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General information about the WiPy
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==================================
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WLAN default behaviour
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----------------------
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When the WiPy boots with the default factory configuration starts in Access Point
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mode with ``ssid: wipy-wlan`` and ``key: www.wipy.io``.
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Connect to this network and the WiPy will be reachable at ``192.168.1.1``. In order
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to gain access to the interactive prompt, open a telnet session to that IP address on
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the default port (23). You will be asked for credentials:
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``login: micro`` ``password: python``
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Local file system and SD card
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-----------------------------
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There is a small internal file system (a drive) on the WiPy, called ``/flash``,
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which is stored within the external serial flash memory. If a micro SD card
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is hooked-up and enabled, it is available as ``/sd``.
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When the WiPy boots up, it always boots from the ``boot.py`` located in the
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``/flash`` file system. If during the boot process the SD card is enabled and
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it's selected as the current drive then the WiPy will try to execute ``main.py``
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that should be located in the SD card.
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The file system is accessible via the native FTP server running in the WiPy.
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Open your FTP client of choice and connect to:
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``ftp://192.168.1.1`` ``user: micro`` ``password: python``
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Boot modes
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----------
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If you power up normally, or press the reset button, the WiPy will boot
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into standard mode; the ``boot.py`` file will be executed first, then
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``main.py`` will run.
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You can override this boot sequence by pulling ``GPIO28`` **up** (connect
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it to the 3v3 output pin) during reset. This procedure also allows going
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back in time to old firmware versions. The WiPy can hold up to 3 different
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firmware versions, which are: the factory firmware plus 2 user updates.
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After reset, if ``GPIO28`` is held high, the heart beat LED will start flashing
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slowly, if after 3 seconds the pin is still being held high, the LED will start
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blinking a bit faster and the WiPy will select the previous user update to boot.
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If the previous user update is the desired firmware image, ``GPIO28`` must be
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released before 3 more seconds elapse. If 3 seconds later the pin is still high,
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the factory firmware will be selected, the LED will flash quickly for 1.5 seconds
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and the WiPy will proceed to boot. The firmware selection mechanism is as follows:
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**Safe Boot Pin** ``GPIO28`` **released during:**
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+-------------------------+-------------------------+----------------------------+
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| 1st 3 secs window | 2nd 3 secs window | Final 1.5 secs window |
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+=========================+=========================+============================+
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| | Normal boot, *latest* | | Safe boot, *previous* | | Safe boot, the *factory* |
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| | firmware is selected | | user update selected | | firmware is selected |
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+-------------------------+-------------------------+----------------------------+
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When selecting a previous firmware version, safe boot mode is entered, meaning
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that the execution of both ``boot.py`` and ``main.py`` is skipped. This is
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useful to recover from crash situations caused by the user scripts.
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The heart beat LED
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------------------
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By default the heart beat LED flashes once every 5s to signal that the system is
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alive. This can be overridden through the HeartBeat class:
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``pyb.HeartBeat().disable()``
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There are currently 2 kinds of errors that you might see:
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1. If the heart beat LED flashes quickly, then a Python script(eg ``main.py``)
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has an error. Use the REPL to debug it.
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2. If the heart beat LED stays on, then there was a hard fault, you cannot
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recover from this, the only way out is by pressing the reset switch.
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