samr21-xpro: initial import for the samr21-xpro board

boards/samr21-xpro/Makefile

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+# tell the Makefile.base which module to build
+MODULE = $(BOARD)_base
+
+
+include $(RIOTBASE)/Makefile.base

boards/samr21-xpro/Makefile.include

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+# define the cpu used by the arduino due board
+export CPU = samd21
+export CPU_MODEL = samr21g18a
+
+# set the default port
+export PORT ?= /dev/ttyACM0
+
+# define tools used for building the project
+export PREFIX = arm-none-eabi-
+export CC = $(PREFIX)gcc
+export AR = $(PREFIX)ar
+export AS = $(PREFIX)as
+export LINK = $(PREFIX)gcc
+export SIZE = $(PREFIX)size
+export OBJCOPY = $(PREFIX)objcopy
+export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm -p
+export FLASHER = $(RIOTBOARD)/$(BOARD)/dist/flash.sh
+export DEBUGGER = $(RIOTBOARD)/$(BOARD)/dist/debug.sh
+
+# define build specific options
+export CPU_USAGE = -mcpu=cortex-m0plus
+FPU_USAGE =
+export CFLAGS += -ggdb -g3 -std=gnu99 -O0 -Wall -Wstrict-prototypes $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -mthumb -mthumb-interwork -nostartfiles
+export CFLAGS += -ffunction-sections -fdata-sections -fno-builtin
+export ASFLAGS += -ggdb -g3 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian
+export LINKFLAGS += -g3 -ggdb -std=gnu99 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -static -lgcc -mthumb -mthumb-interwork -nostartfiles
+# linkerscript specified in cpu/Makefile.include
+export LINKFLAGS += -T$(LINKERSCRIPT)
+export OFLAGS += -O binary
+export FFLAGS += $(HEXFILE)
+export TERMFLAGS += "$(PORT)"
+
+# use the nano-specs of the NewLib when available
+ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
+export LINKFLAGS += -specs=nano.specs -lc -lnosys
+endif
+
+# export board specific includes to the global includes-listing
+export INCLUDES += -I$(RIOTBOARD)/$(BOARD)/include

boards/samr21-xpro/board.c

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+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * 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     board_samr21-xpro
+ * @{
+ *
+ * @file        board.c
+ * @brief       Board specific implementations for the Atem SAM R21 Xplained Pro board
+ *
+ * @author      Thomas Eichinger <thomas.eichinger@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "board.h"
+#include "cpu.h"
+
+
+void led_init(void);
+
+
+void board_init(void)
+{
+    /* initialize the CPU */
+    cpu_init();
+
+    /* initialize the boards LEDs */
+    led_init();
+}
+
+
+/**
+ * @brief Initialize the boards on-board LED
+ *
+ * The LED initialization is hard-coded in this function. As the LED is soldered
+ * onto the board it is fixed to its CPU pins.
+ *
+ * The LED is connected to the following pin:
+ * - LED: PA19
+ */
+void led_init(void)
+{
+    LED_PORT.DIRSET.reg = LED_PIN;
+    LED_PORT.OUTSET.reg = LED_PIN;
+}

boards/samr21-xpro/dist/debug.sh

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+#!/bin/bash
+
+openocd -f "board/atmel_samr21_xplained_pro.cfg" \
+    -c "tcl_port 6333" \
+    -c "telnet_port 4444" \
+    -c "init" \
+    -c "targets" \
+    -c "reset halt"

boards/samr21-xpro/dist/flash.sh

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+#!/bin/bash
+
+openocd -f "board/atmel_samr21_xplained_pro.cfg" \
+    -c "init" \
+    -c "targets" \
+    -c "reset halt" \
+    -c "reset init" \
+    -c "flash write_image erase $1" \
+    -c "verify_image $1" \
+    -c "reset run" \
+    -c "shutdown"

boards/samr21-xpro/include/board.h

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+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup    board_samr21-xpro Atmel SAM R21 Xplained Pro
+ * @ingroup     boards
+ * @brief       Support for the Atmel SAM R21 Xplained Pro board.
+ * @{
+ *
+ * @file        board.h
+ * @brief       Board specific definitions for the Atmel SAM R21 Xplained Pro board.
+ *
+ * @author      Thomas Eichinger <thomas.eichinger@fu-berlin.de>
+ */
+
+#ifndef __BOARD_H
+#define __BOARD_H
+
+#include "cpu.h"
+
+/**
+ * Define the nominal CPU core clock in this board
+ */
+#define F_CPU               (48000000UL)
+
+/**
+ * Assign the hardware timer
+ */
+#define HW_TIMER            TIMER_0
+
+/**
+ * @name Define UART device and baudrate for stdio
+ * @{
+ */
+#define STDIO               UART_0
+#define STDIO_BAUDRATE      (115200U)
+#define STDIO_BUFSIZE       (64U)
+/** @} */
+
+/**
+ * @name LED pin definitions
+ * @{
+ */
+#define LED_PORT            PORT->Group[0]
+#define LED_PIN             PORT_PA19
+/** @} */
+
+/**
+ * @name Macros for controlling the on-board LEDs.
+ * @{
+ */
+#define LED_ON              (LED_PORT.OUTCLR.reg = LED_PIN)
+#define LED_OFF             (LED_PORT.OUTSET.reg = LED_PIN)
+#define LED_TOGGLE          (LED_PORT.OUTTGL.reg = LED_PIN)
+
+/* for compatability to other boards */
+#define LED_GREEN_ON        /* not available */
+#define LED_GREEN_OFF       /* not available */
+#define LED_GREEN_TOGGLE    /* not available */
+#define LED_ORANGE_ON       /* not available */
+#define LED_ORANGE_OFF      /* not available */
+#define LED_ORANGE_TOGGLE   /* not available */
+#define LED_RED_ON          LED_ON
+#define LED_RED_OFF         LED_OFF
+#define LED_RED_TOGGLE      LED_TOGGLE
+/** @} */
+
+/**
+ * @brief Initialize board specific hardware, including clock, LEDs and std-IO
+ */
+void board_init(void);
+
+#endif /** __BOARD_H */
+/** @} */

boards/samr21-xpro/include/periph_conf.h

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+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * 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     board_samr21-xpro
+ * @{
+ *
+ * @file        periph_conf.h
+ * @brief       Peripheral MCU configuration for the Atmel SAM R21 Xplained Pro board
+ *
+ * @author      Thomas Eichinger <thomas.eichinger@fu-berlin.de>
+ */
+
+#ifndef __PERIPH_CONF_H
+#define __PERIPH_CONF_H
+
+/**
+ * @name Timer peripheral configuration
+ * @{
+ */
+#define TIMER_NUMOF         (3U)
+#define TIMER_0_EN          1
+#define TIMER_1_EN          1
+#define TIMER_2_EN          1
+
+/* Timer 0 configuration */
+#define TIMER_0_DEV         TC3->COUNT16
+#define TIMER_0_CHANNELS    2
+#define TIMER_0_MAX_VALUE   (0xffff)
+#define TIMER_0_ISR         isr_tc3
+
+/* Timer 1 configuration */
+#define TIMER_1_DEV         TC4->COUNT16
+#define TIMER_1_CHANNELS    2
+#define TIMER_1_MAX_VALUE   (0xffff)
+#define TIMER_1_ISR         isr_tc4
+
+/* Timer 2 configuration */
+#define TIMER_2_DEV         TC5->COUNT16
+#define TIMER_2_CHANNELS    2
+#define TIMER_2_MAX_VALUE   (0xffff)
+#define TIMER_2_ISR         isr_tc5
+/** @} */
+
+
+/**
+ * @name UART configuration
+ * @{
+ */
+#define UART_NUMOF          (1U)
+#define UART_0_EN           1
+#define UART_1_EN           0
+#define UART_2_EN           0
+#define UART_3_EN           0
+#define UART_IRQ_PRIO       1
+
+/* UART 0 device configuration */
+#define UART_0_DEV          SERCOM0->USART
+#define UART_0_IRQ          SERCOM0_IRQn
+#define UART_0_ISR          isr_sercom0
+/* UART 0 pin configuration */
+#define UART_0_PORT         (PORT->Group[0])
+#define UART_0_TX_PIN       PIN_PA04
+#define UART_0_RX_PIN       PIN_PA05
+#define UART_0_PINS         (PORT_PA04 | PORT_PA05)
+#define UART_0_REF_F        (8000000UL)
+
+
+/* UART 1 device configuration */
+#define UART_1_DEV
+#define UART_1_IRQ
+#define UART_1_ISR
+/* UART 1 pin configuration */
+#define UART_1_PORT
+#define UART_1_PINS
+/** @} */
+
+/**
+ * @name Random Number Generator configuration
+ * @{
+ */
+#define RANDOM_NUMOF        (0U)
+/** @} */
+
+/**
+ * @name GPIO configuration
+ * @{
+ */
+#define GPIO_NUMOF          (4U)
+#define GPIO_0_EN           1
+#define GPIO_1_EN           1
+#define GPIO_2_EN           1
+#define GPIO_3_EN           1
+
+/* GPIO channel 0 config */
+#define GPIO_0_DEV          PORT->Group[0]
+#define GPIO_0_PIN          PIN_PA13
+#define GPIO_0_EXTINT		13
+/* GPIO channel 1 config */
+/* SW0 Button, configure w/ GPIO_PULLUP and GPIO_FALLING */
+#define GPIO_1_DEV          PORT->Group[0]
+#define GPIO_1_PIN          PIN_PA28
+#define GPIO_1_EXTINT		8
+/* GPIO channel 2 config */
+#define GPIO_2_DEV          PORT->Group[0]
+#define GPIO_2_PIN          PIN_PA15
+#define GPIO_2_EXTINT		15
+/* GPIO channel 3 config */
+#define GPIO_3_DEV          PORT->Group[0]
+#define GPIO_3_PIN          PIN_PA19
+#define GPIO_3_EXTINT       3
+/** @} */
+
+#endif /* __PERIPH_CONF_H */
+/** @} */