LSC LMA35 BK7231T

by Unknown

Info & flashing guide

Parameter	Value
Board code	`lsc-lma35-t`
MCU	BK7231T
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 v4.2

Usage

Board code: lsc-lma35-t

In platformio.ini:

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

In ESPHome YAML:

bk72xx:
  board: lsc-lma35-t

Pinout

Pin functions

Name(s)	UART	I²C	PWM
P0	TX2	SCL2
P1	RX2	SDA2
P6			PWM0
P7			PWM1
P8			PWM2
P9			PWM3
P10	RX1
P11	TX1
P14
P16
P21
P22
P23, ADC3
P24			PWM4
P26			PWM5

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 / 0x121000	0x132000
OTA Image	0x132000	664 KiB / 0xA6000	0x1D8000
Key-Value Store	0x1D8000	32 KiB / 0x8000	0x1E0000
Calibration	0x1E0000	4 KiB / 0x1000	0x1E1000
TLV Store	0x1E1000	4 KiB / 0x1000	0x1E2000
Network Data	0x1E2000	4 KiB / 0x1000	0x1E3000
User Data	0x1E3000	116 KiB / 0x1D000	0x200000
Tuya Storage	0x1ED000	76 KiB / 0x13000	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.