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boards: add steelseries apex_pro_mini
Initial support for the Apex Pro Mini keyboard, based on STM32L412. Signed-off-by: Eve Redero <eve.redero@gmail.com>
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‎boards/steelseries/apex_pro_mini/Kconfig.apex_pro_mini‎

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# Copyright (c) 2025 Eve Redero
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_APEX_PRO_MINI
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select SOC_STM32L412XX

‎boards/steelseries/apex_pro_mini/Kconfig.defconfig‎

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# Steelseries Apex Pro Mini keyboard configuration
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# Copyright (c) 2025 Eve Redero
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# SPDX-License-Identifier: Apache-2.0
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if BOARD_APEX_PRO_MINI
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config SPI_STM32_INTERRUPT
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default y
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depends on SPI
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config INPUT_KBD_MATRIX_16_BIT_ROW
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default y if INPUT_GPIO_KBD_MATRIX
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config SPI_NOR_FLASH_LAYOUT_PAGE_SIZE
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default 4096 if FLASH
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source "boards/common/usb/Kconfig.cdc_acm_serial.defconfig"
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endif # BOARD_APEX_PRO_MINI

‎boards/steelseries/apex_pro_mini/apex_pro_mini.dts‎

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/*
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* Copyright (c) 2025 Eve Redero
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/dts-v1/;
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#include <st/l4/stm32l412XB.dtsi>
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#include <st/l4/stm32l412rbtx-pinctrl.dtsi>
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#include <zephyr/dt-bindings/input/input-event-codes.h>
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#include <zephyr/dt-bindings/input/keymap.h>
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/ {
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model = "SteelSeries Apex Pro Mini board";
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compatible = "steelseries,apex_pro_mini", "st,stm32l412";
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chosen {
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zephyr,console = &cdc_acm_uart0;
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zephyr,shell-uart = &cdc_acm_uart0;
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zephyr,sram = &sram0;
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zephyr,flash = &flash0;
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};
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leds: leds {
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compatible = "gpio-leds";
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dbg_led: led_0 {
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gpios = <&gpioc 12 GPIO_ACTIVE_HIGH>;
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label = "User dbg tp";
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};
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};
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aliases {
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led0 = &dbg_led;
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volt-sensor0 = &vref;
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volt-sensor1 = &vbat;
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};
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kbd: kbd-matrix {
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compatible = "gpio-kbd-matrix";
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status = "okay";
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idle-mode = "poll";
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settle-time-us = <110>;
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no-ghostkey-check;
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col-drive-inactive;
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col-gpios = <&gpiob 0 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
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, <&gpiob 1 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
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, <&gpiob 2 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
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, <&gpiob 10 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
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, <&gpiob 11 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
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;
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row-gpios = <&gpioa 0 GPIO_ACTIVE_HIGH>
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, <&gpioa 1 GPIO_ACTIVE_HIGH>
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, <&gpioa 2 GPIO_ACTIVE_HIGH>
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, <&gpioa 3 GPIO_ACTIVE_HIGH>
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, <&gpioa 4 GPIO_ACTIVE_HIGH>
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, <&gpioa 5 GPIO_ACTIVE_HIGH>
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, <&gpioa 6 GPIO_ACTIVE_HIGH>
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, <&gpioa 7 GPIO_ACTIVE_HIGH>
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, <&gpioc 4 GPIO_ACTIVE_HIGH>
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, <&gpioc 5 GPIO_ACTIVE_HIGH>
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, <&gpioc 0 GPIO_ACTIVE_HIGH>
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, <&gpioc 1 GPIO_ACTIVE_HIGH>
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, <&gpioc 2 GPIO_ACTIVE_HIGH>
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, <&gpioc 3 GPIO_ACTIVE_HIGH>
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;
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keymap {
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compatible = "input-keymap";
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row-size = <14>;
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col-size = <5>;
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keymap = <MATRIX_KEY(0, 0, INPUT_KEY_ESC)
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MATRIX_KEY(1, 0, INPUT_KEY_1)
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MATRIX_KEY(2, 0, INPUT_KEY_2)
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MATRIX_KEY(3, 0, INPUT_KEY_3)
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MATRIX_KEY(4, 0, INPUT_KEY_4)
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MATRIX_KEY(5, 0, INPUT_KEY_5)
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MATRIX_KEY(6, 0, INPUT_KEY_6)
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MATRIX_KEY(7, 0, INPUT_KEY_7)
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MATRIX_KEY(8, 0, INPUT_KEY_8)
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MATRIX_KEY(9, 0, INPUT_KEY_9)
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MATRIX_KEY(10, 0, INPUT_KEY_0)
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MATRIX_KEY(11, 0, INPUT_KEY_MINUS)
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MATRIX_KEY(12, 0, INPUT_KEY_EQUAL)
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MATRIX_KEY(13, 0, INPUT_KEY_BACKSPACE)
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MATRIX_KEY(0, 1, INPUT_KEY_TAB)
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MATRIX_KEY(1, 1, INPUT_KEY_A)
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MATRIX_KEY(2, 1, INPUT_KEY_Z)
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MATRIX_KEY(3, 1, INPUT_KEY_E)
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MATRIX_KEY(4, 1, INPUT_KEY_R)
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MATRIX_KEY(5, 1, INPUT_KEY_T)
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MATRIX_KEY(6, 1, INPUT_KEY_Y)
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MATRIX_KEY(7, 1, INPUT_KEY_U)
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MATRIX_KEY(8, 1, INPUT_KEY_I)
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MATRIX_KEY(9, 1, INPUT_KEY_O)
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MATRIX_KEY(10, 1, INPUT_KEY_P)
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MATRIX_KEY(11, 1, INPUT_KEY_LEFTBRACE)
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MATRIX_KEY(12, 1, INPUT_KEY_RIGHTBRACE)
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MATRIX_KEY(0, 2, INPUT_KEY_CAPSLOCK)
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MATRIX_KEY(1, 2, INPUT_KEY_Q)
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MATRIX_KEY(2, 2, INPUT_KEY_S)
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MATRIX_KEY(3, 2, INPUT_KEY_D)
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MATRIX_KEY(4, 2, INPUT_KEY_F)
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MATRIX_KEY(5, 2, INPUT_KEY_G)
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MATRIX_KEY(6, 2, INPUT_KEY_H)
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MATRIX_KEY(7, 2, INPUT_KEY_J)
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MATRIX_KEY(8, 2, INPUT_KEY_K)
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MATRIX_KEY(9, 2, INPUT_KEY_L)
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MATRIX_KEY(10, 2, INPUT_KEY_M)
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MATRIX_KEY(11, 2, INPUT_KEY_SEMICOLON)
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MATRIX_KEY(12, 2, INPUT_KEY_BACKSLASH)
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MATRIX_KEY(13, 2, INPUT_KEY_ENTER)
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MATRIX_KEY(0, 3, INPUT_KEY_LEFTSHIFT)
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MATRIX_KEY(1, 3, INPUT_KEY_HOME)
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MATRIX_KEY(2, 3, INPUT_KEY_W)
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MATRIX_KEY(3, 3, INPUT_KEY_X)
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MATRIX_KEY(4, 3, INPUT_KEY_C)
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MATRIX_KEY(5, 3, INPUT_KEY_V)
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MATRIX_KEY(6, 3, INPUT_KEY_B)
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MATRIX_KEY(7, 3, INPUT_KEY_N)
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MATRIX_KEY(8, 3, INPUT_KEY_M)
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MATRIX_KEY(9, 3, INPUT_KEY_COMMA)
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MATRIX_KEY(10, 3, INPUT_KEY_DOT)
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MATRIX_KEY(11, 3, INPUT_KEY_SLASH)
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MATRIX_KEY(13, 3, INPUT_KEY_RIGHTSHIFT)
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MATRIX_KEY(0, 4, INPUT_KEY_LEFTCTRL)
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MATRIX_KEY(1, 4, INPUT_KEY_LEFTMETA)
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MATRIX_KEY(2, 4, INPUT_KEY_LEFTALT)
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MATRIX_KEY(4, 4, INPUT_KEY_SPACE)
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MATRIX_KEY(7, 4, INPUT_KEY_RIGHTALT)
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MATRIX_KEY(8, 4, INPUT_KEY_RIGHTMETA)
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MATRIX_KEY(9, 4, INPUT_KEY_COFFEE)
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MATRIX_KEY(10, 4, INPUT_KEY_RIGHTCTRL)>;
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};
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};
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};
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&clk_lsi {
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status = "okay";
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};
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&clk_hsi {
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status = "okay";
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};
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&clk_hsi48 {
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status = "okay";
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};
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&pll {
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div-m = <1>;
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mul-n = <10>;
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div-q = <2>;
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div-r = <2>;
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clocks = <&clk_hsi>;
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status = "okay";
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};
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&rcc {
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clocks = <&pll>;
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clock-frequency = <DT_FREQ_M(80)>;
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ahb-prescaler = <1>;
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apb1-prescaler = <1>;
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apb2-prescaler = <1>;
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};
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&usart1 {
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pinctrl-0 = <&usart1_tx_pb6 &usart1_rx_pb7>;
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pinctrl-names = "default";
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current-speed = <115200>;
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status = "okay";
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};
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&spi1 {
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pinctrl-0 = <&spi1_sck_pb3 &spi1_miso_pb4 &spi1_mosi_pb5>;
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pinctrl-names = "default";
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cs-gpios = <&gpioa 15 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
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status = "okay";
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flash1: fm25q128c@0 {
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compatible = "jedec,spi-nor";
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reg = <0>;
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spi-max-frequency = <DT_FREQ_M(10)>;
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size = <DT_SIZE_K(16384)>;
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jedec-id = [a1 40 14];
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has-dpd;
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};
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};
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&spi2 {
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pinctrl-0 = <&spi2_sck_pb13 &spi2_miso_pb14 &spi2_mosi_pb15>;
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pinctrl-names = "default";
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cs-gpios = <&gpiob 12 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
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status = "okay";
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};
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&timers2 {
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status = "okay";
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pwm2: pwm {
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status = "okay";
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pinctrl-0 = <&tim2_ch1_pa0>;
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pinctrl-names = "default";
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};
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};
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&rtc {
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clocks = <&rcc STM32_CLOCK_BUS_APB1 0x10000000>,
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<&rcc STM32_SRC_LSI RTC_SEL(2)>;
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status = "okay";
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};
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&flash1 {
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partitions {
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compatible = "fixed-partitions";
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#address-cells = <1>;
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#size-cells = <1>;
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storage_partition: partition@0 {
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label = "storage";
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reg = <0x0 DT_SIZE_K(16384)>;
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};
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};
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};
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&usb_fs_phy {
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status = "okay";
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};
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zephyr_udc0: &usb {
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status = "okay";
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pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12 &usb_noe_pa13>;
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pinctrl-names = "default";
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cdc_acm_uart0: cdc_acm_uart0 {
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compatible = "zephyr,cdc-acm-uart";
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};
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};
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&vref {
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status = "okay";
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};
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&vbat {
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status = "okay";
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};

‎boards/steelseries/apex_pro_mini/apex_pro_mini.yaml‎

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identifier: apex_pro_mini
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name: SteelSeries Apex Pro Mini
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type: mcu
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arch: arm
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toolchain:
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- zephyr
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- gnuarmemb
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- xtools
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ram: 40
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flash: 64
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supported:
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- gpio
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- usb
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- spi
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- flash
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- kbd-matrix
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vendor: steelseries

‎boards/steelseries/apex_pro_mini/apex_pro_mini_defconfig‎

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# SPDX-License-Identifier: Apache-2.0
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# Enable MPU
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CONFIG_ARM_MPU=y
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# Enable HW stack protection
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CONFIG_HW_STACK_PROTECTION=y
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# Enable GPIO
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CONFIG_GPIO=y

‎boards/steelseries/apex_pro_mini/board.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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board_runner_args(jlink "--device=STM32L412RB" "--speed=4000")
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include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)
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include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

‎boards/steelseries/apex_pro_mini/board.yml‎

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board:
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name: apex_pro_mini
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full_name: Apex Pro Mini
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vendor: steelseries
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socs:
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- name: stm32l412xx

‎boards/steelseries/apex_pro_mini/doc/img/apex_pro_mini.webp‎

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