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import os
import binascii
def _generate_data_bytes(boarduuid, mac0, mac1):
data = bytearray()
data += (2029785358).to_bytes(4, 'big') # magicid --> 0x78FC110E
data += bytearray([0, 0, 0, 0]) # crc32 = 0
data += bytearray(boarduuid + "\0",
'ascii') # uuid --> 'c0846c8a-5fa5-11ea-8576-f8b156ac62d7' and \0 at the end
data += binascii.unhexlify(mac0.replace(':', '')) # mac0 --> 'f8:b1:56:ac:62:d7'
if mac1 is not None:
data += binascii.unhexlify(mac1.replace(':', '')) # mac1 --> 'f8:b1:56:ac:62:d7'
else:
data += bytearray([0, 0, 0, 0, 0, 0]) # mac1 --> 0:0:0:0:0:0
# calculate crc
crc = (binascii.crc32(data, 0)).to_bytes(4, 'big')
data[4:8] = crc
return data
def _generate_output_data(data_rx):
boarduuid = data_rx[8:45].decode
mac0 = binascii.hexlify(data_rx[45:53]).decode()
mac1 = binascii.hexlify(data_rx[53:61]).decode()
smac0 = '-'.join(mac0[i:i + 2] for i in range(0, len(mac0), 2))
smac1 = '-'.join(mac1[i:i + 2] for i in range(0, len(mac1), 2))
eepromdata = "UUID :" + boarduuid + " MAC0:" + smac0 + " MAC1:" + smac1
return eepromdata
# returns exitcode and data saved into eeprom
def flash_eeprom(eeprompath, boarduuid, mac0, mac1=None):
print("Start programming Eeprom...")
# check if eeprompath is correct
if os.path.isfile(eeprompath):
# create u-boot data struct
data = _generate_data_bytes(boarduuid, mac0, mac1)
# write into eeprom and read back
f = open(eeprompath, "r+b")
f.write(data)
f.seek(0)
data_rx = f.read(57)
for i in range(57):
if data_rx[i] != data[i]:
print("Error while programming eeprom memory.")
return 1, None
print("Eeprom programmed succesfully.")
# generated eeprom read data
eepromdata = _generate_output_data(data_rx)
return 0, eepromdata
else:
print("Eeprom memory not found.")
return 1, None
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