Bluetooth LE–BK3431Q

This topic describes the basics of the chip platform used in TuyaOS development. For more information, visit Tuya Developer Forum.

Hardware environment

Datasheet

The datasheet can be found in hardware\bk3431q\chip_manual\BK3431Q Datasheet V1.3.pdf.

Development board

Development board from BEKEN.

Peripherals

UART

This platform has two UARTs. TuyaOS uses the UART listed below. The pin configuration is fixed and cannot be modified. The other UART (TX P16) is used for log output.

SPI

This platform has only one SPI bus.

I2C

This platform has only one I2C bus.

PWM

This platform supports 6-channel PWM output. The default PWM pins after initialization are shown below.

ADC

This platform has eight pins for ADC multiplexing.

Other pins used by TuyaOS

This platform has only one I2C bus.

Software environment

Keil

1. Download Keil from the Arm Keil website. mdk528a.exe is recommended. During installation, keep all the default settings.

2. If you are prompted to install a driver, continue with Install.

3. When opening Keil, if you are prompted to install a software pack, close the window.

4. After Keil is installed, add the path of the UV4.exe file to the environment variable. For example: TUYAOS_COMPILE_TOOL: C:\Keil_v5\UV4, as shown below.

   

Firmware flashing

Flashing guide

Path: hardware\\bk3431q\module_manual

Flashing tool

Path: pc\tools\bk3431q

Features

Startup time

• Use a logic analyzer to measure the signal time difference between the VCC pin and the startup time detection pin.

• Detection pins: peripheral → startup time detection pin

  

Flash partition

Adjust flash partitions

In the original project, you can modify the following macros to adjust the default flash partitions.

// Flash
#ifndef BOARD_FLASH_BULK_DATA_START_ADDR
#define BOARD_FLASH_BULK_DATA_START_ADDR        (0x77000)
#endif

#ifndef BOARD_FLASH_TUYA_INFO_START_ADDR
#define BOARD_FLASH_TUYA_INFO_START_ADDR        (0x7B000)
#endif

// #ifndef BOARD_FLASH_OTA_INFO_ADDR
// #define BOARD_FLASH_OTA_INFO_ADDR               (0x7C000)
// #endif

#ifndef BOARD_FLASH_OTA_START_ADDR
#define BOARD_FLASH_OTA_START_ADDR              (0x44000)
#endif

#ifndef BOARD_FLASH_OTA_END_ADDR
#define BOARD_FLASH_OTA_END_ADDR                (0x64000)
#endif

#ifndef BOARD_FLASH_OTA_SIZE
#define BOARD_FLASH_OTA_SIZE                    (BOARD_FLASH_OTA_END_ADDR - BOARD_FLASH_OTA_START_ADDR)
#endif

#ifndef BOARD_FLASH_MAC_START_ADDR
#define BOARD_FLASH_MAC_START_ADDR              (0x7F000)
#endif

Power consumption

Measure the average power consumption of typical one-second advertising.