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AFW121T

by 99iot(Shenzhen)co.,ltd - product page

Information  
Board code afw121t
MCU Realtek RTL8710BX
Series AmebaZ
Partition layout Small Realtek/OEM (2x 468k apps)
Specifications  
Frequency 62.5 MHz
Flash size 1 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

Usage

Board code: afw121t

In platformio.ini:

[env:afw121t]
platform = libretiny
board = afw121t
framework = arduino

In ESPHome YAML:

rtl87xx:
  board: afw121t

Quick flashing guide

Pin Connection
PA29 / RX2 TX of USB-UART adapter
PA30 / TX2 RX of USB-UART adapter
PA29 (strapping pin) GND to enter download mode
CEN (Chip-Enable) GND to reset the chip
  1. Connect the USB-UART adapter.
  2. Connect PA29 (TX2) to GND.
  3. Power-cycle the device or briefly short CEN to GND.
  4. Disconnect PA29 from GND, keep connected to USB-UART.
  5. Start the flashing process.

Pinout

Pinout

Pin functions

Name(s) UART IĀ²C SPI PWM Other
PA00 PWM2
PA05 PWM4
PA12 PWM3
PA14 PWM0 SWCLK
PA15 PWM1 SWDIO
PA18 RX0 SCL1 SCK0, SCK1
PA19, ADC1 SDA0 CS0, CS1
PA22 SCL0 MISO0, MISO1 PWM5
PA23 TX0 SDA1 MOSI0, MOSI1 PWM0
PA29 RX2 SCL0 PWM4
PA30 TX2 SDA0 PWM4

Flash memory map

Flash size: 1 MiB / 1,048,576 B / 0x100000

Hex values are in bytes.

Name Code Start Length End
Boot XIP boot_xip 0x000000 16 KiB / 0x4000 0x004000
Boot RAM boot_ram 0x004000 16 KiB / 0x4000 0x008000
(reserved) - 0x008000 4 KiB / 0x1000 0x009000
System Data system 0x009000 4 KiB / 0x1000 0x00A000
Calibration calibration 0x00A000 4 KiB / 0x1000 0x00B000
OTA1 Image ota1 0x00B000 468 KiB / 0x75000 0x080000
OTA2 Image ota2 0x080000 468 KiB / 0x75000 0x0F5000
LibreTiny Storage kvs 0x0F5000 16 KiB / 0x4000 0x0F9000
User Data userdata 0x0F9000 28 KiB / 0x7000 0x100000
(reserved) - 0x100000 1020 KiB / 0xFF000 0x1FF000
RDP rdp 0x1FF000 4 KiB / 0x1000 0x200000