Generic - BK7238 (Tuya T1)
by Generic - product page
| Information | |
|---|---|
| Board code | generic-bk7238-tuya |
| MCU | Beken BK7238 |
| Series | BK72XX |
| Partition layout | Tuya default for T1/BK7238 (dynamic OTA, RF 0x1E3000) |
| Encryption keys | -- no encryption -- |
| Specifications | |
| Frequency | 120 MHz |
| Flash size | 2 MiB |
| RAM size | 256 KiB |
| Voltage | 3.0V - 3.6V |
| I/O | 19x GPIO, 6x PWM, 2x UART, 6x ADC |
| Wi-Fi | 802.11 b/g/n |
| Bluetooth | BLE v5.2 |
Usage
Board code: generic-bk7238-tuya
In platformio.ini:
In ESPHome YAML:
Quick flashing guide
| Pin | Connection |
|---|---|
| P10 / RX1 | TX of USB-UART adapter |
| P11 / TX1 | RX of USB-UART adapter |
| CEN (Chip-Enable) | GND to reset the chip |
- Connect the USB-UART adapter.
- Start the flashing process.
- Keep shorting CEN to GND or power-cycling the device, until flashing starts.
Pin functions
| Name(s) | UART | IĀ²C | SPI | PWM | Other |
|---|---|---|---|---|---|
| P0 | TX2 | ||||
| P1, ADC5 | RX2 | ||||
| P6 | PWM0 | TCK | |||
| P7 | PWM1 | TMS | |||
| P8 | PWM2 | TDI | |||
| P9 | PWM3 | TDO | |||
| P10, ADC6 | RX1 | ||||
| P11 | TX1 | ||||
| P14 | SCK | ||||
| P15 | SCL2 | CS | |||
| P16 | MOSI | ||||
| P17 | SDA2 | MISO | |||
| P20, ADC3 | |||||
| P21 | |||||
| P22 | |||||
| P23 | |||||
| P24, ADC2 | SCL2 | PWM4 | |||
| P26, ADC1 | SDA2 | PWM5 | |||
| P28, ADC4 |
Flash memory map
Flash size: 2 MiB / 2,097,152 B / 0x200000
Hex values are in bytes.
| Name | Code | Start | Length | End |
|---|---|---|---|---|
| Bootloader | bootloader |
0x000000 | 68 KiB / 0x11000 | 0x011000 |
| App Image | app |
0x011000 | 1.1 MiB / 0x11B000 | 0x12C000 |
| OTA Image | download |
0x12C000 | 724 KiB / 0xB5000 | 0x1E1000 |
| OTA Info (Tuya) | diff2ya |
0x1E1000 | 4 KiB / 0x1000 | 0x1E2000 |
| (reserved) | - | 0x1E2000 | 4 KiB / 0x1000 | 0x1E3000 |
| Calibration | calibration |
0x1E3000 | 4 KiB / 0x1000 | 0x1E4000 |
| LibreTiny Storage | kvs |
0x1E4000 | 32 KiB / 0x8000 | 0x1EC000 |
| User Data | userdata |
0x1EC000 | 80 KiB / 0x14000 | 0x200000 |
| Tuya Storage | tuya |
0x1F5000 | 44 KiB / 0xB000 | 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.