Skip to content
Flojoy Docs

I2C_TRIGGER_MSO2X

Download Flojoy Studio to try this app
Set the MSO2XX I2C trigger settings. Requires a CONNECT_MSO2X block to create the connection. Tested on MSO22 and MSO24. Params: connection : VisaConnection The VISA address (requires the CONNECTION_MSO2X block). bus_num : int, default=1 Bus number to use as the trigger. condition : select, default=start What to trigger on addr_bits : select, default=10 The number of bits in the address to trigger on addr : str, default=0101010010 The address to trigger on (binary only currently). Can use X (0 or 1). Putting a lower number of bits: e.g. "1011" sets the address XXX1011. data_direction : select, default=read Trigger on read, write, or either data direction. data_size : int, default=1 The data size, in bytes, to trigger on. data_value : str, default=11001101 The data to trigger on (binary only currently). Can use X for wildcard (e.g. XXXXXXXX). Returns: out : String Trigger settings
Python Code
from typing import Optional, Literal
from flojoy import VisaConnection, flojoy, DataContainer, String


@flojoy(inject_connection=True)
def I2C_TRIGGER_MSO2X(
    connection: VisaConnection,
    input: Optional[DataContainer] = None,
    bus_num: int = 1,
    condition: Literal[
        "start",
        "stop",
        "repeatstart",
        "ackmiss",
        "address",
        "data",
        "addranddata",
    ] = "start",
    addr_bits: Literal["7", "10"] = "10",
    addr: str = "0101010010",
    data_direction: Literal["read", "write", "nocare"] = "read",
    data_size: int = 1,
    data_value: str = "1100101",
) -> String:
    """Set the MSO2XX I2C trigger settings.

    Requires a CONNECT_MSO2X block to create the connection.

    Tested on MSO22 and MSO24.

    Parameters
    ----------
    connection : VisaConnection
        The VISA address (requires the CONNECTION_MSO2X block).
    bus_num : int, default=1
        Bus number to use as the trigger.
    condition : select, default=start
        What to trigger on
    addr_bits : select, default=10
        The number of bits in the address to trigger on
    addr : str, default=0101010010
        The address to trigger on (binary only currently). Can use X (0 or 1).
        Putting a lower number of bits: e.g. "1011" sets the address XXX1011.
    data_direction : select, default=read
        Trigger on read, write, or either data direction.
    data_size : int, default=1
        The data size, in bytes, to trigger on.
    data_value : str, default=11001101
        The data to trigger on (binary only currently).
        Can use X for wildcard (e.g. XXXXXXXX).

    Returns
    -------
    String
        Trigger settings
    """

    # Retrieve oscilloscope instrument connection
    scope = connection.get_handle()

    allowed = set("01Xx")

    assert set(addr) <= allowed, "addr must contain only 0, 1, or X"
    assert set(data_value) <= allowed, "addr must contain only 0, 1, or X"

    scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:CONDition {condition}")

    match condition:
        case "address":
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:ADDRess:MODe ADDR{addr_bits}")
            scope.write(f'TRIGger:A:BUS:B{bus_num}:I2C:ADDRess:VALue "{addr}"')
        case "data":
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:DIRection {data_direction}")
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:SIZe {data_size}")
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:VALue {data_value}")
        case "addranddata":
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:ADDRess:MODe ADDR{addr_bits}")
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:ADDRess:VALue {addr}")
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:DIRection {data_direction}")
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:SIZe {data_size}")
            scope.write(f"TRIGger:A:BUS:B{bus_num}:I2C:VALue {data_value}")

    return String(s="Trigger settings")

Find this Flojoy Block on GitHub

Example App

Having problems with this example app? Join our Discord community and we will help you out!
React Flow mini map

This app uses the Tektronix tm_measure library to decode I2C using a Tektronix MSO24 oscilloscope.

First the necessary blocks were added:

  • 1 CONNECT_MSO2X
  • 1 I2C_TRIGGER_MSO2X
  • 1 SINGLE_TRIGGER_MSO2X
  • 1 DECODE_I2C_MSO2X
  • 1 TEXT_VIEW

Each of these blocks must change the connection parameter to the correct instrument. The parameters were changed to match the setup: the clock_channel and data_channel parameters were changed to the proper analog or digital channel. The I2C_TRIGGER_MSO2X parameters were changed to trigger on the corrent signal. For example:

  • condition = address
  • addr_bits = 7
  • addr = 0010

therefore the actual address will be XXX0010 where X corresponds to a wildcard (0 or 1).

The blocks were connected as shown and the app was run.