5.2.1.5 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 5-6. Configuration
Field NameValuesUsage
GPIO 0 Change Triggers Bus ReadON, OFFMonitor change on GPIO pin 0 to trigger a bus read
GPIO 1 Change Triggers Bus ReadON, OFFMonitor change on GPIO pin 1 to trigger a bus read
GPIO 2 Change Triggers Bus ReadON, OFFMonitor change on GPIO pin 2 to trigger a bus read
GPIO 3 Change Triggers Bus ReadON, OFFMonitor 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.