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Espressif Systems ESP User Manual
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Chapter
7.
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Table of Contents
Table of Contents
2
Instruction
20
Question Search
20
Question Search Techniques
20
Question Classification Categories
21
Document Contribution
21
Commit Process
21
Create a New Branch
21
Branch Naming Conventions
22
Q&A Guidelines
22
Local Build Environment
23
Commit Message Standards
24
Submit a Merge Request
24
Development Environment
26
IDE Plugins
26
How to Add ESP32 Development Board on Arduino IDE
26
When Using the Arduino IDE Development Platform, How to Read the MAC Address of the Wi-Fi that Comes with ESP32
26
Debugging
26
How to Use the Flash Download Tool to Flash the bin File Generated by Arduino to ESP32
26
What Is the Serial Port Name of ESP Devices
27
How to Block Debugging Messages Sent through UART0 by Default in ESP32
27
How to Modify the Default Method of RF Calibration in ESP32
27
How to Modify the Default Method of RF Calibration in ESP8266
27
How to Troubleshoot in ESP32 Boot Mode
28
When Debugging with ESP32 JLINK, an ERROR Occurs As: no Symbols for Freertos
28
How Can I Resolve such Issue
28
How to Monitor the Free Space of the Task Stack
28
Is It Possible to Use JTAG to Debug with ESP32-S2
28
How to Modify the Log Output Without Changing the Output Level of Menuconfig
28
ESP8266 Enters Boot Mode (2,7) and Hits a Watchdog Reset. What Could be Wrong
29
When Using the ESP-WROVER-KIT Board with Openocd, an Error Occurred As: Can't
29
Find Board/Esp32-Wrover-Kit-3.3V.cfg. How Can I Resolve such Issue
29
The Rtc_Watch_Dog Keeps Resetting During ESP32 SPI Boot. What Could be the Reason
29
How to Obtain and Parse Coredump with ESP32
29
How to Do RF Performance Test with ESP32, ESP8266, and ESP32S2
30
My PC Cannot Recognize the Device Connected in Win10 System. What Could be the Reason
30
One Error Occurred with ESP32 As: Core 1 Paniced (Cache Disabled but Cache Memory Region Accessed). What Could be the Reason
30
How to Read the Flash Model Information of the Modules
30
How Can I Resolve such Issue
30
I Found a "Brownout Detector was Triggered"Failure on My ESP32. How to Resolve such Issue
31
After Imported the Protocol_Examples_Common.h Header File, How Come It Cannot be Found While Compling
31
When Using ESP8266 Nonos V3.0 SDK, the Following Error Occurred. What Could be the Reason
31
Environment Setup
31
When Setting up ESP32-S2 Environment Using Command Idf.py Set-Target
31
Be the Reason
31
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 Reason
32
When Setting up Environment Using Esp-Idf-Tools-Setup-2.3.Exe on Windows, Errors Occurred When Make Menuconfig Is Executed
32
When Using Esp-Idf-Tools-Setup-2.2.Exe in Windows System, a Python Error Occurred During the Installation
32
What Should I Do if I Get Download Failed: Security Channel Support Error When Installing Build Environment in the Windows System
32
When Executing Export.bat in Windows System, What Should I Do if I Get Cmake and Gdbgui Version Errors
32
Errors Occurred When Using Idf.menuconfig and Idf.build after Updating the ESP- IDF Version from V3.3 to the Latest One
33
How to Configure PATH and IDF_PATH When Developing ESP32 and ESP8266 Simulta- Neously
33
Do I Need to Use Command Idf.py Set-Target Every Time When Switching to Another Project
33
How to Know the Version of ESP-IDF, Is It Recorded in a Certain Document
34
How to Optimize ESP-IDF Compilation in Windows Environment
34
Is There an Esptool that Can be Used Directly on Windows
34
Firmware Update
34
How Does the Host MCU Flash ESP32 Via Serial Interfaces
34
How to Download Firmware for ESP32 Series Modules Using the USB-Serial Tool
34
How to Flash Firmware in Macos and Linux Systems
35
Does ESP32 Support Programming Using JTAG Pins Directly
35
Does Esp_Flash_Downloader_Tool Support Customized Programming Control
35
Can I Enable the Security Boot Function for ESP32 Via OTA
35
How to Resolve the Following Error Occured When Flashing Firmware to ESP32-S2 Based on
35
ESP-IDF V4.1
36
How to Download Firmware Based on ESP-IDF Using Flash_Download_Tool
36
What Is the Communication Protocol for Flashing ESP Chips
36
How to Program ESP32-C3'S Firmware Offline
36
How Does ESP32 Set Flash SPI to QIO Mode
36
After Downloading Program and Powering on EPS8266, the Serial Port Printed the Following Log. What Is the Reason
36
What Are the Espressif Module Programming Tools
37
What Is the Difference between the Factory Mode and Developer Mode of the Flash Download Tool
37
Why Does the Programming Failed for the Jig with a 4-Port Hub in Factory Mode
37
Succeeded When Replacing the Module with ESP32-WEOVER-E, What Is the Reason
37
The Encrypted Device Cannot be Re-Flashed Via the Flash Download Tool. What Could be the
38
When Updating ESP32 Firmware through UART Interface Based on Esptool Serial Port Pro
38
Messages. What Could be the Reason
38
Why Does My USB Driver Failed to be Recognized by the Windows7 System
38
After Using the ESP32-WROVER-E Module to Download the Program, the Following Log Is Printed after Powered On. What Could be the Reason
38
When Using the Flash Download Tools to Flash ESP32-C3 Via USB, 8-Download Data Fail Occurs Repeatedly. How Can I Solve It
38
Application Solution
40
Android Application
40
Artificial Intelligence
40
What Types of Cameras Are Supported on AI Image Recognition Products
40
Which Versions of ESP-IDF Are Supported by ESP-WHO
40
Is There any Information about the Wechat Mini Program of ESP-EYE
40
What Languages Are Supported by the Esp-Skainet Demo
40
What Model Frameworks Does ESP-DL Support
41
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 Card
41
How to Customize Command Words in ESP-SKAINET
41
How to Reduce the System Footprint of AI Speech Models
41
What Is the Difference between a 16-Bit Quantization Model and an 8-Bit Quantization Model
41
How Does the AI Voice Model Modify the Number of Microphone Channels
41
How Do I Get the Actual Audio Captured in the Development Board
41
Do You Have Relevant Study Materials for ESP-SR Github
42
Do You Have Relevant Study Materials for ESP-DL
42
How Does ESP32-S3 Customize English Command Words for Recognition
42
Audio Development Framework
42
What Is the Maximum Power of Supported Speakers for ESP32 Series Audio Development Board
42
Does Alexa Solution Have Certain Requirements for Environmental Noise
42
There Is an aux Input on the ESP32 AI Development Board, Can MIC be Used to Pick up the Sound
42
When Using ESP32-WROVER-B Module + ES8311 to Design Audio Development Board, Which Pins Can be Selected for MCLK Clock
43
Can ESP32-WROVER-E Module Use One I2S Line to Realize Simultaneous Broadcasting and Recording
43
Do Espressif Modules Support Spotify Connect
43
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'ed
43
Struction). Exception was Unhandled. How to Resolve such Issue
43
Can ESP-DSP Fft Run 4096, 8192 and more Samples
44
How to Connect a Microphone with ESP32
44
Does ESP32 Support Analog Audio Output or Digital Audio Output
44
What Audio Formats Does the ESP32 Chip Support
44
How to Use the ESP32 Chip to Decode Compressed Audio
44
Where Is the Code Example for ESP-LED-Strip
44
Does ESP32 Support Online Voice Recognition
44
BLE Mesh Development Framework
44
What Is the Maximum Data Transmission Load for Bluetooth® le (BLE) Mesh
45
Could You Provide an Example of Networking through ESP32 BLE-Mesh? What APP Can be Used for BLE-Mesh Networking
45
For Unprovisioned Device in BLE-MESH, the Default Name Is ESP-BLE-MESH, How to Modify this Name
45
How Many Node Devices Can Esp32'S BLE-MESH Application Connect to
45
How Can I Manually Reset a BLE Mesh Device Without the Mobile Provisioning App or Provisioning Device
45
Can Wi-Fi be Used with ESP-NOW at the same Time
52
How Do I Set the Rate at Which ESP-NOW Data Is Sent
52
ESP-NOW Allows Pairing with a Maximum of 20 Devices. Is There a Way to Control more Devices
52
What Is the Maximum Number of Devices that Can be Controlled by ESP-NOW
52
Do I Need to Connect a Router for Communication between ESP-NOW Devices
53
Why Does ESP-NOW Limit the Data Length of each Packet to 250 Bytes? Can It be Configured
53
What Should I Pay Attention to When Using ESP-NOW Applications
53
How Can I Reduce Power Consumption When Using ESP-NOW
53
In Addition to Wireless Communication through ESP-NOW, Is There any Other Better Way to Realize One-To-One and One-To-Many Communication
53
Do ESP-NOW Applications Support Sending Packets over each Wi-Fi Channel
54
Are There any Special Procedures Required if I Intend to Use ESP-NOW for Commercial
54
Rameters Including CSMA/CA, Modulation Method, and Bit Rate
54
I Tested the Application Esp-Idf/Examples/Wifi/Espnow Using ESP32. Does It Only Support Connecting to 7 Encrypted Devices at the Maximum
54
ESP Rainmaker Cloud Service
54
Ios Application
54
Third Party Cloud Service
54
Are There any Examples for OTA Upgrading
54
Does ESP Azure Library Support Azure Iot Central? Is There an Example
55
What Should I Do to Connect ESP32 to Alibaba Cloud Via ESP32 + Ethernet + MQTT
55
What Do Alexa LED States Indicate
55
ESP-WIFI-MESH Development Framework
55
What Is the Maximum Data Transmission Load for Wi-Fi Mesh
55
Does Esp32'S Wi-Fi Mesh Supports no Router Self-Networking
55
What Is the Maximum Number of Node Layers Allowed When ESP32 Uses Wi-Fi Mesh
55
When Using an ESP32 Development Board to Test the Esp
56
The Router, the Device Name in Connection Is "Espressif". How to Modify this Name
56
Can Wi-Fi Mesh Send Messages to Specific Nodes Via TCP Server
56
During the Operation of the ESP32 Wi-Fi Mesh Network, if the Root Node Is Lost, What Events will the System Report Back
56
But the Server DID Not Receive any Data. How to Transfer Data from Leaf Nodes to External Servers
56
How Do I Upgrade My ESP-MESH Device Via OTA after Networking
56
Can You Provide ESP-MESH Light Reference Design
56
What Is the Default Mode for ESP-MESH Nodes Without any Configuration
57
ESP-MESH Starts with AP+STA Mode Enabled, Can the Phone Search for Aps
57
Do I Need to Rescan for All the Newly Added Devices When the Original Device Has Already Been Networked
57
When Using an ESP32 as a Master Device to Synchronize Time for Multiple Slave Devices, Can the Time Error be Less than 2 Ms
57
How Do I Get the Type of the Node in ESP-MESH
57
Is There any Demo of ESP-Mesh Root Node Sending Messages to a Service Via Ethernet
57
Does the Esp-Mesh-Lite Solution Support the Applications Without Routers
57
When Esp-Wifi-Mesh Is Already Networked, Does the Root or Node Device Can also Enable Wi-Fi Scan to Scan Surrounding Available AP Information
58
How Can I Switch to a New Router for Networking When Using the Esp-Wifi-Mesh Router Solution
58
Software Framework
60
Bluetooth le & Bluetooth
60
When Porting Example Gatt_Server, an Error Occurred Indicating Head File Does Not Exist
60
What Could be the Reasons
60
Does ESP32 Support Bluetooth 5.0
60
After the Bluetooth® le Starts Advertising, Why some Mobile Phones Cannot Successfully Scan Them
60
Can I Process OTA through Bluetooth® on ESP32
61
How Do ESP32 Bluetooth® and Bluetooth® le Dual-Mode Coexist and How Can I Use this Coexistence Mode
61
What Is the Throughput of ESP32 Bluetooth® le
61
Does ESP32 Support Bluetooth® 4.2 DLE (Data Length Extension)
61
How Do ESP32 Bluetooth® and Wi-Fi Coexist
61
How Can I Get ESP32 Bluetooth® Compatibility Test Report
61
What Is the Transmit Power of ESP32 Bluetooth
62
Could ESP32 Realize Bridging between Wi-Fi and Bluetooth® le
62
What Is the Operating Current of ESP32 Bluetooth® le
62
What Kinds of Bluetooth® le Profiles Does ESP32 Support
62
How Do I Connect Mobile Phones and Play Music Using ESP32 Bluetooth
62
How Is the ESP32 SPP Performance
62
What Is the Maximum Transmission Rate for ESP32 Bluetooth® le
63
How Does ESP32 Bluetooth® le Enter Light-Sleep Mode
63
Are There any Documentation References for ESP32 Blufi Networking
63
What Is the Maximum Transmission Rate for ESP32 Classic Bluetooth® SPP
63
Is ESP32 Bluetooth® Compatible to Bluetooth® Ver2.1 + EDR Protocol
64
How Many Bluetooth® Clients Can be Connected to ESP32
64
How Can I Get the MAC Address of Bluetooth® Devices for ESP32
64
What Is the Default Bluetooth® Transmit Power for ESP32 SDK
64
Is It Possible to Use Wi-Fi Smartconfig and Bluetooth® le Mesh for ESP32 Simultaneously
64
What Is the Operating Current for ESP32 Classic Bluetooth
64
How Can I Modify the Transmit Power for ESP32 Bluetooth
65
How Is the Networking Compatibility of ESP32 Bluetooth® LE? Is It Open-Sourced
65
When I Execute Example Bt_Spp_Acceptor on ESP32, the IOS Device Cannot Find the ESP32 Device During Scanning. What Could be the Reasons
65
How Is the Security of ESP32 Bluetooth® Le/Bluetooth® Secure Simple Pairing (SSP)
65
Compared to Legacy Pairing
65
How Can I Confirm the MTU Size of ESP32 Bluetooth® le
65
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 Issue
65
Does ESP32 Bluetooth® le Support Client-Server Mode, in Which Gatt Server and Gatt Client Can Coexist
66
What Are the Risks if There Are over Six Devices Connected to ESP32 Bluetooth® le
66
When Using ESP32 Device as the Server of Bluetooth® LE, How Many Client Devices Can
66
Be Connected
66
How Can I Send Files Via Bluetooth® BR/EDR for ESP32
66
When I Download Example ESP_SPP_SERVER for ESP32, How Can I Modify the Name
66
Of the Bluetooth® Device
66
When I Use the "Blufi"Example to Configure Network for ESP32, the Wi-Fi Cannot be
67
The Application. What Is the Reason
67
How Can I Specify a BLE Connection/Transmit Operation to Run on Core 0 When I Use ESP32
67
When I Set Name for the Bluetooth of an ESP32 Device Using Chinese Characters, Messy Code Shows Instead. What Is the Reason
67
In One Packet, or Are There Other Solutions to Increase the Transmission Rate
67
What Profile Does Esp32'S Classic Bluetooth® Support
68
How Many Stable Connections Can be Reached for ESP32-C3'S Bluetooth® le (BLE)
68
How Can I Adjust the BLE Advertising Interval
68
How Can I Input the PIN Code Via Mobile Phone During ESP32' S Classic Bluetooth Pairing
68
How Much Memory Does ESP32 Bluetooth Occupy
68
When I Use the "Gattc_Gatts_Coex.C"Example on ESP32 to Test BLE Multi-Connection
69
Menuconfig to Five. What Is the Reason
69
Does ESP32-C3 BLE Support Master and Slave Mode at the same Time? What Is the Number
69
Of Connections in Master Mode and Slave Mode
69
What Is the Maximum MTU Size of ESP32 Classic Bluetooth
69
How Can I Resolve the Frequently Occurred Elxxx Error (such as Elx200) When Wi-Fi and
69
Ble Co-Exit
69
How Does BLE Capture Packets
69
When I Use an ESP32 Development Board to Test Several Versions of Bluefi Example under
70
ESP-IDF for Networking, the Following Error Kept Printing. What Is the Reason
70
When I Use ESP32, Can Light-Sleep Mode be Enabled for Bluetooth and Can Bluetooth be
70
Kept Connected in Light-Sleep Mode
70
How Can I Modify the Bluetooth Device Name of ESP32
70
What Is the Maximum Supported Broadcast Length of BLE 5.0 Broadcast after It Is Set to Legacy Mode
71
How Can I Set a BLE Broadcast Package as Unconnectable Package
71
How Can I Send Bluetooth HCI Commands Directly to ESP32-WROOM-32D Module through the Serial Port
71
Does ESP32 Support Transmitting Audio Stream Using A2DP
71
How Many Devices Can be Connected at the most as Suggested by the White List of ESP32 Bluetooth le
71
Can ESP32 Bluetooth le Use PSRAM
71
When Using ESP32-C3 BLE Scan, Can I Set It to Only Scan the Long Range Devices
72
Is There a Limit to the Name Length of ESP32 as a Bluetooth Device
72
How Do I Set the ESP32 BLE Scan to the Permanent Scan Without Generating a Timeout
72
How Can I Get RSSI of BLE Devices through ESP32
72
How Can I Increase the Transmission Distance of BLE5.0? How Can I Set BLE5.0 to Long- Range Mode
72
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 Well
73
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 and
73
Gatt_Security_Server Examples
73
After Setting Gatt_Security_Server to ESP_IO_CAP_OUT Mode and Setting
73
However, the Two Development Boards Can Still be Connected. What Is the Reason
73
Does ESP32-C3/ESP32-C6/ESP32-S3 Support Bluetooth AOA/AOD
73
What Is the Maximum Length of Data in a BLE Advertising Packet Supported by ESP32-C3
74
With the BLE5.0 Feature
74
Does ESP32 Have any API to Check Whether BLE Advertising Has Started or Stopped
74
Ethernet
74
When Building an Example on ESP32 Ethernet Development Board, an Error Occurred as "Emac: Reset EMAC Timeout". What Could be the Reasons
74
When ESP32 Connected to LAN8720 Externally, with GPIO0 Providing CLK, the Initialization of Ethernet Example Failed. How to Resolve such Issue
74
When Using the Ethernet Example in ESP-IDF, an Error Occurred as "Timed out Waiting
75
Resolve such Issue
75
When Using ESP-IDF V4.1, How to Set the Static IP for ESP32 Ethernet
75
Is There any Impact on Ethernet Functionality if Replacing the Module of ESP32-Ethernet-Kit with ESP32-WROOM-32D
76
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 Reason
76
When Ethernet and Wi-Fi Co-Exist, Is Ethernet Prioritized to Transfer Data
77
Does ESP32 Ethernet Support MII Interface
77
Is It Possible to Connect ESP32-S2 to Ethernet Externally
77
Do the ESP32 Series Chips Support to Use EMAC and SPI-Ethernet Modules Simultaneously
77
Coexistence
77
When Wi-Fi Coexists with Bluetooth, What Mode Does It Support
77
When Wi-Fi Coexists with ESP-BLE-MESH, the Wi-Fi Throughput Is Low, Why
78
Does ESP32 Support Coexistence between ESP-WIFI-MESH and Bluetooth® le Mesh
78
Does ESP32 Support Coexistence between Bluetooth® and Wi-Fi
78
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 Issue
78
Can BLE Advertising (Connectable) and Ibeacon Sending (Advertising) Coexist
78
Peripherals
79
Analog-To-Digital Converter (ADC)
79
Digital-To-Analog Converter (DAC)
82
Gpio & Rtc Gpio
82
Inter-Integrated Circuit (I2C)
84
Inter-IC Sound (I2S)
85
Lcd
86
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
Timer
97
Touch Sensor
97
Two-Wire Automotive Interface (TWAI)
98
Universal Asynchronous Receiver/Transmitter (UART)
98
Usb
101
Other Peripherals
106
Protocols
107
Esp-Tls
107
Http
108
Lwip
109
Mbed TLS
116
Mqtt
117
Other Protocols
119
Provisioning
121
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
Security
121
Is the Firmware in ESP8266 Readable
121
Is It Possible to Encrypt Firmware for ESP8285
122
What Is the Difference between Secure Boot V1 and V2
122
After Enabling Secure Boot, There Is a Build Error Indicating Missing Files. What Could be the Reasons
122
After Enabling Secure Boot, Is It Possible for Modules to be Flashed Again
122
With Flash Encryption Enabled, a Module Reports an Error as Flash Read Error after Reflashed. How to Resolve such Issue
122
After Enabling Flash Encryption and Secure Boot for ESP32, How to Disable Them
123
Is There any Security Strategy for ESP32 to Protect Its Firmware
123
When ESP32 Debugging GDB after Enabling Flash Encryption, Why Does It Continuously Reset and Restart
123
How to Enable Flash Encryption for ESP32
123
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Espressif Systems ESP Specifications
General
Brand
Espressif Systems
Model
ESP
Category
Motherboard
Language
English
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