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Because DMA2 may be in use by other peripherals, eg SPI1.

On PYBD-SF6 it's possible to trigger a bug in the existing code by turning
on WLAN and connecting to an AP, pinging the IP address from a PC and
running the following code on the PYBD:

    def spi_test(s):
        while 1:
            s.write('test')
            s.read(4)

    spi_test(machine.SPI(1,100000000))

This will eventually fail with `OSError: [Errno 110] ETIMEDOUT` because
DMA2 was turned off by the CYW43 driver during the SPI1 transfer.

This commit fixes the bug by removing the code that explicitly disables
DMA2.  Instead DMA2 will be automatically disabled after an inactivity
timeout, see commit a96afae9Signed-off-by: Damien George <damien@micropython.org>

If a board specifies a filename via MICROPY_BOARD_FROZEN_BOOT_FILE then
that will be run on start up, before the usual boot.py.

The source code should stay 7-bit ASCII clean.
Signed-off-by: Damien George <damien@micropython.org>

Signed-off-by: Damien George <damien@micropython.org>

Quail (https://www.mikroe.com/quail, PID: MIKROE-1793) is based on an
STM32F427VI CPU, featuring 2048 kB of Flash memory and 192 kB of RAM.  An
on-board Cypress S25FL164K adds 8 MB of SPI Flash.

Quail has 4 mikroBUS(TM) sockets for Mikroe click(TM) board connectivity,
along with 24 screw terminals for connecting additional electronics and two
USB ports (one for programming, the other for external mass storage).

4 UARTs, 2 SPIs and 1 I2C bus are available for communication.
Signed-off-by: Lorenzo Cappelletti <lorenzo.cappelletti@gmail.com>

Signed-off-by: Lorenzo Cappelletti <lorenzo.cappelletti@gmail.com>

- Fix the BSSID byte order from scan and netinfo.
- Make sure ESSID from netinfo is null terminated.

Previously the use of `range(start,stop,step)` caused an allocation.
Replace with while loop.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Was incorrectly added as 7MB for an 8MB SPI flash, but this board has a
16MB chip, not 8MB, so it should be 15MB leaving 1MB for MicroPython.

Thanks to @robert-hh

Without the --block_count option the fuse will fail.
Signed-off-by: Damien George <damien@micropython.org>

Also add support for GPIO 47 and 48 on S3 boards.

The rp2.StateMachine.exec errors when supplying a sideset action.  This
commit passes the sideset_opt from the StateMachine though to the parser.
It also adds some value validation to the sideset operator.

Additionally, the "word" method is added to the exec to allow any other
unsupported opcodes.

Fixes issue #7924.

- mpconfigboard.h: flash and USART config
- mpconfigboard.mk: enable LFS1
- pins.c: define pins and LEDs
- pins.h: define structs and consts

- mpconfigboard.h: flash and USART config
- mpconfigboard.mk: enable LFS1
- pins.c: define pins and LEDs
- pins.h: define structs and consts

- mpconfigboard.h: flash and USART config
- mpconfigboard.mk: enable LFS1
- pins.c: define pins and LEDs
- pins.h: define structs and consts

- mpconfigboard.h: flash and USART config
- mpconfigboard.mk: enable LFS1
- pins.c: define pins and LEDs
- pins.h: define structs and consts

- mpconfigboard.h: flash and USART config
- mpconfigboard.mk: enable LFS1
- pins.c: define pins and LEDs
- pins.h: define structs and consts

The board specific #defines will be moved to individual boards.

- Makefile: update to use new ASF4 files, support frozen manifest, and
  include source files in upcoming commits
- boards/manifest.py: add files to freeze
- boards/samd51p19a.ld: add linker script for this MCU
- help.c: add custom help text
- main.c: execute _boot.py, boot.py and main.py on start-up
- modules/_boot.py: startup file to freeze
- modutime.c: add gmtime, localtime, mktime, time functions
- mpconfigport.h: enabled more features for sys and io and modules
- mphalport.h: add mp_hal_pin_xxx macros
- mphalport.c: add mp_hal_stdio_poll

Don't force the 'HAL' string to be part of the platform string because
it doesn't have a sensible meaning for all possible platforms, and
swap it with the PLATFORM_ARCH string so the strings which most platforms
have come first.

Following a similar change to the unix port in
6430cd3e

Although the pyboard has only 4 LEDs, there are some boards that (may) have
more.  This commit adds 2 more LEDs to the led.c file that if defined in
the board-specific config file will be compiled in.

This commit swaps the dimensions of the `framebuffer.FrameBuffer` in the
docs example from 10x100 to 100x10 pixels to avoid clipping.

This is done to better fit the subsequent example code, which writes
text of size 96x8 followed by a 96x1 horizontal line.

The y coordinate of the horizontal line is also adjusted such that it is
drawn inside of the new canvas bounds.

Used batch mode to get rid of the confirmation prompt on flashing.
Used 'compare-sections' to verify flash.
Removed the unnecessary `quit` at the end.

Expected result of const.py will be matched only when MICROPY_COMP_CONST is
enabled.  For easy understanding, added description at the first of the
test code.

Fixes issue #5882.

Some toolchains will have string.h defining various macros which can lead
to compile errors for string function implementations.  Not including
string.h fixes this.

An implementation of __memcpy_chk is provided for toolchains that enable
_FORTIFY_SOURCE.

Fixes issue #6046.
Signed-off-by: Alexey 'alexxy' Shvetsov <alexxyum@gmail.com>

Use getrandom function if available, otherwise read from /dev/urandom.

Signed-off-by: Henk.Vergonet@gmail.com