code flashed in nrf52840 dk board but not executing its task for any code

Question

i am using vs code for programing and flashing the code. 
 I have previously run all led blinking code, printing code in serial monitor given by nordic academy then board inbuilt led`s were blinking and successfully printing on com port as per code written. the last code i performed in nrf52840 dk board successfully was uart communication code ( https://github.com/NordicDeveloperAcademy/ncs-fund/blob/main/v2.x.x/lesson5/fund_less5_exer1_solution/src/main.c ) for that the physical connection was:- 
 nrf52840 dk USB_to_serial 
 po.06 RX 
 po.08 TX 
 Po.00 GND 
 As nrf52840 dk has two uart interface uart0 and uart1 that`s why i just wanted to check that uart1 is also working or not so to do that i just replaced uart1 in place of uart0. for referance i have attached below image also. 
 
 and flashed the program in board but led`s were not blinking on sending 0,1,2,3from uart interface (USB_to_serial interface). 
 [ here i have done one wrong thing that i didn`t change the physical pin connection for uart1] 
 to confirm that is there any thing wrong with that code , i ran the simple led blinking code ( which was from nordic academy ) but nothing was happening . 
 so i uploaded other sample code but in response nothing was happening. 
 so the problem is that code is uploading successfully but not executing . i don`t why this happening , is it stuck in any mode. 
 
 ( link for code which i used all of them were fro here https://github.com/NordicDeveloperAcademy/ncs-fund/tree/main/v2.x.x ).

Amanda Hsieh · Answer

Hi,

You need nRF52840dk_nrf52840.overlay to overwrite the device tree to use uart1:

/*
 * Copyright (c) 2021-2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

&uart1 {
	status = "okay";
	pinctrl-0 = <&uart1_default_alt>;
	pinctrl-1 = <&uart1_sleep_alt>;
	pinctrl-names = "default", "sleep";
};

&uart0 {
	pinctrl-0 = <&uart0_default_alt>;
	pinctrl-1 = <&uart0_sleep_alt>;
	pinctrl-names = "default", "sleep";
};

&zephyr_udc0 {
	cdc_acm_uart0: cdc_acm_uart0 {
		compatible = "zephyr,cdc-acm-uart";
	};
};

&pinctrl {
	uart1_default_alt: uart1_default_alt {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 6)>,
				<NRF_PSEL(UART_RX, 0, 8)>,
				<NRF_PSEL(UART_RTS, 0, 5)>,
				<NRF_PSEL(UART_CTS, 0, 7)>;
		};
	};

	uart1_sleep_alt: uart1_sleep_alt {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 6)>,
				<NRF_PSEL(UART_RX, 0, 8)>,
				<NRF_PSEL(UART_RTS, 0, 5)>,
				<NRF_PSEL(UART_CTS, 0, 7)>;
			low-power-enable;
		};
	};

	uart0_default_alt: uart0_default_alt {
		group1 {
			psels = <NRF_PSEL(UART_RX, 1, 1)>,
				<NRF_PSEL(UART_TX, 1, 2)>;
		};
	};

	uart0_sleep_alt: uart0_sleep_alt {
		group1 {
			psels = <NRF_PSEL(UART_RX, 1, 1)>,
				<NRF_PSEL(UART_TX, 1, 2)>;
			low-power-enable;
		};
	};

};

/ {
	chosen {
		ncs,zigbee-uart = &uart1;
	};
};

Here is my test project fund_less5_exer1_solution_uart1.7z for NCS v2.3.0.

Beware that this code/configuration is not fully tested or qualified and should be considered provided “as-is”. Please test it with your application and let me know if you find any issues.

-Amanda H.

code flashed in nrf52840 dk board but not executing its task for any code

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