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If SD card is present on (soft) reset then it's mounted on 1:/ and files
can be openned using, eg, open('1:/test.txt', 'r'), or 'w' for writing.

Using PendSV interrupt at lowest priority, code can now raise an
exception during an interrupt by calling pendsv_nlr_jump.  The exception
will be raised when all interrupts are finished.  This is used to trap
ctrl-C from the USB VCP to break out of running Python code.

To partly address Issue #220.

* Move RTC code from main to a separate module.

f2d and d2f functions from libgcc does not work correctly, most likely
due to the ABI being incorrect.  libgcc disabled for now.

mpconfigport.h is now included by stm32f4xx.h so that all STM files have
access to these defines.

Can now have null bytes in strings.  Can define ROM qstrs per port using
qstrdefsport.h

* Add the option to pass OSC frequency on command line.

CMSIS V3.01 -> V3.20. Now in stm/cmsis to keep separate from ST
libraries.

Thanks to Dave Hylands for this.

* Add simple ADC driver, with support for ADC1 and all channels.
* Export MicroPython ADC object with read_channel function.
* Add stm32f4xx_adc.c and adc.c to Makefile.

See pyb_usart_global_debug variable.

Also did some work on USB OTG, but nothing working yet.

* Add a DEBUG flag to Makefile, enables: "-O0 -ggdb"

Use make V=1e make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.

This should fix issue #117

While updating the teensy Makfile, I noticed that the stm Makefile
was using calling arm-none-eabi-objcopy and size rather than
$(OBJCOPY) and $(SIZE), so I added these 2 for consistency.

Updated mconfigport.h to enable GC

* Add a TARGET definition to Makefile (default PYBOARD).
* Add support for discovery LEDs in led module.
* Add support for discovery user switch in usersw
* Add EXTI interrupt handler for discovery user switch on (PA0).
* Parameterize led and usrsw modules pins and port.
* Issue #83

* Move user switch code from main.c into a separate module (usrsw)
* Add usrsw.c to Makefile

Now much more inline with how CPython does types.

So far, only start and stop integer indexes are supported. Step is
not supported, as well as objects of arbitrary types.

mpconfig.h will automatically pull mpconfigport.h.

import works for simple cases.  Still work to do on finding the right
script, and setting globals/locals correctly when running an imported
function.

* Chane dfu.py to use Python 3 syntax to avoid dependency on Python 2.
* Update Makefile to call python instead of python2
* Fix #33