LSC LMA35

by Unknown

Parameter	Value
Board code	`lsc-lma35`
MCU	BK7231N
Manufacturer	Beken
Series	BK72XX
Frequency	120 MHz
Flash size	2 MiB
RAM size	256 KiB
Voltage	3.0V - 3.6V
I/O	15x GPIO, 6x PWM, 2x UART, 1x ADC
Wi-Fi	802.11 b/g/n
Bluetooth	BLE v5.1

Usage

Board code: lsc-lma35

In platformio.ini:

[env:lsc-lma35]
platform = libretuya
board = lsc-lma35
framework = arduino

In ESPHome YAML:

libretuya:
  board: lsc-lma35
  framework:
    version: dev

Pinout

Arduino Core pin mapping

No.	Pin	UART	I²C	SPI	PWM	Other
D0	P26				PWM5
D1	P14			SCK
D2	P16			MOSI
D3	P24				PWM4
D4	P22					TDI
D5	P0	UART2_TX	I2C2_SCL
D6	P23					TDO
D7	P8				PWM2
D8	P9				PWM3
D9	P21		I2C1_SDA			TMS
D10	P6				PWM0
D11	P7				PWM1
D12	P10	UART1_RX
D13	P11	UART1_TX
D14	P1	UART2_RX	I2C2_SDA
A0	P23, ADC3

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

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.

Information

This board has no marking on the front side, only something that looks like PCB manufacturing info on the back; thus it was named based on these symbols.

It can be found in 'LSC Smart Connect Outdoor LED Strip', and is likely custom-made for this product.

The pinout was established by writing to and probing consecutive GPIOs, using the generic board definition.

Pins marked with '?' are currently unknown, with a possibility of being CEN. Pin 22 (P1/D14) is also not confirmed.