robinkrens.nl - git repository - renesas-ra-flasher/blob - src/RAConnect.py

   1 import sys
   2 import time
   3 import usb.core
   4 import usb.util
   5
   6 MAX_TRANSFER_SIZE = 64
   7
   8 class RAConnect:
   9     def __init__(self, vendor_id, product_id):
  10         self.vendor_id = vendor_id
  11         self.product_id = product_id
  12         self.ep_in = 0x81
  13         self.ep_out = 0x02
  14         self.max_tries = 20
  15         self.timeout_ms = 100
  16         self.dev = None
  17         self.rx_ep = None
  18         self.tx_ep = None
  19         self.find_device()
  20
  21     def find_device(self):
  22         self.dev = usb.core.find(idVendor=self.vendor_id, idProduct=self.product_id)
  23         if self.dev is None:
  24             raise ValueError(f"Device {self.vendor_id}:{self.product_id} not found\nAre you sure it is connected?")
  25
  26         for config in self.dev:
  27             #print(config)
  28             intf = config[(1,0)]
  29             #for intf in config:
  30
  31                 #if usb.util.find_descriptor(config, custom_match=lambda d: (d.bInterfaceClass == 0xa or d.bInterfaceClass == 0xBB)):
  32             print("Found serial device with 0x0a | 0xFF")
  33             if self.dev.is_kernel_driver_active(intf.bInterfaceNumber):
  34                 print("Found kernel driver, detaching ... ")
  35                 self.dev.detach_kernel_driver(intf.bInterfaceNumber)
  36             for ep in intf:
  37                 #print("=========")
  38                 #print(ep)
  39                 if (ep.bmAttributes == 0x02):
  40                     if ep.bEndpointAddress == self.ep_in:
  41                         self.rx_ep = ep
  42                         print(ep)
  43                     elif ep.bEndpointAddress == self.ep_out:
  44                         self.tx_ep = ep
  45                         print(ep)
  46             return True
  47
  48         raise ValueError("Device does not have a serial interface")
  49
  50     def establish_connection(self):
  51         for i in range(self.max_tries):
  52             try:
  53                 self.tx_ep.write(bytes([0x00]), self.timeout_ms)
  54                 ret = self.rx_ep.read(1, self.timeout_ms)
  55                 if ret[0] == 0x00:
  56                     print("Reply ACK received (0x00)")
  57                     return True
  58             except usb.core.USBError as e:
  59                 print(f"Timeout: retry #{i}", e)
  60         return False
  61
  62     def confirm_connection(self):
  63         for i in range(self.max_tries):
  64             try:
  65                 self.tx_ep.write(bytes([0x55]), self.timeout_ms)
  66                 ret = self.rx_ep.read(1, self.timeout_ms)
  67                 if ret[0] == 0xC3:
  68                     print("Reply received (0xC3)")
  69                     return True
  70             except usb.core.USBError as e:
  71                 print(f"Timeout: retry #{i}", e)
  72         return False
  73
  74     def authenticate_connection(self):
  75         raise Exception("Not implemented")
  76
  77     def send_data(self, packed_data):
  78         if (self.tx_ep == None):
  79             return False
  80         try:
  81             self.tx_ep.write(packed_data, self.timeout_ms)
  82         except usb.core.USBError as e:
  83             print(f"Timeout: error", e)
  84             return False
  85         return True
  86
  87     # packets are length 7, except for a read package
  88     def recv_data(self, exp_len):
  89         msg = bytearray(b'')
  90         if (exp_len > MAX_TRANSFER_SIZE):
  91             raise ValueError(f"length package {exp_len} over max transfer size")
  92         if (self.rx_ep == None):
  93             return False
  94         try:
  95             received = 0
  96             while received != exp_len:
  97                 buf = self.rx_ep.read(exp_len, self.timeout_ms)
  98                 msg += buf
  99                 print(buf, len(buf))
 100                 received += len(buf)
 101                 if received == exp_len:
 102                     return msg
 103         except usb.core.USBError as e:
 104             print(f"Timeout: error", e)
 105             #return False
 106         return msg
 107
 108
 109 #communicator = RAConnect(vendor_id=0x1a86, product_id=0x7523)
 110
 111 #communicator.send_data(b'\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA')
 112 #communicator.recv_data(7)
 113
 114 #if not communicator.establish_connection():
 115 #    print("Cannot connect")
 116 #    sys.exit(0)
 117 #
 118 #if not communicator.confirm_connection():
 119 #    print("Failed to confirm boot code")
 120 #    sys.exit(0)
 121