GitLab

This also fixes up the IRQ for the PYBOARD4 USERSW
although I was unable to test that functionality.

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.

* Detect VCP line state, based on SET_CONTROL_LINE_STATE request

* Add SD card test to fix warning

* Remove include mpconfigport.h from file.c

* Issue #232

* Add missing LCD definitions for STM32F4DISC target, current code
  breaks build.

To partly address Issue #220.

This reverts commit a215b09c.

* Move gc_collect from main to py/gc.c
* Define GC's memory boundaries in linker script
* Issue #220

* Fix PCGCCTL bug using address instead of value.
* Fix issue #211

* Move RTC code from main to a separate module.

* Add MICROPY_HW_HAS_LCD
* Add MICROPY_HW_HAS_WLAN
* Use feature test macros in main

* Add some generic feature macros to mpconfigport
* Move pin and port definitions from usrsw.c to mpconfigport

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.