Issue with MCP9808 library and SoftI2C

[JeremyLaurenson]

Hey folks,

Im trying to get an MCP9808 I2C sensor going using the code from https://github.com/kfricke/micropython-mcp9808

I needed to fix an issue first where it would accept SoftI2C as well as I2C arguments, but my next issue us the following:

TypeError: object with buffer protocol required
in the Send function:

def _send(self, buf):
        """
        Sends the given bufer object over I2C to the sensor.
        """
        if hasattr(self._i2c, "writeto"):
            # Micropython
            self._i2c.writeto(self._addr, buf)
        elif hasattr(self._i2c, "send"):
            # PyBoard Micropython
            self._i2c.send(self._addr, buf)
        else:
            raise Exception("Invalid I2C object. Unknown Micropython/platform?")

Should I be fixing this and submitting back tot he repo, or is there a different place I should be getting the code from?

[mcauser]

To work around this, try wrapping the buf in a byte array bytearray(buf)

[peterhinch]

Yes, something like

def _send(self, buf, ba=bytearray(1)):
        """
        Sends the given buffer object over I2C to the sensor.
        """
        if isinstance(buf, int):
            ba[0] = buf
            buf = ba
        if hasattr(self._i2c, "writeto"):
            # Micropython
            self._i2c.writeto(self._addr, buf)
        elif hasattr(self._i2c, "send"):
            # PyBoard Micropython
            self._i2c.send(self._addr, buf)
        else:
            raise Exception("Invalid I2C object. Unknown Micropython/platform?")

What puzzles me is how the original code ever managed to work.

[mcauser]

MicroPython has changed a lot in the last 4 years