arduino-esp32/README.md
Murat Ambarkutuk 151f275ed1 Add brief explanation about app_main() function when arduino used as a esp-idf component (#99)
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# Arduino core for ESP32 WiFi chip
## Need help or have a question? Join the chat at [![https://gitter.im/espressif/arduino-esp32](https://badges.gitter.im/espressif/arduino-esp32.svg)](https://gitter.im/espressif/arduino-esp32?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
- [Development Status](#development-status)
- [Installation Instructions](#installation-instructions):
+ [Using Arduino IDE](#using-through-arduino-ide)
+ [Windows](https://github.com/espressif/arduino-esp32/blob/master/doc/windows.md)
+ [Mac OS](#instructions-for-mac)
+ [Debian/Ubuntu](#instructions-for-debianubuntu-linux)
+ [Decoding Exceptions](#decoding-exceptions)
+ [Using PlatformIO](#using-platformio)
+ [Using as ESP-IDF component](#using-as-esp-idf-component)
- [ESP32Dev Board PINMAP](#esp32dev-board-pinmap)
## Development Status
Most of the framework is implemented. Most noticable is the missing analogWrite. While analogWrite is on it's way, there are a few other options that you can use:
- 16 channels [LEDC](https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/esp32-hal-ledc.h) which is PWM
- 8 channels [SigmaDelta](https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/esp32-hal-sigmadelta.h) which uses SigmaDelta modulation
- 2 channels [DAC](https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/esp32-hal-dac.h) which gives real analog output
## Installation Instructions
### Using through Arduino IDE
###[Instructions for Windows](doc/windows.md)
#### Instructions for Mac
- Install latest Arduino IDE from [arduino.cc](https://www.arduino.cc/en/Main/Software)
- Open Terminal and execute the following command (copy->paste and hit enter):
```bash
curl -o get-pip.py https://bootstrap.pypa.io/get-pip.py && \
sudo python get-pip.py && \
sudo pip install pyserial && \
mkdir -p ~/Documents/Arduino/hardware/espressif && \
cd ~/Documents/Arduino/hardware/espressif && \
git clone https://github.com/espressif/arduino-esp32.git esp32 && \
cd esp32/tools/ && \
python get.py
```
- Restart Arduino IDE
#### Instructions for Debian/Ubuntu Linux
- Install latest Arduino IDE from [arduino.cc](https://www.arduino.cc/en/Main/Software)
- Open Terminal and execute the following command (copy->paste and hit enter):
```bash
sudo usermod -a -G dialout $USER && \
sudo apt-get install git && \
wget https://bootstrap.pypa.io/get-pip.py && \
sudo python get-pip.py && \
sudo pip install pyserial && \
mkdir -p ~/Arduino/hardware/espressif && \
cd ~/Arduino/hardware/espressif && \
git clone https://github.com/espressif/arduino-esp32.git esp32 && \
cd esp32/tools/ && \
python get.py
```
- Restart Arduino IDE
#### Decoding exceptions
You can use [EspExceptionDecoder](https://github.com/me-no-dev/EspExceptionDecoder) to get meaningful call trace.
### Using PlatformIO
[PlatformIO](http://platformio.org) is an open source ecosystem for IoT
development with cross platform build system, library manager and full support
for Espressif ESP32 development. It works on the popular host OS: Mac OS X, Windows,
Linux 32/64, Linux ARM (like Raspberry Pi, BeagleBone, CubieBoard).
- [What is PlatformIO?](http://docs.platformio.org/page/what-is-platformio.html)
- [PlatformIO IDE](http://platformio.org/platformio-ide)
- Quick Start with [PlatformIO IDE](http://docs.platformio.org/page/ide/atom.html#quick-start) or [PlatformIO Core](http://docs.platformio.org/page/core.html)
- [Integration with Cloud and Standalone IDEs](http://docs.platformio.org/page/ide.html) -
Cloud9, Codeanywehre, Eclipse Che (Codenvy), Atom, CLion, Eclipse, Emacs, NetBeans, Qt Creator, Sublime Text, VIM and Visual Studio
- [Project Examples](https://github.com/platformio/platform-espressif32/tree/develop/examples)
### Using as ESP-IDF component
- Download and install [esp-idf](https://github.com/espressif/esp-idf)
- Create blank idf project (from one of the examples)
- in the project folder, create a folder called components and clone this repository inside
```bash
mkdir -p components && \
cd components && \
git clone https://github.com/espressif/arduino-esp32.git arduino && \
cd .. && \
make menuconfig
```
- ```make menuconfig``` has some Arduino options
- "Autostart Arduino setup and loop on boot"
- If you enable this options, your main.cpp should be formated like any other sketch
```arduino
//file: main.cpp
#include "Arduino.h"
void setup(){
Serial.begin(115200);
}
void loop(){
Serial.println("loop");
delay(1000);
}
```
- Else you need to implement ```app_main()``` and call ```initArduino();``` in it.
Keep in mind that setup() and loop() will not be called in this case.
If you plan to base your code on examples provided in [esp-idf](https://github.com/espressif/esp-idf/tree/master/examples), please make sure move the app_main() function in main.cpp from the files in the example.
```arduino
//file: main.cpp
#include "Arduino.h"
extern "C" void app_main()
{
initArduino();
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
//do your own thing
}
```
- "Disable mutex locks for HAL"
- If enabled, there will be no protection on the drivers from concurently accessing them from another thread/interrupt/core
- "Autoconnect WiFi on boot"
- If enabled, WiFi will start with the last known configuration
- Else it will wait for WiFi.begin
- ```make flash monitor``` will build, upload and open serial monitor to your board
## ESP32Dev Board PINMAP
![Pin Functions](doc/esp32_pinmap.png)