Help needed with GPIO and 32kHz Crystal issues on custom nRF52832 board

RE: Help needed with GPIO and 32kHz Crystal issues on custom nRF52832 board

Priyanka — Fri, 04 Oct 2024 12:23:04 GMT

Hi,

You could maybe try to force the correct output mode with pull-down, try specifying the GPIO flags directly:

mux_en: mux_en {
gpios = <&gpio0 9 GPIO_OUTPUT_HIGH | GPIO_PULL_DOWN>;
label = "MUX_EN";
};

You could also try a minimal test case with only the GPIO configuration and toggling. If pin 9 is still unresponsive, then maybe you could try with another GPIO pin too.

-Priyanka

RE: Help needed with GPIO and 32kHz Crystal issues on custom nRF52832 board

Red J. — Thu, 03 Oct 2024 13:02:51 GMT

Hi Priyanka,

I'll test it on the SDK as soon as I can.

Meanwhile, I've been working on the GPIOs. I can change the pull-up/pull-down configurations on some pins while the main program is running and I detect the voltage changes.

Additionally, after using the gpio_pin_configure_dt() function, I can see the output register update during debugging, but there's no corresponding change in the pin voltage

As example, pin 9 is configurated ( and checked on the PINCNF[] register during debugging) as GPIO_OUTPUT_HIGH and GPIO_PULL_DOWN

This pin appears in the builded file zephyr.dts as:

	aliases {
		muxen = &mux_en;
	};
	
	leds {
		mux_en: mux_en {
			gpios = < &gpio0 0x9 0x0 >;
			label = "MUX_EN";
		};

I would appreciate any recommendation meanwhile I proceed to try on another DK boards.

Thank you for your attention!

RE: Help needed with GPIO and 32kHz Crystal issues on custom nRF52832 board

Priyanka — Thu, 03 Oct 2024 09:26:20 GMT

Hi,

It does looks like you have tried troubleshooting well. You mentioned that the GPIOs also have problem. Please make sure that you have properly initialized them in your code. As for the external crystal issue, please make sure that you have the .dts file written correctly. Same for the GPIO pins.

Have you tried maybe to run you code on any DK, just to make sure that the issue is not isolated to your custom hardware?

Regards,

Priyanka