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Generic - RTL8710BX (4M/980k)

by Generic

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Parameter Value
Board code generic-rtl8710bx-4mb-980k
MCU RTL8710BX
Manufacturer Realtek
Series AmebaZ
Frequency 62.5 MHz
Flash size 4 MiB
RAM size 256 KiB
Voltage 3.0V - 3.6V
I/O 17x GPIO, 6x PWM, 2x UART, 1x ADC
Wi-Fi 802.11 b/g/n

Usage

Board code: generic-rtl8710bx-4mb-980k

In platformio.ini:

[env:generic-rtl8710bx-4mb-980k]
platform = libretuya
board = generic-rtl8710bx-4mb-980k
framework = arduino

In ESPHome YAML:

libretuya:
  board: generic-rtl8710bx-4mb-980k
  framework:
    version: dev

Arduino Core pin mapping

No. Pin UART IĀ²C SPI PWM Other
D0 PA00 PWM2
D1 PA05 PWM4
D2 PA06 FCS
D3 PA07 FD1
D4 PA08 FD2
D5 PA09 FD0
D6 PA10 FSCK
D7 PA11 FD3
D8 PA12 PWM3
D9 PA14 PWM0 SWCLK
D10 PA15 PWM1 SWDIO
D11 PA18 UART0_RX I2C1_SCL SPI0_SCK, SPI1_SCK
D12 PA19 UART0_CTS I2C0_SDA SPI0_CS, SPI1_CS
D13 PA22 UART0_RTS I2C0_SCL SPI0_MISO, SPI1_MISO PWM5
D14 PA23 UART0_TX I2C1_SDA SPI0_MOSI, SPI1_MOSI PWM0
D15 PA29 UART2_RX I2C0_SCL PWM4
D16 PA30 UART2_TX I2C0_SDA PWM4
A0 PA19, ADC1

Flash memory map

Flash size: 4 MiB / 4,194,304 B / 0x400000

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 980 KiB / 0xF5000 0x100000
OTA2 Image 0x100000 980 KiB / 0xF5000 0x1F5000
Key-Value Store 0x1F5000 32 KiB / 0x8000 0x1FD000
User Data 0x1FD000 2 MiB / 0x202000 0x3FF000
RDP 0x3FF000 4 KiB / 0x1000 0x400000

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.

Information

This is a generic board definition for RTL8710BX with 4 MiB of flash. It has a bigger application partition size (980 KiB). The used bootloader is also different from the standard Tuya one.

It can be found in Ezviz T31 smart plug - bare chip soldered onto the manufacturer-made PCB. The plug is not Tuya/SmartLife-compatible and has a 25Q32CSIG flash chip. Refer to libretiny#23 for photos and more information.

Note that stock firmware seems to use smaller app images (0x80000 / 512 KiB). After 0x180000 some product-test data and device logs can be found. Because the OTA2 offset is 0x100000, the board definition was configured to use all available space.