Want to use UART 1 with nRF9160 DK to print output on the console from another MCU

[Parth Sagar]

I am unable to read any uart input when I configure UART1 with nRF9160DK.

Please let me know if anything is wrong in my code/config

main.c

/*

* 

*

* SPDX-License-Identifier: Apache-2.0

*/

#include <zephyr.h>
//#include <misc/printk.h>
//#include <logging/log.h>
#include <drivers/uart.h>

static u8_t uart_buf[1024];

void uart_cb(struct device *x)
{
	uart_irq_update(x);
	int data_length = 0;

	if (uart_irq_rx_ready(x)) 
        {
		
                data_length = uart_fifo_read(x, uart_buf, sizeof(uart_buf));
		uart_buf[data_length] = 0;
	}
	printk("%s", uart_buf);
}

void main(void)
{
	struct device *uart1 = device_get_binding("UART_1");

	uart_irq_callback_set(uart1, uart_cb);
	uart_irq_rx_enable(uart1);
	printk("UART1 loopback start!\n");
	while (1) {
		k_cpu_idle();
	}
}

nrf9160dk_nrf9160ns.overlay

/ {
	chosen {
		zephyr,bt-uart=&uart1;
	};
};
&uart1 {
compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	status = "okay";
	tx-pin = <00>;
	rx-pin = <01>;
	rts-pin = <0xFFFFFFFF>;
	cts-pin = <0xFFFFFFFF>;
};

prj.conf

CONFIG_SERIAL=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_BSD_LIBRARY_TRACE_ENABLED=n
CONFIG_MAIN_STACK_SIZE=4096

I cannot see any data on my console even after sending data continuously to the console. Please guide me through the problem. I am also attaching the folder.

I add the folder in : D:\Softwares\SDK\v1.3.0\nrf\samples\nrf9160\uart

[Håkon Alseth]

Hi,

 

Did you try to use P0.10 and P0.11 as RXD/TXD on UART1?

As mentioned, P0.01 and P0.00 are physically connected to another IC on the DK, so you cannot use those pins if you want to connect your own UART device. Do note that not all GPIOs are available to use freely on the nRF9160-DK, but P0.10 to P0.13 are available on the pin header. Here you can see the default configuration, and which pins are already in-use on the DK:

https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/board_controller.html?cp=2_0_5_4_6_0

  

Kind regards,

Håkon

[Parth Sagar]

Hi Hakon,

Thank you very much for your recommendations. I followed your instructions on another board and it works. Still not sure what was wrong with my previous board. Do you have any suggestions to factory reset nRF9160DK?

[Håkon Alseth]

Hi,

 

I'm glad to hear it worked.

 

Parth Sagar said:

Do you have any suggestions to factory reset nRF9160DK?

 You can erase the application, by calling "nrfjprog -e -f nrf91". This will then leave the nRF9160 application flash blank. Note: this does not do anything with the modem itself, it only erases the application.

 

Kind regards

Håkon