CB1S Wi-Fi Module

by Tuya Inc.

Product page

• Info & flashing guide

Parameter	Value
Board code	cb1s
MCU	BK7231N
Manufacturer	Beken
Series	BK72XX
Frequency	120 MHz
Flash size	2 MiB
RAM size	256 KiB
Voltage	3.0V - 3.6V
I/O	14x GPIO, 6x PWM, 2x UART, 1x ADC
Wi-Fi	802.11 b/g/n
Bluetooth	BLE v5.1

Usage

Board code: cb1s

In platformio.ini:

[env:cb1s]
platform = libretiny
board = cb1s
framework = arduino

In ESPHome YAML:

bk72xx:
  board: cb1s

Pinout

Pin functions

Name(s)	UART	I²C	SPI	PWM	Other
P0	TX2	SCL2
P1	RX2	SDA2
P6				PWM0
P7				PWM1
P8				PWM2
P9				PWM3
P10	RX1
P11	TX1
P20		SCL1			TCK
P21		SDA1			TMS
P22					TDI
P23, ADC3					TDO
P24				PWM4
P26				PWM5

Flash memory map

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

Hex values are in bytes.

Name	Start	Length	End
Bootloader	0x000000	68 KiB / 0x11000	0x011000
App Image	0x011000	1.1 MiB / 0x119000	0x12A000
OTA Image	0x12A000	664 KiB / 0xA6000	0x1D0000
Calibration	0x1D0000	4 KiB / 0x1000	0x1D1000
Network Data	0x1D1000	4 KiB / 0x1000	0x1D2000
TLV Store	0x1D2000	4 KiB / 0x1000	0x1D3000
Key-Value Store	0x1D3000	32 KiB / 0x8000	0x1DB000
User Data	0x1DB000	148 KiB / 0x25000	0x200000
Tuya Storage	0x1ED000	76 KiB / 0x13000	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.