Functions

The following functions are available globally.

  • When you invoke the wait function, the CPU keeps on working and checking if the time set (in microsecond）is up. In addition, this function is more accurate than the sleep function.

    Declaration

    Swift

    @inline(__always)
public func wait(us: Int)

  • The sleep function will suspend the processor’s work in a given time period (in millisecond).

    Declaration

    Swift

    @inline(__always)
public func sleep(ms: Int)

  • Get the elapsed time in millisecond since the board powered up.

    Declaration

    Swift

    @inline(__always)
public func getPowerUpMilliseconds() -> Int64

    Return Value

    The elapsed time since power up in millisecond.

  • Get the current clock cycle of the low level 32bit timer.

    Attention

    This value is got from a 32bit register driven by the CPU frequency, it would overflow every a few seconds. This function is only used to measure very short time duration with cyclesToNanoseconds(start: UInt, stop: UInt).

    Declaration

    Swift

    @inline(__always)
public func getClockCycle() -> UInt

    Return Value

    The current clock cycle in UInt.

  • Convert the clock cycle into nanoseconds. This function is usually used together with getClockCycle().

    Declaration

    Swift

    public func cyclesToNanoseconds(start: UInt, stop: UInt) -> Int64

    Parameters

    start

    The start cycle get by getClockCycle().
    stop

    The stop cycle get by getClockCycle().

    Return Value

    The duration in nanoseconds.