[Resolved] SoftwareSerial.cpp:41:10: fatal error: avr/interrupt.h: No such file or directory

1

Microsoft Windows 11 Version 22H2 (OS Build 22621.4249)
PlatformIO Core 6.1.16·Home 3.4.4 ( airm2m_core_esp32c3 board selected )
ESP32-C3-ZERO
Zadig 2.9 (Build 788)
FTDI driver CDM212364_Setup

I am using ESP32-C3 to compile for Arduino platform, and encountered error below.

Compiling .pio\build\airm2m_core_esp32c3\lib6b7\SoftwareSerial\SoftwareSerial.cpp.o
.pio/libdeps/airm2m_core_esp32c3/SoftwareSerial/SoftwareSerial.cpp:41:10: fatal error: avr/interrupt.h: No such file or directory
 #include <avr/interrupt.h>
          ^~~~~~~~~~~~~~~~~
compilation terminated.

The platformio.ini
[env:airm2m_core_esp32c3]
platform = espressif32
board = airm2m_core_esp32c3
framework = arduino
upload_port = \\.\COM16
upload_speed = 9600
upload_protocol = esptool
debug_tool = esp-prog
debug_init_break = tbreak setup
debug_speed = 1000
build_flags =
    -D ARDUINO_USB_MODE=1
    -D ARDUINO_USB_CDC_ON_BOOT=1
    -std=c++17
lib_ignore = FreeRTOS
lib_deps =
featherfly/SoftwareSerial@^1.0

Any help is greatly appreciated.

2

This doesn’t match together.
Your include statement is for AVR architecture.
Check the example from the featherlfy library

But why do you need a software serial on an ESP32-C3?
It has 2 hardware UART interfaces!

The first can be accessed via Serial0 (because you have ARDUINO_USB_CDC_ON_BOOT=1) and the second is Serial1.

GPIOs RX TX
Serial0 20 21
Serial1 18 19
3

hi,

“Your include statement is for AVR architecture.”

  • That’s strange to me too, as it is not from my code, it is from the SoftwareSerial itself and I saw this library supports “Espressif 32” as shown picture below highlighted.

image

“But why do you need a software serial on an ESP32-C3?”

  • To test the SoftwareSerial library by Arduino on ESP32, as using existing written code that is from ATmega328p.
4

Apologizing, just added EspSoftwareSerial by Dirk Kaar, now things running smoothly already. Thank you.