QFAA-Pin mapping

[janik]

Hello,
I have created a custom board with the nrf52840 QFAA and have already flashed it successfully. I do the flashing and debugging with the nrf52840dk. Now I have written code to toggle a pin. It works on the DK. On my custom board I see in debug mode that the pin is toggled. However, I cannot measure the toggling.

The assumption is that I am toggling the wrong pin. In the description of the VSCode extension, the naming of the pins is different than in the user manual.

Of course, it could also be that I have not configured the GPIOs correctly as peripherals. I enabeled both GPIO controllers via the VisualEditor and then added the corresponding pins via the node function.

[Vidar Berg]

Hello,

To try to rule out any issues with the FW configuration, please try programming the attached hex file and see if that works.

Hex file

4682.zephyr.hex

$ nrfjprog --program zephyr.hex --chiperase --verify -r

Project

pin_test.zip

Best regards,

Vidar

[janik]

I flashed the test software, but the GPIO doesn't work.

When measuring the pins, I noticed that there were 3 volts on the decoupling pins. I used the reference design from the data sheet as circuit design.

[Vidar Berg]

Which decoupling pins, on DEC4? Also, are you able to debug the application to confirm that the program reaches main()?

[janik]

All decoupling pins have 3 volts. I can debug the program. It even goes to the main loop.
When debugging, you can see that the pins are toggled in the register.

I also flashed a Bluetooth example application onto the microcontroller and it worked. Only the GPIOs don't work.

[Vidar Berg]

This sounds like a hardware problem. The voltage on DEC4 should also be ~1.3V. Could you please create a new private ticket and upload your schematics along with the Gerber files for review?