Update README.md

Add instructions for using as IDF component

Author: me-no-dev

README.md

@@ -6,10 +6,13 @@ Not everything is working yet, you can not get it through package manager, but y
 
 The framework can also be downloaded as component in an IDF project and be used like that.
 
-Things that "should" work:
+Things that work:
+
 - pinMode
 - digitalRead/digitalWrite
 - attachInterrupt/detachInterrupt
+- analogRead/touchRead/touchAttachInterrupt
+- ledcWrite/sdWrite/dacWrite
 - Serial (global Serial is attached to pins 1 and 3 by default, there are another 2 serials that you can attach to any pin)
 - SPI (global SPI is attached to VSPI pins by default and HSPI can be attached to any pins)
 - Wire (global Wire is attached to pins 21 and 22 by default and there is another I2C bus that you can attach to any pins)
@@ -56,4 +59,57 @@ You can try WiFiClient but you need to disconnect the client yourself to be sure
  ```
 - Restart Arduino IDE
 
+#### Instructions for 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
+ 
+ ```arduino
+ //file: main.cpp
+ #include "Arduino.h"
+ extern "C" void initArduino();
+ 
+ extern "C" void app_main()
+ {
+ initArduino();
+ pinMode(4, OUPUT);
+ 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
+
 ![Pin Functions](doc/esp32_pinmap.png)