2. Hardware connection

This document introduces how to connect the board of BL70x series MCU.

2.1. BL706_IOT

2.1.3. Use serial port to Programming

  • Before using the serial port to Programming, please make sure that Bouffalo Lab Dev Cube or the command programming tool is installed correctly

    • Use Type-C USB data cable or Mini USB data cable to connect to the Type-C interface or Mini interface on the board.

    • Press the Boot key on the board, don’t release it.

    • Press the RST key on the board, now you have entered Boot ROM, you can release the two keys.

    • At this time, you can see the corresponding serial port COM number from the Bouffalo Lab Dev Cube, if it does not appear, please click the Refresh key to refresh.

  • If you don’t have a suitable data cable, you can also use some common USB-TTL modules to connect to the UART0 port of the development board for programming. UART0 is on the HD1 group, the connection method is as follows:

USB-TTL      BL702_IoT
----------------------
  3V3   <-->   VDD
  TXD   <-->   RX0
  RXD   <-->   TX0
  GND   <-->   GND

  • The programming step is the same as above

2.2. BL706_AVB

重要

BL706_AVB has multiple multiplexed pins, please check carefully whether the required function pins are multiplexed; FUNC1: “Default: PIX; Connect: I2S/JTAG”, FUNC2: “Default: I2S; Connect: SPI” ; If you need to debug, please remember to connect the FUNC1 jumper

2.2.1. Use Sipeed RV-Debugger Plus to programming and debug

  • Powering the BL706_AVB

  • Connect the RV-Debugger Plus debugger to the USB port of the computer. If the driver is not installed correctly, please refer to Sipeed RV-Debugger Plus driver installation settings, set the driver, and proceed to the following steps

  • Connect the debugger and the BL706_AVB with a cable (as shown in the figure below)

重要

The FUNC1 jumper must be connected when debugging, otherwise the pins will be multiplexed with other functions and the JTAG function cannot be used; the serial port function can be used normally

RV-Debugger connect bl706_avb board

2.2.2. Use CK-Link to programming and debug

  • Connect the CK-Link USB interface to the PC with a suitable USB data cable

  • Connect the FUNC1 jump caps of the bl706_avb

  • Connect the pins of the HD8 group to the adapter board using a flat cable

  • Connect the JTAG pin of the adapter board with the corresponding JTAG pin of CK-Link using a Dupont wire

  • If you do not use CK-Link to power the board, you need to power the board separately

bl706-avb board         CK-Link
-------------------------------
    JTAG_TDI     <-->     TDI
    JTAG_TDO     <-->     TDO
    JTAG_TCK     <-->     TCK
    JTAG_TMS     <-->     TMS
    VDD33        <-->     VREF
    GND          <-->     GND

ck_link connect bl706_avb board

2.2.3. Use serial port to programming

  • Before using the serial port to programming, please make sure that Bouffalo Lab Dev Cube or the command programming tool is installed correctly

    • Use the Type-C USB or Mini USB data cable to connect to the corresponding Type-C port or Mini port on the board.

    • Press the Boot key on the board, don’t release it.

    • Press the RST key on the board, now you have entered Boot ROM, you can release the two keys.

    • At this time, you can see the corresponding serial port COM number from the Bouffalo Lab Dev Cube, if it does not appear, please click the Refresh button to refresh.

  • If you don’t have a suitable data cable, you can also use some common USB-TTL modules to connect to the UART0 port of the development board for programming. UART0 on the HD12 group, the connection method is as follows:

  • If you use Sipeed RV-Debugger Plus to connect BL706_AVB through a flat cable, you can also use the serial port of Sipeed RV Debugger Plus

USB-TTL      BL706_AVB
----------------------
  TXD   <-->   RX0
  RXD   <-->   TX0
  GND   <-->   GND

2.2.4. Connect BL706 AVB sub-modules

  • This section describes how to connect the BL706_AVB board with other modules, mainly including camera connection, Audio Codec module connection, and SPI screen connection.

BL706_AVB Connects to GC0308 Camera Module

    1. First, take the black locking part of the J5 drawer type FPC cable holder on the back of the BL706_AVB development board and pull it out from the edge

    1. When fully disconnected, as shown in the figure below.

    1. The FPC cable holder is a drawer down type, so next insert the camera with the side without metal contact points facing upwards into the FPC cable holder

  • After inserting the camera, press the black latch tightly

BL706_AVB Connecting Audio Codec Modules

  • Insert the HD19 group of pins of Audio Codec module into the HD11 row female socket of BL706_AVB development board; note that the module is extended outward.

  • The schematic diagram is as follows：