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157 lines
4.1 KiB
157 lines
4.1 KiB
.. zephyr:board:: adafruit_grand_central_m4_express |
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Overview |
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The Adafruit Grand Central M4 Express is an ARM development board with the |
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form factor of an Arduino Mega. |
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It features 70 GPIO pins, a microSDHC slot and 8MiB of QSPI Flash. |
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Hardware |
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- ATSAMD51P20A ARM Cortex-M4F processor at 120 MHz |
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- 1024 KiB of flash memory and 256 KiB of RAM |
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- 8 MiB of QSPI flash |
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- A red user LED |
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- A RGB "NeoPixel" / WS2812B LED |
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- A microSDHC slot (connected via SPI) |
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- Native USB port |
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Supported Features |
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================== |
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.. zephyr:board-supported-hw:: |
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Connections and IOs |
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=================== |
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The `Adafruit Learning System`_ has detailed information about |
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the board including `pinouts`_ and the `schematics`_. |
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System Clock |
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============ |
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The SAMD51 MCU is configured to use the 32.768 kHz external oscillator |
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with the on-chip PLL generating the 120 MHz system clock. |
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Serial Port |
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=========== |
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The SAMD51 MCU has 8 SERCOM based UARTs. On the Grand Central, SERCOM0 is |
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the Zephyr console and is available on RX(PB25) and TX(PB24). |
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SPI Port |
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======== |
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The SAMD51 MCU has 8 SERCOM based SPIs. On the Grand Central, SERCOM7 has been |
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set into SPI mode to connect to devices over the SCK(PD09), MOSI(PD08), and MISO(PD11) pins. |
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Additionally SERCOM2 has been configured as SPI to access the microSDHC card. |
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I2C Port |
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======== |
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The SAMD51 MCU has 8 SERCOM based I2Cs. On the Grand Central, SERCOM3 has been |
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configured as I2C to connect to devices over the SCL(PB21) and SDA(PB20) pins. |
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USB Device Port |
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=============== |
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The SAMD51 MCU has a USB device port that can be used to communicate |
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with a host PC. See the :zephyr:code-sample-category:`usb` sample applications for |
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more, such as the :zephyr:code-sample:`usb-cdc-acm` sample which sets up a virtual |
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serial port that echos characters back to the host PC. |
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Programming and Debugging |
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************************* |
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.. zephyr:board-supported-runners:: |
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The Grand Central ships with a BOSSA compatible UF2 bootloader. |
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The bootloader can be entered by quickly tapping the reset button twice. |
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Flashing |
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======== |
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#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application: |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: adafruit_grand_central_m4_express |
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:goals: build |
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:compact: |
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#. Connect the Grand Central to your host computer using USB. |
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#. Connect a 3.3 V USB to serial adapter to the board and to the |
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host. See the `Serial Port`_ section above for the board's pin |
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connections. |
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#. Run your favorite terminal program to listen for output. Under Linux the |
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terminal should be :code:`/dev/ttyUSB0`. For example: |
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.. code-block:: console |
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$ minicom -D /dev/ttyUSB0 -o |
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The -o option tells minicom not to send the modem initialization |
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string. Connection should be configured as follows: |
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- Speed: 115200 |
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- Data: 8 bits |
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- Parity: None |
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- Stop bits: 1 |
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#. Tap the reset button twice quickly to enter bootloader mode |
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#. Flash the image: |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: adafruit_grand_central_m4_express |
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:goals: flash |
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:compact: |
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You should see "Hello World! adafruit_grand_central_m4_express" in your terminal. |
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Debugging |
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========= |
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In addition to the built-in bootloader, the Grand Central can be flashed and |
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debugged using a SWD probe such as the Segger J-Link. |
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#. Connect the probe to the board using the 10-pin SWD interface. |
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#. Flash the image: |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: adafruit_grand_central_m4_express |
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:goals: flash |
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:flash-args: -r openocd |
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:compact: |
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#. Start debugging: |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: adafruit_grand_central_m4_express |
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:goals: debug |
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:compact: |
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References |
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********** |
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.. target-notes:: |
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.. _Adafruit Learning System: |
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https://learn.adafruit.com/adafruit-grand-central |
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.. _pinouts: |
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https://learn.adafruit.com/adafruit-grand-central/pinouts |
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.. _schematics: |
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https://learn.adafruit.com/adafruit-grand-central/downloads |
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.. _J-Link: |
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https://www.segger.com/products/debug-probes/j-link/technology/interface-description/
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