Example of GPIO test in output mode

In the following example, a GPIO test is done in the output mode with Serial Wire Debug (SWD) controls.

1. Write the GPIO pins connected with drive strength H0H1:
   • Address: 0x50842700 (+ n x 0x4 for GPIO0-31)
   • Data: 0x300
2. Set the GPIO pins to the output mode:
   • Address: 0x50842514
   • Data: 0xFFFFFFFF
3. Write the GPIO pins to the wanted state.

   For example:

   • Set even pins low and odd pins high:
     • Address: 0x50842504
     • Data: 0xAAAAAAAA
   • Set odd pins low and even pins high:
     • Address: 0x50842504
     • Data 0x55555555
4. Measure the voltage in the GPIO pins, for example, with an oscilloscope.
   Use a suitable load current, for example, 1 mA to verify the quality of the contact.