def relance_transfert(self, transfer_i):
"""
relance (ou pas) le transfert du buffer courant
:param transfer_i:
:return:
"""
# calcul du numero du pkt si on le relance
id_futur = self.num_pkt + self.n_tdf
if id_futur == self.n_pkt - 1:
# le paquet sera le dernier de la liste :
# avant de le relancer, il faut changer la taille du buffer attendu
# on allonge egalement la taille du timeout pour avoir le temps de lancer l instruction packend
libusb1.libusb_fill_bulk_transfer(transfer_i, self.usbh.handle, self._ADDR,
self.bbuffer_p[self.num_pkt % self.n_tdf],
self.s_l_pkt, self.fn_callback_c, NULL, 10 * self.TIMEOUT)
# on relance le transfert
retour = libusb1.libusb_submit_transfer(transfer_i)
if retour:
print (".....Erreur " + str(retour) + " au lancement transfert du dernier paquet " + str(self.num_pkt))
# else:
# print "dernier paquet, s_pkt = " + str(self.s_l_pkt)
elif id_futur < self.n_pkt - 1:
# le paquet sera un paquet (normal) dans la liste :
# on relance le transfert
retour = libusb1.libusb_submit_transfer(transfer_i)
if retour:
print (".....Erreur " + str(retour) + " au lancement du paquet " + str(self.num_pkt))
# else:
# print "paquet standard"
elif id_futur > self.n_pkt - 1 or self.etat==0:
# le paquet ne sera pas un paquet de la liste :
# on ne relance pas le transfert
pass
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 setBulk(self, endpoint, buffer_or_len, callback=None, user_data=None,
timeout=0):
"""
Setup transfer for bulk use.
endpoint: endpoint to submit transfer to (implicitly sets transfer
direction).
buffer_or_len: either a string (when sending data), or expected data
length (when receiving data)
callback: function to call upon event. Called with transfer as
parameter, return value ignored.
user_data: to pass some data to/from callback
timeout: in milliseconds, how long to wait for devices acknowledgement
or data. Set to 0 to disable.
"""
if self.__submitted:
raise ValueError('Cannot alter a submitted transfer')
string_buffer = create_binary_buffer(buffer_or_len)
self.__initialized = False
libusb1.libusb_fill_bulk_transfer(self.__transfer, self.__handle,
endpoint, string_buffer, sizeof(string_buffer),
self.__ctypesCallbackWrapper, user_data, timeout)
self.__callback = callback
self.__initialized = True
def fillBulkTransfer(self, transfer, endpoint, string_buffer,
callback, user_data, timeout):
libusb1.libusb_fill_bulk_transfer(transfer, self.handle,
endpoint, string_buffer, sizeof(string_buffer),
libusb1.libusb_transfer_cb_fn_p(callback), user_data,
timeout)
