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59 lines
2.1 KiB
Plaintext
59 lines
2.1 KiB
Plaintext
/**
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@defgroup boards_feather-m0 Adafruit Feather M0
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@ingroup boards
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@brief Support for the Adafruit Feather M0.
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### General information
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Feather M0 boards are development boards shipped by
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[Adafruit](https://learn.adafruit.com/adafruit-feather-m0-basic-proto/).
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All the feather M0 boards are built based on the same Atmel SAMD21G18A
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microcontroller. See @ref cpu_samd21.
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Several types of Feather M0 boards exist:
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* [Feather M0 WiFi](https://learn.adafruit.com/adafruit-feather-m0-wifi-atwinc1500/)
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* [Feather M0 BLE](https://learn.adafruit.com/adafruit-feather-m0-bluefruit-le/overview)
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* [Feather M0 Adalogger](https://learn.adafruit.com/adafruit-feather-m0-adalogger/)
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* [Feather M0 LoRa](https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module)
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The different modules used to differentiate the boards (ATWINC1500 WiFi,
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Bluefruit LE, SD card, LoRa) are connected via SPI (SPI_DEV(0)) to the
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SAMD21 mcu.
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### Pinout
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<img src="https://cdn-learn.adafruit.com/assets/assets/000/030/921/original/adafruit_products_2772_pinout_v1_0.png"
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alt="Adafruit Feather M0 proto pinout" style="width:800px;"/><br/>
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`AIN7` can be used to [measure the voltage of a connected Lipoly battery][battery].
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It is mapped to ADC_LINE(6) in RIOT.
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~~~~~~~~~~~~~~~~ {.c}
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int vbat = adc_sample(ADC_LINE(6), ADC_RES_10BIT);
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vbat *= 2; /* voltage was divided by 2, so multiply it back */
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vbat *= 33; /* reference voltage 3.3V * 10 */
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vbat /= 10240; /* resolution * 10 (because we multiplied 3.3V by 10) */
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printf("Bat: %dV\n", vbat);
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~~~~~~~~~~~~~~~~
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[battery]: https://learn.adafruit.com/adafruit-feather-m0-basic-proto/power-management#measuring-battery-4-9
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### Flash the board
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1. Put the board in bootloader mode by double tapping the reset button.<br/>
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When the board is in bootloader mode, the user led (red) oscillates smoothly.
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2. Use `BOARD=feather-m0` with the `make` command.<br/>
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Example with `hello-world` application:
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```
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make BOARD=feather-m0 -C examples/hello-world flash
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```
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### Accessing STDIO via UART
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To access the STDIO of RIOT, a FTDI to USB converted needs to be plugged to
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the RX/TX pins on the board.
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*/
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