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,

 

UART1 is by default on P0.00 and P0.01, and is connected to the SEGGER IC on the DK.

Can you please try to use another GPIO pair (like P0.10 and P0.11) and see if those work better?

 

Kind regards,

Håkon

[Parth Sagar]

Thanks for the suggestion, but it dsnt work.

Do you think I need to add  CONFIG_UART_1_NRF_UARTE=y in my cfg file?

If yes, then I am getting errors

[Håkon Alseth]

Hi,

 

Parth Sagar said:

Do you think I need to add  CONFIG_UART_1_NRF_UARTE=y in my cfg file?

No need in ncs v1.3.0, as the dts has this peripheral enabled in the .overlay file.

 

Could you click where it says "tasks" in the SES text box, and select "output" and show what that states?

It might be that you need to delete your build folder, and regenerate the project. If that still shows errors, please post them to me.

 

Kind regards,

Håkon

[Parth Sagar]

So this occurs when I add CONFIG_UART_1_NRF_UARTE=y in my config file

If its not needed to add (as you told earlier), then it wouldnt give any error.

[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