Adds support to the core for PIO-based, software-created UARTs, up to 8 (the number of PIO state machines) possible.
By using a custom program on the PIO state machines, it allows for very high bit rates and does not require CPU or interrupts.
Bit widths from 5- to 8-bits, 1 or 2 stop bits, and even/odd/none parity are supported.
* 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
Update pico-sdk to 1.1.2
Add methods to block the opposite core while doing flash updates.
Ensure opposite core is stopped in LittleFS and EEPROM while doing
flash updates.
Update documentation with new calls.
Support running code on the second core by adding a setup1() and/or
a loop1() routine to a sketch. These functions operate exactly like
the normal Arduino ones, and anything they call will be run on
the second core automatically.
Add a simple multicore example.
