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,

[Simonr]

Hi

That should be possible. Check the nRF52832 DK, as there are some solder bridges related to the P0.21 you can try to cut. I don't see a reason P0.18 shouldn't be working though. Have you tried using P0.18 alongside any other pin than P0.21?

Best regards,

Simon

[Simon]

tried 18/19 on the dk52, ok, then 18/21 and then that turned ok, which this all started from the custom connector having rx/tx mislabeled,...thank-you.