> For the complete documentation index, see [llms.txt](https://docs.ifreeq.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ifreeq.com/faqs/device-development/untitled-2/wi-fi-chip-sdk.md).

# Wi-Fi Chip SDK

## How many resources does the 8266 SDK require?

16K RAM，400K Flash

## There is no pre\_App\_init when compiling the SDK provided by Tuya?

Just define a pre\_app\_init empty function in the application code

## Why did the SDK provided by Tuya fail to compile?

You need to compile in root mode, please provide logs to Tuya for analysis if it still fails to compile.

## How many bits are the SDK compilation environment toolchain provided by Tuya?

64-bits

## What are the SDK compilation environment requirements provided by Tuya?

64-bits Linux environment

## How to close watchdog by ESP8266 SDK?

system\_soft\_wdt\_stop ()

## Why does Espressif SDK provided by Tuya have 2 bin files after compilation, which one is used?

Use the bin file end with (1)

## How many timers does the ESP8266 SDK have?

Two, one hardware timer, one software timer

## What should I pay attention to when developing pointers for ESP8266 SDK?

The memory must be read with a 4-byte pair. When converting the pointer, make sure that it is a 4-byte pair. Otherwise, the conversion will fail and it cannot be used.

## Why there is no main function in ESP8266 SDK, and what is the program entry function?

app\_init is the program entry function

## Does the SDK provided by Tuya use RTOS?

No, we use FreeRTOS.

## What is the operable address of flash when Tuya 8266 SDK is developed?

Tuya has divided the Flash area, customers can develop directly.

## How to locate the issue when Fatal error appears in the log printed?

You can find the corresponding address in the (\*.S) file and add printing to locate the problem. Fatal exception (28): epc1=0x4025bfa6, epc2=0x00000000, epc3=0x00000000, excvaddr=0x0000000f, depc=0x00000000 For example, if user1.bin is used, you can find the address 0x4025bfa6 in user1.S and check out the corresponding function.

## Which function is used to reset the network status for secondary development with Wi-Fi SDK?

Call the function VOID tuya\_dev\_reset\_factory(VOID), you can restore the factory settings or switch between the two network distribution status.

## Which version is the security baseline based on?

Greater or equal to 5.42 baseline

## With Wi-Fi SDK secondary development, what parameters can I choose to set the Wi-Fi configuration mode?

Normal mode: WCM\_OLD, Low power consumption mode: WCM\_LOW\_POWER, Special distribution mode: WCM\_SPCL\_MODE, Compatibility mode: WCM\_OLD\_CPT

## How to download secondary development files compiled by Wi-Fi SDK to the chip?

Combine several files into a complete package and burn it with Espressif burning tool

## Which function is used to test IO for secondary development with Wi-Fi SDK??

You can use the callback function gpio\_func\_test(VOID).

## Which function is used to get Wi-Fi network status for secondary development with Wi-Fi SDK?

Call the function of GW\_Wi-Fi\_STAT\_E tuya\_get\_wf\_status(VOID), the returned parameters can be compared with GW\_Wi-Fi\_STAT\_E structure

## Which function is used to get the device status for secondary development with Wi-Fi SDK?

Call the GW\_STAT\_E tuya\_get\_gw\_status(VOID) function against the GW\_STAT\_E structure

## Which function of the demo program is easy to start with in the Wi-Fi SDK for secondary development?

The application entry function of our SDK is OPERATE\_RET device\_init(VOID)

## What do I need to prepare for secondary development based on Wi-Fi SDK?

You need to build a VM, a compiler and have to be familiar with the secondary development documents

## How are the 8285 chip high-temperature and low-temperature versions different?

They apply to different working temperatures.

## Does 8266 development support online simulation?

Yes. Tuya can provide a commissioning assistant to commission the module.