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* fix #913

Essentially, this reverts the algorithm used to satisfy #650 as it has proved erroneous on fast MCUs.

See https://github.com/TMRh20/nrf_to_nrf/issues/8

* typedef gpio pin numbers

* adjust docs for new datatype def

* reformat RF24.h; add missing semicolons

includes a follow up from
https://github.com/nRF24/RF24/commit/557d165c12e72329b7573b380eb1e7f132cfbfe6
in which a useless RF24::spi member was declared for RP2040 platform.

* add RF24_PIN_INVALID macro

This will fix RF24::isValid() and
prevents overflow from using the old 0xFFFF value in the RF24 overloaded c'tor that accepts no args.

It also helps to avoid "magic numbers" as was previously used.

* replace magic numbers to c'tor in examples

* avoid max pin val conflicting w/ RF24_PIN_INVALID

resolves #903

references to solutions in #892 and #899

a regression from #892 about
using the default instance of the SPI wrapping class for PicoSDK

* Removed 'static' keywords in SPI.h such that multiple SPI busses can be used to connect multiple Radios. Also added an example for this use-case
Co-authored-by: Brendan <2bndy5@gmail.com>

* minor docs tweaks
  - show Table of Contents in Doxygen's Main/Related Pages
  - update sphinx customized CSS and conf.py
* update doxygen config (requires v1.9.5+)
* move docs-related files into docs folder
* make all CI reusable workflow callers

* add printf support to ESP* and arduino-pico cores
* add ESP32/8266 boards to PlatformIO CI

   Arduino CLI seems to have trouble getting the esp* core that
   corresponds to the fqbn prefix

* make other pgm_read_* macros complaint with unified API

Corresponding to #864, this completes compliance with the unified ArduinoCore-API about 

- `pgm_read_word()`
- `pgm_read_byte()`

see https://github.com/arduino/ArduinoCore-API/blob/e26862e453c1234e1c23506d1839bfa68999d911/api/deprecated-avr-comp/avr/pgmspace.h#L102-L103

* add some boards to the Arduino & PIO CI

* run clang-format on changed files


fix param name

* install arduino-pico core in arduino CI

install cpp-linter from PyPI

keep installing AVR, megaAVR, MBED, SAM, & SAMD platforms in addition to arduino-pico

See https://github.com/nRF24/RF24Mesh/pull/210
To allow users to configure the PA level in higher layers of the stack, do not set PA level in radio.begin();.

Calling this macro caused the following error: 'const void*' is not a pointer-to-object type when defined by another library (in this instance ArduinoJSON)

see bblanchon/ArduinoJson/#1790

solves #867

Also amends an outdated comment in the definition.

This is needed to update the pyRF24 pkg to use latest master.

This does not affect RF24 lib builds because
RF24_NO_IRQ is respected in the root CMakeLists.txt.
But, the pyRF24 pkg doesn't actually use the root CMakeLists.txt.
Instead, the pyRF24 pkg only uses utility/CMakeLists.txt.

The RP2040, Pico SDK and the Pico documentation are all produced by Raspberry Pi ( https://www.raspberrypi.com/ ) and not by Raspberry Pi Foundation ( https://www.raspberrypi.org/ )

* all single line loops and conditions use curly brackets

also noticed a missing space in doc comment

* change clang-format config

* arduino CI runs on opening PR when lib src changes

* make sure sprintf_P is only defined for Linux

* declare sprintf_P for picoSDK

* use platform config to include stdio,not RF24.cpp

https://github.com/nRF24/RF24/issues/854

* Update streaming_data.py

* revise all py examples

* add scanner.py example

* show signal counts in scanner.py

* fix scanner.py

* finalize scanner.py

* change foreground color not BG

* better peak decay and countdown timer

* revert countdown timer effort

* fix peak calc in scanner.py

* add model variant info to printPrettyDetails()

* conform column about model variant

* add new isFifo() methods

* fix call to overloaded `isFifo()`

* fix copy-n-paste error

* add to py wrapper; remove const-ness from params

* fix casting in py wrapper

* ran clang-format on pyRF24.cpp

* update return type for writeAckPL() in py wrapper

* add new methods to sphinx docs

respects latest refactoring in sphinx-immaterial theme

* revert 1 line conditions, loops, & case labels

* avoid duplicate builds for reported boards

* missed a case label

* integrate clang-format

* ammend CI

* same format for all but arduino examples; force LF

* get delta size reports for only atmega328p, atsamd21, attinyx5 chips

* remove old astyle config

* using my fork of breathe

this fixes warning from pygments and weird multi-line function signatures (via CSS)

* use breathe latest

* remove doc'd return of void func

* fix some spelling mistakes in common_issues doc

* update CSS for sphinx-immaterial theme changes

* don't create PDFs on RTD

* reduce Doxyfile to only the options used

* adjust using_cmake.md

* update sphinx docs about theme updates

* improve doxygen CI

* remove typo/artifdact

* docs don't use graphviz or intersphinx

* add new auto-install steps to cmake doc

Continue to point to old installer file