This port brings MicroPython to SAMD21x18 based development boards under the name CircuitPython. Supported boards include the Adafruit CircuitPlayground Express, Adafruit Feather M0 Express, Adafruit Metro M0 Express, Arduino Zero, Adafruit Feather M0 Basic and Adafruit M0 Bluefruit LE.

All of the boards share the same core pin functionality but call pins by different names. The table below matches the pin order in the datasheet and omits the pins only available on the largest package because all supported boards use smaller version.

Here is a table about which pins can do what in CircuitPython terms. However, just because something is listed, doesn't mean it will always work. Existing use of other pins and functionality will impact your ability to use a pin for your desired purpose. For example, only certain combinations of SPI pins will work because they use shared hardware internally.

To build for the Arduino Zero:

make

To build for other boards you must change it by setting BOARD. For example:

make BOARD=feather_m0_basic

Board names are the directory names in the boards folder.

If your board has an existing Arduino bootloader on it then you can use bossac to flash MicroPython. First, activate the bootloader. On Adafruit Feathers you can double click the reset button and the #13 will fade in and out. Finally, run bossac:

tools/bossac_osx -e -w -v -b -R build-feather_m0_basic/firmware.bin

This method works for loading MicroPython onto the Arduino Zero via the programming port rather than the native USB port.

Note: These instructions are tested on Mac OSX and will vary for different platforms.

openocd -f ~/Library/Arduino15/packages/arduino/hardware/samd/1.6.6/variants/arduino_zero/openocd_scripts/arduino_zero.cfg

In another terminal from micropython/atmel-samd:

arm-none-eabi-gdb build-arduino_zero/firmware.elf (gdb) tar ext :3333 ... (gdb) load ... (gdb) monitor reset init ... (gdb) continue

All boards are currently configured to work over USB rather than UART. To connect to it from OSX do something like this:

screen /dev/tty.usbmodem142422 115200

You may not see a prompt immediately because it doesn't know you connected. To get one either hit enter to get >>> or do CTRL-B to get the full header.

All boards will also show up as a mass storage device. Make sure to eject it before resetting or disconnecting the board.

.. toctree::
    bindings/samd/__init__