LibUSB driver issues: timeout - c

Question

I am attempting to write a linux driver for a printer. I have run USBSnoop on windows XP and obtained the log. In this log it sets wMaxPacketSize to 1026. After i set the interface i get the response of 75 bytes. If i set it to 64 (in the lsusb output) i obviously only get 64 bytes back.
My issue is on a bulk transfer to/from the device i get timeouts. I think i have the same problem as here: http://libusb.6.n5.nabble.com/libusb-bulk-transfer-return-timeout-error-and-transferred-set-to-0-td5712761.html
I performed the libusb_clear_halt() and i get a similar result to the linked post above. Down the bottom of it says "split buffer into 64 bytes manually" to solve it. My question is how to split the packets? This is my first time using LibUSB.
Here is the output of lsusb -v
Bus 002 Device 009: ID 07ce:c000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 7 Printer
bDeviceSubClass 1 Printer
bDeviceProtocol 2 Bidirectional
bMaxPacketSize0 64
idVendor 0x07ce
idProduct 0xc000
bcdDevice 1.00
iManufacturer 1 COPAL
iProduct 2 COPAL USB Printer
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 200mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 7 Printer
bInterfaceSubClass 1 Printer
bInterfaceProtocol 2 Bidirectional
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 0.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 0
bNumConfigurations 0
Device Status: 0x0001
Self Powered
Edit: this was in the dmesg
usb 2-1.1: new high-speed USB device number 9 using ehci_hcd
usb 2-1.1: config 1 interface 0 altsetting 0 bulk endpoint 0x1 has invalid maxpacket 64
usb 2-1.1: config 1 interface 0 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 64
Edit: I think it may be that linux is getting in the way. On wireshark and i can see the packets come back correctly but not calling my callback function. I already removed the usblp driver. Any ideas?

Answer 1

Got a similar problem. Haven't figured out why I get the timeout errors, yet. Though it seems like they occur much more often for larger package sizes. If you want to split your package, just write yourself a function that splits your large buffer[1024] into packages of 64 bytes, then do a loop that always takes the next 64 bytes from the buffer, puts it in a small_buffer[64] and sends them via usb.