SAM D20 Xplained Pro Evaluation Kit
Overview
The SAM D20 Xplained Pro evaluation kit is ideal for evaluation and prototyping with the SAM D20 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.
SAMD20-XPRO (Credit: Microchip Technology [1])
Hardware
SAMD20J18 ARM Cortex-M0+ processor at 48 MHz
32.768 kHz crystal oscillator
256 KiB flash memory and 32 KiB of RAM
One yellow user LED
One mechanical user push button
One reset button
On-board USB based EDBG unit with serial console
Supported Features
The samd20_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 |
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/atmel/sam0/samd20_xpro/samd20_xpro_defconfig.
Connections and IOs
The Microchip website [1] has detailed information about board connections. Download the SAM D20 Xplained Pro Schematic [2] for more detail.
System Clock
The SAMD20 MCU is configured to use the 32.768 kHz external oscillator with the on-chip PLL generating the 48 MHz system clock.
Serial Port
The SAMD20 MCU has 6 SERCOM based USARTs. One of the USARTs (SERCOM3) is connected to the onboard Atmel Embedded Debugger (EDBG). SERCOM4 is available on the EXT1 connector.
SPI Port
The SAMD20 MCU has 6 SERCOM based SPIs. On the SAM D20 Xplained Pro, SERCOM0 is available on the EXT1 connector.
Programming and Debugging
The SAM D20 Xplained Pro comes with a Atmel Embedded Debugger (EDBG). This provides a debug interface to the SAMD20 chip and is supported by OpenOCD.
Flashing
Build the Zephyr kernel and the Hello World sample application:
west build -b samd20_xpro samples/hello_world
Connect the SAM D20 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 samd20_xpro samples/hello_world west flash
You should see “Hello World! samd20_xpro” in your terminal.