Example of GPIO test in input mode

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

1. Write the GPIO pins connected with drive strength H0H1:
   • For each pin, write 0x300 to the PIN_CFN register.
2. Set the GPIO pins to input mode:
   • Write 0x0 to the DIR register to set all pins as input.
3. Set the GPIO pins to the wanted state from a production tester.
4. Read the GPIO status from the IN register.
5. Compare the read value to the tester setting.