6 MAX_TRANSFER_SIZE = 2048 + 6 # include header and footer
9 def __init__(self, vendor_id, product_id):
10 self.vendor_id = vendor_id
11 self.product_id = product_id
21 def find_device(self):
22 self.dev = usb.core.find(idVendor=self.vendor_id, idProduct=self.product_id)
24 raise ValueError(f"Device {self.vendor_id}:{self.product_id} not found\nAre you sure it is connected?")
26 for config in self.dev:
28 product_name = usb.util.get_string(self.dev, self.dev.iProduct)
29 print(f'Found {product_name} ({self.vendor_id}:{self.product_id})')
30 if self.dev.is_kernel_driver_active(intf.bInterfaceNumber):
31 print("Found kernel driver, detaching ... ")
32 self.dev.detach_kernel_driver(intf.bInterfaceNumber)
34 if (ep.bmAttributes == 0x02):
35 if ep.bEndpointAddress == self.ep_in:
37 elif ep.bEndpointAddress == self.ep_out:
41 raise ValueError("Device does not have a serial interface")
43 def establish_connection(self):
44 for i in range(self.max_tries):
46 self.tx_ep.write(bytes([0x00]), self.timeout_ms)
47 ret = self.rx_ep.read(1, self.timeout_ms)
49 print("Reply ACK received (0x00)")
51 except usb.core.USBError as e:
52 print(f"Timeout: retry #{i}", e)
55 def confirm_connection(self):
56 for i in range(self.max_tries):
58 self.tx_ep.write(bytes([0x55]), self.timeout_ms)
59 ret = self.rx_ep.read(1, self.timeout_ms)
61 print("Reply received (0xC3)")
63 except usb.core.USBError as e:
64 print(f"Timeout: retry #{i}", e)
67 def authenticate_connection(self):
68 raise Exception("Not implemented")
70 def send_data(self, packed_data):
71 if (self.tx_ep == None):
74 self.tx_ep.write(packed_data, self.timeout_ms)
75 except usb.core.USBError as e:
76 print(f"Timeout: error", e)
80 def recv_data(self, exp_len, timeout=100):
82 if (exp_len > MAX_TRANSFER_SIZE):
83 raise ValueError(f"length package {exp_len} over max transfer size")
84 if (self.rx_ep == None):
88 while received != exp_len:
89 buf = self.rx_ep.read(exp_len, timeout)
92 if received == exp_len:
94 except usb.core.USBError as e:
95 print(f"Timeout: error", e)