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Addresses issue #1420.

On the first boot don't add the MAC address, this is to speed up
factory testing.

This bug was introduced when renaming '/sflash' to '/flash'.

The first safe boot level executes the latest firmware but skips
'main.py' and 'boot.py'.

Key is always entered as a string, but if security is WEP, the key
is converted automatically to hex before connecting or configuring
the device as an AP.

Changes are based on this post:
https://github.com/micropython/micropython/issues/876#issuecomment-115255551

The constructor can optionally take the same params of iwconfig in
order to configure WiFi when creating the object. Params are
keyworkd only. The WiPy accepts:

- mode (int -> WLAN.AP or WLAN.STA)
- ssdi (string)
- security (int -> WLAN.OPEN, WLAN.WEP, WLAN.WPA, WLAN.WPA2)
- key (string)
- channel (int (1-11))
- antenna (int -> WLAN.INTERNAL, WLAN.EXTERNAL)

- subprocess.check_output can only handle strings on windows, not bytes,
  so convert the arguments as such
- the pty module is for posix systems only so skip the tests needing it
  in case it is not available

This is more consistent and fixes run_micropython on windows as it uses
forward slahses to compare paths

This needs to land afte #1407 lands, since #1407 is where
the CMSIS_MCU was defined.

This causes unnecessary constants to no longer be generated.
Some constants (like UART_BRR) are different between the F4 and F7

Uses cmdline/repl_emacs_check.py to check for presence of emacs keys in
repl before doing full feature test.

See PR #1414.

This change allows micropython to return the same value as CPython for sys.platform

This file should be kept up to date with list of hal commits.

The DFU bootloader on the ST32F7 chip changes the clocksource
for various possible boot sources (UART1, UART3, I2C1-3).
This commit resets those clock sources back to their cold
reset values.

USB serial is now working for F7.

Internal file storage is now working for F7.  The flash is laid out a bit
differently to the F4 - 4 x 32K, 1 x 128K with the rest 256K, so the
internal storage is 96K.

Added more pind definitions for STM32F7DISC board.  Made USART1 be the
default HWUART repl.  The STLINK usb connector also looks like a USB
serial port which is attached to USART1 on the STM32F7DISC.

Thanks to Dave Hylands for the patch.

Thanks to Dave Hylands for the patch.

Thanks to Dave Hylands for the patch.

Capability is #if'd off by default.

Thanks to Dave Hylands for the patch.

Extracted GPIO clock enable logic into mp_hal_gpio_clock_enable
and called from anyplace which might need to use GPIO functions
on ports other than A-D.

Thanks to Dave Hylands for the patch.

Thanks to Dave Hylands for the patch.