195 lines
4.7 KiB
ReStructuredText
195 lines
4.7 KiB
ReStructuredText
.. _samc21n_xpro:
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SAM C21N Xplained Pro Evaluation Kit
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####################################
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Overview
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********
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The SAM C21N Xplained Pro evaluation kit is ideal for evaluation and
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prototyping with the SAM C21N Cortex®-M0+ processor-based
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microcontrollers. The kit includes Atmel’s Embedded Debugger (EDBG),
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which provides a full debug interface without the need for additional
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hardware.
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.. image:: img/atsamc21n_xpro.jpg
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:align: center
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:alt: SAMC21N-XPRO
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Hardware
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********
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- SAMC21N18A ARM Cortex-M0+ processor at 48 MHz
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- 32.768 kHz crystal oscillator
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- 256 KiB flash memory, 32 KiB of RAM, 8KB RRW flash
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- One yellow user LED
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- One mechanical user push button
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- One reset button
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- One QTouch® button
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- On-board USB based EDBG unit with serial console
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- Two CAN transceivers
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Supported Features
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==================
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The samc21n_xpro board configuration supports the following hardware
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features:
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.. list-table::
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:header-rows: 1
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* - Interface
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- Controller
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- Driver / Component
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* - NVIC
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- on-chip
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- nested vector interrupt controller
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* - Flash
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- on-chip
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- Can be used with LittleFS to store files
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* - SYSTICK
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- on-chip
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- systick
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* - WDT
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- on-chip
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- Watchdog
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* - ADC
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- on-chip
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- Analog to Digital Converter
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* - GPIO
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- on-chip
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- I/O ports
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* - PWM
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- on-chip
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- Pulse Width Modulation
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* - USART
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- on-chip
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- Serial ports
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* - I2C
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- on-chip
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- I2C ports
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* - SPI
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- on-chip
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- Serial Peripheral Interface ports
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* - CAN
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- on-chip
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- CAN ports
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Other hardware features are not currently supported by Zephyr.
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The default configuration can be found in the Kconfig
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``boards/atmel/sam0/samc21n_xpro/samc21n_xpro_defconfig``.
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Pin Mapping
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===========
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The SAM C21N Xplained Pro evaluation kit has 4 GPIO controllers. These
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controllers are responsible for pin muxing, input/output, pull-up, etc.
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For more details please refer to `SAM C21 Family Datasheet`_ and the `SAM C21N
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Xplained Pro Schematic`_.
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Default Zephyr Peripheral Mapping:
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----------------------------------
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- ADC0 : PB09
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- ADC1 : PA08
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- CAN0 TX : PA24
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- CAN0 RX : PA25
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- CAN1 TX : PB14
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- CAN1 RX : PB15
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- SERCOM0 USART TX : PB24
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- SERCOM0 USART RX : PB25
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- SERCOM1 I2C SDA : PA16
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- SERCOM1 I2C SCL : PA17
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- SERCOM2 USART TX : PA12
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- SERCOM2 USART RX : PA13
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- SERCOM4 USART TX : PB10
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- SERCOM4 USART RX : PB11
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- SERCOM5 SPI MISO : PB00
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- SERCOM5 SPI MOSI : PB02
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- SERCOM5 SPI SCK : PB01
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- GPIO/PWM LED0 : PC05
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System Clock
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============
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The SAMC21 MCU is configured to use the 32.768 kHz internal oscillator
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with the on-chip internal oscillator generating the 48 MHz system clock.
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Serial Port
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===========
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The SAMC21 MCU has eight SERCOM based USARTs with three configured as USARTs in
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this BSP. SERCOM4 is the default Zephyr console.
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- SERCOM0 9600 8n1
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- SERCOM2 115200 8n1
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- SERCOM4 115200 8n1 connected to the onboard Atmel Embedded Debugger (EDBG)
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PWM
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===
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The SAMC21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period
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of 24 bits or 16 bits. If :code:`CONFIG_PWM_SAM0_TCC` is enabled then LED0 is
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driven by TCC2 instead of by GPIO.
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Programming and Debugging
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*************************
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The SAM C21N Xplained Pro comes with a Atmel Embedded Debugger (EDBG). This
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provides a debug interface to the SAMC21 chip and is supported by
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OpenOCD.
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Flashing
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========
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#. Build the Zephyr kernel and the ``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: samc21n_xpro
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:goals: build
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:compact:
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#. Connect the SAM C21N Xplained Pro to your host computer using the USB debug
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port.
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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/ttyACM0`. For example:
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.. code-block:: console
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$ minicom -D /dev/ttyACM0 -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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#. To flash an image:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: samc21n_xpro
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:goals: flash
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:compact:
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You should see "Hello World! samc21n_xpro" in your terminal.
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References
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**********
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.. target-notes::
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.. _Microchip website:
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https://www.microchip.com/en-us/development-tool/ATSAMC21N-XPRO
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.. _SAM C21 Family Datasheet:
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https://ww1.microchip.com/downloads/aemDocuments/documents/MCU32/ProductDocuments/DataSheets/SAM-C20-C21-Family-Data-Sheet-DS60001479J.pdf
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.. _SAM C21N Xplained Pro Schematic:
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https://ww1.microchip.com/downloads/en/DeviceDoc/ATSAMC21N_Xplained_Pro_Design_Files.zip
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