Name: Espressif Systems ESP
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ESP-FAQ is a summary document of frequently asked questions released by Espressif. This repository aims to help

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FAQ cover: development environment, application solution, software framework, hardware related and test

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Table of Contents2
Instruction20
Question Search20
Question Search Techniques20
Question Classification Categories21
Document Contribution21
Commit Process21
Create a New Branch21
Branch Naming Conventions22
Q&A Guidelines22
Local Build Environment23
Commit Message Standards24
Submit a Merge Request24
Development Environment26
IDE Plugins26
How to Add ESP32 Development Board on Arduino IDE26
When Using the Arduino IDE Development Platform, How to Read the MAC Address of the Wi-Fi that Comes with ESP3226
Debugging26
How to Use the Flash Download Tool to Flash the bin File Generated by Arduino to ESP3226
What Is the Serial Port Name of ESP Devices27
How to Block Debugging Messages Sent through UART0 by Default in ESP3227
How to Modify the Default Method of RF Calibration in ESP3227
How to Modify the Default Method of RF Calibration in ESP826627
How to Troubleshoot in ESP32 Boot Mode28
When Debugging with ESP32 JLINK, an ERROR Occurs As: no Symbols for Freertos28
How Can I Resolve such Issue28
How to Monitor the Free Space of the Task Stack28
Is It Possible to Use JTAG to Debug with ESP32-S228
How to Modify the Log Output Without Changing the Output Level of Menuconfig28
ESP8266 Enters Boot Mode (2,7) and Hits a Watchdog Reset. What Could be Wrong29
When Using the ESP-WROVER-KIT Board with Openocd, an Error Occurred As: Can't29
Find Board/Esp32-Wrover-Kit-3.3V.cfg. How Can I Resolve such Issue29
The Rtc_Watch_Dog Keeps Resetting During ESP32 SPI Boot. What Could be the Reason29
How to Obtain and Parse Coredump with ESP3229
How to Do RF Performance Test with ESP32, ESP8266, and ESP32S230
My PC Cannot Recognize the Device Connected in Win10 System. What Could be the Reason30
One Error Occurred with ESP32 As: Core 1 Paniced (Cache Disabled but Cache Memory Region Accessed). What Could be the Reason30
How to Read the Flash Model Information of the Modules30
How Can I Resolve such Issue30
I Found a "Brownout Detector was Triggered"Failure on My ESP32. How to Resolve such Issue31
After Imported the Protocol_Examples_Common.h Header File, How Come It Cannot be Found While Compling31
When Using ESP8266 Nonos V3.0 SDK, the Following Error Occurred. What Could be the Reason31
Environment Setup31
When Setting up ESP32-S2 Environment Using Command Idf.py Set-Target31
Be the Reason31
When Installing ESP-IDF Version Master Using ESP-IDF Tools 2.3 in Windows System, an Error Occurred As: Installation Has Failed with Exit Code 2. What Could be the Reason32
When Setting up Environment Using Esp-Idf-Tools-Setup-2.3.Exe on Windows, Errors Occurred When Make Menuconfig Is Executed32
When Using Esp-Idf-Tools-Setup-2.2.Exe in Windows System, a Python Error Occurred During the Installation32
What Should I Do if I Get Download Failed: Security Channel Support Error When Installing Build Environment in the Windows System32
When Executing Export.bat in Windows System, What Should I Do if I Get Cmake and Gdbgui Version Errors32
Errors Occurred When Using Idf.menuconfig and Idf.build after Updating the ESP- IDF Version from V3.3 to the Latest One33
How to Configure PATH and IDF_PATH When Developing ESP32 and ESP8266 Simulta- Neously33
Do I Need to Use Command Idf.py Set-Target Every Time When Switching to Another Project33
How to Know the Version of ESP-IDF, Is It Recorded in a Certain Document34
How to Optimize ESP-IDF Compilation in Windows Environment34
Is There an Esptool that Can be Used Directly on Windows34
Firmware Update34
How Does the Host MCU Flash ESP32 Via Serial Interfaces34
How to Download Firmware for ESP32 Series Modules Using the USB-Serial Tool34
How to Flash Firmware in Macos and Linux Systems35
Does ESP32 Support Programming Using JTAG Pins Directly35
Does Esp_Flash_Downloader_Tool Support Customized Programming Control35
Can I Enable the Security Boot Function for ESP32 Via OTA35
How to Resolve the Following Error Occured When Flashing Firmware to ESP32-S2 Based on35
ESP-IDF V4.136
How to Download Firmware Based on ESP-IDF Using Flash_Download_Tool36
What Is the Communication Protocol for Flashing ESP Chips36
How to Program ESP32-C3'S Firmware Offline36
How Does ESP32 Set Flash SPI to QIO Mode36
After Downloading Program and Powering on EPS8266, the Serial Port Printed the Following Log. What Is the Reason36
What Are the Espressif Module Programming Tools37
What Is the Difference between the Factory Mode and Developer Mode of the Flash Download Tool37
Why Does the Programming Failed for the Jig with a 4-Port Hub in Factory Mode37
Succeeded When Replacing the Module with ESP32-WEOVER-E, What Is the Reason37
The Encrypted Device Cannot be Re-Flashed Via the Flash Download Tool. What Could be the38
When Updating ESP32 Firmware through UART Interface Based on Esptool Serial Port Pro38
Messages. What Could be the Reason38
Why Does My USB Driver Failed to be Recognized by the Windows7 System38
After Using the ESP32-WROVER-E Module to Download the Program, the Following Log Is Printed after Powered On. What Could be the Reason38
When Using the Flash Download Tools to Flash ESP32-C3 Via USB, 8-Download Data Fail Occurs Repeatedly. How Can I Solve It38
Application Solution40
Android Application40
Artificial Intelligence40
What Types of Cameras Are Supported on AI Image Recognition Products40
Which Versions of ESP-IDF Are Supported by ESP-WHO40
Is There any Information about the Wechat Mini Program of ESP-EYE40
What Languages Are Supported by the Esp-Skainet Demo40
What Model Frameworks Does ESP-DL Support41
Does ESP-DL Support All Models of the Three Platforms Mentioned above (Mxnet, Pytorch, and Tensorflow)41
Can the Model Files of ESP-SKAINET be Stored in the SD Card41
How to Customize Command Words in ESP-SKAINET41
How to Reduce the System Footprint of AI Speech Models41
What Is the Difference between a 16-Bit Quantization Model and an 8-Bit Quantization Model41
How Does the AI Voice Model Modify the Number of Microphone Channels41
How Do I Get the Actual Audio Captured in the Development Board41
Do You Have Relevant Study Materials for ESP-SR Github42
Do You Have Relevant Study Materials for ESP-DL42
How Does ESP32-S3 Customize English Command Words for Recognition42
Audio Development Framework42
What Is the Maximum Power of Supported Speakers for ESP32 Series Audio Development Board42
Does Alexa Solution Have Certain Requirements for Environmental Noise42
There Is an aux Input on the ESP32 AI Development Board, Can MIC be Used to Pick up the Sound42
When Using ESP32-WROVER-B Module + ES8311 to Design Audio Development Board, Which Pins Can be Selected for MCLK Clock43
Can ESP32-WROVER-E Module Use One I2S Line to Realize Simultaneous Broadcasting and Recording43
Do Espressif Modules Support Spotify Connect43
When Running the Korvo_Du1906 Example on an ESP32-Korvo-DU1906 Board, a Reboot Caused the Following Error Message: Guru Meditation Error: Core 0 Panic'ed43
Struction). Exception was Unhandled. How to Resolve such Issue43
Can ESP-DSP Fft Run 4096, 8192 and more Samples44
How to Connect a Microphone with ESP3244
Does ESP32 Support Analog Audio Output or Digital Audio Output44
What Audio Formats Does the ESP32 Chip Support44
How to Use the ESP32 Chip to Decode Compressed Audio44
Where Is the Code Example for ESP-LED-Strip44
Does ESP32 Support Online Voice Recognition44
BLE Mesh Development Framework44
What Is the Maximum Data Transmission Load for Bluetooth® le (BLE) Mesh45
Could You Provide an Example of Networking through ESP32 BLE-Mesh? What APP Can be Used for BLE-Mesh Networking45
For Unprovisioned Device in BLE-MESH, the Default Name Is ESP-BLE-MESH, How to Modify this Name45
How Many Node Devices Can Esp32'S BLE-MESH Application Connect to45
How Can I Manually Reset a BLE Mesh Device Without the Mobile Provisioning App or Provisioning Device45
Can Wi-Fi be Used with ESP-NOW at the same Time52
How Do I Set the Rate at Which ESP-NOW Data Is Sent52
ESP-NOW Allows Pairing with a Maximum of 20 Devices. Is There a Way to Control more Devices52
What Is the Maximum Number of Devices that Can be Controlled by ESP-NOW52
Do I Need to Connect a Router for Communication between ESP-NOW Devices53
Why Does ESP-NOW Limit the Data Length of each Packet to 250 Bytes? Can It be Configured53
What Should I Pay Attention to When Using ESP-NOW Applications53
How Can I Reduce Power Consumption When Using ESP-NOW53
In Addition to Wireless Communication through ESP-NOW, Is There any Other Better Way to Realize One-To-One and One-To-Many Communication53
Do ESP-NOW Applications Support Sending Packets over each Wi-Fi Channel54
Are There any Special Procedures Required if I Intend to Use ESP-NOW for Commercial54
Rameters Including CSMA/CA, Modulation Method, and Bit Rate54
I Tested the Application Esp-Idf/Examples/Wifi/Espnow Using ESP32. Does It Only Support Connecting to 7 Encrypted Devices at the Maximum54
ESP Rainmaker Cloud Service54
Ios Application54
Third Party Cloud Service54
Are There any Examples for OTA Upgrading54
Does ESP Azure Library Support Azure Iot Central? Is There an Example55
What Should I Do to Connect ESP32 to Alibaba Cloud Via ESP32 + Ethernet + MQTT55
What Do Alexa LED States Indicate55
ESP-WIFI-MESH Development Framework55
What Is the Maximum Data Transmission Load for Wi-Fi Mesh55
Does Esp32'S Wi-Fi Mesh Supports no Router Self-Networking55
What Is the Maximum Number of Node Layers Allowed When ESP32 Uses Wi-Fi Mesh55
When Using an ESP32 Development Board to Test the Esp56
The Router, the Device Name in Connection Is "Espressif". How to Modify this Name56
Can Wi-Fi Mesh Send Messages to Specific Nodes Via TCP Server56
During the Operation of the ESP32 Wi-Fi Mesh Network, if the Root Node Is Lost, What Events will the System Report Back56
But the Server DID Not Receive any Data. How to Transfer Data from Leaf Nodes to External Servers56
How Do I Upgrade My ESP-MESH Device Via OTA after Networking56
Can You Provide ESP-MESH Light Reference Design56
What Is the Default Mode for ESP-MESH Nodes Without any Configuration57
ESP-MESH Starts with AP+STA Mode Enabled, Can the Phone Search for Aps57
Do I Need to Rescan for All the Newly Added Devices When the Original Device Has Already Been Networked57
When Using an ESP32 as a Master Device to Synchronize Time for Multiple Slave Devices, Can the Time Error be Less than 2 Ms57
How Do I Get the Type of the Node in ESP-MESH57
Is There any Demo of ESP-Mesh Root Node Sending Messages to a Service Via Ethernet57
Does the Esp-Mesh-Lite Solution Support the Applications Without Routers57
When Esp-Wifi-Mesh Is Already Networked, Does the Root or Node Device Can also Enable Wi-Fi Scan to Scan Surrounding Available AP Information58
How Can I Switch to a New Router for Networking When Using the Esp-Wifi-Mesh Router Solution58
Software Framework60
Bluetooth le & Bluetooth60
When Porting Example Gatt_Server, an Error Occurred Indicating Head File Does Not Exist60
What Could be the Reasons60
Does ESP32 Support Bluetooth 5.060
After the Bluetooth® le Starts Advertising, Why some Mobile Phones Cannot Successfully Scan Them60
Can I Process OTA through Bluetooth® on ESP3261
How Do ESP32 Bluetooth® and Bluetooth® le Dual-Mode Coexist and How Can I Use this Coexistence Mode61
What Is the Throughput of ESP32 Bluetooth® le61
Does ESP32 Support Bluetooth® 4.2 DLE (Data Length Extension)61
How Do ESP32 Bluetooth® and Wi-Fi Coexist61
How Can I Get ESP32 Bluetooth® Compatibility Test Report61
What Is the Transmit Power of ESP32 Bluetooth62
Could ESP32 Realize Bridging between Wi-Fi and Bluetooth® le62
What Is the Operating Current of ESP32 Bluetooth® le62
What Kinds of Bluetooth® le Profiles Does ESP32 Support62
How Do I Connect Mobile Phones and Play Music Using ESP32 Bluetooth62
How Is the ESP32 SPP Performance62
What Is the Maximum Transmission Rate for ESP32 Bluetooth® le63
How Does ESP32 Bluetooth® le Enter Light-Sleep Mode63
Are There any Documentation References for ESP32 Blufi Networking63
What Is the Maximum Transmission Rate for ESP32 Classic Bluetooth® SPP63
Is ESP32 Bluetooth® Compatible to Bluetooth® Ver2.1 + EDR Protocol64
How Many Bluetooth® Clients Can be Connected to ESP3264
How Can I Get the MAC Address of Bluetooth® Devices for ESP3264
What Is the Default Bluetooth® Transmit Power for ESP32 SDK64
Is It Possible to Use Wi-Fi Smartconfig and Bluetooth® le Mesh for ESP32 Simultaneously64
What Is the Operating Current for ESP32 Classic Bluetooth64
How Can I Modify the Transmit Power for ESP32 Bluetooth65
How Is the Networking Compatibility of ESP32 Bluetooth® LE? Is It Open-Sourced65
When I Execute Example Bt_Spp_Acceptor on ESP32, the IOS Device Cannot Find the ESP32 Device During Scanning. What Could be the Reasons65
How Is the Security of ESP32 Bluetooth® Le/Bluetooth® Secure Simple Pairing (SSP)65
Compared to Legacy Pairing65
How Can I Confirm the MTU Size of ESP32 Bluetooth® le65
When Advertising in ESP32 Bluetooth® le Mode, an Error Occurred as "W (17370) BT_BTM: Data Exceed Max Adv Packet Length". How Can I Resolve such Issue65
Does ESP32 Bluetooth® le Support Client-Server Mode, in Which Gatt Server and Gatt Client Can Coexist66
What Are the Risks if There Are over Six Devices Connected to ESP32 Bluetooth® le66
When Using ESP32 Device as the Server of Bluetooth® LE, How Many Client Devices Can66
Be Connected66
How Can I Send Files Via Bluetooth® BR/EDR for ESP3266
When I Download Example ESP_SPP_SERVER for ESP32, How Can I Modify the Name66
Of the Bluetooth® Device66
When I Use the "Blufi"Example to Configure Network for ESP32, the Wi-Fi Cannot be67
The Application. What Is the Reason67
How Can I Specify a BLE Connection/Transmit Operation to Run on Core 0 When I Use ESP3267
When I Set Name for the Bluetooth of an ESP32 Device Using Chinese Characters, Messy Code Shows Instead. What Is the Reason67
In One Packet, or Are There Other Solutions to Increase the Transmission Rate67
What Profile Does Esp32'S Classic Bluetooth® Support68
How Many Stable Connections Can be Reached for ESP32-C3'S Bluetooth® le (BLE)68
How Can I Adjust the BLE Advertising Interval68
How Can I Input the PIN Code Via Mobile Phone During ESP32' S Classic Bluetooth Pairing68
How Much Memory Does ESP32 Bluetooth Occupy68
When I Use the "Gattc_Gatts_Coex.C"Example on ESP32 to Test BLE Multi-Connection69
Menuconfig to Five. What Is the Reason69
Does ESP32-C3 BLE Support Master and Slave Mode at the same Time? What Is the Number69
Of Connections in Master Mode and Slave Mode69
What Is the Maximum MTU Size of ESP32 Classic Bluetooth69
How Can I Resolve the Frequently Occurred Elxxx Error (such as Elx200) When Wi-Fi and69
Ble Co-Exit69
How Does BLE Capture Packets69
When I Use an ESP32 Development Board to Test Several Versions of Bluefi Example under70
ESP-IDF for Networking, the Following Error Kept Printing. What Is the Reason70
When I Use ESP32, Can Light-Sleep Mode be Enabled for Bluetooth and Can Bluetooth be70
Kept Connected in Light-Sleep Mode70
How Can I Modify the Bluetooth Device Name of ESP3270
What Is the Maximum Supported Broadcast Length of BLE 5.0 Broadcast after It Is Set to Legacy Mode71
How Can I Set a BLE Broadcast Package as Unconnectable Package71
How Can I Send Bluetooth HCI Commands Directly to ESP32-WROOM-32D Module through the Serial Port71
Does ESP32 Support Transmitting Audio Stream Using A2DP71
How Many Devices Can be Connected at the most as Suggested by the White List of ESP32 Bluetooth le71
Can ESP32 Bluetooth le Use PSRAM71
When Using ESP32-C3 BLE Scan, Can I Set It to Only Scan the Long Range Devices72
Is There a Limit to the Name Length of ESP32 as a Bluetooth Device72
How Do I Set the ESP32 BLE Scan to the Permanent Scan Without Generating a Timeout72
How Can I Get RSSI of BLE Devices through ESP3272
How Can I Increase the Transmission Distance of BLE5.0? How Can I Set BLE5.0 to Long- Range Mode72
However, It Does Not Work on IOS Devices. the Device Name Is Still the Default Bluetooth Name. How Can I Make It Work on Apple Devices as Well73
I Want to Use Two ESP32 Development Boards to Test the Bluetooth Connection. How Can I Set the Specified Key to Automatically Connect Them with Gatt_Security_Client and73
Gatt_Security_Server Examples73
After Setting Gatt_Security_Server to ESP_IO_CAP_OUT Mode and Setting73
However, the Two Development Boards Can Still be Connected. What Is the Reason73
Does ESP32-C3/ESP32-C6/ESP32-S3 Support Bluetooth AOA/AOD73
What Is the Maximum Length of Data in a BLE Advertising Packet Supported by ESP32-C374
With the BLE5.0 Feature74
Does ESP32 Have any API to Check Whether BLE Advertising Has Started or Stopped74
Ethernet74
When Building an Example on ESP32 Ethernet Development Board, an Error Occurred as "Emac: Reset EMAC Timeout". What Could be the Reasons74
When ESP32 Connected to LAN8720 Externally, with GPIO0 Providing CLK, the Initialization of Ethernet Example Failed. How to Resolve such Issue74
When Using the Ethernet Example in ESP-IDF, an Error Occurred as "Timed out Waiting75
Resolve such Issue75
When Using ESP-IDF V4.1, How to Set the Static IP for ESP32 Ethernet75
Is There any Impact on Ethernet Functionality if Replacing the Module of ESP32-Ethernet-Kit with ESP32-WROOM-32D76
When Using ESP32 to Design a Self-Developed Ethernet Board, after Downloaded the Official Esp-Idf/Examples/Ethernet Example, Errors Are Reported as Follows, What Is the Reason76
When Ethernet and Wi-Fi Co-Exist, Is Ethernet Prioritized to Transfer Data77
Does ESP32 Ethernet Support MII Interface77
Is It Possible to Connect ESP32-S2 to Ethernet Externally77
Do the ESP32 Series Chips Support to Use EMAC and SPI-Ethernet Modules Simultaneously77
Coexistence77
When Wi-Fi Coexists with Bluetooth, What Mode Does It Support77
When Wi-Fi Coexists with ESP-BLE-MESH, the Wi-Fi Throughput Is Low, Why78
Does ESP32 Support Coexistence between ESP-WIFI-MESH and Bluetooth® le Mesh78
Does ESP32 Support Coexistence between Bluetooth® and Wi-Fi78
When Wi-Fi, Bluetooth® LE, and A2DP Sink Coexist, Audio Data Reception Is Lost and Lagged While Entering Bluetooth le Scanning. How to Resolve such Issue78
Can BLE Advertising (Connectable) and Ibeacon Sending (Advertising) Coexist78
Peripherals79
Analog-To-Digital Converter (ADC)79
Digital-To-Analog Converter (DAC)82
Gpio & Rtc Gpio82
Inter-Integrated Circuit (I2C)84
Inter-IC Sound (I2S)85
Lcd86
LED Control (LEDC)89
Motor Control Pulse Width Modulator (MCPWM)90
Pulse Counter (PCNT)90
Remote Control Transceiver (RMT)91
Secure Digital Input Output (SDIO)93
Serial Peripheral Interface (SPI)94
Timer97
Touch Sensor97
Two-Wire Automotive Interface (TWAI)98
Universal Asynchronous Receiver/Transmitter (UART)98
Usb101
Other Peripherals106
Protocols107
Esp-Tls107
Http108
Lwip109
Mbed TLS116
Mqtt117
Other Protocols119
Provisioning121
Can I Add any Broadcast Data I Want to Android ESP-Touch (E.g., Add a Device ID so that ESP32 Can Receive this ID)121
Security121
Is the Firmware in ESP8266 Readable121
Is It Possible to Encrypt Firmware for ESP8285122
What Is the Difference between Secure Boot V1 and V2122
After Enabling Secure Boot, There Is a Build Error Indicating Missing Files. What Could be the Reasons122
After Enabling Secure Boot, Is It Possible for Modules to be Flashed Again122
With Flash Encryption Enabled, a Module Reports an Error as Flash Read Error after Reflashed. How to Resolve such Issue122
After Enabling Flash Encryption and Secure Boot for ESP32, How to Disable Them123
Is There any Security Strategy for ESP32 to Protect Its Firmware123
When ESP32 Debugging GDB after Enabling Flash Encryption, Why Does It Continuously Reset and Restart123
How to Enable Flash Encryption for ESP32123

Espressif Systems ESP User Manual

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Espressif Systems ESP Specifications

Brand	Espressif Systems
Model	ESP
Category	Motherboard
Language	English