boards: others: add candleLight USB to CAN 2.0B adapter board

Add support for the open-hardware candleLight USB to CAN 2.0B board.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

boards/others/candlelight/Kconfig.candlelight

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+# Copyright (c) 2024 Henrik Brix Andersen <henrik@brixandersen.dk>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_CANDLELIGHT
+	select SOC_STM32F072XB

boards/others/candlelight/board.cmake

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+# Copyright (c) 2024 Henrik Brix Andersen <henrik@brixandersen.dk>
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(dfu-util "--pid=0483:df11" "--alt=0" "--dfuse")
+board_runner_args(jlink "--device=STM32F072CB")
+
+include(${ZEPHYR_BASE}/boards/common/dfu-util.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/others/candlelight/board.yml

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+board:
+  name: candlelight
+  full_name: candleLight
+  vendor: others
+  socs:
+    - name: stm32f072xb

boards/others/candlelight/candlelight.dts

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+/*
+ * Copyright (c) 2024 Henrik Brix Andersen <henrik@brixandersen.dk>
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <st/f0/stm32f072Xb.dtsi>
+#include <st/f0/stm32f072c(8-b)tx-pinctrl.dtsi>
+
+/ {
+	model = "candleLight";
+	compatible = "candlelight";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+		zephyr,canbus = &can1;
+	};
+
+	aliases {
+		led0 = &led_rx;
+		led1 = &led_tx;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led_rx: led_rx {
+			gpios = <&gpioa 0 GPIO_ACTIVE_HIGH>;
+			label = "LED RX";
+		};
+		led_tx: led_tx {
+			gpios = <&gpioa 1 GPIO_ACTIVE_HIGH>;
+			label = "LED TX";
+		};
+	};
+
+	transceiver0: can-phy0 {
+		compatible = "nxp,tja1051", "can-transceiver-gpio";
+		enable-gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
+		max-bitrate = <1000000>;
+		#phy-cells = <0>;
+	};
+};
+
+&clk_hsi {
+	status = "okay";
+	clock-frequency = <DT_FREQ_M(8)>;
+};
+
+&pll {
+	prediv = <1>;
+	mul = <6>;
+	clocks = <&clk_hsi>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(48)>;
+	ahb-prescaler = <1>;
+	apb1-prescaler = <1>;
+};
+
+zephyr_udc0: &usb {
+	pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&can1 {
+	pinctrl-0 = <&can_rx_pb8 &can_tx_pb9>;
+	pinctrl-names = "default";
+	phys = <&transceiver0>;
+	status = "okay";
+};
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 DT_SIZE_K(48)>;
+			read-only;
+		};
+		slot0_partition: partition@c000 {
+			label = "image-0";
+			reg = <0x0000c000 DT_SIZE_K(80)>;
+		};
+	};
+};

boards/others/candlelight/candlelight.yaml

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+identifier: candlelight
+name: candleLight
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+ram: 16
+flash: 128
+supported:
+  - can
+  - gpio
+  - usb_device
+  - usbd
+vendor: others

boards/others/candlelight/candlelight_defconfig

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+CONFIG_GPIO=y

boards/others/candlelight/doc/index.rst

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+.. zephyr:board:: candlelight
+
+Overview
+********
+
+The candleLight is an open-hardware USB to CAN 2.0B adapter board available from a number of
+sources.
+
+Hardware
+********
+
+The candleLight board is equipped with a STM32F072CB microcontroller and features an USB connector,
+a DB-9M connector for the CAN bus, and two user LEDs. Schematics and component placement drawings
+are available in the `candleLight GitHub repository`_.
+
+Supported Features
+==================
+
+The ``candlelight`` board configuration supports the following hardware features:
+
++-----------+------------+-------------------------------------+
+| Interface | Controller | Driver/Component                    |
++===========+============+=====================================+
+| NVIC      | on-chip    | nested vector interrupt controller  |
++-----------+------------+-------------------------------------+
+| PINMUX    | on-chip    | pinmux                              |
++-----------+------------+-------------------------------------+
+| FLASH     | on-chip    | flash memory                        |
++-----------+------------+-------------------------------------+
+| GPIO      | on-chip    | gpio                                |
++-----------+------------+-------------------------------------+
+| USB       | on-chip    | USB                                 |
++-----------+------------+-------------------------------------+
+| CAN1      | on-chip    | CAN controller                      |
++-----------+------------+-------------------------------------+
+
+The default configuration can be found in the defconfig file:
+:zephyr_file:`boards/others/candlelight/candlelight_defconfig`.
+
+Other hardware features are not currently supported by the port.
+
+System Clock
+============
+
+The STM32F072CB PLL is driven by the internal RC oscillator (HSI) running at 8 MHz and
+configured to provide a system clock of 48 MHz.
+
+Programming and Debugging
+*************************
+
+Build and flash applications as usual (see :ref:`build_an_application` and
+:ref:`application_run` for more details).
+
+If flashing via USB DFU, short resistor ``R203`` when applying power to the candleLight in order to
+enter the built-in DFU mode.
+
+Here is an example for the :zephyr:code-sample:`blinky` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/basic/blinky
+   :board: candlelight
+   :goals: flash
+
+.. _candleLight GitHub repository:
+   https://github.com/HubertD/candleLight