Espressif 32

Configuration:platform = espressif32

Espressif Systems is a privately held fabless semiconductor company. They provide wireless communications and Wi-Fi chips which are widely used in mobile devices and the Internet of Things applications.

For more detailed information please visit vendor site.

Configuration

CPU Frequency

See board_build.f_cpu option from “platformio.ini” (Project Configuration File)

[env:myenv]
; set frequency to 160MHz
board_build.f_cpu = 160000000L

FLASH Frequency

Please use board_build.f_flash option from “platformio.ini” (Project Configuration File) to change a value. Possible values:

  • 40000000L (default)
  • 80000000L
[env:myenv]
; set frequency to 80MHz
board_build.f_flash = 80000000L

FLASH Mode

Flash chip interface mode. This parameter is stored in the binary image header, along with the flash size and flash frequency. The ROM bootloader in the ESP chip uses the value of these parameters in order to know how to talk to the flash chip.

Please use board_build.flash_mode option from “platformio.ini” (Project Configuration File) to change a value. Possible values:

  • qio
  • qout
  • dio
  • dout
[env:myenv]
board_build.flash_mode = qio

External RAM (PSRAM)

You can enable external RAM using the next extra build_flags in “platformio.ini” (Project Configuration File) depending on a framework type.

Framework Arduino:

[env:myenv]
platform = espressif32
framework = arduino
board = ...
build_flags =
    -DBOARD_HAS_PSRAM
    -mfix-esp32-psram-cache-issue

Framework ESP-IDF:

[env:myenv]
platform = espressif32
framework = espidf
board = ...
build_flags =
    -DCONFIG_SPIRAM_CACHE_WORKAROUND

More details are located in the official ESP-IDF documentation - Support for external RAM.

Debug Level

Please use one of the next build_flags to change debug level. A build_flags option could be used only the one time per build environment. If you need to specify more flags, please separate them with a new line or space.

Actual information is available in Arduino for ESP32 Board Manifest. Please scroll to esp32.menu.DebugLevel section.

[env:myenv]
platform = ...
board = ...
framework = arduino

;;;;; Possible options ;;;;;;

; None
build_flags = -DCORE_DEBUG_LEVEL=0

; Error
build_flags = -DCORE_DEBUG_LEVEL=1

; Warn
build_flags = -DCORE_DEBUG_LEVEL=2

; Info
build_flags = -DCORE_DEBUG_LEVEL=3

; Debug
build_flags = -DCORE_DEBUG_LEVEL=4

; Verbose
build_flags = -DCORE_DEBUG_LEVEL=5

Upload Speed

You can set custom upload speed using upload_speed option from “platformio.ini” (Project Configuration File)

[env:myenv]
upload_speed = 9600

Erase Flash

Please platformio run --target the next command to erase the entire flash chip (all data replaced with 0xFF bytes):

> platformio run --target erase

# or short version

> pio run -t erase

Enable C++ exceptions

Please add -D PIO_FRAMEWORK_ESP_IDF_ENABLE_EXCEPTIONS to build_flags of “platformio.ini” (Project Configuration File) to enable C++ exceptions for ESP-IDF.

See project example.

Partition Tables

You can create a custom partitions table (CSV) following ESP32 Partition Tables documentation. PlatformIO uses default partition tables depending on a framework type:

To override default table please use board_build.partitions option in “platformio.ini” (Project Configuration File).

Warning

SPIFFS partition MUST have configured “Type” as “data” and “SubType” as “spiffs”. For example, spiffs, data, spiffs, 0x291000, 1M,

Examples:

; 1) A "partitions_custom.csv" in the root of project directory
[env:custom_table]
board_build.partitions = partitions_custom.csv

; 2) Switch between built-in tables
; https://github.com/espressif/arduino-esp32/tree/master/tools/partitions
; https://github.com/espressif/esp-idf/tree/master/components/partition_table
[env:custom_builtin_table]
board_build.partitions = no_ota.csv

Embedding Binary Data

Sometimes you have a file with some binary or text data that you’d like to make available to your program - but you don’t want to reformat the file as C source.

There are two options board_build.embed_txtfiles and board_build.embed_files which can be used for embedding data. The only difference is that files specified in board_build.embed_txtfiles option are null-terminated in the final binary.

[env:myenv]
platform = espressif32
board = ...
board_build.embed_txtfiles =
  src/private.pem.key
  src/certificate.pem.crt
  src/aws-root-ca.pem

The file’s contents will be added to the .rodata section in flash, and are available via symbol names as follows:

extern const uint8_t aws_root_ca_pem_start[] asm("_binary_src_aws_root_ca_pem_start");
extern const uint8_t aws_root_ca_pem_end[] asm("_binary_src_aws_root_ca_pem_end");
extern const uint8_t certificate_pem_crt_start[] asm("_binary_src_certificate_pem_crt_start");
extern const uint8_t certificate_pem_crt_end[] asm("_binary_src_certificate_pem_crt_end");
extern const uint8_t private_pem_key_start[] asm("_binary_src_private_pem_key_start");
extern const uint8_t private_pem_key_end[] asm("_binary_src_private_pem_key_end");

The names are generated from the full name of the file. Characters /, ., etc. are replaced with underscores. The _binary + _nested_folder prefix in the symbol name is added by “objcopy” and is the same for both text and binary files.

See full example with embedding Amazon AWS certificates:

ULP coprocessor programming

If you want to take measurements using ADC, internal temperature sensor or external I2C sensors, while the main processors are in deep sleep mode you need to use ULP coprocessor. At the moment ULP can be used only with the framework ESP-IDF.

First of all, to use ULP in your project you need to make sure that it is enabled in your sdkconfig.h configuration file. The next two lines must be added:

#define CONFIG_ULP_COPROC_ENABLED 1
#define CONFIG_ULP_COPROC_RESERVE_MEM 1024

Usually CONFIG_ULP_COPROC_RESERVE_MEM is already defined in the default sdkconfig.h with value 0. You can modify this value to meet your requirements.

Secondly, all ULP code, usually written in assembly in files with .S extension, must be placed into a separate directory with the name ulp in the root folder of your project. So your project structure should look like this:

project_dir
├── include
├── lib
│   └── README
├── test
├── src
│    ├── main.c
│    └── sdkconfig.h
├── ulp
│    └── ulp_code.S
└── platformio.ini

See full examples with ULP coprocessor programming:

More details are located in the official ESP-IDF documentation - ULP coprocessor programming.

Uploading files to file system SPIFFS

  1. Create new project using PlatformIO IDE or initialize project using PlatformIO Core (CLI) and platformio init (if you have not initialized it yet)
  2. Create data folder (it should be on the same level as src folder) and put files here. Also, you can specify own location for data_dir
  3. Run “Upload File System image” task in PlatformIO IDE or use PlatformIO Core (CLI) and platformio run --target command with uploadfs target.

To upload SPIFFS image using OTA update please specify upload_port / --upload-port as IP address or mDNS host name (ending with the *.local).

Examples:

Over-the-Air (OTA) update

Using built-in Local solution

Demo code for:

There are 2 options:

platformio run --target upload --upload-port IP_ADDRESS_HERE or mDNS_NAME.local

You also need to set upload_protocol to espota.

[env:myenv]
upload_protocol = espota
upload_port = IP_ADDRESS_HERE or mDNS_NAME.local

For example,

  • platformio run -t upload --upload-port 192.168.0.255
  • platformio run -t upload --upload-port myesp8266.local
Authentication and upload options

You can pass additional options/flags to OTA uploader using upload_flags option in “platformio.ini” (Project Configuration File)

[env:myenv]
upload_protocol = espota
; each flag in a new line
upload_flags =
    --port=3232

Available flags

  • --port=ESP_PORT ESP32 OTA Port. Default 8266
  • --auth=AUTH Set authentication password
  • --spiffs Use this option to transmit a SPIFFS image and do not flash the module

For the full list with available options please run

~/.platformio/packages/tool-espotapy/espota.py -h

Usage: espota.py [options]

Transmit image over the air to the esp32 module with OTA support.

Options:
  -h, --help            show this help message and exit

  Destination:
    -i ESP_IP, --ip=ESP_IP
                        ESP32 IP Address.
    -p ESP_PORT, --port=ESP_PORT
                        ESP32 ota Port. Default 8266

  Authentication:
    -a AUTH, --auth=AUTH
                        Set authentication password.

  Image:
    -f FILE, --file=FILE
                        Image file.
    -s, --spiffs        Use this option to transmit a SPIFFS image and do not
                        flash the module.

  Output:
    -d, --debug         Show debug output. And override loglevel with debug.
    -r, --progress      Show progress output. Does not work for ArduinoIDE

Warning

For windows users. To manage OTA check the ESP wifi network profile isn’t checked on public be sure it’s on private mode``

Using Arduino Framework with Staging version

PlatformIO will install the latest Arduino Core for ESP32 from https://github.com/espressif/arduino-esp32. The Git should be installed in a system. To update Arduino Core to the latest revision, please open PlatformIO IDE and navigate to PIO Home > Platforms > Updates.

  1. Please install PlatformIO IDE

  2. Initialize a new project, open “platformio.ini” (Project Configuration File) and set platform to https://github.com/platformio/platform-espressif32.git#feature/stage. For example,

    [env:esp32dev]
platform = https://github.com/platformio/platform-espressif32.git#feature/stage
board = esp32dev
framework = arduino

  3. Try to build project

  4. If you see build errors, then try to build this project using the same stage with Arduino IDE

  5. If it works with Arduino IDE but doesn’t work with PlatformIO, then please file new issue with attached information:

    • test project/files
    • detailed log of build process from Arduino IDE (please copy it from console to https://hastebin.com)
    • detailed log of build process from PlatformIO Build System (please copy it from console to https://hastebin.com)

Debugging

PIO Unified Debugger - “1-click” solution for debugging with a zero configuration.

Pinout Diagram

JTAG Wiring Connections

Board Pin JTAG Tool Pin
IO13 TCK
IO12 TDI
IO15 TDO
IO14 TMS
EN RST
GND GND
../_images/espressif32_debug_pinout.jpg

Tools & Debug Probes

Supported debugging tools are listed in “Debug” column. For more detailed information, please scroll table by horizontal. You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

Warning

You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions.

On-Board Debug Tools

Boards listed below have on-board debug probe and ARE READY for debugging! You do not need to use/buy external debug probe.

Name MCU Frequency Flash RAM
Espressif ESP-WROVER-KIT ESP32 240MHz 4MB 320KB

External Debug Tools

Boards listed below are compatible with PIO Unified Debugger but DEPEND ON external debug probe. They ARE NOT READY for debugging. Please click on board name for the further details.

Name MCU Frequency Flash RAM
AI Thinker ESP32-CAM ESP32 240MHz 4MB 320KB
ALKS ESP32 ESP32 240MHz 4MB 320KB
Adafruit ESP32 Feather ESP32 240MHz 4MB 320KB
D-duino-32 ESP32 240MHz 4MB 320KB
DOIT ESP32 DEVKIT V1 ESP32 240MHz 4MB 320KB
Dongsen Tech Pocket 32 ESP32 240MHz 4MB 320KB
ESP32 FM DevKit ESP32 240MHz 4MB 320KB
ESP32vn IoT Uno ESP32 240MHz 4MB 320KB
ESPectro32 ESP32 240MHz 4MB 320KB
ESPino32 ESP32 240MHz 4MB 320KB
Espressif ESP32 Dev Module ESP32 240MHz 4MB 320KB
FireBeetle-ESP32 ESP32 240MHz 4MB 320KB
Frog Board ESP32 ESP32 240MHz 4MB 320KB
Heltec WiFi LoRa 32 ESP32 240MHz 4MB 320KB
Heltec WiFi LoRa 32 (V2) ESP32 240MHz 8MB 320KB
Heltec Wireless Stick ESP32 240MHz 8MB 320KB
Hornbill ESP32 Dev ESP32 240MHz 4MB 320KB
Hornbill ESP32 Minima ESP32 240MHz 4MB 320KB
IoTaaP Magnolia ESP32 240MHz 4MB 320KB
MH ET LIVE ESP32DevKIT ESP32 240MHz 4MB 320KB
MH ET LIVE ESP32MiniKit ESP32 240MHz 4MB 320KB
Node32s ESP32 240MHz 4MB 320KB
NodeMCU-32S ESP32 240MHz 4MB 320KB
OLIMEX ESP32-DevKit-LiPo ESP32 240MHz 4MB 320KB
OLIMEX ESP32-EVB ESP32 240MHz 4MB 320KB
OLIMEX ESP32-GATEWAY ESP32 240MHz 4MB 320KB
Pycom LoPy ESP32 240MHz 4MB 320KB
Pycom LoPy4 ESP32 240MHz 4MB 1.25MB
Silicognition wESP32 ESP32 240MHz 4MB 320KB
SparkFun ESP32 Thing ESP32 240MHz 4MB 320KB
SparkFun LoRa Gateway 1-Channel ESP32 240MHz 4MB 320KB
TTGO LoRa32-OLED V1 ESP32 240MHz 4MB 320KB
TTGO T-Beam ESP32 240MHz 4MB 1.25MB
TTGO T1 ESP32 240MHz 4MB 320KB
VintLabs ESP32 Devkit ESP32 240MHz 4MB 320KB
WEMOS LOLIN D32 ESP32 240MHz 4MB 320KB
WEMOS LOLIN D32 PRO ESP32 240MHz 4MB 320KB
WEMOS LOLIN32 ESP32 240MHz 4MB 320KB
WeMos D1 MINI ESP32 ESP32 240MHz 4MB 320KB
WeMos WiFi and Bluetooth Battery ESP32 240MHz 4MB 320KB
XinaBox CW02 ESP32 240MHz 4MB 320KB
oddWires IoT-Bus Io ESP32 240MHz 4MB 320KB
oddWires IoT-Bus Proteus ESP32 240MHz 4MB 320KB

Stable and upstream versions

You can switch between stable releases of Espressif 32 development platform and the latest upstream version using platform option in “platformio.ini” (Project Configuration File) as described below.

Stable

; Latest stable version
[env:latest_stable]
platform = espressif32
board = ...

; Custom stable version
[env:custom_stable]
platform = [email protected]
board = ...

Upstream

[env:upstream_develop]
platform = https://github.com/platformio/platform-espressif32.git
board = ...

Packages

Name Description
framework-arduinoespressif32 Arduino Wiring-based Framework (ESP32 Core)
framework-espidf Espressif IoT Development Framework
framework-pumbaa Pumbaa Framework
framework-simba Simba Framework
tool-esptoolpy ESP8266 and ESP32 serial bootloader utility
tool-mkspiffs Tool to build and unpack SPIFFS images
tool-openocd-esp32 OpenOCD for Espressif 32
toolchain-esp32ulp Binutils fork with support for the ESP32 ULP co-processor
toolchain-xtensa32 xtensa32-gcc

Warning

Linux Users:

Windows Users:

Please check that you have a correctly installed USB driver from board manufacturer

Frameworks

Name Description
Arduino Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences.
ESP-IDF Espressif IoT Development Framework. Official development framework for ESP32.
Pumbaa Pumbaa is Python on top of Simba. The implementation is a port of MicroPython, designed for embedded devices with limited amount of RAM and code memory.
Simba Simba is an RTOS and build framework. It aims to make embedded programming easy and portable.

Boards

Note

AI Thinker

Name Debug MCU Frequency Flash RAM
AI Thinker ESP32-CAM External ESP32 240MHz 4MB 320KB

Adafruit

Name Debug MCU Frequency Flash RAM
Adafruit ESP32 Feather External ESP32 240MHz 4MB 320KB

Aiyarafun

Name Debug MCU Frequency Flash RAM
Node32s External ESP32 240MHz 4MB 320KB

April Brother

Name Debug MCU Frequency Flash RAM
April Brother ESPea32 No ESP32 240MHz 4MB 320KB

BPI Tech

Name Debug MCU Frequency Flash RAM
BPI-Bit No ESP32 160MHz 4MB 320KB

DFRobot

Name Debug MCU Frequency Flash RAM
FireBeetle-ESP32 External ESP32 240MHz 4MB 320KB

DOIT

Name Debug MCU Frequency Flash RAM
DOIT ESP32 DEVKIT V1 External ESP32 240MHz 4MB 320KB

DSTIKE

Name Debug MCU Frequency Flash RAM
D-duino-32 External ESP32 240MHz 4MB 320KB

Dongsen Technology

Name Debug MCU Frequency Flash RAM
Dongsen Tech Pocket 32 External ESP32 240MHz 4MB 320KB

DycodeX

Name Debug MCU Frequency Flash RAM
ESPectro32 External ESP32 240MHz 4MB 320KB

ESP32vn

Name Debug MCU Frequency Flash RAM
ESP32vn IoT Uno External ESP32 240MHz 4MB 320KB

Electronic SweetPeas

Name Debug MCU Frequency Flash RAM
Electronic SweetPeas ESP320 No ESP32 240MHz 4MB 320KB

Espressif

Name Debug MCU Frequency Flash RAM
ESP32 Pico Kit No ESP32 240MHz 4MB 320KB
Espressif ESP-WROVER-KIT On-board ESP32 240MHz 4MB 320KB
Espressif ESP32 Dev Module External ESP32 240MHz 4MB 320KB

Fred

Name Debug MCU Frequency Flash RAM
Frog Board ESP32 External ESP32 240MHz 4MB 320KB

Hardkernel

Name Debug MCU Frequency Flash RAM
ODROID-GO No ESP32 240MHz 16MB 320KB

Heltec Automation

Name Debug MCU Frequency Flash RAM
Heltec WiFi Kit 32 No ESP32 240MHz 4MB 320KB
Heltec WiFi LoRa 32 External ESP32 240MHz 4MB 320KB
Heltec WiFi LoRa 32 (V2) External ESP32 240MHz 8MB 320KB
Heltec Wireless Stick External ESP32 240MHz 8MB 320KB

Hornbill

Name Debug MCU Frequency Flash RAM
Hornbill ESP32 Dev External ESP32 240MHz 4MB 320KB
Hornbill ESP32 Minima External ESP32 240MHz 4MB 320KB

IntoRobot

Name Debug MCU Frequency Flash RAM
IntoRobot Fig No ESP32 240MHz 4MB 320KB

M5Stack

Name Debug MCU Frequency Flash RAM
M5Stack Core ESP32 No ESP32 240MHz 4MB 320KB
M5Stack FIRE No ESP32 240MHz 16MB 6.25MB
M5Stack GREY ESP32 No ESP32 240MHz 16MB 520KB
M5Stick-C No ESP32 240MHz 4MB 320KB

MH-ET Live

Name Debug MCU Frequency Flash RAM
MH ET LIVE ESP32DevKIT External ESP32 240MHz 4MB 320KB
MH ET LIVE ESP32MiniKit External ESP32 240MHz 4MB 320KB

MVT Solutions

Name Debug MCU Frequency Flash RAM
IoTaaP Magnolia External ESP32 240MHz 4MB 320KB

Magicblocks.io

Name Debug MCU Frequency Flash RAM
MagicBit No ESP32 240MHz 4MB 320KB

MakerAsia

Name Debug MCU Frequency Flash RAM
MakerAsia Nano32 No ESP32 240MHz 4MB 320KB

Microduino

Name Debug MCU Frequency Flash RAM
Microduino Core ESP32 No ESP32 240MHz 4MB 320KB

NodeMCU

Name Debug MCU Frequency Flash RAM
NodeMCU-32S External ESP32 240MHz 4MB 320KB

Noduino

Name Debug MCU Frequency Flash RAM
Noduino Quantum No ESP32 240MHz 16MB 320KB

OLIMEX

Name Debug MCU Frequency Flash RAM
OLIMEX ESP32-DevKit-LiPo External ESP32 240MHz 4MB 320KB
OLIMEX ESP32-EVB External ESP32 240MHz 4MB 320KB
OLIMEX ESP32-GATEWAY External ESP32 240MHz 4MB 320KB
OLIMEX ESP32-PRO No ESP32 240MHz 4MB 320KB
OLIMEX ESP32-PoE No ESP32 240MHz 4MB 320KB
OLIMEX ESP32-PoE-ISO No ESP32 240MHz 4MB 320KB

OROCA

Name Debug MCU Frequency Flash RAM
OROCA EduBot No ESP32 240MHz 4MB 320KB

Onehorse

Name Debug MCU Frequency Flash RAM
Onehorse ESP32 Dev Module No ESP32 240MHz 4MB 320KB

Pycom Ltd.

Name Debug MCU Frequency Flash RAM
Pycom GPy No ESP32 240MHz 4MB 320KB
Pycom LoPy External ESP32 240MHz 4MB 320KB
Pycom LoPy4 External ESP32 240MHz 4MB 1.25MB

RoboticsBrno

Name Debug MCU Frequency Flash RAM
ALKS ESP32 External ESP32 240MHz 4MB 320KB

Silicognition

Name Debug MCU Frequency Flash RAM
Silicognition wESP32 External ESP32 240MHz 4MB 320KB

SparkFun

Name Debug MCU Frequency Flash RAM
SparkFun LoRa Gateway 1-Channel External ESP32 240MHz 4MB 320KB

SparkFun Electronics

Name Debug MCU Frequency Flash RAM
SparkFun ESP32 Thing External ESP32 240MHz 4MB 320KB

TTGO

Name Debug MCU Frequency Flash RAM
TTGO LoRa32-OLED V1 External ESP32 240MHz 4MB 320KB
TTGO T-Beam External ESP32 240MHz 4MB 1.25MB
TTGO T-Watch No ESP32 240MHz 16MB 320KB
TTGO T1 External ESP32 240MHz 4MB 320KB

ThaiEasyElec

Name Debug MCU Frequency Flash RAM
ESPino32 External ESP32 240MHz 4MB 320KB

TinyPICO

Name Debug MCU Frequency Flash RAM
TinyPICO No ESP32 240MHz 4MB 320KB

Turta

Name Debug MCU Frequency Flash RAM
Turta IoT Node No ESP32 240MHz 4MB 320KB

Unknown

Name Debug MCU Frequency Flash RAM
ESP32 FM DevKit External ESP32 240MHz 4MB 320KB

VintLabs

Name Debug MCU Frequency Flash RAM
VintLabs ESP32 Devkit External ESP32 240MHz 4MB 320KB

WEMOS

Name Debug MCU Frequency Flash RAM
WEMOS LOLIN D32 External ESP32 240MHz 4MB 320KB
WEMOS LOLIN D32 PRO External ESP32 240MHz 4MB 320KB
WEMOS LOLIN32 External ESP32 240MHz 4MB 320KB
WeMos D1 MINI ESP32 External ESP32 240MHz 4MB 320KB
WeMos WiFi and Bluetooth Battery External ESP32 240MHz 4MB 320KB

Widora

Name Debug MCU Frequency Flash RAM
Widora AIR No ESP32 240MHz 16MB 320KB

XinaBox

Name Debug MCU Frequency Flash RAM
XinaBox CW02 External ESP32 240MHz 4MB 320KB

oddWires

Name Debug MCU Frequency Flash RAM
oddWires IoT-Bus Io External ESP32 240MHz 4MB 320KB
oddWires IoT-Bus Proteus External ESP32 240MHz 4MB 320KB

u-blox

Name Debug MCU Frequency Flash RAM
u-blox NINA-W10 series No ESP32 240MHz 2MB 320KB