.. zephyr:board:: bl706_iot_dvk

Overview

The BL706-IoT-DVK is a development board from Bouffalo Lab based on the BL706 (QFN48 package, BL706C00Q2I) RISC-V microcontroller. It features USB-C connectivity, four indicator LEDs, and exposes most GPIO pins for peripheral evaluation. A USB-to-serial backplane provides JTAG debugging and UART console access.

Hardware

The BL706C00Q2I SoC has the following features:

32-bit RISC-V core (SiFive E24) running at 144 MHz
132 KB SRAM (64 KB instruction TCM + 64 KB data TCM/cache + 4 KB retention)
4 MB external flash (XIP) on module
USB 2.0 FS device
2x UART, 1x SPI, 1x I2C, 1x I2S
5-channel PWM
12-bit ADC / 10-bit DAC
Hardware security engine (AES/SHA/TRNG)
Bluetooth Low Energy 5.0 / Zigbee
32 GPIO pins (QFN48 package)

The board provides:

USB-C connector (for power, USB device interface, and CDC-ACM console)
USB-to-serial backplane (for UART console and JTAG debugging)
4 indicator LEDs (TX0, RX0, TX1, RX1)
UART0 on GPIO14 (TX) / GPIO15 (RX)
UART1 on GPIO18 (TX) / GPIO19 (RX)
SPI on GPIO3 (SCLK) / GPIO4 (MOSI) / GPIO5 (MISO) / GPIO6 (SS)
I2C on GPIO5 (SDA) / GPIO6 (SCL) (shared with SPI, disabled by default)
Exposed GPIO headers for peripheral connections

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

Default Zephyr Peripheral Mapping:

.. rst-class:: rst-columns

USB_DP : GPIO7
USB_DM : GPIO8
UART0_TX : GPIO14
UART0_RX : GPIO15
UART1_TX : GPIO18
UART1_RX : GPIO19
SPI0_SCLK : GPIO3
SPI0_MOSI : GPIO4
SPI0_MISO : GPIO5
SPI0_SS : GPIO6
I2C0_SDA : GPIO5 (shared with SPI)
I2C0_SCL : GPIO6 (shared with SPI)
TX0_LED : GPIO22
RX0_LED : GPIO29
TX1_LED : GPIO30
RX1_LED : GPIO31

Programming and Debugging

.. zephyr:board-supported-runners::

Building

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: bl706_iot_dvk :goals: build

Flashing

The board can be flashed over UART using bflb-mcu-tool. Hold the Boot button while pressing Reset to enter the bootloader, then run:

.. code-block:: console

west flash

Console

By default the board uses a USB CDC-ACM UART as the Zephyr console. After flashing and resetting the board, the console is available on the USB serial port at 115200 baud.

Alternatively, UART0 is available via the USB-to-serial backplane for console access without USB CDC-ACM.

References

.. target-notes::

.. _Bouffalo Lab BL702/BL706 Product Page: https://en.bouffalolab.com/product/?type=detail&id=4