I2C bus defining in busio.py (Raspberry pi 4)

Hi,

I'd need the option of specifying my I2C bus on raspberry pi 4, as I need to use a different one for my IMU. Now I could use specific bus like 3 or 4, with minimal code changes.

below init changes would be needed in src/busio.py

Intention is to only have effect when "bus_id" is defined.

def __init__(self, scl, sda, frequency=400000, bus_id=None):
    self.init(scl, sda, frequency, bus_id)

def init(self, scl, sda, frequency, bus_id):
    self.deinit()
    if detector.board.ftdi_ft232h:
        from adafruit_blinka.microcontroller.ft232h.i2c import I2C
        self._i2c = I2C(frequency=frequency)
        return
    elif detector.board.binho_nova:
        from adafruit_blinka.microcontroller.nova.i2c import I2C
    elif detector.board.microchip_mcp2221:
        from adafruit_blinka.microcontroller.mcp2221.i2c import I2C
        self._i2c = I2C(frequency=frequency)
        return
    elif detector.board.any_embedded_linux:
        from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C
    else:
        from machine import I2C as _I2C
    from microcontroller.pin import i2cPorts
    for portId, portScl, portSda in i2cPorts:
        try:
            if scl == portScl and sda == portSda:
                if bus_id is not None:
                    portId = bus_id
                self._i2c = _I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
                break
        except RuntimeError:
            pass
    else:
        raise ValueError(
            "No Hardware I2C on (scl,sda)={}\nValid I2C ports: {}".format((scl, sda), i2cPorts)
        )

    self._lock = threading.RLock()

adafruit / Adafruit_Blinka

I2C bus defining in busio.py (Raspberry pi 4) #209