* rmt driver initial version

* supporting conti mode plus interrupts

* using conitnous mode for sending more data

* working continous mode

* rmt driver cleanup after conti mode

* initial version of rmt driver

* adding a simple example

* adding channel and block locks

* modified of rmt interface for simpler/easier usage

* adding header sentinels, split interface to common and additional settings

* Fixes per code review + support for rx callback mode

* renamed internal structures and enums, fixed formatting

* cmake support for rmt

* refactored tx-conti interrupts to function to make it more readable

* added Tx and Rx examples

* added license headers

* minor updates per review

* used struct access, renamed defines, corrected diagram

* Initial

* Implementation

* Add to CMakelist.txt

* Add example

* Add IRAM_ATTR

* Add delay into example to allow print before sleep

* Changed to Serial.flush()

* Allow using argument with attachInterrupt

* formatting

replace tabs with spaces

* fix bug more then 1 interrupt

* leftover

* add example

* make attachInterruptArg public

* update example

* leftover

Added WiFi.disconnect to ESPNow examples. Fixes https://github.com/espressif/arduino-esp32/issues/1425 (#1511)

* Create ledcWrite_demo_ESP32_RGB.ino

adding the public domain example ledcWrite_demo_ESP32.ino to this repo.  Added RGB to the name for people searching, added some comments, and renames things to make a bit more sense.

* Update ledcWrite_demo_ESP32_RGB.ino

renamed to ledcWrite_RGB.ino and added a couple more comments based on https://github.com/espressif/arduino-esp32/issues/689

* Rename libraries/ESP32/examples/AnalogOut/ledcWrite_demo_ESP32_RGB/ledcWrite_demo_ESP32_RGB.ino to libraries/ESP32/examples/AnalogOut/ledcWrite_RGB/ledcWrite_RGB.ino

Renamed.

* Added ESPNow basic example

* fixed meta doc for slave

* refactored folder structure

* bug fixes

* Added Single Master Multi-Slave

* updated meta docs

* Added ESPNow basic example

* fixed meta doc for slave

* refactored folder structure

* Add initial SPIFFS library

* Fix Deep Sleep Examples

* Missed one example

*Added a Timer wakeup example
*Added a Touch wakeup example
*Added an external source wakeup example

Method:
--------
Added a verbose print method for ease.

Test Case:
-----------
Putting ESP32 to sleep will give a different reason on wake than the first
time power up.

* Create hall_effect_esp32.ino

A simple example to access the hall effect sensor in the esp32

* Create hall_effect.ino

* Update hall_effect.ino

Simple sketch to access the internal hall effect detector on the esp32

* Delete hall_effect_esp32.ino

* Create HallSensor.ino

* Update HallSensor.ino

* Update HallSensor.ino

* Delete hall_effect.ino

* Add ESP.getChipId() function to get ESP32's ChipID.

* change getChipId() to getEfuseMac()

Implement semaphore and mutex to safeguard the ISR.
This is the proper way to handle hardware Interrupts with FreeRTOS. The
more regular approach may/will lead to exceptions

* Added LEDC Fade exmaple

* Renamed LEDCFade example to LEDCSoftwareFade

Added valueMax parameter for ledcAnalogWrite

* Remove usage of LED_BUILTIN constant to solve CI errors

* Add Touchread example

* Rename libraries/ESP32/examples/Touch/TouchRead.ino to libraries/ESP32/examples/Touch/TouchRead/TouchRead.ino

* Update TouchRead.ino