boards: st: nucleo_g431kb: add support for nucleo g431kb

Add support for the nucleo g431kb Board.

Signed-off-by: Klaus Nagel <nagelkl01@gmail.com>

boards/st/nucleo_g431kb/Kconfig.nucleo_g431kb

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+# Copyright (c) 2024 Klaus Nagel <nagelkl01@gmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NUCLEO_G431KB
+	select SOC_STM32G431XX

boards/st/nucleo_g431kb/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+# keep first
+board_runner_args(stm32cubeprogrammer "--port=swd" "--reset-mode=hw")
+board_runner_args(pyocd "--target=stm32g431kbtx")
+
+# keep first
+include(${ZEPHYR_BASE}/boards/common/stm32cubeprogrammer.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/pyocd.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)

boards/st/nucleo_g431kb/board.yml

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+board:
+  name: nucleo_g431kb
+  full_name: Nucleo G431KB
+  vendor: st
+  socs:
+    - name: stm32g431xx

boards/st/nucleo_g431kb/doc/index.rst

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+.. _nucleo_g431kb_board:
+
+ST Nucleo G431KB
+################
+
+Overview
+********
+
+The Nucleo G431KB board features an ARM Cortex-M4 based STM32G431KB MCU
+with a wide range of connectivity support and configurations.
+Here are some highlights of the Nucleo G431KB board:
+
+- STM32 microcontroller in LQFP32 package
+- Arduino Nano V3 connectivity
+- On-board ST-LINK/V3E debugger/programmer
+- Flexible board power supply:
+
+  - USB VBUS or external source(3.3 V, 5 V, 7 - 12 V)
+  - Power management access point
+
+- Three LEDs: USB communication (LD1), power LED (LD3), user LED (LD2)
+- One push-button for RESET
+
+.. image:: img/nucleo_g431kb.webp
+  :align: center
+  :alt: Nucleo G431kB
+
+More information about the board can be found at the `Nucleo G431KB website`_.
+
+- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell.
+
+More information about STM32G431KB can be found here:
+
+- `STM32G431KB on www.st.com`_
+- `STM32G4 reference manual`_
+
+Supported Features
+==================
+
+The Zephyr ``nucleo_g431kb`` board target supports the following hardware features:
+
++-----------+------------+-------------------------------------+
+| Interface | Controller | Driver/Component                    |
++===========+============+=====================================+
+| NVIC      | on-chip    | nested vector interrupt controller  |
++-----------+------------+-------------------------------------+
+| UART      | on-chip    | serial port-polling;                |
+|           |            | serial port-interrupt               |
++-----------+------------+-------------------------------------+
+| PINMUX    | on-chip    | pinmux                              |
++-----------+------------+-------------------------------------+
+| GPIO      | on-chip    | gpio                                |
++-----------+------------+-------------------------------------+
+| PWM       | on-chip    | pwm                                 |
++-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
+
+Other hardware features are not yet supported on this Zephyr port.
+
+The default configuration can be found in the defconfig file:
+:zephyr_file:`boards/st/nucleo_g431kb/nucleo_g431kb_defconfig`
+
+
+Connections and IOs
+===================
+
+Nucleo G431KB Board has 6 GPIO controllers. These controllers are responsible for pin muxing,
+input/output, pull-up, etc.
+
+For more details please refer to `STM32G4 Nucleo-32 board User Manual`_.
+
+Default Zephyr Peripheral Mapping:
+----------------------------------
+
+.. rst-class:: rst-columns
+
+- LPUART_1_TX : PA2
+- LPUART_1_RX : PA3
+- LD2 : PB8
+- PWM_4_CH_3 : PB8
+- I2C_2_SCL : PA9
+- I2C_2_SDA : PA8
+
+System Clock
+------------
+
+The Nucleo G431KB System Clock could be driven by internal or external oscillator,
+as well as main PLL clock. By default the external oscillator is not connected to the board. Therefore only the internal
+High Speed oscillator is supported. By default System clock is driven by PLL clock at 170 MHz,
+the PLL is driven by the 16 MHz high speed internal oscillator.
+
+Serial Port
+-----------
+
+Nucleo G431KB board has 1 U(S)ARTs and one LPUART. The Zephyr console output is assigned to LPUART1.
+Default settings are 115200 8N1.
+
+Please note that LPUART1 baudrate is limited to 9600 if the MCU is clocked by LSE (32.768 kHz) in
+low power mode.
+
+Programming and Debugging
+*************************
+
+Nucleo G431KB Board includes an ST-Link/V3 embedded debug tool interface.
+
+Applications for the ``nucleo_g431kb`` board target can be built and
+flashed in the usual way (see :ref:`build_an_application` and
+:ref:`application_run` for more details).
+
+Flashing
+========
+
+The board is configured to be flashed using west `STM32CubeProgrammer`_ runner,
+so its :ref:`installation <stm32cubeprog-flash-host-tools>` is required.
+
+Alternatively, OpenOCD, or pyOCD can also be used to flash the board using
+the ``--runner`` (or ``-r``) option:
+
+.. code-block:: console
+
+   $ west flash --runner openocd
+   $ west flash --runner pyocd
+
+To enable support of the STM32G431KB SoC in pyOCD, its pack has to be installed first:
+
+.. code-block:: console
+
+   $ pyocd pack --update
+   $ pyocd pack --install stm32g431kb
+
+Flashing an application to Nucleo G431KB
+----------------------------------------
+
+Connect the Nucleo G431KB to your host computer using the USB port,
+then run a serial host program to connect with your Nucleo board.
+
+.. code-block:: console
+
+   $ minicom -D /dev/ttyACM0
+
+Now build and flash an application. Here is an example for
+:zephyr:code-sample:`hello_world`.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: nucleo_g431kb
+   :goals: build flash
+
+You should see the following message on the console:
+
+.. code-block:: console
+
+   $ Hello World! nucleo_g431kb/stm32g431xx
+
+Debugging
+=========
+
+You can debug an application in the usual way.  Here is an example for the
+:zephyr:code-sample:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: nucleo_g431kb
+   :maybe-skip-config:
+   :goals: debug
+
+References
+**********
+
+.. target-notes::
+
+.. _Nucleo G431KB website:
+    https://www.st.com/en/evaluation-tools/nucleo-g431kb.html
+
+.. _STM32G4 Nucleo-32 board User Manual:
+   https://www.st.com/resource/en/user_manual/um2397-stm32g4-nucleo32-board-mb1430-stmicroelectronics.pdf
+
+.. _STM32g431kb Nucleo-32 board schematic:
+    https://www.st.com/resource/en/schematic_pack/mb1430-g431kbt6-a02_schematic_internal.pdf
+
+.. _STM32G431KB on www.st.com:
+   https://www.st.com/en/microcontrollers-microprocessors/stm32g431kb.html
+
+.. _STM32G4 reference manual:
+   https://www.st.com/resource/en/reference_manual/rm0440-stm32g4-series-advanced-armbased-32bit-mcus-stmicroelectronics.pdf
+
+.. _STM32CubeProgrammer:
+   https://www.st.com/en/development-tools/stm32cubeprog.html

boards/st/nucleo_g431kb/nucleo_g431kb.dts

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+/*
+ * Copyright (c) 2024 Klaus Nagel, <nagelkl01@gmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <st/g4/stm32g431Xb.dtsi>
+#include <st/g4/stm32g431k(6-8-b)tx-pinctrl.dtsi>
+
+/ {
+	model = "STMicroelectronics STM32G431KB-NUCLEO board";
+	compatible = "st,stm32g431kb-nucleo";
+
+	chosen {
+		zephyr,console = &lpuart1;
+		zephyr,shell-uart = &lpuart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds: leds {
+		compatible = "gpio-leds";
+		green_led: led_0 {
+			gpios = <&gpiob 8 GPIO_ACTIVE_HIGH>;
+			label = "User LD2";
+		};
+
+	};
+
+	pwmleds {
+		compatible = "pwm-leds";
+
+		green_pwm_led: green_pwm_led {
+			pwms = <&pwm4 3 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+		};
+	};
+
+
+	aliases {
+		led0 = &green_led;
+		pwm-led0 = &green_pwm_led;
+		watchdog0 = &iwdg;
+	};
+};
+
+&clk_hsi {
+	status = "okay";
+};
+
+&clk_lsi {
+	status = "okay";
+};
+
+stm32_lp_tick_source: &lptim1 {
+	clocks = <&rcc STM32_CLOCK_BUS_APB1 0x80000000>,
+			 <&rcc STM32_SRC_LSI LPTIM1_SEL(3)>;
+	status = "okay";
+};
+
+/* Adjust the pll for a SYSTEM Clock of 170MHz  */
+&pll {
+	div-m = <4>;
+	mul-n = <85>;
+	div-p = <7>;
+	div-q = <2>;
+	div-r = <2>;
+	clocks = <&clk_hsi>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(170)>;
+	ahb-prescaler = <1>;
+	apb1-prescaler = <1>;
+	apb2-prescaler = <1>;
+};
+
+&lpuart1 {
+	pinctrl-0 = <&lpuart1_tx_pa2 &lpuart1_rx_pa3>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&timers4 {
+	st,prescaler = <10000>;
+	status = "okay";
+
+	pwm4: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim4_ch3_pb8>;
+		pinctrl-names = "default";
+	};
+};
+
+&i2c2 {
+	pinctrl-0 = <&i2c2_scl_pa9 &i2c2_sda_pa8>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&flash0 {
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Set 4Kb of storage at the end of the 128Kb of flash */
+		storage_partition: partition@1f000 {
+			label = "storage";
+			reg = <0x0001f000 DT_SIZE_K(4)>;
+		};
+	};
+};

boards/st/nucleo_g431kb/nucleo_g431kb.yaml

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+identifier: nucleo_g431kb
+name: ST Nucleo G431KB
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 32
+flash: 128
+supported:
+  - gpio
+  - pwm
+  - counter
+  - i2c
+vendor: st

boards/st/nucleo_g431kb/nucleo_g431kb_defconfig

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+# SPDX-License-Identifier: Apache-2.0
+
+# Serial drivers
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+# Console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# Enable HW stack protection
+CONFIG_HW_STACK_PROTECTION=y

boards/st/nucleo_g431kb/support/openocd.cfg

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+source [find interface/stlink.cfg]
+
+transport select hla_swd
+
+source [find target/stm32g4x.cfg]
+
+reset_config srst_only