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This PR adds two new read-only flags to the TWI module that allow to sense the current bus state:
TWI_CTRL_SENSE_SCL
(read-only) - current state of the SCL bus lineTWI_CTRL_SENSE_SDA
(read-only) - current state of the SDA bus lineThis feature can be used to check if the external wiring is fine (no short circuit, no missing pull-ups) or if there are any faulty devices (blocking the bus).