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 from RAPacker import *
   6
   7 MAX_TRANSFER_SIZE = 2048 + 6 # include header and footer
   8
   9 class RAConnect:
  10     def __init__(self, vendor_id, product_id):
  11         self.vendor_id = vendor_id
  12         self.product_id = product_id
  13         self.ep_in = 0x81
  14         self.ep_out = 0x02
  15         self.max_tries = 20
  16         self.timeout_ms = 100
  17         self.dev = None
  18         self.rx_ep = None
  19         self.tx_ep = None
  20         self.chip_layout = []
  21         self.sel_area = 0 # default to Area 0
  22
  23         self.find_device()
  24         status_conn = self.inquire_connection()
  25         if not status_conn:
  26             self.confirm_connection()
  27
  28     def find_device(self):
  29         self.dev = usb.core.find(idVendor=self.vendor_id, idProduct=self.product_id)
  30         if self.dev is None:
  31             raise ValueError(f"Device {self.vendor_id}:{self.product_id} not found\nAre you sure it is connected?")
  32
  33         for config in self.dev:
  34             intf = config[(1,0)]
  35             product_name = usb.util.get_string(self.dev, self.dev.iProduct)
  36             print(f'Found {product_name} ({self.vendor_id}:{self.product_id})')
  37             if self.dev.is_kernel_driver_active(intf.bInterfaceNumber):
  38                 print("Found kernel driver, detaching ... ")
  39                 self.dev.detach_kernel_driver(intf.bInterfaceNumber)
  40             for ep in intf:
  41                 if (ep.bmAttributes == 0x02):
  42                     if ep.bEndpointAddress == self.ep_in:
  43                         self.rx_ep = ep
  44                     elif ep.bEndpointAddress == self.ep_out:
  45                         self.tx_ep = ep
  46             return True
  47
  48         raise ValueError("Device does not have a CDC interface")
  49
  50
  51     def inquire_connection(self):
  52         packed = pack_pkt(INQ_CMD, "")
  53         self.send_data(packed)
  54         info = self.recv_data(7)
  55         if info == bytearray(b'\x00') or info == bytearray(b''):
  56             return False
  57         msg = unpack_pkt(info)
  58         #print("Connection already established")
  59         return True
  60
  61     def confirm_connection(self):
  62         for i in range(self.max_tries):
  63             try:
  64                 self.tx_ep.write(bytes([0x55]), self.timeout_ms)
  65                 ret = self.rx_ep.read(1, self.timeout_ms)
  66                 if ret[0] == 0xC3:
  67                     print("Reply received (0xC3)")
  68                     return True
  69             except usb.core.USBError as e:
  70                 print(f"Timeout: retry #{i}", e)
  71         return False
  72
  73     def authenticate_connection(self):
  74         raise Exception("Not implemented")
  75
  76     def set_chip_layout(self, cfg):
  77         if cfg == None:
  78             raise ValueError("Could net get chip layout")
  79         self.chip_layout = cfg
  80
  81     def send_data(self, packed_data):
  82         if (self.tx_ep == None):
  83             return False
  84         try:
  85             self.tx_ep.write(packed_data, self.timeout_ms)
  86         except usb.core.USBError as e:
  87             print(f"Timeout: error", e)
  88             return False
  89         return True
  90
  91     def recv_data(self, exp_len, timeout=100):
  92         msg = bytearray(b'')
  93         if (exp_len > MAX_TRANSFER_SIZE):
  94             raise ValueError(f"length package {exp_len} over max transfer size")
  95         if (self.rx_ep == None):
  96             return False
  97         try:
  98             received = 0
  99             while received != exp_len:
 100                 buf = self.rx_ep.read(exp_len, timeout)
 101                 msg += buf
 102                 received += len(buf)
 103                 if received == exp_len:
 104                     return msg
 105         except usb.core.USBError as e:
 106             print(f"Timeout: error", e)
 107         return msg