GPIO Interface

The GPIO interface contains the bit values of the enabled Debug GPIO pins. A packet of unsigned 8-bit data is transmitted every time a pin toggles.

On the Data Sources (left) pane, when the GPIO interface is selected, the GPIO settings are displayed on the lower section.

Table 1. Configuration
Field Name	Values	Usage
GPIO 0 Change Triggers Bus Read	ON, OFF	Monitor change on GPIO pin 0 to trigger a bus read
GPIO 1 Change Triggers Bus Read	ON, OFF	Monitor change on GPIO pin 1 to trigger a bus read
GPIO 2 Change Triggers Bus Read	ON, OFF	Monitor change on GPIO pin 2 to trigger a bus read
GPIO 3 Change Triggers Bus Read	ON, OFF	Monitor change on GPIO pin 3 to trigger a bus read

Important: When plotting the Debug GPIO data source, all GPIOs are sampled but only those GPIOs that have change triggers enabled will trigger a sample on change. For example, if GPIO n (n = 0,1,2) all have “GPIO n Change Triggers Bus Read” disabled, but GPIO 3 has this function enabled, then GPIO values will only be sampled when GPIO 3 changes; that is, all four GPIO values will be read only when GPIO 3 changes.