i2cReset()
i2cRead(addr, num_bytes)
i2cWrite(addr, [data])
i2cWriteRead(addr, [data], num_bytes)

These helper functions implement th high-level interface to the external I2C bus available through the SDA (GPIO27)) and SCL (GPIO32)).

The i2cReset resets the I2C bus by sending a STOP signal.

The i2cRead reads up to num_bytes bytes from the device with the given address. Returns an array with the read bytes.

The i2cWrite writes the given byte array to the device with the given address.

The i2cWriteRead first writes the given byte array to the device, then re-starts the communication in read mode and reads up to num_bytes from the device. Returns an array with the read bytes.