https://github.com/kakopappa/how-to-make-a-precompiled-arduino-library-for-esp8266-esp32

How to make a precompiled Arduino library for esp8266 esp32
https://github.com/kakopappa/how-to-make-a-precompiled-arduino-library-for-esp8266-esp32

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How to make a precompiled Arduino library for esp8266 esp32

• Host: GitHub
• URL: https://github.com/kakopappa/how-to-make-a-precompiled-arduino-library-for-esp8266-esp32
• Owner: kakopappa
• Created: 2022-07-27T01:31:50.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2022-07-27T01:48:25.000Z (over 2 years ago)
• Last Synced: 2023-09-12T20:11:13.801Z (over 1 year ago)
• Language: C++
• Size: 6.84 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: ReadMe.md

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README

        
**Step 1:**

Create ```hello.cpp``` and ```hello.h``` and add the implementation. Example in the lib folder returns the sum of two integers

**Step 2:**

Make the archive file (.a) using ```xtensa-esp32-elf-gcc.exe``` for ESP32 and use ```xtensa-lx106-elf-gcc``` for ESP8266

For ESP32

```

xtensa-esp32-elf-gcc.exe -c hello.cpp -o libhello.o

xtensa-esp32-elf-ar.exe crf libhello.a libhello.o

```

Note: ```xtensa-esp32-elf-gcc.exe``` is located here if you have installed ESP32 in your arduino IDE. 

You may want to add this path to system env for easy access.

```

C:\Users\\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32s2-elf-gcc\gcc8_4_0-esp-2021r2-patch3\bin\

```

Now you should have a libhello.a in the path.

**Step 3:**

1. Make the library for Ardunio (arduino-helloworld-lib) and copy the header files (lib\hello.h) to library src folder (arduino-helloworld-lib\src). 

2. Copy the libhello.a to arduino-helloworld-lib\src\esp32 or arduino-helloworld-lib\src\esp8266 depending on which gcc you use to create the archive file.

**Step 4:**

Invoke the function from Ardunio sketch. example.ino

```

#include  // hello.h header from our library  (arduino-helloworld-lib)

#define BAUD_RATE  9600

void setup() {

   Serial.begin(BAUD_RATE);

  

}

void loop() {

  // put your main code here, to run repeatedly:

   int result = add(1, 1); // Invokes the add function in libhello.a 

   Serial.println(result);

   delay(1000);

}

```