Lab 20. Detecting GPIO state

Owned by Mališa Vučinić
Last updated: Oct 31, 2023 by Thomas Watteyne
1 min read

Project 01bsp_gpio_in is a standalone project for the AIOT Play board. We will detect the state of a GPIO pin by configuring it as an input.

 

Make 01bsp_gpio_in the active project

In the source code, activate the 01bsp_gpio_in project.

Examine the source code

Open the 01bsp_gpio_in.c file.

Which pin is configured as INPUT in the code?

Connection

  1. Connect the nRF52840-DK to the AIOT Play

  2. Put batteries in the AIOT Play

  3. Plug in the nRF52840-DK

  4. Switch the nRF52840-DK on

  5. In Segger, select “Build and Debug” which will compile the project and load the resulting binary on the AIOT Play

  6. Set a breakpoint in the code by clicking on a source code line number

  7. Take a jumper cable and connect the pin you identified with GND

  8. Now, connect the jumper to 3.6 V

Where did you set the breakpoint to see the changes on the GPIO?