NRF Printk

RE: NRF Printk

Priyanka — Wed, 22 Oct 2025 11:20:48 GMT

Hi,

Sorry for the late response.

But I think maybe the issue was with your overlay configuration.

The initial ay you tried was correct, but could you add the following to your overlay file?

/ {
chosen {
zephyr,console = &uart20;
zephyr,uart-mcumgr = &uart20; /* optional */
};
};

In your overlay file, you are just defining the pinctrl, etc, but I think maybe without the chosen { zephyr,console = &uart20; } line, printk() may go to another backend (often RTT), which then looks like “no output.”

-Priyanka

RE: NRF Printk

LinJunXuan — Thu, 04 Sep 2025 10:08:49 GMT

Yes, my main function has nothing, only printk still hasn't output, but commenting out the above 2.4g prj.conf is enough. I think this problem can be reproduced. I don't understand why this happened

RE: NRF Printk

Priyanka — Thu, 04 Sep 2025 09:12:30 GMT

Hi,

i am a bit confused with what your issue is.

Could you tell me a bit more clearly as to what your current problem is?

Is it that you are not observing any output even though you are using printk statements?

-Priyanka

RE: NRF Printk

LinJunXuan — Wed, 03 Sep 2025 09:01:19 GMT

I found the problem, it's really strange. I just wanted to engineer code that can use 2.4G and BLE, but surprisingly

# CONFIG_NCS_SAMPLES_DEFAULTS=y
# CONFIG_DK_LIBRARY=y

# CONFIG_LOG=y
# CONFIG_LOG_DEFAULT_LEVEL=3
# CONFIG_LOG_MODE_DEFERRED=y

# # ESB
# CONFIG_ESB=y

# # RADIO DEBUGGING/PERF MEASUREMENT
# CONFIG_PPI_TRACE=y

# # MULTI-ROLE
# CONFIG_MPSL=y
# CONFIG_BT_UNINIT_MPSL_ON_DISABLE=y

# # CONFIG_MPSL_TIMESLOT_SESSION_COUNT=2

# # CONFIG_SHARED_INTERRUPTS=y # this one seems no good
# CONFIG_DYNAMIC_INTERRUPTS=y
# CONFIG_DYNAMIC_DIRECT_INTERRUPTS=y

# CONFIG_ESB_DYNAMIC_INTERRUPTS=y
# CONFIG_MPSL_DYNAMIC_INTERRUPTS=y

I just need to annotate here, why is this happening????

RE: NRF Printk

LinJunXuan — Wed, 03 Sep 2025 08:53:48 GMT

Hello, I have encountered a very strange problem now. My initialization has blocked all my code, only Printk but no printing. Is it possible that there is a problem with my project?? This is my overlay

// 根目录
/ {	
 	zephyr,user {
		
	// ADC 通道
	// io-channels 			= <&adc 1>;
	// 鼠标按键 : 	左 		右 		中 		FB(前进) 	BB(后退)
	mouse_key_left-gpios 		= <&gpio1 13 ( GPIO_ACTIVE_LOW )>;
	mouse_key_right-gpios 		= <&gpio1 9  ( GPIO_ACTIVE_LOW )>;
	mouse_key_center-gpios 		= <&gpio1 8  ( GPIO_ACTIVE_LOW )>;
	mouse_key_fb-gpios 			= <&gpio0 4  ( GPIO_ACTIVE_LOW )>;
	// // mouse_key_bb-gpios 	= <&gpio1 13 GPIO_ACTIVE_HIGH>;
	// // mouse_test_led-gpios 		= <&gpio2 9 GPIO_ACTIVE_HIGH >;
	board_led0-gpios = <&gpio2 9  	GPIO_ACTIVE_HIGH>;
	board_led1-gpios = <&gpio1 10  	GPIO_ACTIVE_HIGH>;
	board_led2-gpios = <&gpio2 7  	GPIO_ACTIVE_HIGH>;
	board_led3-gpios = <&gpio1 14  	GPIO_ACTIVE_HIGH>;

	// 编码器
	encoder_one_ea-gpios 		= <&gpio1 5 ( GPIO_ACTIVE_LOW )>;
	encoder_one_eb-gpios 		= <&gpio1 6  ( GPIO_ACTIVE_LOW )>;

	// 拨码开关 三段
	// mode_switch_24g-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
	// mode_switch_ble-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;	
	// mode_usb_gpios 	  	  = <&gpio1 13 GPIO_ACTIVE_LOW>;	

 	};
	
};



&pinctrl {

	// SPI30
	paw3950_spi30_default: paw3950_spi30_default{
		group1{
			psels = <NRF_PSEL(SPIM_SCK,0,3)>,
			<NRF_PSEL(SPIM_MISO,0,1)>,
			<NRF_PSEL(SPIM_MOSI,0,2)>;
		};
	};

	paw3950_spi30_sleep:paw3950_spi30_sleep{
		group1{
			psels = <NRF_PSEL(SPIM_SCK,0,3)>,
			<NRF_PSEL(SPIM_MISO,0,1)>,
			<NRF_PSEL(SPIM_MOSI,0,2)>;
			low-power-enable;
		};
	};

	// uart
	debug_uart20_default: debug_uart20_default {
        group1 {
            psels = <NRF_PSEL(UART_TX, 1, 4)>;
        };
    };
	debug_uart20_sleep: debug_uart20_sleep {
        group1 {
            psels = <NRF_PSEL(UART_TX, 1, 4)>;
			low-power-enable;
        };
    };
};

mouse_debug:&uart20 {
	status = "okay";
	current-speed = <115200>;
	pinctrl-0 = <&debug_uart20_default>;
	pinctrl-1 = <&debug_uart20_sleep>;
	pinctrl-names = "default","sleep";
};


// ADC
mouse_vbat_adc:&adc{
	#address-cells = <1>;
	#size-cells = <0>;
	channel@5 {
		reg = <5>;
		zephyr,gain = "ADC_GAIN_1";
		zephyr,reference = "ADC_REF_INTERNAL";
		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
		zephyr,input-positive = <NRF_SAADC_AIN5>; /* P1.12 */
		zephyr,resolution = <12>;
	};
};




/** SPI 描述 */
mouse_paw3950:&spi30 {
    compatible = "nordic,nrf-spim";
    status = "okay";
    pinctrl-0 = <&paw3950_spi30_default>;
    pinctrl-1 = <&paw3950_spi30_sleep>;
    pinctrl-names = "default", "sleep";
    cs-gpios = <&gpio0 0 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
    paw3950: mspi-device@0 {
        compatible = "bosch,bme280";
        reg = <0>;
        spi-max-frequency = <1000000>;
		label = "paw3950";
    };
};










&temp {
 status = "okay";
};

&power {
 status = "okay";
};


// 关闭

&button1 {
    status = "disabled";
};

&button0 {
    status = "disabled";
};

&button2 {
    status = "disabled";
};

&button3 {
    status = "disabled";
};

&led0 {
    status = "disabled";
};

&led1 {
    status = "disabled";
};

&led2 {
    status = "disabled";
};

&led3 {
    status = "disabled";
};

// &spi00 {
// 	status = "disable";
// };

// &nfct {
// 	status = "disable";
// };


&timer20 {
 status = "disabled";
};


// 删除
/delete-node/ &mx25r64;

/delete-node/ &{/pin-controller/pwm20_default/group1/};

// /delete-node/ &{/soc/peripheral@40000000/uart@c6000/a01nyub/};

/delete-node/ &{/pin-controller/uart20_default/group2/};

my code

#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>

#include "app_task.h"



int main()
{
    // app_driver_init();
    // bsp_24g_init();
    while(1)
    {
        printk("dasdsadsa");
        // k_msleep(1000);
        // k_sleep(K_MSEC(0xFFFFFFFF));
        // app_task_schedule();
        
    }
}

RE: NRF Printk

Priyanka — Wed, 03 Sep 2025 08:18:06 GMT

No, the build folder will as usual be placed in your project folder itself, but the overlays need to be placed in a separate "boards" file in your project folder. Similar to this:

[quote user="LinJunXuan"] Assuming I am currently in NS
nrf54l15dk_nrf54l15_cpuapp_ns.overlay?[/quote]

Yes that's right.

-Priyanka

RE: NRF Printk

LinJunXuan — Tue, 02 Sep 2025 13:59:19 GMT

nrf54l15dk_nrf54l15_cpuapp.overlay ?

Will the overlay built directly in the future be placed in the boards folder according to the boards we configured? Assuming I am currently in NS
nrf54l15dk_nrf54l15_cpuapp_ns.overlay?

RE: NRF Printk

Priyanka — Tue, 02 Sep 2025 13:32:28 GMT

[quote user="LinJunXuan"]what are the requirements for the TX setting of UART20, and whether it only needs to be the P1 port that is not used. ？[/quote]

Yes, UART20 TX must be mapped to an unused P1 pin.

[quote user="LinJunXuan"] If I encounter the problem of not being able to create an overlay and need to manually create it, what should be the naming convention?[/quote]

You need to name it nrf54l15dk\nrf54l15\cpuapp.overlay and place it in a folder called boards in you project file.

-Priyanka

RE: NRF Printk

LinJunXuan — Thu, 28 Aug 2025 10:01:09 GMT

Can the TX pin of this UART be set arbitrarily? Last time, I randomly set the CLK pin of SPI and found that there was no clock, but MOSI, MISO, and CS. Later, I discovered that CLK must be set on a pin with the CLK suffix to have a clock.
So the main issue is what are the requirements for the TX setting of UART20, and whether it only needs to be the P1 port that is not used. ？

Sometimes I want to create an Overlay, but I don't know why VSCode doesn't pop up the overlay file. I just copy the overlay that I successfully created before. If I encounter the problem of not being able to create an overlay and need to manually create it, what should be the naming convention?

RE: NRF Printk

Priyanka — Thu, 28 Aug 2025 09:00:52 GMT

Hi,

Apologies for the delay. I was held up with an internal case.

Could you tell me which sample you are trying so that I can try to reproduce the issue here at my end?

-Priyanka

RE: NRF Printk

LinJunXuan — Thu, 14 Aug 2025 07:04:02 GMT

There is another issue, which is that when I am using the Bluetooth routine (which is a routine for Bluetooth practice one), the board selected 'compact' without any error, but when I selected 'Nordic Soc', it reported an error, and the error that kept happening was' Clock '. I have been following Nordic's AI to solve this problem, but it has not been resolved

RE: NRF Printk

LinJunXuan — Thu, 14 Aug 2025 06:58:04 GMT

yes

RE: NRF Printk

Priyanka — Thu, 14 Aug 2025 06:49:07 GMT

Hi,

Do you mean to say that the P1.05 that you are using the code doesn't seem to get the output, but only when you use P1.04, it works?

Regards,

Priyanka