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unconditionally schedule usb background after
background_callback_reset()
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* Better messaging when code is stopped by an auto-reload.
* Auto-reload works during sleeps on ESP32-S2. Ticks wake up the
main task each time.
* Made internal naming consistent. CamelCase Python names are NOT
separated by an underscore.
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Fixes #3787
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This changes lots of files to unify `board.h` across ports. It adds
`board_deinit` when CIRCUITPY_ALARM is set. `main.c` uses it to
deinit the board before deep sleeping (even when pretending.)
Deep sleep is now a two step process for the port. First, the
port should prepare to deep sleep based on the given alarms. It
should set alarms for both deep and pretend sleep. In particular,
the pretend versions should be set immediately so that we don't
miss an alarm as we shutdown. These alarms should also wake from
`port_idle_until_interrupt` which is used when pretending to deep
sleep.
Second, when real deep sleeping, `alarm_enter_deep_sleep` is called.
The port should set any alarms it didn't during prepare based on
data it saved internally during prepare.
ESP32-S2 sleep is a bit reorganized to locate more logic with
TimeAlarm. This will help it scale to more alarm types.
Fixes #3786
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Initial alarm and sleep PR: time alarms with light and deep sleep; PinAlarms not yet implemented
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This allows calls to `allocate_memory()` while the VM is running, it will then allocate from the GC heap (unless there is a suitable hole among the supervisor allocations), and when the VM exits and the GC heap is freed, the allocation will be moved to the bottom of the former GC heap and transformed into a proper supervisor allocation. Existing movable allocations will also be moved to defragment the supervisor heap and ensure that the next VM run gets as much memory as possible for the GC heap.
By itself this breaks terminalio because it violates the assumption that supervisor_display_move_memory() still has access to an undisturbed heap to copy the tilegrid from. It will work in many cases, but if you're unlucky you will get garbled terminal contents after exiting from the vm run that created the display. This will be fixed in the following commit, which is separate to simplify review.
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Fixes #3581.
Pins were marked as never_reset by common_hal_displayio_fourwire_construct() and common_hal_sharpdisplay_framebuffer_construct(), but these marks were never removed, so at the end of a session after displayio.release_displays(), {spi|i2c}_singleton would be set to NULL but the pins would not be reset. In the next session, board.SPI() and board.I2C() were unable to reconstruct the object because the pins were still in use.
For symmetry with creation of the singleton, add deinitialization before setting it to NULL in reset_board_busses(). This makes the pins resettable, so that reset_port(), moved behind it, then resets them.
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This reflects our belief that the API is stable enough to avoid incompatible changes during 6.x.
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Tested & working:
* Send standard packets
* Receive standard packets (1 FIFO, no filter)
Interoperation between SAM E54 Xplained running this tree and
MicroPython running on STM32F405 Feather with an external
transceiver was also tested.
Many other aspects of a full implementation are not yet present,
such as error detection and recovery.
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When configured the CircuitPython heap will be on the external RAM.
When not available, the heap will be 48k inside the IDF heap.
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Saleae for posterity
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ESP32-S2: Add Neopixel support
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The missing second "const" made these mutable arrays pointing to
const string data.
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This saves nearly 200 bytes. Curiously, it also saves RAM.
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