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Table of Contents

Digital Read Pulse Width

Reads a digital pulse width on a a digital input channel.

LabVIEW

Developer Note

This VI takes an array of U8s. Each U8 represents a pin and data is returned in a U8/Boolean/ Array. The values returned are in the same order as the pin values. Do we scale in LV or on the uController? The ucontroller could return the number of bits per sample and the ref voltage.

Command Packet

  • Digital Read Pulse Width Command
  • Digital Read Pulse Width Response
    • Digital Read Pulse Width Command
    Description Reads a digital pulse width on a a digital input channel.
    Size 10 Bytes
    Format
    -
    0
    1
    2
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    N/A
    SoF : 0xFF
    PACKET SIZE : 0x0E
    PACKET NUM
    3
    4
    5
    6
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    PACKET NUM
    CMD : 0x0044
    RESP PIN NUM
    7
    8
    9
    10
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    STIM PIN NUM
    STIM
    PULSE POLARITY
    TIMEOUT
    11
    12
    13
    14
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    TIMEOUT
    CHECKSUM
    SoF Start of Frame. Always 0xFF.
    PACKET SIZE Packet Size In Bytes
    PACKET NUM The Current Packet Number. This value increments with each new packet.
    CMD Read Digital Pulse Width Command.
    RESP PIN NUM DI channel to read response.
    STIM PIN NUM DO channel to send stimulus.
    STIM Stimulus: 0x00 = No Stimulation, 0x01 = High, Low, High, 0x02 - Low, High, Low
    PULSE POLARITY Pulse Polarity : 0 = Active Low, 1 = Active High
    TIMEOUT U32 Timeout mS.
    CHECKSUM Checksum. Computed by adding all of the bytes in the packet in U8 form ignoring rollover.

    LINX Target

    Developer Note

    Loop over each pin byte. Read the value of the pin and pack data for response. Potentially return Aref and bits of resolution if LV is scaling.

    Response Packet

    Digital Read Pulse Width Response
    Description LINX device's response to Digital Read Pulse Width command
    Size 10 Bytes
    Format
    -
    -
    0
    1
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    N/A
    SoF : 0xFF
    PACKET SIZE : 0x0A
    2
    3
    4
    5
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    PACKET NUM
    STATUS
    VALUE
    6
    7
    8
    9
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    7
    6
    5
    4
    3
    2
    1
    0
    VALUE
    CHECKSUM
    SoF Start of Frame. Always 0xFF.
    PACKET SIZE Total packet size in bytes.
    PACKET NUM The packet number of the packet that generated the response.
    STATUS See Return Status section below.
    VALUE U32 Pulse width in uS
    CHECKSUM Checksum. Computed by adding all of the bytes in the packet in U8 form ignoring rollover.

    Return Status

    No function specific statuses. See return_status for universal return statuses.

    linx

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