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ESP32 Web Server – Arduino IDE won't build using VSC – 'ledcAttachChannel' was not declared in this scope

Q&A Forum › Category: ESP32 › ESP32 Web Server – Arduino IDE won't build using VSC – 'ledcAttachChannel' was not declared in this scope
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Steve Gale asked 5 months ago

Hi,
If I follow the above tutorial and use the Arduino IDE the project builds.
 
However, I am trying to do everything using VSC because I use ESP devices, raspbery PI and PICO.
When I try and build the project in VSC I get the error
‘ledcAttachChannel’ was not declared in this scope
Looking on the internet one fix is to use
‘ledcAttach’ instead.
However, this generates a similar error.
Could this be becuse I am using a later version of Arduino.h than the tutorial?
 
My platformio.ini file is

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
lib_deps = ESP Async WebServer
    arduino-libraries/Arduino_JSON @ 0.1.0
board_build.filesystem = littlefs

Before attemtping this tutorial I managed to build and run the littleFS example where a file is read and the data output to the serial monitor.
So I have some confidence in my Arduino set up.
 
cheers
 
Steve Gale

Question Tags:
5 Answers
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Sara Santos Staff answered 5 months ago

Hi.
You need to update your ESP32 boards in PlatformIO to use the latest version of the Arduino core, version 3.
Go to Home > Platforms, then click on the Updates tab at the top, and then update espressif32.
 
Let me know if this solves the issue.
Regards,
Sara

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Steve Gale answered 5 months ago

Hi,
Thanks for quick response.
Under platforms I do not have any options to update.
espressif32 is version 6.7
 
cheers
 
Steve

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Sara Santos Staff answered 5 months ago

Hi.
It seems that platformIO doesn’t update to the latest core automatically.
After searching and testing for a while I found out that you need to include the following on your paltformio.ini file so that it uses core 3.0

platform_packages=
  framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#3.0.1
  framework-arduinoespressif32-libs @ https://github.com/espressif/arduino-esp32/releases/download/3.0.1/esp32-arduino-libs-3.0.1.zip

This works for me.
Let me know if this solves your issue.

Regards,
Sara

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Steve Gale answered 5 months ago

That fixed it, brilliant, thanks for help.
 
You obviously know what to search for 🙂
 
Steve

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Sara Santos Staff answered 5 months ago

That’s great.
I’m glad it’s working.
I’ll mark this issue as resolved. If you need further help, you just need to open a new question in our forum.
Regards,
Sara