diff --git a/app/boards/arm/nucleo_wb55cg_dongle/Kconfig.board b/app/boards/arm/nucleo_wb55cg_dongle/Kconfig.board
new file mode 100644
index 00000000..10a46bb7
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/Kconfig.board
@@ -0,0 +1,8 @@
+# STM32WB55CG Nucleo USB dongle configuration
+
+# Copyright (c) 2021 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config BOARD_NUCLEO_WB55CG_DONGLE
+	bool "Nucleo WB55CG USB Dongle"
+	depends on SOC_STM32WB55XX
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/Kconfig.defconfig b/app/boards/arm/nucleo_wb55cg_dongle/Kconfig.defconfig
new file mode 100644
index 00000000..bcf39361
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/Kconfig.defconfig
@@ -0,0 +1,33 @@
+# STM32LWB55CG USB dongle configuration
+
+# Copyright (c) 2021 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if BOARD_NUCLEO_WB55CG_DONGLE
+
+config BOARD
+	default "nucleo_wb55cg_dongle"
+
+config CLOCK_STM32_LSE
+	default y
+
+choice STM32_LPTIM_CLOCK
+	default STM32_LPTIM_CLOCK_LSE
+	depends on STM32_LPTIM_TIMER
+endchoice
+
+choice BT_HCI_BUS_TYPE
+	default BT_STM32_IPM
+	depends on BT
+endchoice
+
+config SYSTEM_WORKQUEUE_STACK_SIZE
+	default 2048
+
+config ZMK_USB
+	default y
+
+config ZMK_KSCAN_MATRIX_POLLING
+	default y
+
+endif # BOARD_NUCLEO_WB55CG
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/README.md b/app/boards/arm/nucleo_wb55cg_dongle/README.md
new file mode 100644
index 00000000..db27842c
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/README.md
@@ -0,0 +1,10 @@
+# Nucleo WB55CG dongle support for [Zephirum](http://zephirum.tuxfamily.org)
+
+Zephirum is an ergo monoblock angled keyboards powered by a Nucleo
+WB55CG USB dongle.
+
+## Building ZMK firmware
+
+```
+west build -b nucleo_wb55cg_dongle -- -DSHIELD=zephirum
+```
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/board.cmake b/app/boards/arm/nucleo_wb55cg_dongle/board.cmake
new file mode 100644
index 00000000..70cc9cb4
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/board.cmake
@@ -0,0 +1,6 @@
+# Copyright (c) 2021 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+board_runner_args(dfu-util "--pid=0483:df11" "--alt=0" "--dfuse")
+
+include(${ZEPHYR_BASE}/boards/common/dfu-util.board.cmake)
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.dts b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.dts
new file mode 100644
index 00000000..f640c4fa
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.dts
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ * SPDX-License-Identifier: MIT
+ */
+
+/dts-v1/;
+#include <st/wb/stm32wb55Xg.dtsi>
+#include <st/wb/stm32wb55cgux-pinctrl.dtsi>
+
+/ {
+	model = "STMicroelectronics STM32WB55CG USB dongle";
+	compatible = "st,stm32wb55cg-dongle";
+
+	chosen {
+		zephyr,bt-mon-uart = &lpuart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		blue_led_1: led_0 {
+			gpios = <&gpioa 4 GPIO_ACTIVE_HIGH>;
+			label = "D1";
+		};
+		green_led_2: led_1 {
+			gpios = <&gpiob 0 GPIO_ACTIVE_HIGH>;
+			label = "D2";
+		};
+		red_led_3: led_2 {
+			gpios = <&gpiob 1 GPIO_ACTIVE_HIGH>;
+			label = "D3";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		user_button_1: button_0 {
+			label = "SW1";
+			gpios = <&gpioa 10 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		};
+	};
+
+	aliases {
+		led0 = &blue_led_1;
+		led1 = &green_led_2;
+		led2 = &red_led_3;
+		sw0 = &user_button_1;
+	};
+};
+
+&i2c1 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+	pinctrl-0 = <&i2c1_scl_pb8 &i2c1_sda_pb9>;
+};
+
+&rtc {
+	status = "okay";
+};
+
+&spi1 {
+	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pa7>;
+	status = "okay";
+};
+
+&timers2 {
+	status = "okay";
+	pwm2: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim2_ch1_pa0>;
+	};
+};
+
+&lpuart1 {
+	pinctrl-0 = <&lpuart1_tx_pa2 &lpuart1_rx_pa3>;
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&adc1 {
+	pinctrl-0 = <&adc1_in6_pa1>;
+	status = "okay";
+};
+
+&iwdg {
+	status = "okay";
+};
+
+&lptim1 {
+	status = "okay";
+};
+
+&usb {
+	status = "okay";
+	pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12>;
+};
+
+&flash0 {
+	/*
+	 * For more information, see:
+	 * http://docs.zephyrproject.org/latest/devices/dts/flash_partitions.html
+	 */
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Set all partitions with first 812K of flash */
+		/* last 212K are reseved for M0 usage */
+		/* Configure partitions to make use of the whole 812K */
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 0xc000>;
+		};
+		slot0_partition: partition@c000 {
+			label = "image-0";
+			reg = <0x0000C000 0x5c000>;
+		};
+		slot1_partition: partition@68000 {
+			label = "image-1";
+			reg = <0x00068000 0x5c000>;
+		};
+		scratch_partition: partition@c4000 {
+			label = "image-scratch";
+			reg = <0x000c4000 0x4000>;
+		};
+		storage_partition: partition@c8000 {
+			label = "storage";
+			reg = <0x000c8000 0x3000>;
+		};
+
+	};
+};
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.yaml b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.yaml
new file mode 100644
index 00000000..5b1b1415
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.yaml
@@ -0,0 +1,19 @@
+identifier: nucleo_wb55cg_dongle
+name: ST Nucleo WB55CG Dongle
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 96
+flash: 1024
+supported:
+  - gpio
+  - i2c
+  - counter
+  - spi
+  - pwm
+  - adc
+  - watchdog
+  - usb_device
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.zmk.yml b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.zmk.yml
new file mode 100644
index 00000000..ee7972ce
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle.zmk.yml
@@ -0,0 +1,9 @@
+file_format: "1"
+id: nucleo_wb55cg_dongle
+name: ST Nucleo WB55CG Dongle
+type: board
+arch: arm
+outputs:
+  - usb
+url: https://www.st.com/en/evaluation-tools/p-nucleo-wb55.html
+exposes: [nucleo_wb55cg_dongle]
diff --git a/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle_defconfig b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle_defconfig
new file mode 100644
index 00000000..65c738cd
--- /dev/null
+++ b/app/boards/arm/nucleo_wb55cg_dongle/nucleo_wb55cg_dongle_defconfig
@@ -0,0 +1,26 @@
+CONFIG_SOC_SERIES_STM32WBX=y
+CONFIG_SOC_STM32WB55XX=y
+# 32MHz system clock
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=32000000
+
+# enable pinmux
+CONFIG_PINMUX=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+# clock configuration
+CONFIG_CLOCK_CONTROL=y
+# SYSCLK selection
+# CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
+CONFIG_CLOCK_STM32_SYSCLK_SRC_HSE=y
+CONFIG_CLOCK_STM32_HSE_CLOCK=32000000
+
+CONFIG_CLOCK_STM32_CPU1_PRESCALER=1
+CONFIG_CLOCK_STM32_CPU2_PRESCALER=1
+CONFIG_CLOCK_STM32_APB1_PRESCALER=1
+CONFIG_CLOCK_STM32_APB2_PRESCALER=1
+CONFIG_CLOCK_STM32_AHB4_PRESCALER=1
+
+# Enable MPU
+CONFIG_ARM_MPU=y
diff --git a/app/boards/shields/zephirum/Kconfig.defconfig b/app/boards/shields/zephirum/Kconfig.defconfig
new file mode 100644
index 00000000..28b601ca
--- /dev/null
+++ b/app/boards/shields/zephirum/Kconfig.defconfig
@@ -0,0 +1,45 @@
+# Copyright (c) 2021 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_ZEPHIRUM
+
+config ZMK_KEYBOARD_NAME
+	default "Zephirum"
+
+if ZMK_DISPLAY
+
+config I2C
+	default y
+
+config SSD1306
+	default y
+
+config SSD1306_REVERSE_MODE
+	default y
+
+endif # ZMK_DISPLAY
+
+if LVGL
+
+config LVGL_HOR_RES_MAX
+	default 128
+
+config LVGL_VER_RES_MAX
+	default 32
+
+config LVGL_VDB_SIZE
+	default 64
+
+config LVGL_DPI
+	default 148
+
+config LVGL_BITS_PER_PIXEL
+	default 1
+
+choice LVGL_COLOR_DEPTH
+	default LVGL_COLOR_DEPTH_1
+endchoice
+
+endif # LVGL
+
+endif
diff --git a/app/boards/shields/zephirum/Kconfig.shield b/app/boards/shields/zephirum/Kconfig.shield
new file mode 100644
index 00000000..6ad77217
--- /dev/null
+++ b/app/boards/shields/zephirum/Kconfig.shield
@@ -0,0 +1,8 @@
+ #
+ # Copyright (c) 2021 The ZMK Contributors
+ #
+ # SPDX-License-Identifier: MIT
+ #
+
+config SHIELD_ZEPHIRUM
+	def_bool $(shields_list_contains,zephirum)
diff --git a/app/boards/shields/zephirum/README.md b/app/boards/shields/zephirum/README.md
new file mode 100644
index 00000000..97c7b893
--- /dev/null
+++ b/app/boards/shields/zephirum/README.md
@@ -0,0 +1,27 @@
+# [Zephirum](http://zephirum.tuxfamily.org)
+
+## Description
+
+Despite having a look similar to many other ergo monoblock angled
+keyboards, this build has a couple of unique features:
+
+- it has been designed with [LibrePCB](https://librepcb.org/). This EDA
+  tool deserves more love, so I published the project & library files
+  under CC0 1.0 licence.
+
+- its MCU board is a Nucleo STM32WB55CG USB dongle (MB1293); it is
+  surface mounted on the top to showcase it ☺
+
+Regarding the other features, they are more classic:
+
+- it has been designed for Kailh Choc switches with MBK keycaps
+  (L=17.5mm × H=16.5mm)
+
+- it is powered by ZMK; only USB HID is supported so far.
+
+- it features an I²C 128x32 OLED screen (SSD1306)
+
+
+## Resources
+
+<https://git.tuxfamily.org/zephirum>
diff --git a/app/boards/shields/zephirum/zephirum.conf b/app/boards/shields/zephirum/zephirum.conf
new file mode 100644
index 00000000..8e69699d
--- /dev/null
+++ b/app/boards/shields/zephirum/zephirum.conf
@@ -0,0 +1,2 @@
+# Uncomment the following line to enable OLED display.
+# CONFIG_ZMK_DISPLAY=y
diff --git a/app/boards/shields/zephirum/zephirum.keymap b/app/boards/shields/zephirum/zephirum.keymap
new file mode 100644
index 00000000..701d424e
--- /dev/null
+++ b/app/boards/shields/zephirum/zephirum.keymap
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/bt.h>
+#include <dt-bindings/zmk/outputs.h>
+
+#define BASE        0
+#define SYMBOLS     1
+#define NUM_NAV     2
+
+#define COMPOSE CAPS
+
+/ {
+	keymap {
+		compatible = "zmk,keymap";
+
+		default_layer {
+			label = "Base";
+
+			bindings = <
+&kp COMPOSE &kp Q &kp W &kp E &kp R &kp T   &kp Y &kp U &kp I     &kp O   &kp P     &kp SQT
+&kp TAB     &kp A &kp S &kp D &kp F &kp G   &kp H &kp J &kp K     &kp L   &kp SEMI  &kp ENTER
+&sk LGUI    &kp Z &kp X &kp C &kp V &kp B   &kp N &kp M &kp COMMA &kp DOT &kp SLASH &kp MINUS
+&sl SYMBOLS &kp BSPC &sk LCTRL &sl NUM_NAV
+&none       &sk LALT &kp SPACE &sk RSHIFT
+			>;
+		};
+
+		symbols_layer {
+			label = "Symbols";
+			bindings = <
+&kp ESC &none     &kp LT    &kp EQUAL &kp GT   &kp MINUS  &kp TILDE &kp LBKT  &kp UNDER &kp RBKT &none     &none
+&none   &kp HASH  &kp LPAR  &kp DLLR  &kp RPAR &kp EXCL	  &kp AT    &kp LBRC  &kp STAR  &kp RBRC &kp COLON &trans
+&trans  &kp CARET &kp PRCNT &kp PIPE  &kp BSLH &kp PLUS	  &kp AMPS  &kp GRAVE &kp DQT   &kp SQT  &kp QMARK &none
+&trans      &kp DEL  &trans    &none
+&none       &trans   &none     &trans
+			>;
+		};
+
+		num_nav_layer {
+			label = "Num/Nav";
+			bindings = <
+&kp ESC &kp N1 &kp N2   &kp N3    &kp N4  &kp N5  &kp N6 &kp N7   &kp N8   &kp N9    &kp N0 &none
+&none   &none  &kp HOME &kp PG_UP &kp END &none   &none  &kp LEFT &kp UP   &kp RIGHT &none  &trans
+&trans  &none  &none    &kp PG_DN &none   &none   &none  &none    &kp DOWN &trans     &none  &none
+&none       &none    &trans    &trans
+&none       &trans   &trans     &trans
+			>;
+		};
+	};
+};
diff --git a/app/boards/shields/zephirum/zephirum.overlay b/app/boards/shields/zephirum/zephirum.overlay
new file mode 100644
index 00000000..8bc61ac4
--- /dev/null
+++ b/app/boards/shields/zephirum/zephirum.overlay
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <dt-bindings/zmk/matrix_transform.h>
+
+/ {
+	chosen {
+		zmk,kscan = &kscan;
+		zmk,matrix_transform = &default_transform;
+	};
+
+	default_transform: keymap_transform_0 {
+		compatible = "zmk,matrix-transform";
+		columns = <12>;
+		rows = <4>;
+		map = <
+RC(0,0) RC(0,1) RC(0,2) RC(0,3) RC(0,4) RC(0,5)   RC(3,5) RC(3,4) RC(3,3) RC(3,2) RC(3,1) RC(3,0)
+RC(1,0) RC(1,1) RC(1,2) RC(1,3) RC(1,4) RC(1,5)   RC(4,5) RC(4,4) RC(4,3) RC(4,2) RC(4,1) RC(4,0)
+RC(2,0) RC(2,1) RC(2,2) RC(2,3) RC(2,4) RC(2,5)   RC(5,5) RC(5,4) RC(5,3) RC(5,2) RC(5,1) RC(5,0)
+                RC(2,6) RC(6,0) RC(6,1) RC(6,2)   RC(6,3) RC(6,4) RC(6,5) RC(5,6)
+>;
+	};
+
+	kscan: kscan {
+		compatible = "zmk,kscan-gpio-matrix";
+		label = "KSCAN";
+		diode-direction = "col2row";
+
+		debounce-press-ms   = <1>;
+		debounce-release-ms = <30>;
+
+		col-gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>,
+		            <&gpioa 6 GPIO_ACTIVE_HIGH>,
+		            <&gpioa 7 GPIO_ACTIVE_HIGH>,
+		            <&gpioa 1 GPIO_ACTIVE_HIGH>,
+		            <&gpioa 8 GPIO_ACTIVE_HIGH>,
+		            <&gpioa 9 GPIO_ACTIVE_HIGH>,
+		            <&gpiob 2 GPIO_ACTIVE_HIGH>;
+
+		row-gpios = <&gpiob 6 (GPIO_ACTIVE_HIGH  | GPIO_PULL_DOWN)>,
+		            <&gpioa 3 (GPIO_ACTIVE_HIGH  | GPIO_PULL_DOWN)>,
+		            <&gpioa 2 (GPIO_ACTIVE_HIGH  | GPIO_PULL_DOWN)>,
+		            <&gpiob 3 (GPIO_ACTIVE_HIGH  | GPIO_PULL_DOWN)>,
+		            <&gpioa 14 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>,
+		            <&gpioa 13 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>,
+		            <&gpioa 0 (GPIO_ACTIVE_HIGH  | GPIO_PULL_DOWN)>;
+	};
+};
+
+&i2c1 {
+	status = "okay";
+
+	oled: ssd1306@3c {
+		compatible = "solomon,ssd1306fb";
+		reg = <0x3c>;
+		label = "DISPLAY";
+		width = <128>;
+		height = <32>;
+		segment-offset = <0>;
+		page-offset = <0>;
+		display-offset = <0>;
+		multiplex-ratio = <31>;
+		segment-remap;
+		com-invdir;
+		com-sequential;
+		prechargep = <0x22>;
+	};
+};
diff --git a/app/boards/shields/zephirum/zephirum.zmk.yml b/app/boards/shields/zephirum/zephirum.zmk.yml
new file mode 100644
index 00000000..a532b519
--- /dev/null
+++ b/app/boards/shields/zephirum/zephirum.zmk.yml
@@ -0,0 +1,10 @@
+file_format: "1"
+id: zephirum
+name: Zephirum
+type: shield
+url: http://zephirum.tuxfamily.org/
+requires: [nucleo_wb55cg_dongle]
+exposes: [i2c_oled]
+features:
+  - keys
+  - display