python3 and fousb.py

[Hartmut Schweidler]

Hallo

I  have 2to3 by foub.py  and changed the code in

fousb.py in line 1174  for Python 3.7.3

    def _read_usb_block(self, address):
        addr1 = (address // 256) & 0xff
        addr2 = address & 0xff
        self.devh.controlMsg(usb.TYPE_CLASS + usb.RECIP_INTERFACE,
                             0x0000009,
                             [0xA1,addr1,addr2,0x20,0xA1,addr1,addr2,0x20],
                             0x0000200,
                             0x0000000,
                             1000)
        data = self.devh.interruptRead(self.usb_endpoint,
                                       self.usb_read_size, # bytes to read
                                       int(self.timeout*1000))
        return list(data)

and in line 1198

    def _write_usb(self, address, data):
        addr1 = (address // 256) & 0xff
        addr2 = address & 0xff
        buf = [0xA2,addr1,addr2,0x20,0xA2,data,0,0x20]
        result = self.devh.controlMsg(
            usb.ENDPOINT_OUT + usb.TYPE_CLASS + usb.RECIP_INTERFACE,
            usb.REQ_SET_CONFIGURATION,  # 0x09
            buf,
            value = 0x200,
            index = 0,
            timeout = int(self.timeout*1000))
        if result != len(buf):
            return False
        buf = self._read_usb_bytes(8)
        if buf is None:
            return False
        for byte in buf:
            if byte != 0xA5:
                return False
        return True

otherwise the operator "/" will be interpreted incorrectly, it must be right  "//"

and it works

Hartmut

[Susan Mackay]

Out of interest, what problem does this solve?

What are the symptoms you experienced that made you look for this?

Susan

[Hartmut Schweidler]

Hi Susan,

the https://github.com/hes19073/hesweewx/blob/master/bin/weewx/drivers/fousb.py works now error-free under python3.7.3

Hartmut

[Susan Mackay]

I take it from that, that the software was crashing and stopping weewx when run with that version of Python, where it would run correctly and produce the correct results under all previous versions.\

Thanks for finding this out.

Susan