Wally Harwood asked 3 months ago
I am using platformio 3,4,4
I did the migration from version 2 to version 3 and made appropriate changes. The modified program compiled and ran fine yesterday. Now there is a problem with ledcAttach .
When doing a build I now get :
=============================================
Compiling .pio\build\esp32doit-devkit-v1\libb6f\WiFi\WiFiAP.cpp.o
src/main.cpp: In function ‘void setup()’:
src/main.cpp:262:3: error: ‘ledcAttach’ was not declared in this scope
ledcAttach(ledPin1, freq, resolution);
^~~~~~~~~~
src/main.cpp:262:3: note: suggested alternative: ‘ledcAttachPin’
ledcAttach(ledPin1, freq, resolution);
^~~~~~~~~~
ledcAttachPin
*** [.pio\build\esp32doit-devkit-v1\src\main.cpp.o] Error 1
===============================
The suggested alternative is exactly what I have used.
Is something else being changed?
Sara Santos Staff answered 3 months ago
Hi.
What does your platformio.ini file look like?
Regards,
Sara
Wally Harwood answered 3 months ago
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
framework = arduino
monitor_speed = 115200
lib_deps =
ESP Async WebServer
arduino-libraries/Arduino_JSON @ 0.1.0
adafruit/Adafruit BME280 Library @ ^2.1.0
adafruit/Adafruit Unified Sensor @ ^1.1.4
QMC5883LCompass.h
mprograms/QMC5883LCompass@^1.2.3
board_build.filesystem = littlefs
; platform_packages added to enable ledc
;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
++++++++++++++++++++++++++++
Platform packages are residual from previous method of getting ledc to work with version 2. They are commented out.
Sara Santos Staff answered 3 months ago
Hi.
Platformio doesn’t support arduino core version 3.
You need to use the old ledc functions supported by core 2.
1. Attach the pin using ledcAttachPin()
ledcAttachPin(ledPin1, channel);
ledPin1 → GPIO pin
channel → LEDC channel (0-15)
2. Set up the LEDC PWM channel using ledcSetup()
ledcSetup(channel, freq, resolution);
channel → LEDC channel (same as in ledcAttachPin)
freq → Frequency in Hz
resolution → Bit resolution (1-16 bits)
3. Write duty cycle using ledcWrite()
ledcWrite(channel, duty);
ledcWrite(channel, duty);
duty → PWM duty cycle
I hope this helps.
ALTERNATIVELY, you can use the pioarduino fork: https://github.com/pioarduino/platform-espressif32
You can see the usage instructions here: https://github.com/pioarduino/platform-espressif32?tab=readme-ov-file#usage
Let me know if you can solve the issue.
Regards,
Sara