NXC  Version 1.2.1 r5
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byte SensorUS0 ( const byte  port)

Read ultrasonic sensor value without wait.

Return the ultrasonic sensor distance value. Since an ultrasonic sensor is an I2C digital sensor its value cannot be read using the standard Sensor(n) value. The port must be configured as a Lowspeed port before using this function. Since this function does not include a built-in 15 millisecond wait it will be necessary to write your code so that repeated calls do not occur more frequently than once every 15 milliseconds.

portThe port to which the ultrasonic sensor is attached. See the Input port constants group. You may use a constant or a variable.
The ultrasonic sensor distance value (0..255)