It can be a message like a command or data like sensor readings, for example. MQTT - Topics. 13Z017-06 MDIS5 low-level driver sources (MEN) for 16Z034_GPIO, 16Z037_GPIO and 16Z127_GPIO 13Z025-60 VxWorks. Input project name design_example_1. Deselect Include run results. Click OK. In the Flow Navigator, under IP integrator, click Open Block Design and select edt_zcu102.bd. Adding the AXI Timer and AXI GPIO IP Adding the AXI. LPC2148 GPIO Tutorial PINSEL Register. A 32-bit register is used to select the function of the pins in which the user needs it to operate. As I said there are four functions for each pin of the controller, and the first function was GPIO ( General Purpose Input Output ). It means that the pin can either act as an Input or Output with no specific functions.