Variable pwmConst

Type Declaration

• counts: function

  • counts(bytes: Uint8Array): { off: number; on: number }

    Reads a setting back from the four register bytes a channel holds.

    The inverse of the builders above, so a caller can read a channel off the bus and see what it is set to rather than decoding the registers by hand.

    Parameters

    • bytes: Uint8Array

      The four channel registers.

    Returns { off: number; on: number }

    The counts at which the output goes high and low.

    Throws

    If the buffer is not four bytes.

• duty: function

  • duty(off: number): Buffer

    Builds a setting with no phase delay: on at count 0, off at off.

    Parameters

    • off: number

      The count at which the output goes low, which sets the duty.

    Returns Buffer

    The four register bytes.

• fromCounts: function

  • fromCounts(on: number, off: number): Buffer

    Builds a setting from explicit on and off counts.

    Parameters

    • on: number

      The count at which the output goes high.

    • off: number

      The count at which it goes low.

    Returns Buffer

    The four register bytes; counts are masked to 12 bits.

• fullOff: function

  • fullOff(): Buffer

    The setting that holds a channel continuously low, the power-on state.

    Returns Buffer

    The four register bytes. This is not the same as a zero duty, which still glitches high for one count.

• fullOn: function

  • fullOn(): Buffer

    Returns Buffer

• servo: function

  • servo(pulseMicros: number, updateRateHz?: number): Buffer

    Builds the setting that drives a hobby servo to a pulse width.

    Parameters

    • pulseMicros: number

      The high-pulse width in microseconds. Typical travel is about 1000 to 2000 microseconds.

    • updateRateHz: number = 50

      The PWM frequency the controller is set to, usually 50.

    Returns Buffer

    The four register bytes.