Breakout Board Digital Inputs

The following excerpt from the Breakout Board example workflow demonstrates digital inputs functionality by responding to button presses and saves digital inputs data.

The DigitalInput operator generates a sequence of DigitalInputDataFrames. Although the digital inputs are sampled at 4 Mhz, these data frames are only emitted when the port status changes (i.e., when a pin, button, or switch is toggled). The digital input ports on the Breakout Board operate at a 3.3V logic levels but are also 5V tolerant. In the Breakout Board example workflow, the DigitalInput's DeviceName property is set to "BreakoutBoard/DigitalInput". This links the DigitalInput operator to the corresponding configuration operator.

The CsvWriter operator writes the Clock, DigitalInputs, and Buttons members from the DigitalInputDataFrame to a file with the following name format: digital-input_<filecount>.csv. Because CsvWriter is a sink operator, its output sequence is equivalent to its input sequence. In other words, its output is equivalent to DigitalInput's output. Therefore, it's possible to use MemberSelector operators on the CsvWriter to select members from DigitalInputDataFrame. This is most easily performed by clicking the relevant members that appear by hovering over the "Output" option that appears in the context menu that appears after right-clicking the CsvWriter node. The members selected in the workflow, DigitalPortState and BreakoutButtonState, are enumerators with values that correspond to bit positions of the breakout board's digital ports. When DigitalPortState or OpenEphys.Onix1.BreakoutButtonState is connected to a HasFlags operator, the names that appear in the HasFlags's Value property's dropdown menu correspond to bit positions in the respective digital input port. In this workflow, the top HasFlags operator checks if Triangle or X are True.