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Provide direct connection from BT audio to I2S and PWM audio outputs.
Example included showing play/pause operation.

Adds a library to run classic Bluetooth A2DP source (output) audio from
the PicoW.  Simple example showing operation and callbacks.

Factor out multiple BT lock/unlock and place in the PicoW variant files.

Use -O2 only on the LWIP checksum routine, resulting in a speedup of
around 13% (checksumming only, not entire LWIP stack) for 72 add'l bytes
of flash.

Fixes #1730

Uses DMA operations to avoid the need to bit-bang or busy wait for I2C operations
that might be very slow.  Optional, adds new API calls to enable.  Simple example
included.

Fixes #1192

Uses DMA operations to avoid the need to bit-bang or busy wait for SPI
operations that might be very slow. Optional, adds new API calls to enable.
Simple example included.

Co-authored-by: Christian Halter <christian.halter@newsan.com.ar>

Fixes #2163

When a ping is sent from the Pico, a raw_recv callback is added which
sees all raw incoming packets to detect the response from the ping target.
If while waiting for the target response an external ping packet arrives
this incoming ping request packet will be processed by the
LwipIntfDev<>::_pingCB which will return "0" not processed and which
*should* not change the payload unless it handles the actual packet.

Unfortunately, the 20 byte header was unconditionally stripped off of
the packet before checking if this was our response, changing the
payload address and causing an assertion in LWIP.

Fix by using absolute offsets inside the raw packet for the ping
response checks.

Fixes #2156
Fixes #2149

As seen in debug of #2149, if the LwipIntfDev is already _started,
return false for a ::begin() call.

Also, protect netif_add/_remove on the very small possibilty of being
called by LwipIntfDev devices while the CYW43 driver is doing work.

Avoids crash seen in #2132

With example from the Arduino Ethernet library

If a file called `.ci.defines` is present in a directory, apply those
while building the specified sketch.

* Add an lwip_ESPHost test, like the wired Ethernet ones
* Add WINC1500 test and CI hook
* Remove 1 minor warning in WINC build

Add missing boards and WiFi types

Fixes #2136

Co-authored-by: Dominic Pearman <dominic@phymorous.de>

* functions to set PDM pins

* change pin set method to better match existing libs

Co-authored-by: Dominic Pearman <dominic@phymorous.de>

The lwipopts.h file started with the PicoW example one, but no longer
tracks it, so remove the EXAMPLE define guard.

Fixes #2123

Fixes #2037

Fixes #2105

W5100 doesn't support isLinked, so no change needed there.

Fixes #1870

Fixes #2033

Same pinout as the plain Pico, just different flash and # of GPIOs

Fixes #2054

Fix #2094

* Add FatFS for onboard flash use/sharing of FAT

* Move all to "fatfs" namespace

The FatFS library defines commonly used names like WORD which could conflict
with user code otherwise.

* Restyle

* FTL-based, wear-leveling FatFS with USB export

Allow using FAT filesystem with onboard flash in a safer, wear-leveled
way and to export the onboard flash to the host as a USB drive for easy
data transfer.

* Update documentation

* Fix submodule reference

* Don't spellehcek ChaN FatFS files

* Disable FTL debugging

* More codespell skips

* Move to latest SPIFTL library

* Allow using raw flash instead of FTL

* Remove unneeded static FIL 4k allocation

* Expose FAT FS format configuration options

* Update documentation

* Remove USB partial flash rewrites

* Remove unneeded dups of FatFS sources

Leave the LICENSE.md and README.md to point to upstream.

* Clean up comments