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Adding definitions for internal reset and mode pins for ESP8285.

Fixes #348

Add the RTC header path in the SDK to the Arduino build path.  Also add
pico_utils to the libpico.a for the datetime_to_str call.

Note that the pico_sdk has a bug in the datetime.h header so you need to
manually bracket the include file as "C":

extern "C" {
    #include "pico/util/datetime.h"
}

By default RTTI (Run-Time Type Information) is disabled because most apps
don't need run time type info enabled.  However, certain libraries expect
to be able to query types of objects at runtime, so add a menu to enable it.

In `pinMode()` I think it would be better to call `gpio_disable_pulls()` on the ulPin when ulMode == INPUT.
Adding `gpio_disable_pulls(RP_PIN);` after `pinMode(RP_PIN, INPUT);` solves the issue.

Fixes #312

* Add package.json

To make package easily integratable with PlatformIO

* Correct name back to original one

* Format package.json

* Add first shot at builder script

* Add USB stack flags, fix compile flags

* Formatting

* Add more link & USB flags

* Build Boot2 bootloader

* Formatting

* Generate linkerscript, linker fixes

* Fix linkflags, make firmware runnable

* Update USB flags and RAM size

* Correct USB flags, add dynamic sketch partitioning

* Restructure filesystem size and flash size logic into platform code

* Move C++ only flags to CXXFLAGS

* Add PlatformIO documentation

* Link to new platform.io document in the docs TOC

* Fix typos in platformio docs

* Fix one additional typo in platformio.rst

* Update docs

* Remove wrongly commited build folder

Reset the SDA and SCL pins to INPUT at Wire.end() to prevent multiple pins connected to I2C when changing pins (#302)

Fixes #289

Per #276, #277, #274 there seems to be an issue with interrupts and some
other low-level ARM operations when using the distributed libstdc++.

Use the default libstdc++ built with the toolchain, instead.

Fixes #277
Fixes #276
Fixes #274

* Adds support for Challenger RP2040 WiFi boards

* Added Challenger board to makeboards build script

* Adds new challenger board with LTE modem.

* Updated after getting approved PID from Raspberry Pi

Identify some spots that GCC's -fanalyzer noted might need nullptr
checks, and add them.

Use the existing Arduino Stream method of setTimeout to set the Wire
I2C timeout delay.

Fixes #260

When LittleFS.begin() or SDFS.begin() is called after the filesystem is
already mounted, don't unmount/remount.  When an unmount happens, all old
Files become invalid (but the core doesn't know this), so you would end
up with random crashes in FS code.

Now, check for _mounted, and if so just return immediately from begin().

you had "esrle" instead of "earle" in the GH URL :)

Wire::requestFrom() returns the number of bytes read from the slave.  In
the case of error, the slave can end up returning a very large integer
for PICO_GENERIC_ERROR which would then be used as the # of bytes read
causing crashes and errors.

Running TalkingToMyself without connecting the I2C ports would show
this behavior.

Now, when PICO_GENERIC_ERROR is returned, set the read-back buffer len
to 0 explicitly.