boards/stm32c0316-dk: initial support

boards/stm32c0316-dk/Kconfig

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+# SPDX-FileCopyrightText: 2024 BISSELL Homecare, Inc.
+# SPDX-License-Identifier: LGPL-2.1-only
+
+config BOARD
+    default "stm32c0316-dk" if BOARD_STM32C0316_DK
+
+config  BOARD_STM32C0316_DK
+    bool
+    default y
+    select CPU_MODEL_STM32C031C6

boards/stm32c0316-dk/Makefile

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+MODULE = board
+
+include $(RIOTBASE)/Makefile.base

boards/stm32c0316-dk/Makefile.features

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+CPU = stm32
+CPU_MODEL = stm32c031c6
+
+# Put defined MCU peripherals here (in alphabetical order)
+FEATURES_PROVIDED += periph_timer
+FEATURES_PROVIDED += periph_uart

boards/stm32c0316-dk/Makefile.include

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+# we use shared STM32 configuration snippets
+INCLUDES += -I$(RIOTBASE)/boards/common/stm32/include
+
+# define the default port depending on the host OS
+PORT_LINUX ?= /dev/ttyACM0
+PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.SLAB_USBtoUART*)))
+
+# setup serial terminal
+include $(RIOTMAKE)/tools/serial.inc.mk
+
+PROGRAMMER ?= openocd
+OPENOCD_DEBUG_ADAPTER ?= stlink
+
+# openocd programmer is supported
+PROGRAMMERS_SUPPORTED += openocd
+
+# this board uses openocd
+include $(RIOTMAKE)/tools/openocd.inc.mk

boards/stm32c0316-dk/doc.md

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+@defgroup    boards_stm32c0316-dk STM32C0316-DK
+@ingroup     boards
+@brief       Support for the STM32C0316-DK board.
+
+## General information
+
+The ST [STM32C0316-DK](https://www.st.com/en/evaluation-tools/stm32c0316-dk.html)
+is an evaluation board supporting a ARM Cortex-M0 STM32C031C6 microcontroller
+with 8KB of RAM and 32KB of ROM Flash.
+
+## Pinout
+
+See [this application note as reference](https://www.st.com/resource/en/application_note/an5673-getting-started-with-stm32c0-mcu-hardware-development-stmicroelectronics.pdf).
+This means the responsibility is on the firmware configurer to take special
+care when configuring IO, ensuring that ports are not conflicting on each pin.
+
+## Flashing the Board
+
+A detailed description about the flashing process can be found on the
+[guides page](https://guide.riot-os.org/board_specific/stm32/).
+The board name for the STM32C0316-DK is `stm32c0316-dk` and the default
+programmer is OpenOCD. Please note that the STM32C0 series is only supported by
+OpenOCD versions newer than 0.12.0.

boards/stm32c0316-dk/include/board.h

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+/*
+ * SPDX-FileCopyrightText: 2024 BISSELL Homecare, Inc.
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/**
+ * @ingroup     boards_stm32c0316-dk
+ * @{
+ *
+ * @file
+ * @brief       Board specific definitions for the STM32C0316-DK
+ *
+ * @author      Jason Parker <Jason.Parker@bissell.com>
+ */
+
+#pragma once
+
+#include "cpu.h"
+#include "periph_conf.h"
+#include "periph_cpu.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LED0_PIN_NUM        5
+#define LED0_PORT           GPIO_PORT_A /**< GPIO port of LED 0 */
+#define LED0_PORT_NUM       PORT_A
+#define LED0_IS_INVERTED    1
+
+#ifdef __cplusplus
+}
+#endif
+
+#include "stm32_leds.h"
+
+/** @} */

boards/stm32c0316-dk/include/periph_conf.h

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+/*
+ * SPDX-FileCopyrightText: 2024 BISSELL Homecare, Inc.
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/**
+ * @ingroup     boards_stm32c0316-dk
+ * @{
+ *
+ * @file
+ * @brief       Configuration of CPU peripherals for STM32C0316-DK board
+ *
+ * @author      Jason Parker <Jason.Parker@bissell.com>
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include "cpu.h"
+#include "periph_cpu.h"
+#include "clk_conf.h"
+#include "cfg_rtt_default.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name    Timer configuration
+ * @{
+ */
+static const timer_conf_t timer_config[] = {
+    {
+        .dev      = TIM3,
+        .max      = 0x0000ffff,
+        .rcc_mask = RCC_APBENR1_TIM3EN,
+        .bus      = APB1,
+        .irqn     = TIM3_IRQn
+    }
+};
+
+#define TIMER_0_ISR         isr_tim3
+
+#define TIMER_NUMOF         ARRAY_SIZE(timer_config)
+
+#define TIMER_0_MAX_VALUE   0x0000FFFFUL /* the STM32C031 doesn't have a 32-bit timer */
+/** @} */
+
+/**
+ * @name    UART configuration
+ * @{
+ */
+static const uart_conf_t uart_config[] = {
+    { /* USART is connected to the ST-Link */
+        .dev        = USART1,
+        .rcc_mask   = RCC_APBENR2_USART1EN,
+        .rx_pin     = GPIO_PIN(PORT_B, 7),
+        .tx_pin     = GPIO_PIN(PORT_B, 6),
+        .rx_af      = GPIO_AF0,
+        .tx_af      = GPIO_AF0,
+        .bus        = APB12,
+        .irqn       = USART1_IRQn,
+    },
+    { /* this USART is connected to the Morpho-Connector */
+        .dev        = USART2,
+        .rcc_mask   = RCC_APBENR1_USART2EN,
+        .rx_pin     = GPIO_PIN(PORT_A, 3),
+        .tx_pin     = GPIO_PIN(PORT_A, 2),
+        .rx_af      = GPIO_AF1,
+        .tx_af      = GPIO_AF1,
+        .bus        = APB1,
+        .irqn       = USART2_IRQn,
+    },
+};
+
+#define UART_0_ISR          (isr_usart1)
+#define UART_1_ISR          (isr_usart2)
+
+#define UART_NUMOF          ARRAY_SIZE(uart_config)
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+/** @} */