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Fixes #609 and a niggling slowness in uploads.  Try to find the drive
in a loop for 10 seconds, instead of only checking once after 10 seconds.
Avoid 100% CPU usage while waiting for Pico drive

Depends on new toolchain from
https://github.com/earlephilhower/pico-quick-toolchain/pull/11

Fixes #251

Slight difference to generic RP2040
PIN_SERIAL2_TX + PIN_SERIAL2_RX are
switched with PIN_WIRE0_SDA + PIN_WIRE0_SCL

Add plumbing to allow `Wire`, `Serial1`, `SPI1` to map to the 2nd
hardware unit for devices where the PCB layout only brings out the
2nd port.

Fix the Seeedstudio XAIO pins

Fixes #594

- added WIZnet WizFi360-EVB-Pico
- added WIZnet W5500-EVB-Pico
- corrected WIZnet W5100S-EVB-Pico PID

Avoids returning 2^32 bytes in the case of a requestFrom read fails
due to timeout.

Fixed #601

Allows apps to provide a callback parameter in the `attachInterrupt` call
to be passed back to the function when the interrupt happens.

Co-authored-by: Arya11111 <xuepeng@dfrobot.com>

Fixes #593

When SerialPIO::end is called, stop the PIO SMs and potentially
disable the IRQ handler if this is the last RX port on that PIO.

Looks like only minor changes to the SDK, should not affect the core.

Fixes #585

On an I2C bus restart, call the onReceive callback and clear the buffer.

Thanks to @DWiskow for the debug and patch!

Remove pico-extras from makelibpico.sh
Remove refs to SPIFFS in FS.h
Remove travis::: markers
Update Arduino IDE URL

Co-authored-by: Arya11111 <xuepeng@dfrobot.com>

Fixes #578

Need to munge the platform.txt on release.

Fixes #576

Co-authored-by: Arya11111 <xuepeng@dfrobot.com>

Reverse the order of IRQ and idle restore to match the way
they were initiated.

Rewrite the I2S code from scratch to eliminate the dependence on the
pico-extras implementation and to support I2S input as well.

8-bit, 16-bit, 24-bit, and 32-bit words are supported.

Multiple I2S ports are allowed (theoretically up to 6 because
2 DMA channels are required per port).

I2S input and I2S output are supported.

Add input example

Fixes #535
Fixes #99
Fixes #562

Co-authored-by: Stephan Korner <stephan.korner@trihow.com>

Thanks to @StefanKellerAC !

The chip supports 133MHz and the other Pico core already defaults to
the higher speed, so make 133 the default.

It can still be changed through the menus and will stay at 125 unless
pre-existing users change it so they will see no difference.

To remove compiler warning the valid core macro was modified to only check
that the core passed in was < # of total cores.  Unfortunately there are
parts of the FreeRTOS code where the passed in core # is -1.  The upstream
catches this and returns FALSE, but my hacked version returned TRUE.  This
caused interesting memory corruption errors and crashes when the
current task block[-1] was updated.

Undo the change and fix the 1 spot where a warning happens instead.

Undo the forced compiler -O0 for port.c, it was only masking the fault.

Use low power WFE when idle.

Set PORT.C to built `-O0` always because it seems to occasinally end
up with interrupts disabled in task code, causing the SYSTICK never to
fire and killing task switching.

No need for dynamic exceptions.  We don't move the execbase.