def init_transfert_usb(self):
print ("initialisation du transfert usb <-> Mm")
for i in range(self.n_tdf):
self.transfert[i] = libusb1.libusb_alloc_transfer(0)
libusb1.libusb_fill_bulk_transfer(self.transfert[i], self.usbh.handle, self._ADDR, self.bbuffer_p[i],
self.s_pkt,
self.fn_callback_c, self.NULL, self.TIMEOUT)
retour = libusb1.libusb_submit_transfer(self.transfert[i])
if retour:
print ("Erreur " + str(retour) + " au lancement du paquet" + str(i))
# else:
# print "Pret a recevoir"
print ("initialisation du transfert usb <-> Mm .................... ok")
self.etat=1
def __init__(self, handle, iso_packets=0):
"""
You should not instanciate this class directly.
Call "getTransfer" method on an USBDeviceHandle instance to get
instances of this class.
"""
if iso_packets < 0:
raise ValueError('Cannot request a negative number of iso '
'packets.')
self.__handle = handle
self.__num_iso_packets = iso_packets
result = libusb1.libusb_alloc_transfer(iso_packets)
if not result:
raise libusb1.USBError('Unable to get a transfer object')
self.__transfer = result
self.__ctypesCallbackWrapper = libusb1.libusb_transfer_cb_fn_p(
self.__callbackWrapper)
def _getTransfer(self, iso_packets=0):
result = libusb1.libusb_alloc_transfer(iso_packets)
if not result:
raise libusb1.USBError, 'Unable to get a transfer object'
return result
import libusb1
max_packet_size = 256
NUM_ISO_PACKETS = 10
transfer_p = libusb1.libusb_alloc_transfer(NUM_ISO_PACKETS)
transfer = transfer_p.contents
transfer.num_iso_packets = NUM_ISO_PACKETS
libusb1.libusb_set_iso_packet_lengths( transfer_p,
max_packet_size )
