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.
| 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.