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The bit-bang implementation was replaced with the RMT implementation in
599b61c0.  This commit brings back that
bit-bang code, and allows it to be selected via the new static method:

    esp32.RMT.bitstream_channel(None)

The bit-bang implementation may be useful if the RMT needs to be used for
something else, or if bit-banging is more stable in certain applications.
Signed-off-by: Damien George <damien@micropython.org>

MicroPython currently runs on core 0 of the esp32.  Calling
rmt_driver_install will mean that the RMT interrupt handler is also
serviced on core 0.  This can lead to glitches in the RMT output if
WiFi is enabled (for esp32.RMT and machine.bitstream).

This patch calls rmt_driver_install on core 1, ensuring that the RMT
interrupt handler is serviced on core 1.  This prevents glitches.

Fixes issue #8161.
Signed-off-by: Damien George <damien@micropython.org>

The start keyword was removed in 18e48a71Signed-off-by: Damien George <damien@micropython.org>

And eliminate one build to reduce CI time.
Signed-off-by: Damien George <damien@micropython.org>

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

This fixes a bug introduced in 851ecb2dSigned-off-by: Damien George <damien@micropython.org>

This fixes a bug introduced in a76604afSigned-off-by: Damien George <damien@micropython.org>

For an extended state socket, if settimeout() is called before a NIC is
bound, save the timeout until the NIC is bound.

The main Makefile builds the mpy-cross executable automatically if
it doesn't exist since 78718fff,
so build it first to make sure it doesn't get needlessly rebuilt.

This board has only 2MiB of flash so the build needs to be reduced in size
to fit.  Commit 549448e8 made all boards
build with -O2 by default (for performance) so this overrides that default.
Signed-off-by: Damien George <damien@micropython.org>

This is needed because these ports allocate mbedtls data on the MicroPython
heap, and SSL socket objects must be fully cleaned up when they are garbage
collected, to free this memory allocated by mbedtls.  As part of this,
gc_sweep_all() will now ensure that the MP_STATE_PORT(mbedtls_memory)
linked-list is fully deallocated on soft reset.
Signed-off-by: Damien George <damien@micropython.org>

So a port can define it even if MICROPY_PY_USSL is not defined.
Signed-off-by: Damien George <damien@micropython.org>

Mainly useful for defining additional globals in boards and variants.

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

Output looks like this:

    >>> import platform
    >>> platform.libc_ver()
    ('newlib', '3.0.0')
    >>> platform.platform()
    'MicroPython-1.17.0-xtensa-IDFv4.2.2-with-newlib3.0.0'
    >>> platform.python_compiler()
    'GCC 8.4.0'
Signed-off-by: Damien George <damien@micropython.org>

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

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

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

Fixes build on MCUs with built-in USB HS PHY.
Signed-off-by: Damien George <damien@micropython.org>

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

- The wrong ACK is returned and checked.
- Send secondary DNS to google.

Updates the Zephyr port build instructions and CI to use the latest
Zephyr release tag.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>

CONFIG_USB was removed in Zephyr v2.7.0 after some Kconfig rework that
made it sufficient to use CONFIG_USB_DEVICE_STACK only.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>

Updates the Zephyr port to get the UART console device from devicetree
instead of Kconfig. The Kconfig option CONFIG_UART_CONSOLE_ON_DEV_NAME
was removed in Zephyr v2.7.0.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>

The reboot header was moved to a different path in Zephyr v2.6.0. The
old path was deprecated for two releases (v2.6.0 and v2.7.0) and will no
longer be supported after Zephyr v2.7.0.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>

As a prerequisite to upgrading to Zephyr v2.7.0, upgrade the minimum
CMake version required for the Zephyr port to 3.20.0.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>

As a prerequisite to upgrading to Zephyr v2.7.0, upgrade CI to use
Zephyr docker image v0.21.0. In particular, this is needed to pick up a
newer CMake version because Zephyr v2.7.0 increased the minimum CMake
version required to 3.20.0.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>

The duty is saved and set whenever the frequency is changed, unless the
duty rate was not set yet.

The top value was off by 1: in order to count n ticks it has to be set to
n-1.

Fixes issue #8122.

After changing the bitstream implementation to use the RMT driver in
commit 72d86158121e32bbabaeade08f449d507bf40f9a
("esp32/machine_bitstream.c: Replace with RMT-based driver."), using
multiple `Neopixel` instances shows signal duplication between the
instances (i.e. a `write()` on one instance is written to all instances).

On invocation, the rmt driver configures the GPIO matrix to route the
output signal to the respective GPIO pin.  When called for a different
`NeoPixel` instance using a different pin, the new route is established,
but the old route still exists.  Now, the RMT output signal is sent to both
pins.

Fix this by setting the standard GPIO output function for the current pin
after uninstalling the RMT driver.
Signed-off-by: Simon Baatz <gmbnomis@gmail.com>

- Add default values for I2S features added in ESP-IDF 4.4.
- Add workaround for bug introduced in ESP-IDF 4.4
  (https://github.com/espressif/esp-idf/issues/8121).

- Cleanup pyexec flags definitions so it's clear they are different.
- Use mp_uint_t for exec_flags because it should be unsigned.