Adafruit Feather M0

Support for the Adafruit Feather M0. More...

Detailed Description

Support for the Adafruit Feather M0.

General information

Feather M0 boards are development boards shipped by Adafruit.

All the feather M0 boards are built based on the same Atmel SAMD21G18A microcontroller. See Atmel SAMD21.

Several types of Feather M0 boards exist: Feather M0 WiFi Feather M0 BLE Feather M0 Adalogger Feather M0 LoRa

The different modules used to differentiate the boards (ATWINC1500 WiFi, Bluefruit LE, SD card, LoRa) are connected via SPI (SPI_DEV(0)) to the SAMD21 mcu.

Pinout

AIN7 can be used to measure the voltage of a connected Lipoly battery. It is mapped to ADC_LINE(6) in RIOT.

int vbat = adc_sample(ADC_LINE(6), ADC_RES_10BIT);
vbat *= 2;      /* voltage was divided by 2, so multiply it back */
vbat *= 33;     /* reference voltage 3.3V * 10 */
vbat /= 10240;  /* resolution * 10 (because we multiplied 3.3V by 10) */
printf("Bat: %dV\n", vbat);

Flash the board

Use BOARD=feather-m0 with the make command.
Example with hello-world application:

make BOARD=feather-m0 -C examples/hello-world flash

Note

If the application crashes, automatic reflashing via USB, as explained above won't be possible. In this case, the board must be set in bootloader mode by double tapping the reset button before running the flash command.

Accessing STDIO via UART

STDIO of RIOT is directly available over the USB port.

The TERM_DELAY environment variable can be used to add a delay (in second) before opening the serial terminal. The default value is 2s which should be enough in most of the situation.

Files
file	board.h
	Board specific configuration for the Adafruit Feather M0.
file	gpio_params.h
	Board specific configuration of direct mapped GPIOs.
file	periph_conf.h
	Configuration of CPU peripherals for Adafruit Feather M0.
file	sdcard_spi_params.h
	SD card configuration for the Adafruit Feather M0 Adalogger.