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If Core Debug Level is at DEBUG, a confusing debug message will be emitted if the I2C transaction takes longer complete than the  calculated minimum time.  This original debug message was just to prove that this new i2c code could correctly handle SCL stretching or interrupt latency issues. This delay is not a problem, or an error.  Usually it is caused by a higher priory interrupt starving the i2c ISR.  Usually WiFi is the culprit.  As long of this delay is within the configured timeout (by default 50ms, or can be set with Wire.setTimeOut(milliseconds);) no problem will occur and the transaction will successfully complete.
Chuck.

* Add PSRAM init and malloc funtions

* Rebuild IDF libs

* added OTAWebUpdater

* added OTAWebUpdater

* Updated OTAWebUpdater

* Changed pinmap to show pins34-39 as GPI

* ArduinoOTA could have endless loop b/c udp.read can return negative result

* fix sdmmc config

* Fix warnings in EEPROM

from @Curclamas

* remove leftover TAG in EEPROM

* Initial add of @stickbreaker i2c

* Add log_n

* fix warnings when log is off

* i2c code clean up and reorganization

* add flags to interrupt allocator

* fix sdmmc config

* Fix warnings in EEPROM

from @Curclamas

* remove leftover TAG in EEPROM

* fix errors with latest IDF

* fix debug optimization (#1365)

incorrect optimization for debugging tick markers.

* Fix some missing BT header

* Change BTSerial log calls

* Update BLE lib

* Arduino-ESP32 release management scripted (#1515)

* Calculate an absolute path for a custom partitions table (#1452)

* * Arduino-ESP32 release management scripted
(ready-to-merge)

* * secure env for espressif/arduino-esp32

* * build tests enabled
* gitter webhook enabled

* * gitter room link fixed
* better comment

* * filepaths fixed

* BT Serial adjustments

* * don't run sketch builds & tests for tagged builds

* Return false from WiFi.hostByName() if hostname is not resolved

* Free BT Memory when BT is not used

* WIFI_MODE_NULL is not supported anymore

* Select some key examples to build with PlatformIO to save some time

* Update BLE lib

* Fixed BLE lib

* Major WiFi overhaul

- auto reconnect on connection loss now works
- moved to event groups
- some code clean up and procedure optimizations
- new methods to get a more elaborate system ststus

* Add cmake tests to travis

* Add initial AsyncUDP

* Add NetBIOS lib and fix CMake includes

* Add Initial WebServer

* Fix WebServer and examples

* travis not quiting on build fail

* Try different travis build

* Update IDF to aaf1239

* Fix WPS Example

* fix script permission and add some fail tests to sketch builder

* Add missing space in WiFiClient::write(Stream &stream)

Includes verification script (for Travis) that CMakeLists.txt contents match
repo & submodule source files

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

Added SPI bus pins and tested them as well

* add methods for getting TXTs.

* add methods for getting TXTs.

[OTA] Add UserSelectable timeout for invitation to device + check for OK result in the last few messages (#1445)

* Add submodule of Azure IoT library

* update the submodule of AzureIoT

Update commented pins so people do not get confused and try to use them

* Additional partition scheme min_spiffs
with minimal SPIFFS partition size and OTA support for bigger apps

* Selectable (from menu) partitions for m5stack

addition for m5stack (as is prepared for lolin32 board: https://github.com/espressif/arduino-esp32/pull/1379)

discourse here: https://github.com/espressif/arduino-esp32/issues/1378

* Selectable (from menu) partitions for MH ET LIVE boards
in reference to other boards (m5stack, lolin32)
this PR adds partition scheme selection for MH ET LIVE boards
also adds Core Debug Level selection for above boards

Added IIC pins. I can confirm that this is working!

* Add `SYSTEM_EVENT_WIFI_READY` call back once wifi service is init.  allows you to hook in, as the sdk does not generate this event for you.
As it stands the SDK does not appear to set `WIFI_MODE_NULL` correctly.  if the wifi is initialised and set to `WIFI_MODE_NULL` it actually defaults to AP mode.  This fix keeps `WIFI_MODE_NULL` within the ESP class if the wifi has not been init yet, and works in my testing.  albeit a one sided conversation.
https://github.com/espressif/arduino-esp32/issues/1306

* make changes compatible with new _persistent behaviour.

esp_timer_get_time returns monotonic time in microseconds, as a 64-bit
number. It can be called from tasks and interrupts, does not use any
critical sections/mutexes, and is thread safe.

The esp-idf expects duty values for the the sigma delta modulator in the range of -128 to 127
The arduino framework is supposed to use the range 0-255 thus the offset caclulation was wrong.