Added support for MKRZero

boards.txt

@@ -132,3 +132,32 @@ mkr1000.build.vid=0x2341
 mkr1000.build.pid=0x804e
 mkr1000.bootloader.tool=openocd
 mkr1000.bootloader.file=mkr1000/samd21_sam_ba_arduino_mkr1000.bin
+
+# Arduino MKRZero
+# ---------------
+mkrzero.name=Arduino MKRZero
+mkrzero.vid.0=0x2341
+mkrzero.pid.0=0x804f
+mkrzero.vid.1=0x2341
+mkrzero.pid.1=0x004f
+
+mkrzero.upload.tool=bossac
+mkrzero.upload.protocol=sam-ba
+mkrzero.upload.maximum_size=262144
+mkrzero.upload.use_1200bps_touch=true
+mkrzero.upload.wait_for_upload_port=true
+mkrzero.upload.native_usb=true
+mkrzero.build.mcu=cortex-m0plus
+mkrzero.build.f_cpu=48000000L
+mkrzero.build.usb_product="Arduino MKRZero"
+mkrzero.build.usb_manufacturer="Arduino LLC"
+mkrzero.build.board=SAMD_MKR1000
+mkrzero.build.core=arduino
+mkrzero.build.extra_flags=-D__SAMD21G18A__ {build.usb_flags}
+mkrzero.build.ldscript=linker_scripts/gcc/flash_with_bootloader.ld
+mkrzero.build.openocdscript=openocd_scripts/arduino_zero.cfg
+mkrzero.build.variant=mkrzero
+mkrzero.build.vid=0x2341
+mkrzero.build.pid=0x804f
+mkrzero.bootloader.tool=openocd
+mkrzero.bootloader.file=mkrzero/samd21_sam_ba_arduino_mkrzero.bin

bootloaders/mkrzero/samd21_sam_ba_arduino_mkrzero.hex

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+:10131000001C0042024B187E4007C00F7047C046B9
+:10132000001C004208B5FFF7F5FF0028FBD002487B
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+:10136000B44204D02078FFF7CBFF0134F8E7281C03
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+:101380000B0A5840034B4000C05A0902484080B243
+:101390007047C0460A170000F7B50024051C0F1C53
+:1013A000261CBC4220D0FFF7BDFF114BC0B21B78FA
+:1013B0000190002B1AD1311CFFF7E2FF0D4B061CE8
+:1013C0001A88002A04D10C4A11782A1C002907D057
+:1013D00001996A1C2970802F02D11988013919805E
+:1013E0000134A4B2151CDCE7301C00E00120FEBD76
+:1013F0001D0300209A0200201E030020F0B53E4E7F
+:1014000085B0002203900C1C32703C4B914201D1FC
+:10141000012201E03A490C801A707F231C4201D05E
+:1014200080349C43FFF77EFF3378C0B2002B07D097
+:1014300000253570FFF776FF3378C0B2AB4236D166
+:10144000432803D0712853D01528EBD101230093F2
+:101450000120FFF755FF0098FFF752FF0099802504
+:10146000C843C0B2FFF74CFF039B00270293244AF6
+:101470001388002B1DD1214901930978002918D127
+:101480000198FFF73DFF391C0198FFF779FF013DF7
+:10149000071C002DEBD1000AC0B2FFF731FFF8B2F4
+:1014A000FFF72EFFFFF73EFF3378002B0AD0357091
+:1014B0001FE00299013B09781380029B01910133DF
+:1014C0000293DDE7C0B2062807D1009B03990133E0
+:1014D000DBB280310093803C0391002CB8D1042012
+:1014E000FFF70EFFFFF71EFF044B01251C7000E005
+:1014F0000025281C05B0F0BD1D0300201E030020A0
+:101500009A020020F0B5384C87B000230190237078
+:10151000994201D1012301E0344A1180344A642602
+:1015200013704320FFF7ECFE324FFFF7F3FE002865
+:1015300003D1002F03D0013FF7E7002F03D1013E75
+:10154000002EEED14DE00125FFF7ECFE2378002BB5
+:1015500038D1C0B20290012805D004283DD1062020
+:10156000FFF7CEFE39E005AE0221301CFFF714FF75
+:1015700001988021FFF710FF23780390002B18D1EA
+:10158000FFF7D0FE0702FFF7CDFEBFB223783F186A
+:10159000BFB2012B0DD0039B9F4207D13378AB42E2
+:1015A00004D1EB437278DBB29A4204D01820FFF7E3
+:1015B000A7FE002303E00620FFF7A2FE029B22788D
+:1015C000002A02D0002626700BE0012B05D1019ADB
+:1015D0006B1C8032DDB20192B6E7054A002313701E
+:1015E0000126301C07B0F0BD1D0300209A02002028
+:1015F0001E03002000350C0010B50023934203D0D9
+:10160000CC5CC4540133F9E710BD031C821893422B
+:1016100002D019700133FAE770470023C25C01332E
+:10162000002AFBD1581E7047F8B5C046F8BC08BC6C
+:101630009E467047F8B5C046F8BC08BC9E46704749
+:101640000403090441726475696E6F204C4C4300B9
+:1016500041726475696E6F204D4B525A65726F000E
+:10166000120100020200004041234F00000201026B
+:101670000001000008000000100000002000000031
+:101680004000000080000000000100000002000097
+:1016900000040000011300002513000015130000D2
+:1016A0005913000073130000FD130000051500001E
+:1016B000760020004F637420323020323031360003
+:1016C00031353A32303A343700580A0D00590A0D94
+:1016D000005A00230A0D003E00322E3000000000A8
+:1016E000890B0000A50B0000C10B0000E50B0000FA
+:1016F000010C0000E50B0000290C00005B41726446
+:1017000075696E6F3A58595A5D00000021104220E9
+:1017100063308440A550C660E770088129914AA1D2
+:101720006BB18CC1ADD1CEE1EFF131121002733249
+:101730005222B5529442F772D662399318837BB322
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+:10179000A7784008611802282338CCC9EDD98EE912
+:1017A000AFF9488969990AA92BB9F55AD44AB77A89
+:1017B000966A711A500A333A122AFDDBDCCBBFFB62
+:1017C0009EEB799B588B3BBB1AABA66C877CE44C99
+:1017D000C55C222C033C600C411CAEED8FFDECCDB2
+:1017E000CDDD2AAD0BBD688D499D977EB66ED55E69
+:1017F000F44E133E322E511E700E9FFFBEEFDDDF02
+:10180000FCCF1BBF3AAF599F788F8891A981CAB18D
+:10181000EBA10CD12DC14EF16FE18010A100C230BF
+:10182000E3200450254046706760B9839893FBA37A
+:10183000DAB33DC31CD37FE35EF3B1029012F3220F
+:10184000D2323542145277625672EAB5CBA5A895CA
+:1018500089856EF54FE52CD50DC5E234C324A0145F
+:1018600081046674476424540544DBA7FAB799875A
+:10187000B8975FE77EF71DC73CD7D326F2369106AF
+:10188000B01657667676154634564CD96DC90EF9A2
+:101890002FE9C899E9898AB9ABA9445865480678FF
+:1018A0002768C018E1088238A3287DCB5CDB3FEBBA
+:1018B0001EFBF98BD89BBBAB9ABB754A545A376A4F
+:1018C000167AF10AD01AB32A923A2EFD0FED6CDD8A
+:1018D0004DCDAABD8BADE89DC98D267C076C645C9F
+:1018E000454CA23C832CE01CC10C1FEF3EFF5DCF9A
+:1018F0007CDF9BAFBABFD98FF89F176E367E554EEF
+:10190000745E932EB23ED10EF01E00000000000067
+:1019100001140000090243000201008032090400A2
+:101920000001020200000524001001042402000549
+:10193000240600010524010001070583030800FFB8
+:1019400009040100020A00000007058102400000AE
+:10195000070502024000000000C20100000008006C
+:0C196000690000004100000000000000D1
+:040000030000064DA6
+:00000001FF

bootloaders/zero/board_definitions.h

@@ -25,6 +25,8 @@
   #include "board_definitions_arduino_mkr1000.h"
 #elif defined(BOARD_ID_genuino_mkr1000)
   #include "board_definitions_genuino_mkr1000.h"
+#elif defined(BOARD_ID_arduino_mkrzero)
+  #include "board_definitions_arduino_mkrzero.h"
 #else
   #error You must define a BOARD_ID and add the corresponding definitions in board_definitions.h
 #endif

bootloaders/zero/board_definitions_arduino_mkrzero.h

+/*
+  Copyright (c) 2016 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BOARD_DEFINITIONS_H_
+#define _BOARD_DEFINITIONS_H_
+
+/*
+ * USB device definitions
+ */
+#define STRING_PRODUCT "Arduino MKRZero"
+#define USB_VID_HIGH   0x23
+#define USB_VID_LOW    0x41
+#define USB_PID_HIGH   0x00
+#define USB_PID_LOW    0x4F
+
+/*
+ * If BOOT_DOUBLE_TAP_ADDRESS is defined the bootloader is started by
+ * quickly tapping two times on the reset button.
+ * BOOT_DOUBLE_TAP_ADDRESS must point to a free SRAM cell that must not
+ * be touched from the loaded application.
+ */
+#define BOOT_DOUBLE_TAP_ADDRESS           (0x20007FFCul)
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *) BOOT_DOUBLE_TAP_ADDRESS))
+
+/*
+ * If BOOT_LOAD_PIN is defined the bootloader is started if the selected
+ * pin is tied LOW.
+ */
+//#define BOOT_LOAD_PIN                     PIN_PA21
+//#define BOOT_LOAD_PIN                     PIN_PA15
+
+#define BOOT_USART_MODULE                 SERCOM5
+#define BOOT_USART_BUS_CLOCK_INDEX        PM_APBCMASK_SERCOM5
+#define BOOT_USART_PER_CLOCK_INDEX        GCLK_CLKCTRL_ID_SERCOM5_CORE_Val
+#define BOOT_USART_PAD_SETTINGS           UART_RX_PAD3_TX_PAD2
+#define BOOT_USART_PAD3                   PINMUX_PB23D_SERCOM5_PAD3
+#define BOOT_USART_PAD2                   PINMUX_PB22D_SERCOM5_PAD2
+#define BOOT_USART_PAD1                   PINMUX_UNUSED
+#define BOOT_USART_PAD0                   PINMUX_UNUSED
+
+/* Master clock frequency */
+#define CPU_FREQUENCY                     (48000000ul)
+#define VARIANT_MCK                       CPU_FREQUENCY
+
+/* Frequency of the board main oscillator */
+#define VARIANT_MAINOSC                   (32768ul)
+
+/* Calibration values for DFLL48 pll */
+#define NVM_SW_CALIB_DFLL48M_COARSE_VAL   (58)
+#define NVM_SW_CALIB_DFLL48M_FINE_VAL     (64)
+
+/*
+ * LEDs definitions
+ */
+// PB08 (digital pin 32)
+#define BOARD_LED_PORT                    (1)
+#define BOARD_LED_PIN                     (8)
+
+// No RX/TX led
+//#define BOARD_LEDRX_PORT
+//#define BOARD_LEDRX_PIN
+
+//#define BOARD_LEDTX_PORT
+//#define BOARD_LEDTX_PIN
+
+#endif // _BOARD_DEFINITIONS_H_

bootloaders/zero/build_all_bootloaders.sh

@@ -10,5 +10,8 @@ mv -v samd21_sam_ba_arduino_mkr1000.* ../mkr1000/
 BOARD_ID=genuino_mkr1000 NAME=samd21_sam_ba_genuino_mkr1000 make clean all
 mv -v samd21_sam_ba_genuino_mkr1000.* ../mkr1000/
 
+BOARD_ID=arduino_mkrzero NAME=samd21_sam_ba_arduino_mkrzero make clean all
+mv -v samd21_sam_ba_arduino_mkrzero.* ../mkrzero/
+
 echo Done building bootloaders!
 

variants/mkrzero/debug_scripts/variant.gdb

+#
+#  Arduino Zero OpenOCD script.
+#
+#  Copyright (c) 2014-2015 Arduino LLC. All right reserved.
+#
+#  This library is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2.1 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#  See the GNU Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+# Define 'reset' command
+define reset
+
+info reg
+
+break main
+
+# End of 'reset' command
+end
+
+target remote | openocd -c "interface cmsis-dap" -c "set CHIPNAME at91samd21g18" -f target/at91samdXX.cfg -c "gdb_port pipe; log_output openocd.log"

variants/mkrzero/linker_scripts/gcc/flash_with_bootloader.ld

+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/* Linker script to configure memory regions.
+ * Need modifying for a specific board.
+ *   FLASH.ORIGIN: starting address of flash
+ *   FLASH.LENGTH: length of flash
+ *   RAM.ORIGIN: starting address of RAM bank 0
+ *   RAM.LENGTH: length of RAM bank 0
+ */
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x00000000+0x2000, LENGTH = 0x00040000-0x2000 /* First 8KB used by bootloader */
+  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00008000
+}
+
+/* Linker script to place sections and symbol values. Should be used together
+ * with other linker script that defines memory regions FLASH and RAM.
+ * It references following symbols, which must be defined in code:
+ *   Reset_Handler : Entry of reset handler
+ *
+ * It defines following symbols, which code can use without definition:
+ *   __exidx_start
+ *   __exidx_end
+ *   __copy_table_start__
+ *   __copy_table_end__
+ *   __zero_table_start__
+ *   __zero_table_end__
+ *   __etext
+ *   __data_start__
+ *   __preinit_array_start
+ *   __preinit_array_end
+ *   __init_array_start
+ *   __init_array_end
+ *   __fini_array_start
+ *   __fini_array_end
+ *   __data_end__
+ *   __bss_start__
+ *   __bss_end__
+ *   __end__
+ *   end
+ *   __HeapLimit
+ *   __StackLimit
+ *   __StackTop
+ *   __stack
+ */
+ENTRY(Reset_Handler)
+
+SECTIONS
+{
+	.text :
+	{
+		KEEP(*(.isr_vector))
+		*(.text*)
+
+		KEEP(*(.init))
+		KEEP(*(.fini))
+
+		/* .ctors */
+		*crtbegin.o(.ctors)
+		*crtbegin?.o(.ctors)
+		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
+		*(SORT(.ctors.*))
+		*(.ctors)
+
+		/* .dtors */
+ 		*crtbegin.o(.dtors)
+ 		*crtbegin?.o(.dtors)
+ 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
+ 		*(SORT(.dtors.*))
+ 		*(.dtors)
+
+		*(.rodata*)
+
+		KEEP(*(.eh_frame*))
+	} > FLASH
+
+	.ARM.extab :
+	{
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
+	} > FLASH
+
+	__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > FLASH
+	__exidx_end = .;
+
+	/* To copy multiple ROM to RAM sections,
+	 * uncomment .copy.table section and,
+	 * define __STARTUP_COPY_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.copy.table :
+	{
+		. = ALIGN(4);
+		__copy_table_start__ = .;
+		LONG (__etext)
+		LONG (__data_start__)
+		LONG (__data_end__ - __data_start__)
+		LONG (__etext2)
+		LONG (__data2_start__)
+		LONG (__data2_end__ - __data2_start__)
+		__copy_table_end__ = .;
+	} > FLASH
+	*/
+
+	/* To clear multiple BSS sections,
+	 * uncomment .zero.table section and,
+	 * define __STARTUP_CLEAR_BSS_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.zero.table :
+	{
+		. = ALIGN(4);
+		__zero_table_start__ = .;
+		LONG (__bss_start__)
+		LONG (__bss_end__ - __bss_start__)
+		LONG (__bss2_start__)
+		LONG (__bss2_end__ - __bss2_start__)
+		__zero_table_end__ = .;
+	} > FLASH
+	*/
+
+	__etext = .;
+
+	.data : AT (__etext)
+	{
+		__data_start__ = .;
+		*(vtable)
+		*(.data*)
+
+		. = ALIGN(4);
+		/* preinit data */
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP(*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+
+		. = ALIGN(4);
+		/* init data */
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+
+
+		. = ALIGN(4);
+		/* finit data */
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+
+		KEEP(*(.jcr*))
+		. = ALIGN(4);
+		/* All data end */
+		__data_end__ = .;
+
+	} > RAM
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start__ = .;
+		*(.bss*)
+		*(COMMON)
+		. = ALIGN(4);
+		__bss_end__ = .;
+	} > RAM
+
+	.heap (COPY):
+	{
+		__end__ = .;
+		PROVIDE(end = .);
+		*(.heap*)
+		__HeapLimit = .;
+	} > RAM
+
+	/* .stack_dummy section doesn't contains any symbols. It is only
+	 * used for linker to calculate size of stack sections, and assign
+	 * values to stack symbols later */
+	.stack_dummy (COPY):
+	{
+		*(.stack*)
+	} > RAM
+
+	/* Set stack top to end of RAM, and stack limit move down by
+	 * size of stack_dummy section */
+	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
+	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
+	PROVIDE(__stack = __StackTop);
+
+	__ram_end__ = ORIGIN(RAM) + LENGTH(RAM) -1 ;
+
+	/* Check if data + heap + stack exceeds RAM limit */
+	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+}

variants/mkrzero/linker_scripts/gcc/flash_without_bootloader.ld

+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/* Linker script to configure memory regions.
+ * Need modifying for a specific board.
+ *   FLASH.ORIGIN: starting address of flash
+ *   FLASH.LENGTH: length of flash
+ *   RAM.ORIGIN: starting address of RAM bank 0
+ *   RAM.LENGTH: length of RAM bank 0
+ */
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x00040000
+  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00008000
+}
+
+/* Linker script to place sections and symbol values. Should be used together
+ * with other linker script that defines memory regions FLASH and RAM.
+ * It references following symbols, which must be defined in code:
+ *   Reset_Handler : Entry of reset handler
+ *
+ * It defines following symbols, which code can use without definition:
+ *   __exidx_start
+ *   __exidx_end
+ *   __copy_table_start__
+ *   __copy_table_end__
+ *   __zero_table_start__
+ *   __zero_table_end__
+ *   __etext
+ *   __data_start__
+ *   __preinit_array_start
+ *   __preinit_array_end
+ *   __init_array_start
+ *   __init_array_end
+ *   __fini_array_start
+ *   __fini_array_end
+ *   __data_end__
+ *   __bss_start__
+ *   __bss_end__
+ *   __end__
+ *   end
+ *   __HeapLimit
+ *   __StackLimit
+ *   __StackTop
+ *   __stack
+ *   __ram_end__
+ */
+ENTRY(Reset_Handler)
+
+SECTIONS
+{
+	.text :
+	{
+		KEEP(*(.isr_vector))
+		*(.text*)
+
+		KEEP(*(.init))
+		KEEP(*(.fini))
+
+		/* .ctors */
+		*crtbegin.o(.ctors)
+		*crtbegin?.o(.ctors)
+		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
+		*(SORT(.ctors.*))
+		*(.ctors)
+
+		/* .dtors */
+ 		*crtbegin.o(.dtors)
+ 		*crtbegin?.o(.dtors)
+ 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
+ 		*(SORT(.dtors.*))
+ 		*(.dtors)
+
+		*(.rodata*)
+
+		KEEP(*(.eh_frame*))
+	} > FLASH
+
+	.ARM.extab :
+	{
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
+	} > FLASH
+
+	__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > FLASH
+	__exidx_end = .;
+
+	/* To copy multiple ROM to RAM sections,
+	 * uncomment .copy.table section and,
+	 * define __STARTUP_COPY_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.copy.table :
+	{
+		. = ALIGN(4);
+		__copy_table_start__ = .;
+		LONG (__etext)
+		LONG (__data_start__)
+		LONG (__data_end__ - __data_start__)
+		LONG (__etext2)
+		LONG (__data2_start__)
+		LONG (__data2_end__ - __data2_start__)
+		__copy_table_end__ = .;
+	} > FLASH
+	*/
+
+	/* To clear multiple BSS sections,
+	 * uncomment .zero.table section and,
+	 * define __STARTUP_CLEAR_BSS_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.zero.table :
+	{
+		. = ALIGN(4);
+		__zero_table_start__ = .;
+		LONG (__bss_start__)
+		LONG (__bss_end__ - __bss_start__)
+		LONG (__bss2_start__)
+		LONG (__bss2_end__ - __bss2_start__)
+		__zero_table_end__ = .;
+	} > FLASH
+	*/
+
+	__etext = .;
+
+	.data : AT (__etext)
+	{
+		__data_start__ = .;
+		*(vtable)
+		*(.data*)
+
+		. = ALIGN(4);
+		/* preinit data */
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP(*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+
+		. = ALIGN(4);
+		/* init data */
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+
+
+		. = ALIGN(4);
+		/* finit data */
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+
+		KEEP(*(.jcr*))
+		. = ALIGN(4);
+		/* All data end */
+		__data_end__ = .;
+
+	} > RAM
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start__ = .;
+		*(.bss*)
+		*(COMMON)
+		. = ALIGN(4);
+		__bss_end__ = .;
+	} > RAM
+
+	.heap (COPY):
+	{
+		__end__ = .;
+		PROVIDE(end = .);
+		*(.heap*)
+		__HeapLimit = .;
+	} > RAM
+
+	/* .stack_dummy section doesn't contains any symbols. It is only
+	 * used for linker to calculate size of stack sections, and assign
+	 * values to stack symbols later */
+	.stack_dummy (COPY):
+	{
+		*(.stack*)
+	} > RAM
+
+	/* Set stack top to end of RAM, and stack limit move down by
+	 * size of stack_dummy section */
+	__StackTop = ORIGIN(RAM) + LENGTH(RAM) ;
+	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
+	PROVIDE(__stack = __StackTop);
+
+	__ram_end__ = ORIGIN(RAM) + LENGTH(RAM) -1 ;
+
+	/* Check if data + heap + stack exceeds RAM limit */
+	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+}

variants/mkrzero/openocd_scripts/arduino_zero.cfg

+#
+#  Arduino Zero OpenOCD script.
+#
+#  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+#
+#  This library is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2.1 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#  See the GNU Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+source [find interface/cmsis-dap.cfg]
+
+# chip name
+set CHIPNAME at91samd21g18
+set ENDIAN little
+
+# choose a port here
+set telnet_port 0
+
+source [find target/at91samdXX.cfg]

variants/mkrzero/pins_arduino.h

+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+// API compatibility
+#include "variant.h"
+

variants/mkrzero/variant.cpp

+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "variant.h"
+
+const PinDescription g_APinDescription[] = {
+
+/*
+ +------------+------------------+--------+-----------------+--------+-----------------------+---------+---------+--------+--------+----------+----------+
+ | Pin number |  MKR  Board pin  |  PIN   | Notes           | Peri.A |     Peripheral B      | Perip.C | Perip.D | Peri.E | Peri.F | Periph.G | Periph.H |
+ |            |                  |        |                 |   EIC  | ADC |  AC | PTC | DAC | SERCOMx | SERCOMx |  TCCx  |  TCCx  |    COM   | AC/GLCK  |
+ |            |                  |        |                 |(EXTINT)|(AIN)|(AIN)|     |     | (x/PAD) | (x/PAD) | (x/WO) | (x/WO) |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ | 00         | D0               |  PA22  |                 |  *06   |     |     | X10 |     |   3/00  |   5/00  |* TC4/0 | TCC0/4 |          | GCLK_IO6 |
+ | 01         | D1               |  PA23  |                 |  *07   |     |     | X11 |     |   3/01  |   5/01  |* TC4/1 | TCC0/5 | USB/SOF  | GCLK_IO7 |
+ | 02         | D2               |  PA10  |                 |   10   | *18 |     | X02 |     |   0/02  |   2/02  |*TCC1/0 | TCC0/2 | I2S/SCK0 | GCLK_IO4 |
+ | 03         | D3               |  PA11  |                 |   11   | *19 |     | X03 |     |   0/03  |   2/03  |*TCC1/1 | TCC0/3 | I2S/FS0  | GCLK_IO5 |
+ | 04         | D4               |  PB10  |                 |  *10   |     |     |     |     |         |   4/02  |* TC5/0 | TCC0/4 | I2S/MCK1 | GCLK_IO4 |
+ | 05         | D5               |  PB11  |                 |  *11   |     |     |     |     |         |   4/03  |* TC5/1 | TCC0/5 | I2S/SCK1 | GCLK_IO5 |
+ | 06         | D6               |  PA20  |                 |  *04   |     |     | X08 |     |   5/02  |   3/02  |        |*TCC0/6 | I2S/SCK0 | GCLK_IO4 |
+ | 07         | D7               |  PA21  |                 |  *05   |     |     | X09 |     |   5/03  |   3/03  |        |*TCC0/7 | I2S/FS0  | GCLK_IO5 |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ */
+  { PORTA, 22, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM4_CH0,   TC4_CH0,      EXTERNAL_INT_6    },
+  { PORTA, 23, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM4_CH1,   TC4_CH1,      EXTERNAL_INT_7    },
+  { PORTA, 10, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel18,  PWM1_CH0,   TCC1_CH0,     EXTERNAL_INT_NONE },
+  { PORTA, 11, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel19,  PWM1_CH1,   TCC1_CH1,     EXTERNAL_INT_NONE },
+  { PORTB, 10, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM5_CH0,   TC5_CH0,      EXTERNAL_INT_10   },
+  { PORTB, 11, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM5_CH1,   TC5_CH1,      EXTERNAL_INT_11   },
+  { PORTA, 20, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), No_ADC_Channel, PWM0_CH6,   TCC0_CH6,     EXTERNAL_INT_4    },
+  { PORTA, 21, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), No_ADC_Channel, PWM0_CH7,   TCC0_CH7,     EXTERNAL_INT_5    },
+
+/*
+ +------------+------------------+--------+-----------------+--------+-----------------------+---------+---------+--------+--------+----------+----------+
+ | Pin number |  MKR  Board pin  |  PIN   | Notes           | Peri.A |     Peripheral B      | Perip.C | Perip.D | Peri.E | Peri.F | Periph.G | Periph.H |
+ |            |                  |        |                 |   EIC  | ADC |  AC | PTC | DAC | SERCOMx | SERCOMx |  TCCx  |  TCCx  |    COM   | AC/GLCK  |
+ |            |                  |        |                 |(EXTINT)|(AIN)|(AIN)|     |     | (x/PAD) | (x/PAD) | (x/WO) | (x/WO) |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ |            |       SPI        |        |                 |        |     |     |     |     |         |         |        |        |          |          |
+ | 08         | MOSI             |  PA16  |                 |  *00   |     |     | X04 |     |  *1/00  |   3/00  |*TCC2/0 | TCC0/6 |          | GCLK_IO2 |
+ | 09         | SCK              |  PA17  |                 |  *01   |     |     | X05 |     |  *1/01  |   3/01  | TCC2/1 | TCC0/7 |          | GCLK_IO3 |
+ | 10         | MISO             |  PA19  |                 |   03   |     |     | X07 |     |  *1/03  |   3/03  |* TC3/1 | TCC0/3 | I2S/SD0  | AC/CMP1  |
+ +------------+------------------+--------+-----------------+--------------------+-----+-----+---------+---------+--------+--------+----------+----------+
+ |            |       Wire       |        |                 |        |     |     |     |     |         |         |        |        |          |          |
+ | 11         | SDA              |  PA08  |                 |   NMI  | *16 |     | X00 |     |  *0/00  |   2/00  | TCC0/0 | TCC1/2 | I2S/SD1  |          |
+ | 12         | SCL              |  PA09  |                 |   09   | *17 |     | X01 |     |  *0/01  |   2/01  | TCC0/1 | TCC1/3 | I2S/MCK0 |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ |            |      Serial1     |        |                 |        |     |     |     |     |         |         |        |        |          |          |
+ | 13         | RX               |  PB23  |                 |   07   |     |     |     |     |         |  *5/03  |        |        |          | GCLK_IO1 |
+ | 14         | TX               |  PB22  |                 |   06   |     |     |     |     |         |  *5/02  |        |        |          | GCLK_IO0 |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ */
+                                                                                                                                               // DIPO=3 DOPO=0
+  { PORTA, 16, PIO_SERCOM,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM2_CH0,   TCC2_CH0,     EXTERNAL_INT_0    }, // MOSI: SERCOM1/PAD[0]
+  { PORTA, 17, PIO_SERCOM,  (PIN_ATTR_DIGITAL                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_1    }, // SCK:  SERCOM1/PAD[1]
+  { PORTA, 19, PIO_SERCOM,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM3_CH1,   TC3_CH1,      EXTERNAL_INT_NONE }, // MISO: SERCOM1/PAD[3]
+
+                                                                                                                                               // PINOUT=0
+  { PORTA,  8, PIO_SERCOM,  (PIN_ATTR_DIGITAL                                ), ADC_Channel16,  NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NMI  }, // SDA:  SERCOM0/PAD[0]
+  { PORTA,  9, PIO_SERCOM,  (PIN_ATTR_DIGITAL                                ), ADC_Channel17,  NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // SCL:  SERCOM0/PAD[1]
+
+                                                                                                                                               // RXPO=3 TXPO=1
+  { PORTB, 23, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL                             ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // RX:   SERCOM5/PAD[3]
+  { PORTB, 22, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL                             ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // TX:   SERCOM5/PAD[2]
+
+
+/*
+ +------------+------------------+--------+-----------------+--------+-----------------------+---------+---------+--------+--------+----------+----------+
+ | Pin number |  MKR  Board pin  |  PIN   | Notes           | Peri.A |     Peripheral B      | Perip.C | Perip.D | Peri.E | Peri.F | Periph.G | Periph.H |
+ |            |                  |        |                 |   EIC  | ADC |  AC | PTC | DAC | SERCOMx | SERCOMx |  TCCx  |  TCCx  |    COM   | AC/GLCK  |
+ |            |                  |        |                 |(EXTINT)|(AIN)|(AIN)|     |     | (x/PAD) | (x/PAD) | (x/WO) | (x/WO) |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ | 15         | A0 / DAC0        |  PA02  |                 |   02   | *00 |     | Y00 | OUT |         |         |        |        |          |          |
+ | 16         | A1               |  PB02  |                 |  *02   | *10 |     | Y08 |     |         |   5/00  |        |        |          |          |
+ | 17         | A2               |  PB03  |                 |  *03   | *11 |     | Y09 |     |         |   5/01  |        |        |          |          |
+ | 18         | A3               |  PA04  |                 |   04   | *04 |  00 | Y02 |     |         |   0/00  |*TCC0/0 |        |          |          |
+ | 19         | A4               |  PA05  |                 |   05   | *05 |  01 | Y03 |     |         |   0/01  |*TCC0/1 |        |          |          |
+ | 20         | A5               |  PA06  |                 |   06   | *06 |  02 | Y04 |     |         |   0/02  | TCC1/0 |        |          |          |
+ | 21         | A6               |  PA07  |                 |   07   | *07 |  03 | Y05 |     |         |   0/03  | TCC1/1 |        | I2S/SD0  |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ */
+  { PORTA,  2, PIO_ANALOG,  (PIN_ATTR_DIGITAL|PIN_ATTR_ANALOG /*DAC*/        ), ADC_Channel0,   NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+  { PORTB,  2, PIO_ANALOG,  (PIN_ATTR_DIGITAL                                ), ADC_Channel10,  NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_2    },
+  { PORTB,  3, PIO_ANALOG,  (PIN_ATTR_DIGITAL                                ), ADC_Channel11,  NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_3    },
+  { PORTA,  4, PIO_ANALOG,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel4,   PWM0_CH0,   TCC0_CH0,     EXTERNAL_INT_NONE },
+  { PORTA,  5, PIO_ANALOG,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel5,   PWM0_CH1,   TCC0_CH1,     EXTERNAL_INT_NONE },
+  { PORTA,  6, PIO_ANALOG,  (PIN_ATTR_DIGITAL                                ), ADC_Channel6,   NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+  { PORTA,  7, PIO_ANALOG,  (PIN_ATTR_DIGITAL                                ), ADC_Channel7,   NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+
+/*
+ +------------+------------------+--------+-----------------+--------+-----------------------+---------+---------+--------+--------+----------+----------+
+ | Pin number |  MKR  Board pin  |  PIN   | Notes           | Peri.A |     Peripheral B      | Perip.C | Perip.D | Peri.E | Peri.F | Periph.G | Periph.H |
+ |            |                  |        |                 |   EIC  | ADC |  AC | PTC | DAC | SERCOMx | SERCOMx |  TCCx  |  TCCx  |    COM   | AC/GLCK  |
+ |            |                  |        |                 |(EXTINT)|(AIN)|(AIN)|     |     | (x/PAD) | (x/PAD) | (x/WO) | (x/WO) |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ |            |       USB        |        |                 |        |     |     |     |     |         |         |        |        |          |          |
+ | 22         |                  |  PA24  | USB N           |   12   |     |     |     |     |   3/02  |   5/02  |  TC5/0 | TCC1/2 | USB/DM   |          |
+ | 23         |                  |  PA25  | USB P           |   13   |     |     |     |     |   3/03  |   5/03  |  TC5/1 | TCC1/3 | USB/DP   |          |
+ | 24         |                  |  PA18  | USB ID          |   02   |     |     | X06 |     |   1/02  |   3/02  |  TC3/0 | TCC0/2 |          | AC/CMP0  |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ | 25         | AREF             |  PA03  |                 |   03   |  01 |     | Y01 |     |         |         |        |        |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ */
+  { PORTA, 24, PIO_COM,     (PIN_ATTR_NONE                                   ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // USB/DM
+  { PORTA, 25, PIO_COM,     (PIN_ATTR_NONE                                   ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // USB/DP
+  { PORTA, 18, PIO_DIGITAL, (PIN_ATTR_DIGITAL                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+
+  { PORTA,  3, PIO_DIGITAL, (PIN_ATTR_DIGITAL                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // DAC/VREFP
+
+/*
+ +------------+------------------+--------+-----------------+--------+-----------------------+---------+---------+--------+--------+----------+----------+
+ | Pin number |  MKR  Board pin  |  PIN   | Notes           | Peri.A |     Peripheral B      | Perip.C | Perip.D | Peri.E | Peri.F | Periph.G | Periph.H |
+ |            |                  |        |                 |   EIC  | ADC |  AC | PTC | DAC | SERCOMx | SERCOMx |  TCCx  |  TCCx  |    COM   | AC/GLCK  |
+ |            |                  |        |                 |(EXTINT)|(AIN)|(AIN)|     |     | (x/PAD) | (x/PAD) | (x/WO) | (x/WO) |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ |            | SD SPI 					 |        |                 |        |     |     |     |     |         |         |        |        |          |          |
+ | 26         |                  |  PA12  | SD SCK		      |   12   |     |     |     |     |  *2/00  |   4/00  | TCC2/0 | TCC0/6 |          | AC/CMP0  |
+ | 27         |                  |  PA13  | SD MOSI         |   13   |     |     |     |     |  *2/01  |   4/01  | TCC2/1 | TCC0/7 |          | AC/CMP1  |
+ | 28         |                  |  PA14  | SD SS		        |   14   |     |     |     |     |   2/02  |   4/02  |  TC3/0 | TCC0/4 |          | GCLK_IO0 |
+ | 29         |                  |  PA15  | SD MISO         |   15   |     |     |     |     |  *2/03  |   4/03  |  TC3/1 | TCC0/5 |          | GCLK_IO1 |
+ | 30         |                  |  PA27  | SD CD	 					|   15   |     |     |     |     |         |         |        |        |          | GCLK_IO0 |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ | 31         |                  |  PA28  | BOTTOM PAD	    |   08   |     |     |     |     |         |         |        |        |          | GCLK_IO0 |
+ | 32         |                  |  PB08  | LED_BUILTIN	    |   08   |  02 |     | Y14 |     |         |   4/00  |  TC4/0 |        |          |          |
+ | 33         |                  |  PB09  | ADC_BATTERY     |  *09   |  03 |     | Y15 |     |         |   4/01  |  TC4/1 |        |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ |            | 32768Hz Crystal  |        |                 |        |     |     |     |     |         |         |        |        |          |          |
+ | 34         |                  |  PA00  | XIN32           |   00   |     |     |     |     |         |   1/00  | TCC2/0 |        |          |          |
+ | 35         |                  |  PA01  | XOUT32          |   01   |     |     |     |     |         |   1/01  | TCC2/1 |        |          |          |
+ +------------+------------------+--------+-----------------+--------+-----+-----+-----+-----+---------+---------+--------+--------+----------+----------+
+ */
+                                                                                                                                               // DIPO=3 DOPO=0
+  { PORTA, 12, PIO_SERCOM,     (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // MOSI: SERCOM2/PAD[0]
+  { PORTA, 13, PIO_SERCOM,     (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // SCK:  SERCOM2/PAD[1]
+  { PORTA, 14, PIO_DIGITAL,    (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // SS:   as GPIO
+  { PORTA, 15, PIO_SERCOM,     (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // MISO: SERCOM2/PAD[3]
+  { PORTA, 27, PIO_DIGITAL,    (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+  
+  { PORTA, 28, PIO_DIGITAL,    (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+  { PORTB,  8, PIO_DIGITAL,    (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+  { PORTB,  9, PIO_ANALOG, (PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel3, PWM4_CH1, TC4_CH1, EXTERNAL_INT_9 },
+
+  { PORTA,  0, PIO_DIGITAL,    (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+  { PORTA,  1, PIO_DIGITAL,    (PIN_ATTR_NONE                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
+};
+
+const void* g_apTCInstances[TCC_INST_NUM + TC_INST_NUM]={ TCC0, TCC1, TCC2, TC3, TC4, TC5 };
+
+// Multi-serial objects instantiation
+SERCOM sercom0(SERCOM0);
+SERCOM sercom1(SERCOM1);
+SERCOM sercom2(SERCOM2);
+SERCOM sercom3(SERCOM3);
+SERCOM sercom4(SERCOM4);
+SERCOM sercom5(SERCOM5);
+
+// Serial1
+Uart Serial1(&sercom5, PIN_SERIAL1_RX, PIN_SERIAL1_TX, PAD_SERIAL1_RX, PAD_SERIAL1_TX);
+
+void SERCOM5_Handler()
+{
+  Serial1.IrqHandler();
+}
+

variants/mkrzero/variant.h

+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#pragma once
+
+// The definitions here needs a SAMD core >=1.6.3
+#define ARDUINO_SAMD_VARIANT_COMPLIANCE 10603
+
+#include <WVariant.h>
+
+// General definitions
+// -------------------
+
+// Frequency of the board main oscillator
+#define VARIANT_MAINOSC (32768ul)
+
+// Master clock frequency
+#define VARIANT_MCK     (48000000ul)
+
+// Pins
+// ----
+
+// Number of pins defined in PinDescription array
+#define PINS_COUNT           (26u)
+#define NUM_DIGITAL_PINS     (15u)
+#define NUM_ANALOG_INPUTS    (7u)
+#define NUM_ANALOG_OUTPUTS   (1u)
+
+// Low-level pin register query macros
+// -----------------------------------
+#define digitalPinToPort(P)      (&(PORT->Group[g_APinDescription[P].ulPort]))
+#define digitalPinToBitMask(P)   (1 << g_APinDescription[P].ulPin)
+//#define analogInPinToBit(P)    ()
+#define portOutputRegister(port) (&(port->OUT.reg))
+#define portInputRegister(port)  (&(port->IN.reg))
+#define portModeRegister(port)   (&(port->DIR.reg))
+#define digitalPinHasPWM(P)      (g_APinDescription[P].ulPWMChannel != NOT_ON_PWM || g_APinDescription[P].ulTCChannel != NOT_ON_TIMER)
+#define digitalPinToInterrupt(P) (g_APinDescription[P].ulExtInt)
+
+/*
+ * digitalPinToTimer(..) is AVR-specific and is not defined for SAMD
+ * architecture. If you need to check if a pin supports PWM you must
+ * use digitalPinHasPWM(..).
+ *
+ * https://github.com/arduino/Arduino/issues/1833
+ */
+// #define digitalPinToTimer(P)
+
+//Battery
+#define ADC_BATTERY	(33u)
+
+// LEDs
+// ----
+#define PIN_LED     (32u)
+#define LED_BUILTIN PIN_LED
+
+// Analog pins
+// -----------
+#define PIN_A0 (15u)
+#define PIN_A1 (16u)
+#define PIN_A2 (17u)
+#define PIN_A3 (18u)
+#define PIN_A4 (19u)
+#define PIN_A5 (20u)
+#define PIN_A6 (21u)
+static const uint8_t A0  = PIN_A0;
+static const uint8_t A1  = PIN_A1;
+static const uint8_t A2  = PIN_A2;
+static const uint8_t A3  = PIN_A3;
+static const uint8_t A4  = PIN_A4;
+static const uint8_t A5  = PIN_A5;
+static const uint8_t A6  = PIN_A6;
+#define ADC_RESOLUTION 12
+
+// SPI Interfaces
+// --------------
+#define SPI_INTERFACES_COUNT 2
+ 
+// SPI
+#define PIN_SPI_MISO  (10u)
+#define PIN_SPI_MOSI  (8u)
+#define PIN_SPI_SCK   (9u)
+#define PIN_SPI_SS    (4u)
+#define PERIPH_SPI    sercom1
+#define PAD_SPI_TX    SPI_PAD_0_SCK_1
+#define PAD_SPI_RX    SERCOM_RX_PAD_3
+
+static const uint8_t SS   = PIN_SPI_SS;   // SPI Slave SS not used. Set here only for reference.
+static const uint8_t MOSI = PIN_SPI_MOSI;
+static const uint8_t MISO = PIN_SPI_MISO;
+static const uint8_t SCK  = PIN_SPI_SCK;
+
+// SPI1: Connected to SD
+#define USE_SPI1
+#define PIN_SPI1_MISO (29u)
+#define PIN_SPI1_MOSI (26u)
+#define PIN_SPI1_SCK  (27u)
+#define PIN_SPI1_SS   (28u)
+#define PERIPH_SPI1   sercom2
+#define PAD_SPI1_TX   SPI_PAD_0_SCK_1
+#define PAD_SPI1_RX   SERCOM_RX_PAD_3
+static const uint8_t SS1   = PIN_SPI1_SS;
+static const uint8_t MOSI1 = PIN_SPI1_MOSI;
+static const uint8_t MISO1 = PIN_SPI1_MISO;
+static const uint8_t SCK1  = PIN_SPI1_SCK;
+
+// Wire Interfaces
+// ---------------
+#define WIRE_INTERFACES_COUNT 1
+
+// Wire
+#define PIN_WIRE_SDA        (11u)
+#define PIN_WIRE_SCL        (12u)
+#define PERIPH_WIRE         sercom0
+#define WIRE_IT_HANDLER     SERCOM0_Handler
+
+// USB
+// ---
+#define PIN_USB_DM          (22ul)
+#define PIN_USB_DP          (23ul)
+#define PIN_USB_HOST_ENABLE (24ul)
+
+// Serial ports
+// ------------
+#ifdef __cplusplus
+#include "SERCOM.h"
+#include "Uart.h"
+
+// Instances of SERCOM
+extern SERCOM sercom0;
+extern SERCOM sercom1;
+extern SERCOM sercom2;
+extern SERCOM sercom3;
+extern SERCOM sercom4;
+extern SERCOM sercom5;
+
+// Serial1
+extern Uart Serial1;
+#define PIN_SERIAL1_RX (13ul)
+#define PIN_SERIAL1_TX (14ul)
+#define PAD_SERIAL1_TX (UART_TX_PAD_2)
+#define PAD_SERIAL1_RX (SERCOM_RX_PAD_3)
+#endif // __cplusplus
+
+// These serial port names are intended to allow libraries and architecture-neutral
+// sketches to automatically default to the correct port name for a particular type
+// of use.  For example, a GPS module would normally connect to SERIAL_PORT_HARDWARE_OPEN,
+// the first hardware serial port whose RX/TX pins are not dedicated to another use.
+//
+// SERIAL_PORT_MONITOR        Port which normally prints to the Arduino Serial Monitor
+//
+// SERIAL_PORT_USBVIRTUAL     Port which is USB virtual serial
+//
+// SERIAL_PORT_LINUXBRIDGE    Port which connects to a Linux system via Bridge library
+//
+// SERIAL_PORT_HARDWARE       Hardware serial port, physical RX & TX pins.
+//
+// SERIAL_PORT_HARDWARE_OPEN  Hardware serial ports which are open for use.  Their RX & TX
+//                            pins are NOT connected to anything by default.
+#define SERIAL_PORT_USBVIRTUAL      SerialUSB
+#define SERIAL_PORT_MONITOR         SerialUSB
+#define SERIAL_PORT_HARDWARE        Serial1
+#define SERIAL_PORT_HARDWARE_OPEN   Serial1
+
+// Alias Serial to SerialUSB
+#define Serial                      SerialUSB
+