nrf52832-dk - uart - p.21 reset

[Simon]

Hello,
checking if it's at all possible to have uart working on the nrf52832-dk using pins 18 and 21.
I can get rx/tx working with an ftdi using pin 12 & 13, but not 18 & 21.

This is the overlay I'm using for the dk with /delete-property/gpio-as-nreset; and a simple blinky example.
vs ncs sdk v290

/*
 * Copyright (c) 2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

 / {
	chosen {
		ncs,slm-uart = &uart0;
		ncs,slm-gpio = &gpio0;
	};
};

&uart0 {
	compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	status = "okay";

	pinctrl-0 = <&uart0_default>;
	pinctrl-1 = <&uart0_sleep>;
	pinctrl-names = "default", "sleep";
};

&pinctrl {
	uart0_default: uart0_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 21)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 0, 18)>;
			bias-pull-up;
		};
	};

	uart0_sleep: uart0_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 21)>,
				    <NRF_PSEL(UART_RX, 0, 18)>;
			low-power-enable;
		};
	};
};

&uicr {
    /delete-property/gpio-as-nreset;
};

thank-you,

[johnathanpalm]

Hello,

Your pin configuration looks mostly correct. However, confirm that the pin numbers are set up properly in your overlays:

dts
group1 {
psels = <NRF_PSEL(UART_TX, 0, 21)>;
};
group2 {
psels = <NRF_PSEL(UART_RX, 0, 18)>;
bias-pull-up; // Ensure this is correct for your setup
};

[Simon]

nope,
tried every side of the chip,
pins 3/4, 12/13, 29/30, 23/24 all good,
except 18/21.
maybe something else to try?

thank-you,