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nrf52840_m2 add backlight configuration and pinctrl #3119

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nrf52840_m2 add backlight configuration and pinctrl #3119

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0a6c245
nrf52840_m2 update
BarbUk Nov 17, 2025
750ee41
Removing spi0 from pinctrl, the m2 board had a QSPI
BarbUk Nov 18, 2025
b894f98
Enable the led kconfig at the board level
BarbUk Nov 18, 2025
9a94d6f
Remove backlight configuration from board, we configure it from the s…
BarbUk Nov 18, 2025
ea2704b
Add more readable layer documentation
BarbUk Nov 18, 2025
de97a99
Add backlight control to default keymap
BarbUk Nov 18, 2025
155322d
Removing zmk,led from board, it will be added in the shield in anothe…
BarbUk Nov 19, 2025
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10 changes: 10 additions & 0 deletions app/boards/arm/nrf52840_m2/Kconfig.defconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -16,4 +16,14 @@ endif # USB_DEVICE_STACK
config BT_CTLR
default BT

if ZMK_BACKLIGHT

config PWM
default y

config LED_PWM
default y

endif # ZMK_BACKLIGHT

endif # BOARD_NRF52840_M2
56 changes: 56 additions & 0 deletions app/boards/arm/nrf52840_m2/nrf52840_m2-pinctrl.dtsi
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Original file line number Diff line number Diff line change
@@ -0,0 +1,56 @@
&pinctrl {
/* configuration for spi0 device, default state */
spi0_default: spi0_default {
/* node name is arbitrary */
group1 {
/* main role: configure P1.11 as SPI clock, P0.02 as SPI MOSI, P0.03 as SPI MISO */
psels = <NRF_PSEL(SPIM_SCK, 1, 11)>,
<NRF_PSEL(SPIM_MOSI, 1, 10)>,
<NRF_PSEL(SPIM_MISO, 1, 12)>;
};
};

/* configuration for spi0 device, sleep state */
spi0_sleep: spi0_sleep {
group1 {
/* main role: configure P1.11 as SPI clock, P0.02 as SPI MOSI, P0.03 as SPI MISO */
psels = <NRF_PSEL(SPIM_SCK, 1, 11)>,
<NRF_PSEL(SPIM_MOSI, 1, 10)>,
<NRF_PSEL(SPIM_MISO, 1, 12)>;
low-power-enable;
};
};

/* configuration for pwm device, default state */
pwm0_default: pwm0_default {
group1 {
psels = <NRF_PSEL(PWM_OUT0, 0, 30)>, // LED 0 (red)
<NRF_PSEL(PWM_OUT1, 0, 29)>, // LED 1 (green)
<NRF_PSEL(PWM_OUT2, 0, 31)>; // LED 2 (blue)
};
};
pwm0_sleep: pwm0_sleep {
group1 {
psels = <NRF_PSEL(PWM_OUT0, 0, 30)>, // LED 0
<NRF_PSEL(PWM_OUT1, 0, 29)>, // LED 1
<NRF_PSEL(PWM_OUT2, 0, 31)>; // LED 2
low-power-enable;
};
};

/* configuration for i2c0 device, default state */
i2c0_default: i2c0_default {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 5)>,
<NRF_PSEL(TWIM_SCL, 1, 6)>;
};
};

i2c0_sleep: i2c0_sleep {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 5)>,
<NRF_PSEL(TWIM_SCL, 1, 6)>;
low-power-enable;
};
};
};
46 changes: 42 additions & 4 deletions app/boards/arm/nrf52840_m2/nrf52840_m2.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@

/dts-v1/;
#include <nordic/nrf52840_qiaa.dtsi>
#include "nrf52840_m2-pinctrl.dtsi"

/ {
model = "Makerdiary nRF52840 M.2 module";
Expand All @@ -16,18 +17,23 @@
zephyr,sram = &sram0;
zephyr,flash = &flash0;
zmk,battery = &vbatt;
zmk,backlight = &backlight;
zmk,led = &is31fl3733;
};

leds {
compatible = "gpio-leds";
red_led: led_0 {
led1_red: led_1 {
gpios = <&gpio0 30 GPIO_ACTIVE_HIGH>;
label = "Red LED 1";
};
green_led: led_1 {
led1_green: led_2 {
gpios = <&gpio0 29 GPIO_ACTIVE_HIGH>;
label = "Green LED 1";
};
blue_led: led_2 {
led1_blue: led_3 {
gpios = <&gpio0 31 GPIO_ACTIVE_HIGH>;
label = "Blue LED 1";
};
};

Expand All @@ -38,6 +44,18 @@
full-ohms = <(1000000 + 1000000)>;
};

backlight: pwmleds {
compatible = "pwm-leds";
red_pwm_led: pwm_led_0 {
pwms = <&pwm0 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
};
green_pwm_led: pwm_led_1 {
pwms = <&pwm0 1 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
};
blue_pwm_led: pwm_led_2 {
pwms = <&pwm0 2 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
};
};
};

&adc {
Expand All @@ -56,12 +74,32 @@
status = "okay";
};

&pwm0 {
status = "okay";
pinctrl-0 = <&pwm0_default>;
pinctrl-1 = <&pwm0_sleep>;
pinctrl-names = "default", "sleep";
};

&i2c0 {
compatible = "nordic,nrf-twim";
status = "okay";
pinctrl-0 = <&i2c0_default>;
pinctrl-1 = <&i2c0_sleep>;
pinctrl-names = "default", "sleep";
clock-frequency = <I2C_BITRATE_FAST>;
is31fl3733: is31fl3733@50 {
compatible = "issi,is31fl3733";
reg = <0x50>;
sdb-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
};
};

zephyr_udc0: &usbd {
compatible = "nordic,nrf-usbd";
status = "okay";
};


&flash0 {
/*
* For more information, see:
Expand Down
4 changes: 2 additions & 2 deletions app/boards/arm/nrf52840_m2/nrf52840_m2_defconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -16,10 +16,10 @@ CONFIG_BUILD_OUTPUT_UF2=y

CONFIG_MPU_ALLOW_FLASH_WRITE=y
CONFIG_NVS=y
CONFIG_SETTINGS_NVS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y

CONFIG_ZMK_USB=y
CONFIG_ZMK_BLE=y
CONFIG_ZMK_BLE=y
CONFIG_PINCTRL=y