circuitpython-playing.txt

bokbokbok% bossac -i -p /dev/tty.usbmodem14121
Atmel SMART device 0x10010005 found
Device       : ATSAMD21G18A
Chip ID      : 10010005
Version      : v1.1 [Arduino:XYZ] Jan 17 2017 22:26:41
Address      : 8192
Pages        : 3968
Page Size    : 64 bytes
Total Size   : 248KB
Planes       : 1
Lock Regions : 16
Locked       : none
Security     : false
Boot Flash   : true
BOD          : true
BOR          : true
Arduino      : FAST_CHIP_ERASE
Arduino      : FAST_MULTI_PAGE_WRITE
Arduino      : CAN_CHECKSUM_MEMORY_BUFFER

bokbokbok% bossac -r -p /dev/tty.usbmodem14121 origfw.bin
Atmel SMART device 0x10010005 found

Read 253952 bytes from flash
[==========================    ] 89% (3564/3968 pages)
SAM-BA operation failed

bokbokbok% bossac -r -p /dev/tty.usbmodem14121 origfw.bin
Atmel SMART device 0x10010005 found

Read 253952 bytes from flash
[==============================] 100% (3968/3968 pages)
done in 10.418 seconds


bokbokbok% bossac -e -w -v -R  -p /dev/tty.usbmodem14121 ~/Downloads/adafruit-circuitpython-feather_m0_basic-0.8.4.bin
Atmel SMART device 0x10010005 found
Erase flash
done in 0.759 seconds

Write 189560 bytes to flash (2962 pages)
[==============================] 100% (2962/2962 pages)
done in 1.087 seconds

Verify 189560 bytes of flash with checksum.
Verify successful
done in 0.272 seconds
CPU reset.

bokbokbok% screen /dev/tty.usbmodem1412

------------


Press any key to enter the REPL and disable auto-reset. Use CTRL-D to soft reset.

Adafruit CircuitPython 0.8.4 on 2017-02-07; Adafruit Feather M0 Basic with samd21g18
>>> less main.py
Traceback (most recent call last):
  File "<stdin>", line 1
SyntaxError: invalid syntax
>>>
soft reboot

Auto-soft reset is on. Simply save files over USB to run them.
main.py output:
Traceback (most recent call last):
  File "main.py", line 8, in <module>
NameError: name 'NEOPIXEL' is not defined