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
SAMC21N18A 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 samc21n_xpro board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
samc21n_xpro/samc21n18a target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M0+ CPU1 |
|
ADC |
on-chip |
||
ARM architecture |
on-chip |
Atmel SAM0 multi-protocol (UART, SPI, I2C) SERCOM unit1 |
|
on-chip |
For locating the Device ID (serial number) on Atmel SAM0 devices1 |
||
CAN |
on-chip |
Specialization of Bosch m_can CAN FD controller for Atmel SAM01 1 |
|
Clock control |
on-chip |
Atmel SAM0 Main Clock Controller (MCLK)1 |
|
on-chip |
Atmel SAM0 32kHz Oscillator Controller (OSC32KCTRL)1 |
||
on-chip |
Atmel SAMD0 Generic Clock Controller (GCLK)1 |
||
DMA |
on-chip |
Atmel SAM0 DMA controller1 |
|
Flash controller |
on-chip |
Atmel SAM0 NVMC (Non-Volatile Memory Controller)1 |
|
GPIO & Headers |
on-chip |
SAM0 GPIO PORT node3 |
|
I2C |
on-chip |
Atmel SAM0 series SERCOM I2C1 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1 |
|
on-chip |
Atmel SAM0 series External Interrupt Controller1 |
||
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
on-board |
Group of PWM-controlled LEDs1 |
||
MTD |
on-chip |
Flash node1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Pin control |
on-chip |
Atmel SAM0 PINMUX1 |
|
on-chip |
Atmel SAM0 Pinctrl Container1 |
||
PWM |
on-chip |
Atmel SAM0 TCC in PWM mode1 |
|
RTC |
on-chip |
Atmel SAM0 RTC1 |
|
Serial controller |
on-chip |
Atmel SAM0 SERCOM UART driver3 |
|
SPI |
on-chip |
Atmel SAM0 SERCOM SPI controller1 |
|
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv6-M System Tick1 |
|
Watchdog |
on-chip |
Atmel SAM0 watchdog1 |
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 more 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
CAN0 TX : PA24
CAN0 RX : PA25
CAN1 TX : PB14
CAN1 RX : PB15
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 samc21n_xpro samples/hello_world
Connect 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 samc21n_xpro samples/hello_world west flash
You should see “Hello World! samc21n_xpro” in your terminal.