add fd 5 events 1 [30.621751] [00001f2c] libusbx: debug [libusb_get_next_timeout] next timeout in 2.999092s [30.621751] [00001f2c] libusbx: debug [libusb_handle_events_timeout_completed] doing our own event handling [30.621751] [00001f2c] libusbx: debug [handle_events] poll() 2 fds with timeout in 1000ms [31.621808] [00001f2c] libusbx: debug [handle_events] poll() returned 0 1 call libusb_handle_events_timeout [31.626809] [00001f2c] libusbx: debug [libusb_get_next_timeout] next timeout in 1.993924s [31.627809] [00001f2c] libusbx: debug [libusb_handle_events_timeout_completed] doing our own event handling [31.628809] [00001f2c] libusbx: debug [handle_events] poll() 2 fds with timeout in 1000ms [40.662325] [00001f2c] libusbx: debug [handle_events] poll() returned 0 [40.662325] [00001f2c] libusbx: debug [libusb_cancel_transfer] [40.662325] [00001f2c] libusbx: debug [winusb_abort_transfers] will use interface 0 2 call libusb_handle_events_timeout [40.668326] [00001f2c] libusbx: debug [libusb_get_next_timeout] no URB with timeout or all handled by OS; no timeout! [40.668326] [00001f2c] libusbx: debug [libusb_handle_events_timeout_completed] doing our own event handling [40.669326] [00001f2c] libusbx: debug [handle_events] poll() 2 fds with timeout in 1000ms [40.669326] [00001f2c] libusbx: debug [handle_events] poll() returned 1 [40.670326] [00001f2c] libusbx: debug [windows_handle_events] checking fd 3 with revents = 0000 [40.670326] [00001f2c] libusbx: debug [windows_handle_events] checking fd 5 with revents = 0001 [40.671326] [00001f2c] libusbx: debug [usbi_remove_pollfd] remove fd 5 [40.671326] [00001f2c] libusbx: debug [windows_transfer_callback] handling I/O completion with errcode 995 [40.671326] [00001f2c] libusbx: debug [windows_transfer_callback] detected timeout [40.672326] [00001f2c] libusbx: debug [usbi_handle_transfer_completion] transfer 0032C830 has callback 012A5DFC 3 call libusb_handle_events_timeout [44.476544] [00001f2c] libusbx: debug [libusb_release_interface] interface 0
WinAPIvsLibUSBCall Trace Difference.html.remove
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