LOG_ (over RTT) and SHELL (over UART2)

Question

I am having issues separating the LOG_ and Shell on the nrf5340. (I am currently using the DevBoard)

I have created an overlay file to move the shell on UART2, which is connected via an FTDI adapter to my PC.

/ {

    chosen {
      zephyr,shell-uart = &uart2;
    };
  };
  
  &pinctrl {
    uart2_default: uart2_default {
        group1 {
            psels = <NRF_PSEL(UART_TX, 1, 11)>;
        };
        group2 {
            psels = <NRF_PSEL(UART_RX, 1, 12)>;
            bias-pull-up;
        };
    };
    uart2_sleep: uart2_sleep {
        group1 {
            psels = <NRF_PSEL(UART_TX, 1, 11)>,
                    <NRF_PSEL(UART_RX, 1, 12)>;
            low-power-enable;
        };
    };
};

&uart2 {
    compatible = "nordic,nrf-uarte";
    status = "okay";
    current-speed = <115200>;
    pinctrl-0 = <&uart2_default>;
	pinctrl-1 = <&uart2_sleep>;
	pinctrl-names = "default", "sleep";
  };

Modified the prj.conf

# RTT LOGGING
CONFIG_LOG=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_MODE_DEFERRED=y

Added the Shell

# SHELL
CONFIG_SHELL=y
CONFIG_SHELL_MINIMAL=y
CONFIG_SHELL_BACKEND_RTT=n

The result is as follows

so basically the LOGs are output in both backends. Any thoughts?

RadicalTomato · Accepted Answer

Replying to myself as I have spent some time looking for the issue. I was missing

##  Disables log output to all shell backends
CONFIG_SHELL_LOG_BACKEND=n

CONFIG_SHELL_LOG_BACKEND

Once that is added to the project configuration the LOG_ is just in the log console and the shell is being output via RTT.

main.c

#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>

LOG_MODULE_REGISTER(log_rtt, LOG_LEVEL_INF);

#define STACKSIZE 1024

#define LOG_THREAD_PRIORITY 7

void log_thread(void)
{
        uint16_t i = 0;

	while (1) {
		/* Display a simple string "Hello x" */
		LOG_INF("Hello %d\n", i++);
		/* Make the thread yield */
        k_yield();
		/* Put the thread to sleep */
		k_msleep(1000);
	}
}

K_THREAD_DEFINE(log_thread_id, STACKSIZE, log_thread, NULL, NULL, NULL,
		LOG_THREAD_PRIORITY, 0, 0);

prj.conf

# Logging
CONFIG_LOG=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_MODE_DEFERRED=y

# Realtime
CONFIG_POSIX_CLOCK=y

# RTT Shell subsys
CONFIG_SHELL=y
CONFIG_SHELL_MINIMAL=y
## We will not use USART
CONFIG_SHELL_BACKEND_SERIAL=y
##  Disables log output to all shell backends
CONFIG_SHELL_LOG_BACKEND=n
## We will not use USART
CONFIG_USE_SEGGER_RTT=y
CONFIG_SHELL_BACKEND_RTT=n

LOG_ (over RTT) and SHELL (over UART2)

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