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 = 2048 + 6 # include header and footer
   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             intf = config[(1,0)]
  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)
  33             for ep in intf:
  34                 if (ep.bmAttributes == 0x02):
  35                     if ep.bEndpointAddress == self.ep_in:
  36                         self.rx_ep = ep
  37                     elif ep.bEndpointAddress == self.ep_out:
  38                         self.tx_ep = ep
  39             return True
  40
  41         raise ValueError("Device does not have a serial interface")
  42
  43     def establish_connection(self):
  44         for i in range(self.max_tries):
  45             try:
  46                 self.tx_ep.write(bytes([0x00]), self.timeout_ms)
  47                 ret = self.rx_ep.read(1, self.timeout_ms)
  48                 if ret[0] == 0x00:
  49                     print("Reply ACK received (0x00)")
  50                     return True
  51             except usb.core.USBError as e:
  52                 print(f"Timeout: retry #{i}", e)
  53         return False
  54
  55     def confirm_connection(self):
  56         for i in range(self.max_tries):
  57             try:
  58                 self.tx_ep.write(bytes([0x55]), self.timeout_ms)
  59                 ret = self.rx_ep.read(1, self.timeout_ms)
  60                 if ret[0] == 0xC3:
  61                     print("Reply received (0xC3)")
  62                     return True
  63             except usb.core.USBError as e:
  64                 print(f"Timeout: retry #{i}", e)
  65         return False
  66
  67     def authenticate_connection(self):
  68         raise Exception("Not implemented")
  69
  70     def send_data(self, packed_data):
  71         if (self.tx_ep == None):
  72             return False
  73         try:
  74             self.tx_ep.write(packed_data, self.timeout_ms)
  75         except usb.core.USBError as e:
  76             print(f"Timeout: error", e)
  77             return False
  78         return True
  79
  80     def recv_data(self, exp_len, timeout=100):
  81         msg = bytearray(b'')
  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):
  85             return False
  86         try:
  87             received = 0
  88             while received != exp_len:
  89                 buf = self.rx_ep.read(exp_len, timeout)
  90                 msg += buf
  91                 received += len(buf)
  92                 if received == exp_len:
  93                     return msg
  94         except usb.core.USBError as e:
  95             print(f"Timeout: error", e)
  96         return msg