BW12

by Ai-Thinker Co., Ltd.

Parameter	Value
Board code	`bw12`
MCU	RTL8710BX
Manufacturer	Realtek
Series	AmebaZ
Frequency	62.5 MHz
Flash size	2 MiB
RAM size	256 KiB
Voltage	3.0V - 3.6V
I/O	11x GPIO, 6x PWM, 2x UART, 1x ADC
Wi-Fi	802.11 b/g/n
FCC ID	2ARI3-BW1X

Usage

Board code: bw12

In platformio.ini:

[env:bw12]
platform = libretuya
board = bw12
framework = arduino

In ESPHome YAML:

libretuya:
  board: bw12
  framework:
    version: dev

Pinout

Arduino Core pin mapping

No.	Pin	UART	I²C	SPI	PWM	Other
D0	PA05				PWM4
D1	PA29	UART2_RX	I2C0_SCL		PWM4
D2	PA00				PWM2
D3	PA19	UART0_CTS	I2C0_SDA	SPI0_CS, SPI1_CS
D4	PA22	UART0_RTS	I2C0_SCL	SPI0_MISO, SPI1_MISO	PWM5
D5	PA30	UART2_TX	I2C0_SDA		PWM4
D6	PA14				PWM0	SWCLK
D7	PA12				PWM3
D8	PA15				PWM1	SWDIO
D9	PA18	UART0_RX	I2C1_SCL	SPI0_SCK, SPI1_SCK
D10	PA23	UART0_TX	I2C1_SDA	SPI0_MOSI, SPI1_MOSI	PWM0
A0	PA19, ADC1

Flash memory map

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

Hex values are in bytes.

Name	Start	Length	End
Boot XIP	0x000000	16 KiB / 0x4000	0x004000
Boot RAM	0x004000	16 KiB / 0x4000	0x008000
(reserved)	0x008000	4 KiB / 0x1000	0x009000
System Data	0x009000	4 KiB / 0x1000	0x00A000
Calibration	0x00A000	4 KiB / 0x1000	0x00B000
OTA1 Image	0x00B000	468 KiB / 0x75000	0x080000
OTA2 Image	0x080000	468 KiB / 0x75000	0x0F5000
Key-Value Store	0x0F5000	24 KiB / 0x6000	0x0FB000
User Data	0x0FB000	1 MiB / 0x104000	0x1FF000
RDP	0x1FF000	4 KiB / 0x1000	0x200000

RDP is most likely not used in Tuya firmwares, as the System Data partition contains an incorrect offset 0xFF000 for RDP, which is in the middle of OTA2 image.

Additionally, Tuya firmware uses an encrypted KV or file storage, which resides at the end of flash memory. This seems to overlap system RDP area.