Wio Terminal

Overview

The Wio Terminal is a small (72 mm x 57 mm x 12 mm) and powerful ARM board with wireless connectivity (2.4G/5G dual-band Wi-Fi and BLE 5.0), LCD display, USB C port, FPC connector, microSD card slot, Raspberry Pi compatible 40-pins header and 2 Grove connectors.

Hardware

ATSAMD51P19 ARM Cortex-M4F processor at 120 MHz
512 KiB flash memory and 192 KiB of RAM
4 MiB external flash
MicroSD card slot
RTL8720DN 2.4G/5G Dual Bands Wireless and BLE5.0 Combo Module
2.4inch LCD display
LIS3DH accelerometer
Microphone 1.0V-10V -42dB
Speaker ≥78dB @10cm 4000Hz
Light Sensor 400-1050nm
Infrared Emitter 940nm
GPIO 40 pin (Raspberry Pi compatible)
2x Grove connectors
1x user LED
3x user buttons
5-way user button
Power/Reset/Boot mode switch
Native USB port

Supported Features

The wio_terminal 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
GPIO	on-chip	I/O ports
USART	on-chip	Serial port
I2C	on-chip	Inter-Integrated Circuit
SPI	on-chip	Serial Peripheral Interface port
TRNG	on-chip	True Random Number Generator
HWINFO	on-chip	Unique 128 bit serial number
RTC	on-chip	Real-Time Counter
USB	on-chip	USB device
PWM	on-chip	PWM

Other hardware features are not currently supported by Zephyr.

The default configuration can be found in the Kconfig file boards/seeed/wio_terminal/wio_terminal_defconfig.

Zephyr can use the default Cortex-M SYSTICK timer or the SAM0 specific RTC. To use the RTC, set CONFIG_CORTEX_M_SYSTICK=n and set CONFIG_SYS_CLOCK_TICKS_PER_SEC to no more than 32 kHZ divided by 7, i.e. no more than 4500.

Connections and IOs

The Wio Terminal Getting started guide [1] has detailed information about the board including pinouts [2] and its schematics [3].

System Clock

The SAMD51 MCU is configured to use the 32.768 kHz internal oscillator with the on-chip PLL generating the 120 MHz system clock.

Serial Port

Zephyr console output is available using the USB connector, which is used to make the console available on PC as USB CDC class.

USB Device Port

The SAMD51 MCU has a USB device port that can be used to communicate with a host PC. See the USB device support sample applications for more, such as the USB CDC-ACM sample which sets up a virtual serial port that echos characters back to the host PC.

Programming and Debugging

The Wio Terminal ships with an UF2 bootloader that is BOSSA compatible. The bootloader can be entered by quickly tapping the reset button twice.

The UF2 file is generated when building the application, and it is possible to use it to flash the target. Enter the bootloader by quickly sliding the power button twice, and copy the UF2 file to the USB mass storage device. The device reboots on the new firmware after the UF2 file has finished transferring.

Flashing

Build the Zephyr kernel and the button sample application:
```
west build -b wio_terminal samples/basic/button
```
Swipe the reset/power button down twice quickly to enter bootloader mode
Flash the image:
```
west build -b wio_terminal samples/basic/button
west flash
```
You should see the blue (user) LED flashing whenever you press the third (counting from the top left) user button at the top of the Wio Terminal.

Debugging

In addition to the built-in bootloader, the Wio Terminal can be flashed and debugged using an SWD probe such as the Segger J-Link.

Solder cables to the SWCLK, SWDIO, RESET, GND, and 3V3 pins. See Test with SWD [4] for more information.
Connect the board to the probe by connecting the SWCLK, SWDIO, RESET, GND, and 3V3 pins on the Wio Terminal to the SWCLK, SWDIO, RESET, GND, and VTref pins on the J-Link [5].

Flash the image:

west build -b wio_terminal samples/basic/button
west flash -r openocd

Start debugging:

west build -b wio_terminal samples/basic/button
west debug