Generic - RTL8710BX (4M/980k)
by Generic
| 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:
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.