eeRead() - OSError: exception: access violation reading 0x....

[felixp98]

Describe the bug While reading the EEPROM of a FT232RQ through eeRead() an exception occurrs on some chips.

Traceback:

File "update_eeprom_config.py", line 34, in update_eeprom eeprom_data = device.eeRead()
File ".venv\\lib\\site-packages\\ftd2xx\\ftd2xx.py", line 609, in eeRead call_ft(\_ft.FT_EE_Read, self.handle, c.byref(progdata))
File ".venv\\lib\\site-packages\\ftd2xx\\ftd2xx.py", line 176, in call_ft status = function(\*args)
OSError: exception: access violation reading 0x0000028690BF93A5

To Reproduce Before calling eeRead() the following commands are called:

• ftd2xx.listDevices()
• ftd2xx.open()
• getDeviceInfo()

Expected behavior return EEPROM data without exception

Desktop:

• OS: Windows
• OS Version: Windows 10
• Python Version: 3.10.2
• FTDI driver version: ftd2xx 1.3.8

Additional context

• the reported address is different each time
• about 50% of the FT232RQ chips we have, fail with this exception type, even when retrying a hundred times
• however, the affected chips are read and writable with FTDI FT_Prog Utility Tool
• once programmed with the FT_Prog tool, it is readable again through ftd2xx eeRead()

Any idea?