Burn Bootloader and upload a program for CC-samd21g Breakout Board

First of all

You will need the following items for this instruction.

ATEML-ICE
FTDI BREAKOUT BOARD(3.3V)
reprogramming cable(you should assebele it.)

Software Setup

To import the CC-samd21g Breakout Board, add the following text in the 'boards.txt' file, located in the following directory:

# CC-SAMD21G (Serial Port)
# ---------------------------------------
cc-samd21g.name=CC-SAMD21G (Serial Port)
cc-samd21g.upload.tool=bossac
cc-samd21g.upload.protocol=sam-ba
cc-samd21g.upload.maximum_size=262144
cc-samd21g.upload.use_1200bps_touch=false
cc-samd21g.upload.wait_for_upload_port=false
cc-samd21g.upload.native_usb=true
cc-samd21g.build.mcu=cortex-m0plus
cc-samd21g.build.f_cpu=48000000L
cc-samd21g.build.usb_product="CC-SAMD21G"
cc-samd21g.build.usb_manufacturer=""
cc-samd21g.build.board=SAMD_ZERO
cc-samd21g.build.core=arduino
cc-samd21g.build.extra_flags=-D__SAMD21G18A__ {build.usb_flags}
cc-samd21g.build.ldscript=linker_scripts/gcc/flash_with_bootloader.ld
cc-samd21g.build.openocdscript=openocd_scripts/arduino_zero.cfg
cc-samd21g.build.variant=arduino_zero
cc-samd21g.build.variant_system_lib=
cc-samd21g.build.vid=0x0000
cc-samd21g.build.pid=0x0000
cc-samd21g.bootloader.tool=openocd
cc-samd21g.bootloader.file=cc/samd21_sam_ba_cc.bin

* C:\Users\(username)\AppData\Local\Arduino15\packages\arduino\hardware\samd\1.6.xx

And store custom bootloader for this board shown as below.

    ^\1.6.xx\bootloaders\cc\samd21_sam_ba_cc.bin

Hardware Setup

Refer to the figure below to make reprogramming cable.

Connection

First you plug ATMEL-ICE SWD cable to CN1.
ATMEL-ICE Power LED will turn on when you connect FTDI-BOARD with reprogramming cable to CN1.
If Power LED were not turn on, you should check a cable or connectors certainly plugged.