arduino as a ESP-IDF component

[Buffalchill]

Hardware:

Board: ESP32 Dev Module
Core Installation/update date: ?
IDE name: Msys32 ESP-IDF
Flash Frequency: 40Mhz
Upload Speed: 115200

#include <Arduino.h>

void setup() {
}

void loop() {
}

Description:

I need to use the Arduino as an ESP-IDF component. I followed the instructions Arduino-as-an-idf-component
then in make menuconfig i changed the sdkconfig => "Autostart Arduino setup and loop on boot" .
during make flash i got this this error at the end of building the project :

undefined reference to Setup() and undefined reference to Loop()

Can you please tell me what went wrong and how to fix this?
Regards.

[lbernstone]

Fixing it is easy. Don't tick that box. What that option does is compile <arduino-esp32>/cores/esp32/main.cpp into your project. If you look at that file, it includes an app_main, and references setup() and loop(), which is what Arduino wants.

[Buffalchill]

Thank you!

After some time i got it running now...

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "Arduino.h"

#if CONFIG_AUTOSTART_ARDUINO

#if CONFIG_FREERTOS_UNICORE
#define ARDUINO_RUNNING_CORE 0
#else
#define ARDUINO_RUNNING_CORE 1
#endif

void loopTask(void *pvParameters)
{
    setup();
    for(;;) {
        micros(); //update overflow
        loop();
    }
}

void app_main()
{
    initArduino();
    xTaskCreatePinnedToCore(loopTask, "loopTask", 8192, NULL, 1, NULL, ARDUINO_RUNNING_CORE);
}

#endif

void setup(){
	//Serial.begin(115200);
	pinMode(4, OUTPUT);
}

void loop(){
	//Serial.println("Hello World");
	digitalWrite(4, HIGH);
	delay(1000);
	digitalWrite(4, LOW);
	delay(1000);
} 

But one problem that i still have: I get compiler Error messages when I use Serial.begin() or Serial.print()
Is it possible to use the complete Arduino sketch with all its functions and librarys in the ESP-IDF ?
If yes, how ?

Regards

[lbernstone]

In the future, please post the errors so that I don't have to guess what the compiler is choking on. I will assume it is function/symbol not defined errors. Arduino IDE does a lot of magic for you finding libraries. You will need a lot more includes to do get everything you need.

[Buffalchill]

C:/msys32/home/esp/hello_world/main/hello_world_main.c:31:2: error: 'Serial' undeclared (first use in this function)
Serial.begin(115200);

[HKGK]

@Buffalchill I am seeing the same issue. How did you resolve?

[QuadCorei8085]

I'm having similar issue. Checked out ESP-IDF v3.1 I get this error:
hello_world/components/arduino/cores/esp32/esp32-hal-time.c:16:28: fatal error: lwip/apps/sntp.h: No such file or directory

When using the v3.0 tag:
make[1]: execvp: xtensa-esp32-elf-gcc: Argument list too long make[1]: *** [/d/esp32/esp-idf/make/component_wrapper.mk:274: cores/esp32/libb64/cencode.o] Error 127

[QuadCorei8085]

fixed by #1853

[Cylindric]

Just to add some data, I too am having this problem. I have a simple "main.cpp".
My esp-ldf repo is pulled as of right now, bd90f534fb1cdf7d4406767f9067398d51a12305
My arduino-esp32 is also current, 85032b2

In menuconfig I have enabled the Arduino setup and loop processing.
My sdkconfig and build output are at https://gist.github.com/Cylindric/080a8f4b852574b66bda1f11f578be25

/home/mark/AquaHub/Firmware/AquaHub/build/arduino/libarduino.a(main.o):(.literal._Z8loopTaskPv+0x0): undefined reference to `setup()'
/home/mark/AquaHub/Firmware/AquaHub/build/arduino/libarduino.a(main.o):(.literal._Z8loopTaskPv+0x4): undefined reference to `loop()'
/home/mark/AquaHub/Firmware/AquaHub/build/arduino/libarduino.a(main.o): In function `loopTask(void*)':
/home/mark/AquaHub/Firmware/AquaHub/components/arduino/cores/esp32/main.cpp:15: undefined reference to `setup()'
/home/mark/AquaHub/Firmware/AquaHub/components/arduino/cores/esp32/main.cpp:17: undefined reference to `loop()'
collect2: error: ld returned 1 exit status
make: *** [/home/mark/AquaHub/Firmware/AquaHub/build/aquahub.elf] Error 1

`

If I turn off the setup() and loop() processing, and instead define it manually in my own app_main(), I get a similar error but complaining about an undefined reference to app_main instead.

[Cylindric]

In case it matters, my source file is called main.cpp

[QuadCorei8085]

I'm using arduino as component. I followed the guide and it worked.
0) if using windows download the msys package from the esp docs site (zip file) and add the idf_path setup script under etc/profile.d/ (path is given by step 1))

1. check out the esp-idf, not a released branch but the master. I used the currently latest hash, that is: 822de0d038fd273a731ce9ce76addadfc16c1761 dated to 25th nov 9:14:14
2. place arduino under "components"
3. if you wish to use loop and setup like functions configure your sdk using 'make menuconfig'
   4+) all the rest settings can be done using menuconfig

[Cylindric]

Oddly enough, that's what I've been trying. Do you have your project in git or somewhere I could see it? There must be something different about what the people with problems are trying and what you've done.

I'll try your version, not sure where you got the "latest" as being 25th November from, there have been loads of commits since then. I'll try 822de.

[Cylindric]

Oh, 822de is the latest, from 25th October. Have tried now on MSYS, WSL and Ubuntu with the same result. If it's working for everyone else, it must be something about my code. No idea what it could be though, as it compiles fine in the Arduino IDE.

Okay, something weird is going on. I just started from scratch in a clean vm to see what I might have done wrong, and I've noticed that whatever I name my main.cpp is irrelevant. It's like it's not adding my own files to the build.

[QuadCorei8085]

In ESP-IDF you have to have a "main" folder where you have your file(s).
That has to contain a "component.mk".
Above that folder level (project root) you have to have the makefile and the sdkconfig (without .h - that is generated during build time).

[Cylindric]

Aah, I didn't know that. I grabbed the one from the hello-world example.

So for future reference, I now have:

Root
├── Makefile
├── sdkconfig
├── components
│   └── arduino
├── main
    ├── component.mk
    ├── main.cpp

[QuadCorei8085]

Yes this is explained in the guide: https://github.com/espressif/arduino-esp32/blob/master/docs/esp-idf_component.md