Adafruit Feather M0 Basic Proto¶
The Adafruit Feather M0 Basic Proto is a thin, light ARM development board with an onboard battery connector and charger for 3.7 V lithium polymer batteries, charging status indicator and user LEDs, native USB connector, 20 I/O pins, and a small prototyping area.
- ATSAMD21G18A ARM Cortex-M0+ processor at 48 MHz
- 32.768 kHz crystal oscillator
- 256 KiB flash memory and 32 KiB of RAM
- Battery connector and charger for 3.7 V lithium polymer batteries
- Charging indicator LED
- User LED
- Reset button
- Native USB port
The adafruit_feather_m0_basic_proto board configuration supports the following hardware features:
|NVIC||on-chip||Nested vector interrupt controller|
|Flash||on-chip||Can be used with NFFS to store files|
|SPI||on-chip||Serial Peripheral Interface port|
Other hardware features are not currently supported by Zephyr.
The default configuration can be found in the Kconfig file boards/arm/adafruit_feather_m0_basic_proto/adafruit_feather_m0_basic_proto_defconfig.
Connections and IOs¶
The SAMD21 MCU is configured to use the 32.768 kHz external oscillator with the on-chip PLL generating the 48 MHz system clock.
The SAMD21 MCU has 6 SERCOM based USARTs. On the Adafruit Feather M0 Basic Proto, SERCOM0 is the Zephyr console and is available on pins 0 (RX) and 1 (TX).
The SAMD21 MCU has 6 SERCOM based SPIs. On the Adafruit Feather M0 Basic Proto, SERCOM4 is available on pin 22 (MISO), pin 23 (MOSI), and pin 24 (SCK).
Programming and Debugging¶
The Adafruit Feather M0 Basic Proto ships with a BOSSA compatible SAM-BA bootloader. The bootloader can be entered by quickly tapping the reset button twice.
Build the Zephyr kernel and the Hello World sample application:
# On Linux/macOS cd $ZEPHYR_BASE/samples/hello_world mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\hello_world mkdir build & cd build cmake -GNinja -DBOARD=adafruit_feather_m0_basic_proto .. ninja
Connect the Adafruit Feather M0 Basic Proto to your host computer using USB
Connect a 3.3 V USB to serial adapter to the board and to the host. See the Serial Port section above for the board’s pin connections.
Run your favorite terminal program to listen for output. Under Linux the terminal should be
/dev/ttyACM0. For example:
$ minicom -D /dev/ttyACM0 -o
The -o option tells minicom not to send the modem initialization string. Connection should be configured as follows:
- Speed: 115200
- Data: 8 bits
- Parity: None
- Stop bits: 1
Tap the reset button twice quickly to enter bootloader mode
Flash the image:
# On Linux/macOS cd $ZEPHYR_BASE/samples/hello_world mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\hello_world mkdir build & cd build cmake -GNinja -DBOARD=adafruit_feather_m0_basic_proto .. ninja flash
You should see “Hello World! arm” in your terminal.