Porting project from nrf52840 to nrf54L15 (device tree)

[bjornolsen]

Hello,

I have a program working well in SDK 2.9.1 on nrf52840DK. I want to port it over to nrf54L15DK.

Please help me identify corresponding ports I can use on nrf54L15. I am just listing the relevant ports, the code I am showing is incomplete.
Your help would be much appreciated.

I am using the following ports:

Overlay file

SPI display:

        dc-gpios = <&gpio0 30 GPIO_ACTIVE_HIGH>;
        reset-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
        spi-dev = <&spi3>;
        
&spi3_default {
	group1 {
		psels = <NRF_PSEL(SPIM_SCK, 0, 28)>,
				<NRF_PSEL(SPIM_MISO, 0, 4)>,
				<NRF_PSEL(SPIM_MOSI, 0, 29)>;
		nordic,drive-mode = <NRF_DRIVE_H0H1>;
	};
};

watchdog

// Watchdog
&wdt {
    status = "okay";
};

buttons:

/{
    aliases {
        sw0 = &button_left;
        sw1 = &button_right;
        sw2 = &button_select;
        sw3 = &button_select2;
    };
};
/{
    buttons {
        compatible = "gpio-keys";

        button_left: button_0 {
            gpios = <&gpio0 11 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
            label = "Button Up";
        };

        button_right: button_1 {
            gpios = <&gpio0 12 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
            label = "Button Down";
        };

        button_select: button_2 {
            gpios = <&gpio0 24 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
            label = "Button Select";
        };

		button_select2: button_3 {
            gpios = <&gpio0 25 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
            label = "Button Select2";
        };
    };
};

In code

LED / PWM:

#define PIN_R 13
#define PIN_G 14
#define PIN_B 15

static NRF_PWM_Type *pwm = NRF_PWM0;

Display backlight / PWM:

#define DISPLAY_PWM_INSTANCE NRF_PWM1

Storage (NVS) 

#define NVS_PARTITION             storage_partition

Wakeup pin

#define WAKEUP_PIN 24  

void configure_wakeup_pin(void) {
    nrf_gpio_cfg_input(WAKEUP_PIN, NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_sense_set(WAKEUP_PIN, NRF_GPIO_PIN_SENSE_LOW);
}

[AHaug]

Hi,

The best approach here is to go through the PS and find the relevant GPIOs so that they match your design https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/keyfeatures_html5.html#ariaid-title1 

A Nordic FAE has also made this unofficial experimental tool that you can try to use for pin planning that might be helpful: https://hlord2000.github.io/ 

You can also compare the nRF54L15 DK board files up towards your existing board file: https://github.com/nrfconnect/sdk-zephyr/blob/main/boards/nordic/nrf54l15dk/nrf54l15dk_common.dtsi 

SPI display:

This lesson shows how to configure a SPI screen in NCS v2.7.0-2.9.0

1. https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-5-serial-peripheral-interface-spi/topic/exercise-1-10/ 
2. https://github.com/NordicDeveloperAcademy/ncs-inter/blob/main/v2.9.0-v2.7.0/l5/l5_e1_sol/boards/nrf54l15dk_nrf54l15_cpuapp.overlay 

buttons:

See https://github.com/nrfconnect/sdk-zephyr/blob/main/boards/nordic/nrf54l15dk/nrf54l15dk_common.dtsi 

LED / PWM:

See 

• https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-4-pulse-width-modulation-pwm/ 
• https://github.com/nrfconnect/sdk-zephyr/blob/main/boards/nordic/nrf54l15dk/nrf54l15dk_common.dtsi  
• https://github.com/NordicDeveloperAcademy/ncs-inter/blob/main/v2.9.0-v2.7.0/l4/l4_e2_sol/boards/nrf54l15dk_nrf54l15_cpuapp.overlay 

Storage (NVS) 

The nRF54L uses RRAM instead of Flash, so you might want to evaluate migrating to ZMS backend https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/zms.html 

Kind regards,
Andreas

[bjornolsen]

Thank you - I will give it a go!

[AHaug]

Happy to help! 

Feel free to ask follow up questions if there are any uncertainties

Kind regards,
Andreas