Bluetooth LE–PHY6222

This topic describes the basics of the chip platform used in TuyaOS development. For more information, visit Tuya Developer Forum.

Hardware environment

Datasheet

The datasheet can be found in hardware\PHY6222\chip_manual\PHY6222_BLE_SoC_Datasheet_v1.2_20210430.pdf.

Development board

Phyplus official PHY6222 development board is used. You can purchase the board from Phyplus.

Or, purchase it (part number: 1.15.17.00173) from the Tuya Developer Platform.

Peripherals

UART

This platform has two UARTs. UART0 is used for log output. UART1 is used for flashing, authorization, and debugging.

UART	Feature	Pin	Remarks
UART0	TX	P2	Log
UART0	RX	P0
UART1	TX	P9	Flashing, authorization, and testing.
UART1	RX	P10

SPI

This platform has two SPI buses.

SPI	Feature	Pin
SPI0	CS	P32
SPI0	CLK	P31
SPI0	SDI	P18
SPI0	SDO	P20
SPI1	CS	P14
SPI1	CLK	P15
SPI1	SDI	P33
SPI1	SDO	P34

I2C

This platform has two I2Cs. To display SDK information (TuyaOS demo), the OLED is pre-initialized. Therefore, only one I2C can be used for testing.

I2C	Feature	Pin
I2C0	SCL	P24
I2C0	SDA	P23

PWM

Channel	Pin
0	P31
1	P32
2	P26
3	P33
4	P34
5	P7

ADC

Only support 12-bit resolution.

Voltage value is returned.

Channel	Pin
0	P11
1	P23
2	P24
3	P14
4	P15
5	P20

Key control

P7

• Press the button to wake up the device.

• Press and hold the button for three seconds to factory reset the device.

Power-on detection pin

P1

Set this pin to high after entering the main function.

Software environment

Keil

1. Download Keil from the Arm Keil website. mdk528a.exe is recommended. During installation, keep all the default settings.

2. If you are prompted to install a driver, continue with Install.

3. When opening Keil, if you are prompted to install a software pack, close the window.

4. After Keil is installed, add the path of the UV4.exe file to the environment variable. For example: TUYAOS_COMPILE_TOOL: C:\Keil_v5\UV4, as shown below.

   

Develop software

Enable scanning

HOST_CONFIG=6

Flash and RAM footprint

1. Disable the testing feature.

   #define TUYA_SDK_TEST 0
   

2. Disable logging.

   #define ENABLE_LOG 0
   #define BOARD_ENABLE_LOG 0
   

3. Disable scanning.

   HOST_CONFIG=4
   

4. After a full compilation of the whole project, open the .map file. You will get the following screen.

   • The flash footprint:
   
   • The RAM footprint:
   

   • The free RAM:

     • = 0x1fffffff − (0x1fffaa00 + 0x00001000)
     • = 17919 bytes
     • = 17.5 KB

When you enable scanning

HOST_CONFIG=6

After a full compilation of the whole project, open the .map file. You will get the following screen.

• The flash footprint:

  

• The RAM footprint:

  

  The free RAM:

  • = 0x1fffffff − (0x1fffceb8 + 0x00001000)
  • = 8519 bytes
  • = 8.3 KB

Calculate free RAM

Some Phyplus code might be stored in RAM. Therefore, The free RAM we calculate may vary from the one provided in the .map file. Here is how to calculate the free RAM.

1. Open the .map file.

2. Find the Memory Map of the image section.

3. Navigate to the end of the section and check the last line, as shown below.

   

   The free RAM is calculated by: 0x1fffffff − (0x1fffceb8 + 0x00001000)

   Quickly locate: LR_ROM_JT_GC

Firmware flashing

Wire connection

To flash firmware to the device, connect the device and the USB to TTL converter as described below.

USB to TTL converter	Device
VCC	VCC
GND	GND
TX	RX
RX	TX

Firmware description

Flashing method

Open the flashing tool from pc\tools\PHY6222.

1. Connect the device to the computer through a USB to TTL converter.

   

2. Serial port is connected.

   

3. Import the firmware binary file and proceed with erasing and writing.

   

Features

Startup time

• Use a logic analyzer to measure the signal time difference between the VCC pin and the startup time detection pin.

• Detection pins: peripheral → startup time detection pin

  

Flash partition

Adjust flash partitions

In the original project, you can modify the following macros to adjust the default flash partitions.

// Flash
#ifndef BOARD_FLASH_BULK_DATA_START_ADDR
#define BOARD_FLASH_BULK_DATA_START_ADDR        (0x4C000)
#endif

#ifndef BOARD_FLASH_TUYA_INFO_START_ADDR
#define BOARD_FLASH_TUYA_INFO_START_ADDR        (0x50000)
#endif

#ifndef BOARD_FLASH_OTA_INFO_ADDR
#define BOARD_FLASH_OTA_INFO_ADDR               (0x54000)
#endif

#ifndef BOARD_FLASH_OTA_START_ADDR
#define BOARD_FLASH_OTA_START_ADDR              (0x55000)
#endif

#ifndef BOARD_FLASH_OTA_END_ADDR
#define BOARD_FLASH_OTA_END_ADDR                (0x80000)
#endif

#ifndef BOARD_FLASH_OTA_SIZE
#define BOARD_FLASH_OTA_SIZE                    (BOARD_FLASH_OTA_END_ADDR - BOARD_FLASH_OTA_START_ADDR)
#endif

To change the OTA memory location, besides editing the above macro, you also need to edit the bootloader project accordingly.

1. Open the bootloader project from \vendor\phy6222_ble\sdk\phy62xx-sdk-v3\example\OTA\slboot.

2. Edit SLB_EXCH_AREA_BASE and SLB_EXCH_AREA_SIZE and then compile the bootloader project.

   

Power consumption

Measure the average power consumption of typical one-second advertising.

Power consumption in sleep mode is 13 μA.

RTC precision

• Normal operation mode: The time drift is less than two seconds within 20 hours.

• Sleep mode: The time drift is about eight seconds within in 11 hours.