SAM C21N Xplained Pro Evaluation Kit
Overview
The SAM C21N Xplained Pro evaluation kit is ideal for evaluation and prototyping with the SAM C21N Cortex®-M0+ processor-based microcontrollers. The kit includes Atmel’s Embedded Debugger (EDBG), which provides a full debug interface without the need for additional hardware.
Hardware
ATSAMC21N18A ARM Cortex-M0+ processor at 48 MHz
32.768 kHz crystal oscillator
256 KiB flash memory, 32 KiB of RAM, 8KB RRW flash
One yellow user LED
One mechanical user push button
One reset button
One QTouch® button
On-board USB based EDBG unit with serial console
Two CAN transceivers
Supported Features
The atsamc21n_xpro board configuration supports the following hardware features:
Interface |
Controller |
Driver / Component |
|---|---|---|
NVIC |
on-chip |
nested vector interrupt controller |
Flash |
on-chip |
Can be used with LittleFS to store files |
SYSTICK |
on-chip |
systick |
WDT |
on-chip |
Watchdog |
ADC |
on-chip |
Analog to Digital Converter |
GPIO |
on-chip |
I/O ports |
PWM |
on-chip |
Pulse Width Modulation |
USART |
on-chip |
Serial ports |
I2C |
on-chip |
I2C ports |
SPI |
on-chip |
Serial Peripheral Interface ports |
Other hardware features are not currently supported by Zephyr.
The default configuration can be found in the Kconfig
boards/arm/atsamc21n_xpro/atsamc21n_xpro_defconfig.
Pin Mapping
The SAM C21N Xplained Pro evaluation kit has 4 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.
For mode details please refer to SAM C21 Family Datasheet 1 and the SAM C21N Xplained Pro Schematic 2.
Default Zephyr Peripheral Mapping:
ADC0 : PB09
ADC1 : PA08
SERCOM0 USART TX : PB24
SERCOM0 USART RX : PB25
SERCOM1 I2C SDA : PA16
SERCOM1 I2C SCL : PA17
SERCOM2 USART TX : PA12
SERCOM2 USART RX : PA13
SERCOM4 USART TX : PB10
SERCOM4 USART RX : PB11
SERCOM5 SPI MISO : PB00
SERCOM5 SPI MOSI : PB02
SERCOM5 SPI SCK : PB01
GPIO/PWM LED0 : PC05
System Clock
The SAMC21 MCU is configured to use the 32.768 kHz internal oscillator with the on-chip internal oscillator generating the 48 MHz system clock.
Serial Port
The SAMC21 MCU has eight SERCOM based USARTs with three configured as USARTs in this BSP. SERCOM4 is the default Zephyr console.
SERCOM0 9600 8n1
SERCOM2 115200 8n1
SERCOM4 115200 8n1 connected to the onboard Atmel Embedded Debugger (EDBG)
PWM
The SAMC21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period
of 24 bits or 16 bits. If CONFIG_PWM_SAM0_TCC is enabled then LED0 is
driven by TCC2 instead of by GPIO.
Programming and Debugging
The SAM C21N Xplained Pro comes with a Atmel Embedded Debugger (EDBG). This provides a debug interface to the SAMC21 chip and is supported by OpenOCD.
Flashing
Build the Zephyr kernel and the
hello_worldsample application:west build -b atsamc21n_xpro samples/hello_worldConnect the SAM C21N Xplained Pro to your host computer using the USB debug port.
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
To flash an image:
west build -b atsamc21n_xpro samples/hello_world west flash
You should see “Hello World! atsamc21n_xpro” in your terminal.