add support for bluepill board

boards/bluepill/Makefile

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

boards/bluepill/Makefile.dep

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+ifneq (,$(filter saul_default,$(USEMODULE)))
+  USEMODULE += saul_gpio
+endif

boards/bluepill/Makefile.features

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+# Put defined MCU peripherals here (in alphabetical order)
+FEATURES_PROVIDED += periph_cpuid
+FEATURES_PROVIDED += periph_gpio
+FEATURES_PROVIDED += periph_pwm
+FEATURES_PROVIDED += periph_spi
+FEATURES_PROVIDED += periph_timer
+FEATURES_PROVIDED += periph_uart
+FEATURES_PROVIDED += periph_adc
+
+# Various other features (if any)
+FEATURES_PROVIDED += cpp
+
+# The board MPU family (used for grouping by the CI system)
+FEATURES_MCU_GROUP = cortex_m3_2

boards/bluepill/Makefile.include

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+## the cpu to build for
+export CPU = stm32f1
+export CPU_MODEL = stm32f103c8
+
+# define the default port depending on the host OS
+PORT_LINUX ?= /dev/ttyUSB0
+PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.SLAB_USBtoUART*)))
+
+# setup serial terminal
+include $(RIOTMAKE)/tools/serial.inc.mk
+
+# this board uses openocd
+include $(RIOTMAKE)/tools/openocd.inc.mk

boards/bluepill/board.c

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+/*
+ * Copyright (C) 2015 TriaGnoSys GmbH
+ *               2017 Alexander Kurth, Sören Tempel, Tristan Bruns
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_bluepill
+ * @{
+ *
+ * @file
+ * @brief       Board specific implementations for the bluepill board
+ *
+ * @author      Víctor Ariño <victor.arino@triagnosys.com>
+ * @author      Sören Tempel <tempel@uni-bremen.de>
+ * @author      Tristan Bruns <tbruns@uni-bremen.de>
+ * @author      Alexander Kurth <kurth1@uni-bremen.de>
+ *
+ * @}
+ */
+
+#include "board.h"
+#include "periph/gpio.h"
+
+void board_init(void)
+{
+    cpu_init();
+    gpio_init(LED0_PIN, GPIO_OUT);
+}

boards/bluepill/dist/openocd.cfg

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+source [find interface/stlink-v2.cfg]
+transport select hla_swd
+
+source [find target/stm32f1x.cfg]
+reset_config none separate
+
+$_TARGETNAME configure -rtos auto

boards/bluepill/include/board.h

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+/*
+ * Copyright (C) 2015 TriaGnoSys GmbH
+ *               2017 Alexander Kurth, Sören Tempel, Tristan Bruns
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_bluepill
+ * @{
+ *
+ * @file
+ * @brief       Peripheral MCU configuration for the bluepill board
+ *
+ * @author      Víctor Ariño <victor.arino@triagnosys.com>
+ * @author      Sören Tempel <tempel@uni-bremen.de>
+ * @author      Tristan Bruns <tbruns@uni-bremen.de>
+ * @author      Alexander Kurth <kurth1@uni-bremen.de>
+ *
+ */
+
+#ifndef BOARD_H
+#define BOARD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   LED pin definitions and handlers
+ * @{
+ */
+#define LED0_PORT           GPIOC
+#define LED0_PIN            GPIO_PIN(PORT_C, 13)
+#define LED0_MASK           (1 << 13)
+
+#define LED0_ON             (LED0_PORT->BSRR = LED0_MASK)
+#define LED0_OFF            (LED0_PORT->BSRR = (LED0_MASK << 16))
+#define LED0_TOGGLE         (LED0_PORT->ODR  ^= LED0_MASK)
+/** @} */
+
+/**
+ * @brief   Initialize board specific hardware, including clock, LEDs and std-IO
+ */
+void board_init(void);
+
+/**
+ * @brief Use the 2nd UART for STDIO on this board
+ */
+#define UART_STDIO_DEV      UART_DEV(1)
+
+/**
+ * @name    xtimer configuration
+ */
+#define XTIMER_WIDTH        (16)
+#define XTIMER_BACKOFF      5
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BOARD_H */
+/** @} */

boards/bluepill/include/gpio_params.h

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+/*
+ * Copyright (C) 2017 HAW Hamburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_stm32f130c8t6
+ * @{
+ *
+ * @file
+ * @brief       Board specific configuration of direct mapped GPIOs
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ */
+
+#ifndef GPIO_PARAMS_H
+#define GPIO_PARAMS_H
+
+#include "board.h"
+#include "saul/periph.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief    GPIO pin configuration
+ */
+static const  saul_gpio_params_t saul_gpio_params[] =
+{
+    {
+        .name = "LED",
+        .pin = LED0_PIN,
+        .mode = GPIO_OUT
+    },
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GPIO_PARAMS_H */
+/** @} */