GPIO Pin configuration issue

[DEEPU JOY]

Hi,  

We are using nRF52832 custom board for our application. 

In this board we have to use P0.05 pin as GPIO Input. But it is continuously showing LOW signal in multimeter also. 

When we remove the power of nRF IC the pin show HIGH. That means the IC making the line to LOW signal.

[Kenneth]

Hello,

I would likely have started to look at the pin configuration in the devicetree, to see if the pin in question might be used used by some peripheral, for instance maybe it's configured as part of the UART interface (e.g. if hardware flow control is enabled).

Kenneth

[DEEPU JOY]

we are using dev kit device tree and overlay for our custom board. On our custom board, we are not using uart. The gpio pin p0.05 configured on overlay as follows:
buttons{ compatible = "gpio-keys";
button_0: button_0{
gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>;
label = "CHARGER";
status = "okay";
};
}
We also tried to configure this pin as adc input pin; but it is also showed the same behavior.

[Kenneth]

In your build folder there should be an zephyr.dts file, can you send me this? Do you by any chance have a bootloder or similar that may control this pin?

Kenneth

[DEEPU JOY]

Hi , 

zephyr (1).dts

[DEEPU JOY]

Please check the file attached in the previous reply. 

[Kenneth]

Hi

I can see uart0 is status="okay" and use uart0_default where:

psels = < 0x6 >, < 0x1000008 >, < 0x2000005 >, < 0x3000007 >;

In this case 0x2000005 I believe means P0.5 is output, likely hardware flow control for uart0.

Kenneth