WA2 Wi-Fi Module

by Tuya Inc. - product page

• Info & flashing guide

Information
Board code	wa2
MCU	Beken BK7231Q
Series	BK72XX
Specifications
Frequency	120 MHz
Flash size	2 MiB
RAM size	256 KiB
Voltage	3.0V - 3.6V
I/O	13x GPIO, 5x PWM, 2x UART, 2x ADC
Wi-Fi	802.11 b/g/n

Usage

Board code: wa2

In platformio.ini:

[env:wa2]
platform = libretiny
board = wa2
framework = arduino

In ESPHome YAML:

bk72xx:
  board: wa2

Quick flashing guide

• ltchiptool user guide
• full flashing guide

Pin	Connection
P10 / RX1	TX of USB-UART adapter
P11 / TX1	RX of USB-UART adapter
CEN (Chip-Enable)	GND to reset the chip

1. Connect the USB-UART adapter.
2. Start the flashing process.
3. Keep shorting CEN to GND or power-cycling the device, until flashing starts.

Pinout

Pin functions

Name(s)	UART	I²C	SPI	PWM	Other
P0	TX2	SCL2
P4, ADC1
P6				PWM0
P7				PWM1
P8				PWM2
P10	RX1
P11	TX1
P18				PWM4
P19				PWM5
P20		SCL1			TCK
P21		SDA1			TMS
P22					TDI
P23, ADC3					TDO

Flash memory map

Flash size: 2 MiB / 2,097,152 B / 0x200000

Hex values are in bytes.

Name	Code	Start	Length	End
Bootloader	bootloader	0x000000	68 KiB / 0x11000	0x011000
App Image	app	0x011000	1.1 MiB / 0x121000	0x132000
OTA Image	download	0x132000	664 KiB / 0xA6000	0x1D8000
LibreTiny Storage	kvs	0x1D8000	32 KiB / 0x8000	0x1E0000
Calibration	calibration	0x1E0000	4 KiB / 0x1000	0x1E1000
TLV Store	tlv	0x1E1000	4 KiB / 0x1000	0x1E2000
Network Data	net	0x1E2000	4 KiB / 0x1000	0x1E3000
User Data	userdata	0x1E3000	116 KiB / 0x1D000	0x200000

Bootloader and app partitions contain CRC16 sums every 32 bytes. That results in the actual flash offsets/sizes not aligned to sector boundaries. To simplify calculations, the values shown in the table (extracted from bootloader's partition table) were aligned to 4096 bytes.